Publications

TitleAbstractYear
Filter
PMID(sorted descending)
Filter
optimisation of synthesis of oligosaccharides derived from lactulose (fructosyl-galacto-oligosaccharides) with β-galactosidases of different origin.batch synthesis of fructosyl-galacto-oligosaccharides from lactulose was performed with commercial β-galactosidase preparations from aspergillus oryzae, kluyveromyces lactis and bacillus circulans. the enzyme from a. oryzae produced the highest yield and specific productivity of synthesis, being selected for further studies. optimization of fructosyl-galacto-oligosaccharides synthesis was carried out using response surface methodology, considering temperature and initial sugar concentration as v ...201223497880
effects of a novel bacterial phytase expressed in aspergillus oryzae on digestibility of calcium and phosphorus in diets fed to weanling or growing pigs.in 2 experiments, 48 weanling (initial bw: 13.5 ± 2.4 kg, exp. 1) and 24 growing pigs (initial bw: 36.2 ± 4.0 kg, exp. 2) were used to determine effects of a novel bacterial 6-phytase expressed in aspergillus oryzae on the apparent total tract digestibility (attd) of phosphorus and calcium in corn-soybean meal diets fed to weanling and growing pigs. in exp. 1 and 2, pigs were randomly allotted to 6 dietary treatments using a randomized complete block design and a balanced 2 period changeover des ...201323497607
preparation of progenin iii from total steroidal saponins of dioscorea nipponica makino using a crude enzyme from aspergillus oryzae strain.progenin iii, one of the most active spirostanol saponins, is a potential candidate for anti-cancer therapy due to its strong antitumor activity and low hemolytic activity. however, the concentration of progenin iii is extremely low in natural dioscorea plants. in this paper, the progenin iii production from total steroidal saponins of dioscorea nipponica makino was studied using the crude enzyme from aspergillus oryzae dlfcc-38. the crude enzyme converting total steroidal saponins into progenin ...201323471779
protodioscin-glycosidase-1 hydrolyzing 26-o-β-d-glucoside and 3-o-(1 → 4)-α-l-rhamnoside of steroidal saponins from aspergillus oryzae.a novel protodioscin-(steroidal saponin)-glycoside hydrolase, named protodioscin-glycosidase-1 (pgase-1), was purified and characterized from the aspergillus oryzae strain. the molecular mass of this enzyme was determined to be about 55 kda based on sds-polyacrylamide gel electrophoresis. pgase-1 was able to hydrolyze the terminal 26-o-β-d-glucopyranoside of protodioscin (furostanoside) to produce dioscin (spirostanoside), and then further hydrolyze the terminal 3-o-(1 → 4)-α-l-rhamnopyranoside ...201323467827
breeding research on sake yeasts in japan: history, recent technological advances, and future perspectives.sake is an alcoholic beverage of japan, with a tradition lasting more than 1,300 years; it is produced from rice and water by fermenting with the koji mold aspergillus oryzae and sake yeast saccharomyces cerevisiae. breeding research on sake yeasts was originally developed in japan by incorporating microbiological and genetic research methodologies adopted in other scientific areas. since the advent of a genetic paradigm, isolation of yeast mutants has been a dominant approach for the breeding o ...201323464572
fuzzy logic control of rotating drum bioreactor for improved production of amylase and protease enzymes by aspergillus oryzae in solid-state fermentation.in this study, we compared the performance of two control systems, fuzzy logic control (flc) and conventional control (cc). the control systems were applied for controlling temperature and substrate moisture content in a solidstate fermentation for the biosynthesis of amylase and protease enzymes by aspergillus oryzae. the fermentation process was achieved in a 200 l rotating drum bioreactor. three factors affecting temperature and moisture content in the solid-state fermentation were considered ...201323462006
synthesis of novel 2-amino-4-(5'-substituted 2'-phenyl-1h-indol-3'-yl)-6-aryl-4h-pyran-3-carbonitrile derivatives as antimicrobial and antioxidant agents.as a part of systematic investigation of synthesis and biological activities of indole analogues linked to various heterocyclic systems, we have synthesized new compounds viz., 2-amino-4-(5'-substituted 2'-phenyl-1h-indol-3'-yl)-6-aryl-4h-pyran-3-carbonitriles (2a-i), 4,5-diamino-6-(5'-substituted 2'-phenyl-1h-indol-3'-yl)-8-aryl-2-oxo-2,6-dihydrodipyrano [2,3-b:3,2-e]pyridine-3-carbonitriles (3a-i), 4-amino-5-(5'-substituted 2'-phenyl-1h-indol-3-yl)-7-aryl-1h-pyrano[2,3-d]pyrimidin-2(5h)-ones ( ...201323454016
effect of heavy atoms on the thermal stability of α-amylase from aspergillus oryzae.currently, there are no versatile and established methods for improving stability of proteins. in an entirely different approach from conventional techniques such as mutagenesis, we attempted to enhance enzyme stability of α-amylase from aspergillus oryzae using a heavy-atom derivatization technique. we evaluated changes in stability using differential scanning calorimetry (dsc). candidate heavy atoms were identified using the heavy-atom database system hatodas, a web-based tool designed to assi ...201323451229
nad⁺-dependent xylitol dehydrogenase (xdha) and l-arabitol-4-dehydrogenase (lada) deletion mutants of aspergillus oryzae for improved xylitol production.xylitol dehydrogenase (xdha) and l-arabitol dehydrogenase (lada) are two key enzymes in xylan metabolism catalyzing the oxidation of xylitol to d-xylulose and arabitol to l-xylulose, respectively. in aspergillus oryzae, xdha and lada are encoded by xdha and lada. we deleted xdha and lada and xdha-lada to generate mutants with decreased dehydrogenase activities and increased xylitol production. the mutants were constructed by homologous transformation into a. oryzae p4 (∆pyrg) using pyrg as a sel ...201323436125
2-(benzothiazol-2-yl)-phenyl-β-d-galactopyranoside derivatives as fluorescent pigment dyeing substrates and their application for the assay of β-d-galactosidase activities.2-(benzothiazol-2-yl)-phenyl-β-d-galactopyranoside derivatives were synthesized as novel artificial fluorescent pigment dyeing substrates for β-d-galactosidase. the substrates, which exhibited non-fluorescence or weak fluorescence in solution phase, were smoothly hydrolyzed by β-d-galactosidase from aspergillus oryzae and yielded a water-insoluble strong fluorescent pigment. the difference of fluorescent intensity exhibited a linear relationship with the amount of enzyme.201323434417
hierarchical meso-macroporous silica grafted with glyoxyl groups: opportunities for covalent immobilization of enzymes.hierarchical meso-macroporous silica (average mesopore diameter 20 nm) was synthesized and chemically modified to be used as a support for the immobilization of lipases from candida antarctica b and alcaligenes sp. and β-galactosidases from bacillus circulans and aspergillus oryzae. catalytic activities and thermal stabilities of enzymes immobilized by multipoint covalent attachment in silica derivatized with glyoxyl groups were compared with those immobilized in glyoxyl-agarose, assessing bioca ...201323416689
occurrence of toxigenic aspergillus spp. and aflatoxins in selected food commodities of asian origin sourced in the west of scotland.the occurrence of aspergillus moulds and aflatoxins in 12 commercially-available dried foods of asian origin were examined. all food samples, except green beans and three types of dried fruit, contained multiple genera of moulds of which aspergillus (55%) was the most frequently detected. penicillium (15%), rhizopus (11%), mucor (3%), monascus (1%), eurotium (1%) and unidentified (14%) were also observed. the occurrence of aflatoxigenic moulds, however, did not correspond with the occurrence of ...201323416649
manr, a transcriptional regulator of the β-mannan utilization system, controls the cellulose utilization system in aspergillus oryzae.manr, a dna-binding protein possessing the zn(ii)(2)cys(6) binuclear cluster domain, acts as a positive regulator of mannanolytic enzyme genes in aspergillus oryzae. in this study, we found that manr controlled the expression not only of mannanolytic enzyme genes but also of cellulolytic enzyme genes in a. oryzae, based on dna microarray analysis of a manr-disruptant and a manr-overexpressing strain. a new model for the regulation of cellulase and hemicellulase genes mediated by manr and xlnr in ...201323391935
effect of a fermented brown rice extract on the gastrointestinal function in methotrexate-treated rats.we investigated the protective effect of a hydrous ethanol extract of brown rice fermented with aspergillus oryzae (erf) which contained nucleobases and low fiber on the methotrexate (mtx)-induced gastrointestinal damage in rats. the rats were assigned to three groups: control (con), mtx, and mtx-erf. the rats in the con and mtx groups were fed for 4 weeks on a basal diet, and those in the mtx-erf group were fed on a 9.16% erf-containing basal diet. the rats in the mtx and mtx-erf groups were ad ...201323391910
synthetic dye decolorization by three sources of fungal laccase.decolorization of six synthetic dyes using three sources of fungal laccase with the origin of aspergillus oryzae, trametes versicolor, and paraconiothyrium variabile was investigated. among them, the enzyme from p. variabile was the most efficient which decolorized bromophenol blue (100%), commassie brilliant blue (91%), panseu-s (56%), rimazol brilliant blue r (rbbr; 47%), congo red (18.5%), and methylene blue (21.3%) after 3 h incubation in presence of hydroxybenzotriazole (hbt; 5 mm) as the l ...201223369690
the effects of supplementation of a novel bacterial 6-phytase on mineral digestibility and plasma minerals in lactating sows.pigs digest p in plant feedstuffs poorly because pigs do not produce sufficient endogenous phytase to hydrolyze p from phytate (inositol hexaphosphate). supplementation of phytase to diets of piglets and grower-finisher pigs increased digestibility of minerals including p and ca; however, data on phytase efficacy in lactating sows are scarce. therefore, effects of adding a bacterial 6-phytase expressed in a strain of aspergillus oryzae (ronozyme hiphos; dsm nutritional products, basel, switzerla ...201223365301
the supplementation of low-p diets with microbial 6-phytase expressed in aspergillus oryzae improves p digestibility in sows.two trials were conducted to evaluate a novel microbial 6-phytase expressed in aspergillus oryzae (ronozyme hiphos; dsm nutritional products, basel, switzerland) in gestating and lactating sows. in the first trial, 24 sows (duroc × landrace; 223 kg bw) were offered, at 16 d of gestation, a low-p control diet (formulated to provide 4.0 g total p/kg; 1.5 g digestible p/kg) supplemented with 0, 500, or 1000 phytase activity (fyt)/kg of phytase. two weeks later, fresh feces were sampled from all sow ...201223365297
the supplementation of low-p diets with microbial 6-phytase expressed in aspergillus oryzae increases p and ca digestibility in growing pigs.a trial was conducted to evaluate the dose response of a novel microbial 6-phytase expressed in aspergillus oryzae (ronozyme hiphos; dsm nutritional products, basel, switzerland) in pigs. forty-eight individually housed pigs (landrace × pietrain; 52 kg bw; 24 males and 24 females) were distributed among 6 experimental treatments consisting of a low-p diet (3.5 g p/kg; 1.1 g digestible p/kg), which was supplemented with 500, 1000, 2000, or 4000 units of phytase activity/kg, and a standard-p diet ...201223365288
enzymatic synthesis of 2-aminoethyl β-d-galactopyranoside catalyzed by aspergillus oryzae β-galactosidase.glycosidases provide a powerful resource for in vitro synthesis of novel anomerically pure glycosides. generation of new low molecular weight galactosides is of interest since they are potential galectin inhibitors. galectins are molecular targets for cancer therapy and thus their inhibitors are potential antitumor agents. here we report the enzymatic synthesis and structural characterization of 2-aminoethyl β-d-galactopyranoside. critical parameters for transgalactosylation using either soluble ...201223357285
heterologous expression and characterization of a glycoside hydrolase family 45 endo-β-1,4-glucanase from a symbiotic protist of the lower termite, reticulitermes speratus.the termite symbiotic system is one of the efficient lignocellulose degradation systems. we tried to express and characterize a novel cellulolytic enzyme from this system. here, we report the isolation of an endo-β-1,4-glucanase gene homolog of glycoside hydrolase family 45 from a symbiotic protistan community of reticulitermes speratus. heterologous expression of this gene was performed using the expression system of aspergillus oryzae. analysis of enzymatic properties revealed 786 μmol/min/mg ...201323354496
purification and characterization of a glutaminase enzyme accounting for the majority of glutaminase activity in aspergillus sojae under solid-state culture.glutaminase, an enzyme that hydrolyzes l-glutamine to l-glutamate, plays an important role in the production of fermented foods by enhancing the umami taste. in this study, we found ten glutaminase genes in the aspergillus sojae genome by conducting a blast search of the characterized glutaminase sequence. we subsequently constructed glutaminase gene disruptants. the glutaminase activity of the gahb disruptant was decreased by approximately 90 % in a. sojae and aspergillus oryzae, indicating tha ...201323339014
offline and online capillary electrophoresis enzyme assays of β-n-acetylhexosaminidase.enzyme assays of β-n-acetylhexosaminidase from aspergillus oryzae using capillary electrophoresis in the offline and online setup have been developed. the ph value and concentration of the borate-based background electrolyte were optimized in order to achieve baseline separation of n,n',n″-triacetylchitotriose, n,n'-diacetylchitobiose, and n-acetyl-d-glucosamine. the optimized method using 25 mm tetraborate buffer, ph 10.0, was evaluated in terms of repeatability, limits of detection, quantifica ...201323338752
a straightforward access to tmg-chitooligomycins and their evaluation as β-n-acetylhexosaminidase inhibitors.a chemo-biotechnological approach is reported for the synthesis of tmg-chitooligomycins, co-n (nme(3)). their abilities to inhibit β-n-acetylhexosaminidases (hexnacases), from aspergillus oryzae (aohex, fungi), canavalia ensiformis (cehex, plant) hexnacases and a chitobiase from serratia marcescens (smchb, bacteria) were studied and compared with their precursors co-n (n). co-n (nme(3)) were revealed as potent inhibitors for aohex and smchb with a proved chain length effect while co-n (n) was a ...201223333949
detailed analysis of galactooligosaccharides synthesis with β-galactosidase from aspergillus oryzae.the synthesis of galactooligosaccharides (gos) catalyzed by β-galactosidase from aspergillus oryzae (enzeco) was studied. using 400 g/l of lactose and 15 u/ml, maximum gos yield, measured by hpaec-pad, was 26.8% w/w of total carbohydrates, obtained at approximately 70% lactose conversion. no less than 17 carbohydrates were identified; the major transgalactosylation product was 6'-o-β-galactosyl-lactose, representing nearly one-third (in weight) of total gos. in contrast with previous reports, th ...201323330921
identification of ophiobolin f synthase by a genome mining approach: a sesterterpene synthase from aspergillus clavatus.during a screening of putative diterpene synthase genes found in public databases using the aspergillus oryzae expression system, it was found that a single transformant with the acla_76850 gene from a. clavatus produced a sesterterpene alcohol, ophiobolin f, and three minor sesterterpene hydrocarbons. the sesterterpene synthase has two catalytically independent domains (prenyltransferase/terpene cyclase) which are homologous to those of diterpene synthase, fusicoccadiene synthase. coevolution o ...201323324037
analysis of microflora profile in korean traditional nuruk.a variety of nuruk were collected from various provinces in korea, and their microflora profiles were analyzed at the species level. a total of 42 nuruk samples were collected and when the viable cell numbers in these nuruk were enumerated, the average cell numbers of bacteria, fungi, yeast, and lactic acid bacteria from all nuruk were 7.21, 7.91, 3.49, and 4.88 log cfu/10 g, respectively. there were no significant differences in viable cell numbers of bacteria or fungi according to regions coll ...201323314366
reconstitution of biosynthetic machinery for indole-diterpene paxilline in aspergillus oryzae.indole-diterpenes represented by paxilline share a common pentacyclic core skeleton derived from indole and geranylgeranyl diphosphate. to shed light on the detailed biosynthetic mechanism of the paspaline-type hexacyclic skeleton, we examined the reconstitution of paxilline biosynthetic machinery in aspergillus oryzae nsar1. stepwise introduction of the six pax genes enabled us to isolate all biosynthetic intermediates and to synthesize paxilline. in vitro and in vivo studies on the key enzymes ...201323311903
isolation and characterisation of a ferrirhodin synthetase gene from the sugarcane pathogen fusarium sacchari.fsn1, a gene isolated from the sugar-cane pathogen fusarium sacchari, encodes a 4707-residue nonribosomal peptide synthetase consisting of three complete adenylation, thiolation and condensation modules followed by two additional thiolation and condensation domain repeats. this structure is similar to that of ferricrocin synthetase, which makes a siderophore that is involved in intracellular iron storage in other filamentous fungi. heterologous expression of fsn1 in aspergillus oryzae resulted i ...201323307607
optimization of the nutrition for biodegradation of vinasse by aspergillus oryzae using response surface methodology.direct discharge of vinasse from the distillery industry causes resource wasting and environmental destruction due to its mass of organic components. aspergillus oryzae cgmcc5992 is capable of degrading the organic substrates of wastewater. one-factor-at-a-time design was adopted to select the most important nutrients influencing the degradation of organic materials of vinasse. box-behnken design (bbd) with design-expert (8.0.4) was used to develop mathematical model equations, study responses, ...201323306254
identification of csypyrone b2 and b3 as the minor products of aspergillus oryzae type iii polyketide synthase csyb.since our first report on the identification of the fungal type iii polyketide synthase (pks) genes csya~d in aspergillus oryzae rib40, type iii pks homologues have also been found in other fungal species. we previously reported the isolation and structural determination of csypyrone b1 as the main product of csyb when inductively expressed in aspergillus oryzae. herein we report the isolation and identification of the two minor products of the csyb transformant in addition to csypyrone b1 as 4- ...201223290452
two-step purification of a novel β-glucosidase with high transglycosylation activity and another hypothetical β-glucosidase in aspergillus oryzae hml366 and enzymatic characterization.two novel β-glucosidases (bghg1 and bghg2) were purified from the enzyme extract of aspergillus oryzae hml366 through nondenaturing gel electrophoresis and anion-exchange chromatography. the molecular weights for bghg1 and bghg2 were 93 and 138 kda, respectively. the amino acid sequences were determined by matrix-assisted laser desorption/ionization tandem time of flight. the mascot and blast analyses indicated that bghg1 has the same sequence as the hypothetical protein xp_001816831 from a. ory ...201323288594
xylitol production by nad(+)-dependent xylitol dehydrogenase (xdha)- and l-arabitol-4-dehydrogenase (lada)-disrupted mutants of aspergillus oryzae.aspergillus oryzae can metabolize xylan to d-xylose and d-xylose to xylitol. however, accumulation of xylitol is controlled by dehydrogenases, such as xylitol dehydrogenase (xdh) and l-arabitol-4-dehydrogenase (lad), and fluxed into the pentose phosphate pathway. in a. oryzae, xdh and lad are encoded by xdha and lada, respectively. we disrupted the xdha and lada genes individually in an attempt to increase xylitol production. the xdha- and lada-disrupted mutants were constructed by homologous tr ...201323287496
lethal and mutagenic effects of ion beams and γ-rays in aspergillus oryzae.aspergillus oryzae is a fungus that is used widely in traditional japanese fermentation industries. in this study, the lethal and mutagenic effects of different linear energy transfer (let) radiation in freeze-dried conidia of a. oryzae were investigated. the lethal effect, which was evaluated by a 90% lethal dose, was dependent on the let value of the ionizing radiation. the most lethal ionizing radiation among that tested was (12)c(5+) ion beams with an let of 121kev/μm. the (12)c(5+) ion beam ...201223280012
in vitro antifungal activity of dehydrozingerone and its fungitoxic properties.the efficacy of dehydrozingerone (dz; dehydroderivative of zingerone) as an antifungal agent and its mode of action against food spoilage fungal pathogens was studied and presented. dz is a constituent of ginger (zingiber officinale rhizomes) and structural half analogue of curcumin. its efficacy against aspergillus oryzae, aspergillus flavus, aspergillus niger, aspergillus ochraceus, fusarium oxysporum and penicillium chrysogenum was evaluated. effect of dz on the growth and sporulation of a. o ...201223278709
assessing the genome-wide effect of promoter region tandem repeat natural variation on gene expression.copy number polymorphisms of nucleotide tandem repeat (tr) regions, such as microsatellites and minisatellites, are mutationally reversible and highly abundant in eukaryotic genomes. studies linking tr polymorphism to phenotypic variation have led some to suggest that tr variation modulates and majorly contributes to phenotypic variation; however, studies in which the authors assess the genome-wide impact of tr variation on phenotype are lacking. to address this question, we quantified relations ...201223275886
an integrative process model of enzymatic biodiesel production through ethanol fermentation of brown rice followed by lipase-catalyzed ethanolysis in a water-containing system.we attempted to integrate lipase-catalyzed ethanolysis into fermentative bioethanol production. to produce bioethanol, ethanol fermentation from brown rice was conducted using a tetraploid saccharomyces cerevisiae expressing α-amylase and glucoamylase. the resultant ethanol was distilled and separated into three fractions with different concentrations of water and fusel alcohols. in ethanolysis using the first fraction with 89.3% ethanol, a recombinant aspergillus oryzae whole-cell biocatalyst e ...201223273281
steroid toxicity and detoxification in ascomycetous fungi.in the last couple of decades fungal infections have become a significant clinical problem. a major interest into fungal steroid action has been provoked since research has proven that steroid hormones are toxic to fungi and affect the host/fungus relationship. steroid hormones were found to differ in their antifungal activity in ascomycetous fungi hortaea werneckii, saccharomyces cerevisiae and aspergillus oryzae. dehydroepiandrosterone was shown to be the strongest inhibitor of growth in all t ...201323257178
identification of regulatory elements in the glucoamylase-encoding gene (glab) promoter from aspergillus oryzae.the aspergillus oryzae glucoamylase-encoding gene glab is expressed specifically and strongly only during solid-state cultivation (ssc). to elucidate the basis for the specificity, the glab promoter was analyzed by electrophoretic gel mobility shift assay (emsa) which indicated two protein-binding elements from -382 to -353 and from -332 to -313. to confirm that these regions contained cis-elements, deletion analysis of the promoter was undertaken using β-glucuronidase as a reporter. the results ...201323224588
pei-coated gold nanoparticles decorated with laccase: a new platform for direct electrochemistry of enzymes and biosensing applications.this paper describes the synthesis and characterization of pei-coated gold nanoparticles (pei-aunp), which were applied as a new platform in the immobilization of laccase (lac) originating from aspergillus oryzae. this material (pei-aunp-lac) was used in the construction of a biosensor based on a glassy carbon electrode coated with a bio-nanostructured film. the occurrence of direct electron transfer (det) between the electroactive center of lac and the electrode surface was observed by cyclic v ...201323208093
functional expression of a foreign gene in aspergillus oryzae producing new pyrone compounds.fungi from the genus xylaria produce a wide range of polyketides with diverse structures, which provide important sources for pharmaceutical agents. at least seven polyketide synthase (pks) genes, including pksmt, were found in xylaria sp. bcc 1067. the multifunctional enzyme pksmt contains the following catalytic motifs: β-ketosynthase (ks), acyltransferase (at), dehydratase (dh), methyltransferase (mt), enoylreductase (er), ketoreductase (kr), and acyl carrier region (acp). the presence of mul ...201323174282
functional analysis of aoatg1 and detection of the cvt pathway in aspergillus oryzae.autophagy is a degradation system in which cellular components are digested via vacuoles/lysosomes. in the budding yeast saccharomyces cerevisiae, the induction of autophagy results from inactivation of target of rapamycin complex 1 (torc1), promoting formation of the serine/threonine kinase atg1, which is one of the key autophagy-related (atg) proteins required for both nonselective and selective autophagy such as the cytoplasm-to-vacuole targeting (cvt) pathway. here, to understand the inducti ...201323136971
enzymatic characteristics of a recombinant neutral protease i (rnpi) from aspergillus oryzae expressed in pichia pastoris.a truncated neutral protease i (npi) from aspergillus oryzae 3.042 was expressed in pichia pastoris with a high enzyme yield of 43101 u/ml. its optimum ph was about 8.0, and it was stable in the ph range of 5.0-9.0. its optimum temperature was about 55 °c and retained >90% activity at 50 °c for 120 min. recombinant npi (rnpi) was inhibited by cu(2+) and edta. eight cleavage sites of rnpi in oxidized insulin b-chain were determined by mass spectrometry, and five of them had high hydrophobic amino ...201223136814
isolation and characterization of the mhea (most highly expressed) gene of aspergillus oryzae.the amino acid sequence of the mhea gene of aspergillus oryzae encodes a putative metallothionein-like protein 1. the size of the mhea transcript was 497 nt and the mhea promoter was induced by glucose, consistent with results of analysis by northern hybridization and with the pdca promoter, respectively.201223115516
hyphal heterogeneity in aspergillus oryzae is the result of dynamic closure of septa by woronin bodies.hyphae of higher fungi are compartmentalized by septa. these septa contain a central pore that allows for inter-compartmental and inter-hyphal cytoplasmic streaming. the cytoplasm within the mycelium is therefore considered to be a continuous system. in this study, however, we demonstrate by laser dissection that 40% of the apical septa of exploring hyphae of aspergillus oryzae are closed. closure of septa correlated with the presence of a peroxisome-derived organelle, known as woronin body, nea ...201223106143
engineering hyperthermostability into a mesophilic family 11 xylanase from aspergillus oryzae by in silico design of n-terminus substitution.a mesophilic xylanase from aspergillus oryzae cicc40186 (abbreviated to aoxyn11a) belongs to glycoside hydrolase family 11. the thermostability of aoxyn11a was significantly improved by substituting its n-terminus with the corresponding region of a hyperthermostable family 11 xylanase, evxyn11(ts) . the suitable n-terminus of aoxyn11a to be replaced was selected by the comparison of b-factors between aoxyn11a and evxyn11(ts) , which were generated and calculated after a 15 ns molecular dynamic ( ...201323097144
a toolkit for heterologous expression of metabolic pathways in aspergillus oryzae.much has been learned about the activities of the key enzymes involved in eukaryotic natural product synthesis by isolating the relevant genes and expressing them in a suitable foreign host. aspergillus oryzae has proved to be an amenable host for the functional analysis of megasynthases from other fungi, but secondary metabolites are often the products of suites of enzymes, and understanding their biosynthesis requires simultaneous expression of several genes. this chapter describes the develop ...201223084942
reconstitution of a secondary metabolite biosynthetic pathway in a heterologous fungal host.expression of multiple genes involved in a particular metabolic pathway in a heterologous host facilitates the study of fungal secondary metabolite biosynthesis and production of useful compounds. two plasmids with different selection markers, argb and the pyrithiamine resistance marker, are used to transform aspergillus oryzae allowing for expression of up to three genes simultaneously.201223065616
manr, a novel zn(ii)2cys6 transcriptional activator, controls the β-mannan utilization system in aspergillus oryzae.fungal endo-β-mannanases (β-mannanases) are widely used as industrial enzymes; however, no transcriptional regulator of β-mannanases has been identified in fungi or other eukaryotic cells to date. to identify a transcriptional regulator of β-mannanases in aspergillus oryzae, a gene-disruptant library of transcriptional regulators was screened for mutants exhibiting reduced β-mannanase activity by using konjac glucomannan as the substrate, and manr, a zn(ii)(2)cys(6) type dna binding protein was ...201223063954
endophytes from an australian native plant are a promising source of industrially useful enzymes.endophytes are microorganisms that live within plant tissues that are potential sources of novel bioactive compounds, including enzymes. we have identified endophytes of the australian native plant eremophilia longifolia which were screened for the production of industrially useful enzymes. seventeen fungal endophytes were isolated from the leaves of e. longifolia and enzyme production was investigated within a range of ph (3.5, 5.5, 7 and 9) and temperatures (9, 25, 37 and 50 °c). amylase was t ...201323054705
activation mechanism of melb tyrosinase from aspergillus oryzae by acidic treatment.the pro form of recombinant tyrosinase from aspergillus oryzae (melb) shows no catalytic activity, but acid treatment (around ph 3.5) of protyrosinase activates it to induce tyrosinase activity. circular dichroism spectra, gel filtration analysis, and colorimetric assay have indicated that acid treatment around ph 3.5 induced the disruption of the conformation of the c-terminal domain covering the enzyme active site. these structural changes induced by the acid treatment may open the entrance to ...201323053534
characterization of a novel lipolytic enzyme from aspergillus oryzae.in this study, we report the characterization of a protein from aspergillus oryzae, exhibiting sequence identity with paraben esterase from the genus aspergillus. the coding region of 1,586 bp, including a 77-bp intron, encoded a protein of 502 amino acids. the gene without the signal peptide of 19 amino acids was cloned into a vector, ppiczαc, and expressed successfully in pichia pastoris as an active extracellular protein. the purified recombinant protein had ph and temperature optima of 7.0-8 ...201323001008
serine-type carboxypeptidase kexa of aspergillus oryzae has broader substrate specificity than saccharomyces cerevisiae kex1 and is required for normal hyphal growth and conidiation.aspergillus oryzae has an ortholog of saccharomyces cerevisiae kex1, termed kexa. a truncated form of kexa protein showed serine-type carboxypeptidase activity and somewhat broader substrate specificity than kex1 protease. furthermore, our results indicated that kexa is required for normal growth of a. oryzae and that it might be involved in hyphal branching.201222961905
production of polygalacturonases by aspergillus oryzae in stirred tank and internal- and external-loop airlift reactors.the production of endo- and exo-polygalacturonase (pg) by aspergillus oryzae was assessed in stirred tank reactors (strs), internal-loop airlift reactors (ilars) and external-loop airlift reactors (elars). for str production, we compared culture media formulated with either pectin (wbe) or partially hydrolyzed pectin. the highest enzyme activities were obtained in medium that contained 50% pectin in hydrolyzed form (wbe5). pg production in the three reactor types was compared for wbe5 and low sa ...201222940313
kinetic analysis, expression pattern, and production of a recombinant fungal protease inhibitor of tasar silkworm antheraea mylitta.antheraea mylitta, a tasar silk-producing insect of saturniidae family, expresses a fungal protease inhibitor named as a. mylitta fungal protease inhibitor-1 (amfpi-1). amfpi-1 inhibits alkaline protease of aspergillus oryzae but its mechanism of action is not known. to understand the mode of inhibition of amfpi-1 against the fungal protease, it was purified from the hemolymph of a. mylitta larvae and inhibitory activity against a. oryzae protease was studied. kinetic analysis of purified amfpi- ...201222935928
draft genome sequence of aspergillus oryzae strain 3.042.aspergillus oryzae is the most important fungus for the traditional fermentation in china and is particularly important in soy sauce fermentation. we report the 36,547,279-bp draft genome sequence of a. oryzae 3.042 and compared it to the published genome sequence of a. oryzae rib40.201222933657
identification of antifungal niphimycin from streptomyces sp. kp6107 by screening based on adenylate kinase assay.microbial culture extracts are used for natural product screening to find antifungal lead compounds. a microbial culture extract library was constructed using 343 actinomycete isolates to examine the value of the adenylate kinase (ak) assay for screening to identify antifungal metabolites that disrupt cell integrity in plant pathogenic fungi. a culture extract of streptomyces sp. strain kp6107 lysed cells of fusarium oxysporum f.sp. lycopersici which resulted in high ak activity. the active ingr ...201322915202
comparative genome analysis between aspergillus oryzae strains reveals close relationship between sites of mutation localization and regions of highly divergent genes among aspergillus species.aspergillus oryzae has been utilized for over 1000 years in japan for the production of various traditional foods, and a large number of a. oryzae strains have been isolated and/or selected for the effective fermentation of food ingredients. characteristics of genetic alterations among the strains used are of particular interest in studies of a. oryzae. here, we have sequenced the whole genome of an industrial fungal isolate, a. oryzae rib326, by using a next-generation sequencing system and com ...201222912434
improved heterologous protein production by a tripeptidyl peptidase gene (aosedd) disruptant of the filamentous fungus aspergillus oryzae.proteolytic degradation is one of the serious bottlenecks limiting the yields of heterologous protein production by aspergillus oryzae. in this study, we selected a tripeptidyl peptidase gene aosedd (ao090166000084) as a candidate potentially degrading the heterologous protein, and performed localization analysis of the fusion protein aosedd-egfp in a. oryzae. as a result, the aosedd-egfp was observed in the septa and cell walls as well as in the culture medium, suggesting that aosedd is a secre ...201222878738
contribution ratios of amya, amyb, amyc genes to high-level α-amylase expression in aspergillus oryzae.aspergillus oryzae strains express α-amylases abundantly, and the genome reference strain rib40 has three α-amylase genes (amya, amyb, and amyc). however, there is no information on the contribution ratios of individual α-amylase genes to total expression. in this study, we generated single, double, and triple disruptants of α-amylase genes by employing a strain (δligd) with high gene-targeting efficiency and pyrg marker recycling in a. oryzae. all the disruptants showed reduced activities of α- ...201222878189
degradation of terbuthylazine, difenoconazole and pendimethalin pesticides by selected fungi cultures.contamination of waters by xenobiotic compounds such as pesticides presents a serious environmental problem with substantial levels of pesticides now contaminating european water resources. the aim of this work was to evaluate the ability of the fungi fusarium oxysporum, aspergillus oryzae, lentinula edodes, penicillium brevicompactum and lecanicillium saksenae, for the biodegradation of the pesticides terbuthylazine, difenoconazole and pendimethalin in batch liquid cultures. these pesticides ar ...201222878100
isolation and identification of two novel umami and umami-enhancing peptides from peanut hydrolysate by consecutive chromatography and maldi-tof/tof ms.peanut hydrolysate produced by crude protease extract from aspergillus oryzae hn 3.042 was found to elicit intense umami and umami-enhancing effect. taste profiles, amino acid and organic acid composition of peanut hydrolysate and its separation fractions by ultrafiltration were evaluated. the results revealed that peanut hydrolysate was mainly low molecular weight compounds. fractions of 1-3 kda and below 1 kda prominently contributed to the umami taste and umami-enhancing effect of the peanut ...201222868117
production of biodiesel from plant oil hydrolysates using an aspergillus oryzae whole-cell biocatalyst highly expressing candida antarctica lipase b.for enzymatic biodiesel production from plant oil hydrolysates, an aspergillus oryzae whole-cell biocatalyst that expresses candida antarctica lipase b (r-calb) with high esterification activity was developed. each of soybean and palm oils was hydrolyzed using candida rugosa lipase, and the resultant hydrolysates were subjected to esterification where immobilized r-calb was used as a catalyst. in esterification, r-calb afforded a methyl ester content of more than 90% after 6 h with the addition ...201322850174
identification of a gene involved in the synthesis of a dipeptidyl peptidase iv inhibitor in aspergillus oryzae.wyk-1 is a dipeptidyl peptidase iv inhibitor produced by aspergillus oryzae strain ao-1. because wyk-1 is an isoquinoline derivative consisting of three l-amino acids, we hypothesized that a nonribosomal peptide synthetase was involved in its biosynthesis. we identified 28 nonribosomal peptide synthetase genes in the sequenced genome of a. oryzae rib40. these genes were also identified in ao-1. among them, ao090001000009 (wykn) was specifically expressed under wyk-1-producing conditions in ao-1. ...201222843525
removal of off-flavors from sea tangle (laminaria japonica) extract by fermentation with aspergillus oryzae.this study was conducted to reduce off-flavors from sea tangle (laminaria japonica) extract since the typical odor of seaweed is an impediment to consumption of seaweed products. fifty-six odor compounds emitted from the extract were identified using a thermal desorbor and gas chromatography-mass spectrometry. on the basis of expected odor intensity (eoi), isovaleric acid (41.2%), allyl isothiocyanate (22.6%), octanal (11.1%) and acetaldehyde (10.6%) were responsible for about 85.5% of total odo ...201222840201
comparison of expression and enzymatic properties of aspergillus oryzae lysine aminopeptidases apsa and apsb.the apsa and apsb genes encoding family m1 aminopeptidases were identified in the industrial fungus aspergillus oryzae. the apsb was transcriptionally up-regulated up to 2.5-fold in response to the deprivation of nitrogen or carbon sources in growth media, while up-regulation of apsa was less significant. the encoded proteins were bacterially expressed and purified to characterize their enzymatic properties. apsa and apsb were optimally active at ph 7.0 and 35 °c and stable at ph ranges of 6-10 ...201222806190
solid-state fermentation of soybean and corn processing coproducts for potential feed improvement.two agro-industrial coproducts, soybean cotyledon fiber and distiller's dried grains with solubles (ddgs), were used as substrates to evaluate the effect of coculturing three different fungi, aspergillus oryzae, trichoderma reesei, and phanerochaete chrysosporium, on enzyme production by solid-state fermentation (ssf). when soybean fiber was used as the substrate, a maximum xylanase activity of 757.4 iu/g and a cellulase activity of 3.2 iu/g were achieved with the inoculation and incubation of t ...201222799754
the evolutionary imprint of domestication on genome variation and function of the filamentous fungus aspergillus oryzae.the domestication of animals, plants, and microbes fundamentally transformed the lifestyle and demography of the human species [1]. although the genetic and functional underpinnings of animal and plant domestication are well understood, little is known about microbe domestication [2-6]. here, we systematically examined genome-wide sequence and functional variation between the domesticated fungus aspergillus oryzae, whose saccharification abilities humans have harnessed for thousands of years to ...201222795693
identification and characterization of useful fungi with α-amylase activity from the korean traditional nuruk.the objective of this study was to find useful fungi with α-amylase activity from the korean traditional nuruk for the quality of traditional korean alcoholic beverage. in this study, 165 samples of traditional nuruk were collected from 170 regions throughout korea and the fungi were isolated to a total of 384 strains. in order to investigate the effect of microflora on nuruk, α-amylase activity, saccharogenic power (sp), starch hydrolysis activity and acid producing activity were evaluated. ten ...201122783116
cloning and expression of the aspergillus oryzae glucan 1,3-beta-glucosidase a (exga) in pichia pastoris.the glucan 1,3-beta-glucosidase a gene (exga) from aspergillus oryzae and fused to the saccharomyces cerevisiae signal peptide (α-factor) was expressed under the control of either a constitutive (gap) or an inducible (aox1) promoter in pichia pastoris. a 1.4-fold higher extracellular enzyme activity (2 u/ml) was obtained using the aox1 inducible expression system than with the gap constitutive promoter (1.4 u/ml). the purified recombinant exga enzyme, with a yield of 10 mg protein/l culture supe ...201222782265
population-based study reveals new risk-stratification biomarker panel for barrett's esophagus.the risk of progression of barrett's esophagus (be) to esophageal adenocarcinoma (eac) is low and difficult to calculate. accurate tools to determine risk are needed to optimize surveillance and intervention. we assessed the ability of candidate biomarkers to predict which cases of be will progress to eac or high-grade dysplasia and identified those that can be measured in formalin-fixed tissues.201222771507
high production of llama variable heavy-chain antibody fragment (vhh) fused to various reader proteins by aspergillus oryzae.llama variable heavy-chain antibody fragment (vhh) fused to four different reader proteins was produced and secreted in culture medium by aspergillus oryzae. these fusion proteins consisted of n-terminal reader proteins, vhh, and a c-terminal his-tag sequence which facilitated purification using one-step his-tag affinity chromatography. sds-page analysis of the deglycosylated purified fusion proteins confirmed that the molecular weight of each corresponded to the expected sum of vhh and the resp ...201322752366
common and distant structural characteristics of feruloyl esterase families from aspergillus oryzae.feruloyl esterases (faes) are important biomass degrading accessory enzymes due to their capability of cleaving the ester links between hemicellulose and pectin to aromatic compounds of lignin, thus enhancing the accessibility of plant tissues to cellulolytic and hemicellulolytic enzymes. faes have gained increased attention in the area of biocatalytic transformations for the synthesis of value added compounds with medicinal and nutritional applications. following the increasing attention on the ...201222745763
metabolomics-based optimal koji fermentation for tyrosinase inhibition supplemented with astragalus radix.the present study was focused on improving the quality of rice koji by fermentation with a selected aspergillus oryzae strain and a plant astragalus radix. a. oryzae kccm 60345 was used as main inoculant and the astragalus radix was added as supplement in rice koji preparation. lc-ms based metabolite analysis and tyrosinase inhibitory activities were studied for different time periods. a. oryzae kccm 60345 fermented rice koji supplemented with astragalus showed higher tyrosinase inhibition activ ...201222738950
increased production of fatty acids and triglycerides in aspergillus oryzae by enhancing expressions of fatty acid synthesis-related genes.microbial production of fats and oils is being developed as a means of converting biomass to biofuels. here we investigate enhancing expression of enzymes involved in the production of fatty acids and triglycerides as a means to increase production of these compounds in aspergillus oryzae. examination of the a. oryzae genome demonstrates that it contains two fatty acid synthases and several other genes that are predicted to be part of this biosynthetic pathway. we enhanced the expression of fatt ...201322733113
jewelry boxes contaminated by aspergillus oryzae: an occupational health risk?in 2009, 100,000 jewelry boxes, manufactured in china, were delivered to a jewelry manufacturer in besançon, france. all the boxes were contaminated by mold. because the workers refused to handle these jewelry boxes, the company contacted our laboratory to determine how to deal with the problem. three choices were available: (1) decontaminate the boxes, (2) return the boxes to the chinese manufacturer, or (3) destroy the entire shipment. based on microscopic identification, the culture analysis ...201222702230
a novel glycosylphosphatidylinositol-anchored glycoside hydrolase from ustilago esculenta functions in β-1,3-glucan degradation.a glycoside hydrolase responsible for laminarin degradation was partially purified to homogeneity from a ustilago esculenta culture filtrate by weak-cation-exchange, strong-cation-exchange, and size-exclusion chromatography. three proteins in enzymatically active fractions were digested with chymotrypsin followed by liquid chromatography-tandem mass spectrometry (lc/ms/ms) analysis, resulting in the identification of three peptide sequences that shared significant similarity to a putative β-1,3- ...201222685137
post-genomic approaches to understanding interactions between fungi and their environment.fungi inhabit every natural and anthropogenic environment on earth. they have highly varied life-styles including saprobes (using only dead biomass as a nutrient source), pathogens (feeding on living biomass), and symbionts (co-existing with other organisms). these distinctions are not absolute as many species employ several life styles (e.g. saprobe and opportunistic pathogen, saprobe and mycorrhiza). to efficiently survive in these different and often changing environments, fungi need to be ab ...201122679591
transcripts of a heterologous gene encoding mite allergen der f 7 are stabilized by codon optimization in aspergillus oryzae.we have previously demonstrated that transcripts of an at-biased heterologous gene encoding mite allergen der f 7 from dermatophagoides farinae were polyadenylated prematurely within the coding region when native cdna was expressed in aspergillus oryzae, and that this premature polyadenylation was prevented by the codon optimization of the der f 7 gene, resulting in increased steady-state mrna levels. in this study, we tested the stability of transcription products derived from expression constr ...201222644529
efficient heterologous expression and secretion in aspergillus oryzae of a llama variable heavy-chain antibody fragment v(hh) against egfr.we have constructed a filamentous fungus aspergillus oryzae that secretes a llama variable heavy-chain antibody fragment (v(hh)) that binds specifically to epidermal growth factor receptor (egfr) in a culture medium. a major improvement in yield was achieved by fusing the v(hh) with a taka-amylase a signal sequence (staa) and a segment of 28 amino acids from the n-terminal region of rhizopus oryzae lipase (n28). the yields of secreted, immunologically active anti-egfr v(hh) reached 73.8 mg/1 in ...201222644525
comparative proteome analysis of aspergillus oryzae 3.042 and a. oryzae 100-8 strains: towards the production of different soy sauce flavors.aspergillus oryzae plays a central role in soybean fermentation, particularly in its contribution to the flavor of soy sauce. we present a comparative assessment of the intracellular differences between wild-type strain 3.042 and mutant strain a100-8, at the proteome level. 522 different protein spots were identified by maldi-tof ms, with 134 spots being confirmed by maldi-tof ms/ms. of these, 451 were differentially expressed proteins (deps). there was at least a two-fold increase for 288 spots ...201222634401
a heptaketide naphthaldehyde produced by a polyketide synthase from nectria haematococca.bostrycoidin and fusarubin are biologically active fungal polyketides produced by nectria haematococca. this azaanthraquinone and naphthoquinone are thought to be biosynthesized via formation of a c(14) heptaketide aldehyde as a common key intermediate. a blast search against the genome of n. haematococca revealed one candidate gene (nechadraft_101778, nhpks1), which encodes a multi-domain polyketide synthase (pks) with a thiol reductase (tr) domain that would facilitate the reductive release of ...201222633689
gene cloning, purification, and characterization of a novel peptidoglutaminase-asparaginase from aspergillus sojae.glutaminase is an enzyme that catalyzes the hydrolysis of l-glutamine to l-glutamate, and it plays an important role in the production of fermented foods by enhancing the umami taste. by using the genome sequence and expressed sequence tag data available for aspergillus oryzae rib40, we cloned a novel glutaminase gene (asgaha) from aspergillus sojae, which was similar to a previously described gene encoding a salt-tolerant, thermostable glutaminase of cryptococcus nodaensis (cngaha). the structu ...201222610430
changes in selected physical property and enzyme activity of rice and barley koji during fermentation and storage.koji are solid-state fermentation products made by inoculating steamed grains with the spores of fungi, particularly aspergillus spp. this research was undertaken to identify the fermentation and storage conditions optimal for the production and maintenance of selected hydrolytic enzymes, such as α-amlyase and protease, in koji. steamed rice and barley were inoculated with 2 × 10 ¹¹ aspergillus oryzae spores per kilogram of grains and fermented for 118 h in a growth chamber at 28 to 32 °c with c ...201222583119
two new steroidal saponins from the biotransformation product of the rhizomes of dioscorea nipponica.two new steroidal saponins, dioscins e (1) and f (2), along with nine known steroidal saponins, were isolated from the biotransformation product of the rhizomes of dioscorea nipponica using aspergillus oryzae. the structures of new compounds were established as 25(r)-spirost-5-en-21β-methyl-3β-ol-3-o-α-l-rhamnopyranosyl-(1 → 4)-β-d-glucopyranoside (1) and (25r)-spirost-5-en-3β-ol-7-one 3-o-α-l-rhamnopyranosyl-(1 → 4)-β-d-glucopyranoside (2) by detailed spectroscopic analyses including 1d and 2d ...201222582713
effects of different fermented soy protein and apparent ileal digestible lysine levels on weaning pigs fed fermented soy protein-amended diets.two experiments were conducted to evaluate the effect of different fermented soybean proteins and the apparent ileal digestible lysine levels on weaning pigs fed fermented soy protein (fsp)-amended diets. in exp. 1, 70 crossed piglets (6.25 ± 0.40 kg) were used in a 5-week trial to evaluate two different fsp. in exp. 2, 20 weaning barrows (6.15 ± 0.45 kg) were used in a metabolism trial to determine the effects of the apparent ileal digestible (1.2, 1.3, 1.4 and 1.5%) lysine levels in weaning pi ...201122574792
the evolution of three types of indoleamine 2,3 dioxygenases in fungi with distinct molecular and biochemical characteristics.indoleamine 2,3-dioxygenase (ido) is a tryptophan-degrading enzyme and known as a mammalian immunosuppressive molecule. in fungi, the primary role of ido is to supply nicotinamide adenine dinucleotide (nad(+)) via the kynurenine pathway. we previously reported that the koji-mold, aspergillus oryzae has two ido genes, idoα and idoβ. in the present study, we found that a. oryzae also has the third ido, idoγ. these three-types of idos are widely distributed among the pezizomycotina fungi, although ...201222564706
meju, unsalted soybeans fermented with bacillus subtilis and aspergilus oryzae, potentiates insulinotropic actions and improves hepatic insulin sensitivity in diabetic rats. 201222550941
lect-hepa, a glyco-marker derived from multiple lectins, as a predictor of liver fibrosis in chronic hepatitis c patients.assessment of liver fibrosis in patients with chronic hepatitis c (chc) is critical for predicting disease progression and determining future antiviral therapy. lect-hepa, a new glyco-marker derived from fibrosis-related glyco-alteration of serum alpha 1-acid glycoprotein, was used to differentiate cirrhosis from chronic hepatitis in a single-center study. herein, we aimed to validate this new glyco-marker for estimating liver fibrosis in a multicenter study. overall, 183 chc patients were recru ...201222535703
evaluation of enzyme activity and fiber content of soybean cotyledon fiber and distiller's dried grains with solubles by solid state fermentation.to increase the value of coproducts from corn ethanol fermentation and soybean aqueous processing, distiller's dried grains with solubles (ddgs) and soybean cotyledon fiber were used as the substrates for solid state fermentation (ssf) to improve feed digestibility. aspergillus oryzae, trichoderma reesei, and phanerochaete chrysosporium were chosen as they produce desirable enzymes and are widely used in ssf for feed. the results showed that the cellulase and xylanase activities were significant ...201222528656
kinetic modeling of fructooligosaccharide production using aspergillus oryzae n74.in this study, the kinetic for the bioconversion of sucrose to fructooligosaccharides (fos) by free cells of aspergillus oryzae n74 was modeled. in addition, the effect of immobilized glucose isomerase (igi) on fos production yield was evaluated and considered in the kinetic model. the selected kinetic models were based on a proposed reaction mechanism described by elementary rate equations and modified michaelis-menten kinetic equations. the use of igi allowed to increase the fos production yie ...201222528647
synthesis of β-d-fructofuranosyl-(2→1)-2-acetamido-2-deoxy-α-d-glucopyranoside (n-acetylsucrosamine) using β-fructofuranosidase-containing aspergillus oryzae mycelia as a whole-cell catalyst.using soft granules consisting of celite 535 and dried aspergillus oryzae nbrc100959 mycelia containing β-fructofuranosidase as a whole-cell catalyst, n-acetylsucrosamine [β-d-fructofuranosyl-(2→1)-2-acetamido-2-deoxy-α-d-glucopyranoside] was produced from sucrose and 2-acetamido-2-deoxy-d-glucose by enzymatic transfructosylation. the isolated yield of n-acetylsucrosamine from the reaction mixture was 22.1% (from sucrose). the result of n-terminal amino acid sequence analysis indicated that the ...201222525099
genetic, molecular, and biochemical basis of fungal tropolone biosynthesis.a gene cluster encoding the biosynthesis of the fungal tropolone stipitatic acid was discovered in talaromyces stipitatus (penicillium stipitatum) and investigated by targeted gene knockout. a minimum of three genes are required to form the tropolone nucleus: tropa encodes a nonreducing polyketide synthase which releases 3-methylorcinaldehyde; tropb encodes a fad-dependent monooxygenase which dearomatizes 3-methylorcinaldehyde via hydroxylation at c-3; and tropc encodes a non-heme fe(ii)-depende ...201222508998
modified cre-loxp recombination in aspergillus oryzae by direct introduction of cre recombinase for marker gene rescue.marker rescue is an important molecular technique that enables sequential gene deletions. the cre-loxp recombination system has been used for marker gene rescue in various organisms, including aspergilli. however, this system requires many time-consuming steps, including construction of a cre expression plasmid, introduction of the plasmid, and cre expression in the transformant. to circumvent this laborious process, we investigated a method wherein cre could be directly introduced into aspergil ...201222504800
enhancing the value of nitrogen from rapeseed meal for microbial oil production.rapeseed meal, a major byproduct of biodiesel production, has been used as a low-cost raw material for the production of a generic microbial feedstock through a consolidated bioconversion process. various strategies were tested for the production of a novel fermentation medium, rich in free amino nitrogen (fan): commercial enzymes (ces) (2.7 mg g⁻¹ dry meal), liquid state fungal pre-treatment (lsf) using aspergillus oryzae (4.6 mg g⁻¹), liquid state fungal pre-treatment followed by fungal autoly ...201222500902
effect of a novel phytase on growth performance, apparent metabolizable energy, and the availability of minerals and amino acids in a low-phosphorus corn-soybean meal diet for broilers.the addition of microbial phytase to diets for broiler chickens has been shown to improve the availability of phytate p, total p, some other minerals, and amino acids. in this study, the effect of a novel microbial phytase expressed by synthetic genes in aspergillus oryzae on amino acid and mineral availability was assessed. phytase was incorporated (1,000 and 2,000 u/kg) into low-p corn-soybean meal-based diets for broilers. broilers received the experimental diets for 3 wk, and excreta were co ...201222499869
cloning, expression, and characterization of a cellobiose dehydrogenase from thielavia terrestris induced under cellulose growth conditions.the enzyme cellobiose dehydrogenase (cdh) is of considerable interest, not only for its biotechnological applications, but also its potential biological role in lignocellulosic biomass breakdown. the enzyme catalyzes the oxidation of cellobiose and other cellodextrins, utilizing a variety of one- and two-electron acceptors, although the electron acceptor employed in nature is still unknown. in this study we show that a cdh is present in the secretome of the thermophilic ascomycete thielavia terr ...201222484439
monitoring of the microbial communities involved in the soy sauce manufacturing process by pcr-denaturing gradient gel electrophoresis.soy sauce is a traditional seasoning produced through the fermentation of soybeans and wheat using microbes. in this study, the microbial communities involved in the soy sauce manufacturing process were analyzed by pcr-denaturing gradient gel electrophoresis (pcr-dgge). the bacterial dgge profile indicated that the bacterial microbes in the koji were weissella cibaria (weissella confusa, weissella kimchii, weissella salipiscis, lactobacillus fermentum, lactobacillus plantarum, lactobacillus iner ...201222475947
bioremediation of direct dyes in simulated textile effluents by a paramorphogenic form of aspergillus oryzae.azo dyes are extensively used for coloring textiles, paper, food, leather, drinks, pharmaceutical products, cosmetics and inks. the textile industry consumes the largest amount of azo dyes, and it is estimated that approximately 10-15% of dyes used for coloring textiles may be lost in waste streams. almost all azo dyes are synthetic and resist biodegradation, however, they can readily be reduced by a number of chemical and biological reducing systems. biological treatment has advantages over phy ...201222466598
overexpressing transcriptional regulator in aspergillus oryzae activates a silent biosynthetic pathway to produce a novel polyketide.fungal genomes carry many gene clusters seemingly capable of natural product biosynthesis, yet most clusters remain silent. this places a major constraint on the conventional approach of cloning these genes in more amenable heterologous host for the natural product biosynthesis. one way to overcome this difficulty is to activate the silent gene clusters within the context of the target fungus. here, we successfully activated a silent polyketide biosynthetic gene cluster in aspergillus oryzae by ...201222447538
evaluation of multiplexed pcr and liquid-phase array for identification of respiratory fungal pathogens.invasive fungal infections are the cause of serious morbidity and high mortality in immunocompromised patients. early laboratory diagnostic options remain limited; however, rapid detection and accurate identification may improve outcome. herein, multiplexed pcr followed by liquid-phase array was evaluated for detection and identification of common respiratory fungal pathogens, including aspergillus fumigatus, rhizopus microsporus, scedosporium apiospermum and fusarium solani. the limit of detect ...201222435876
Refresh
firstprev
12345678910...
nextlast
Displaying items 501 - 600 of 2435