| impact of fermented brown rice with aspergillus oryzae intake and concentrations of organochlorine pesticides in blood of humans from japan. | | 2006 | 16786444 |
| optimization of multienzyme production by two mixed strains in solid-state fermentation. | f(3) and f(4) strains of aspergillus niger were screened from five strains of fungi to produce multienzyme preparations (containing cellulase, hemicellulase, glucoamylase, pectinase, and acidic proteinase) as dietary supplementation. enzyme activities indicated that 1:4 (f(3) to f(4)) was the optimum mixture proportion, and 0.3% (w/w) was the preferable pitching rate. in bran mash containing 54.5% (w/w) water, f(3) and f(4) could produce the supplementation better when cultured 30 to 36 h at 30 ... | 2006 | 16802152 |
| proteomic methods applied to the analysis of immobilized biocatalysts. | methods adapted from proteomics can directly characterize proteins present in immobilized biocatalysts. complete hydrolysis followed by hplc analysis of tyr and phe estimates total protein bound, and is preferable to conventional difference methods, as tested with subtilisin carlsberg on silica. this new method shows that various treatments give quantitative desorption of proteins immobilized by adsorption. intact desorbed proteins may be analyzed by electrospray mass spectrometry. the candida a ... | 2006 | 16807923 |
| discovery, cloning and heterologous expression of secreted potato proteins reveal erroneous pre-mrna splicing in aspergillus oryzae. | a novel transposon assisted signal trapping (tast) technology, developed to specifically select only the secreted proteins, was used to discover novel extracellular plant proteins from solarium tuberosum infected with phytophthora infestans. analysis of 384 hits provided 191 p. infestans and s. tuberosum sequences of secreted proteins, with an approx. 2/3 of these originating from potato. subsequent screening for interesting genes was carried out using bioinformatics. a selected variety of the d ... | 2006 | 16814894 |
| rate of iodine volatilization and accumulation by filamentous fungi through laboratory cultures. | five strains of basidiomycetes (lentinula edodes, coprinus phlyctidosporus, hebeloma vinosophyllum, pleurotus ostreatus and agaricus bisporus), one strain of ascomycete (hormoconis resinae) and six strains of imperfect fungi (penicillium chrysogenum, penicillium roquefortii, cladosporium cladosporioides, alternaria alternata, aspergillus niger and aspergillus oryzae) were cultured in a liquid medium containing a radioactive iodine tracer ((125)i), and were tested for their abilities to volatiliz ... | 2006 | 16828143 |
| thermostability of native and pegylated myceliophthora thermophila laccase in aqueous and mixed solvents. | a commercial preparation of laccase (ec 1.10.3.2), cloned from myceliophthora thermophila and expressed in aspergillus oryzae (mtl), was purified and modified by conjugation with poly(ethylene glycol) (m(r) = 5000) and is labeled peg-mtl. native enzyme was found to have a molecular mass of 80 kda, as determined by gel filtration, and 110 kda, by sds-page. the oxidative dimerization of 2,6-dimethoxyphenol (dmp) to produce the corresponding dibenzoquinone was catalyzed by mtl in a manner comparabl ... | 2006 | 16848420 |
| aovps24, a homologue of vps24, is required for vacuolar formation which could maintain proper growth and development in the filamentous fungus aspergillus oryzae. | vps24 (vacuolar protein sorting) is a component of escrt iii (endosomal sorting complex required for transport), which is required for the formation of mvb (multivesicular body). we have isolated the vps24 homologue gene, aovps24, from the filamentous fungus aspergillus oryzae, and analyzed the localization of aovps24 using egfp. aovps24 was localized in the cytoplasm and late endosome-like structures. furthermore, we constructed an aovps24 disruptant, which showed impaired growth, conidiation, ... | 2006 | 16857172 |
| an efficient two step purification and molecular characterization of beta-galactosidases from aspergillus oryzae. | beta-galactosidases (beta-d-galactoside-galactohydrolases (ec 3.2.1.23), lactases) are important industrial enzymes used for the hydrolysis of lactose from milk and milk whey. these enzymes are produced by different organisms and purified by multi-step procedures. the multi-step purification schemes are cost and time ineffective which can also lead to poor yield, denaturation and loss of enzymatic activity. in our study, extracellular beta-galactosidase from mutant strain aspergillus oryzaeh26-1 ... | 2006 | 16865665 |
| possible involvement of pleiomorphic vacuolar networks in nutrient recycling in filamentous fungi. | morphological analyses of vacuoles in filamentous fungi in the past decade have led to the remarkable finding that they are highly pleiomorphic organelles. among them, tubular vacuoles have been implicated in nutrient transport between hyphal tips and the host plant surface in mycorrhizal fungi. however, a series of works suggested the presence of tubular vacuoles in other fungi that are not mycorrhizal, including aspergillus oryzae, hinting at more general roles of the tubular vacuoles. recentl ... | 2006 | 16874107 |
| development of a versatile expression plasmid construction system for aspergillus oryzae and its application to visualization of mitochondria. | we report here a development of the multisite gateway(tm)-based versatile plasmid construction system applicable for the rapid and efficient preparation of aspergillus oryzae expression plasmids. this system allows the simultaneous connection of the three dna fragments inserted in entry clones along with a destination vector in a defined order and orientation. we prepared a variety of entry clones and destination vectors containing promoters, genes encoding carrier-proteins and fusion tags, and ... | 2006 | 16880596 |
| functional analysis of the atg8 homologue aoatg8 and role of autophagy in differentiation and germination in aspergillus oryzae. | autophagy is a well-known degradation system, induced by nutrient starvation, in which cytoplasmic components and organelles are digested via vacuoles/lysosomes. recently, it was reported that autophagy is involved in the turnover of cellular components, development, differentiation, immune responses, protection against pathogens, and cell death. in this study, we isolated the atg8 gene homologue aoatg8 from the filamentous fungus aspergillus oryzae and visualized autophagy by the expression of ... | 2006 | 16896216 |
| substrate and positional specificity of feruloyl esterases for monoferuloylated and monoacetylated 4-nitrophenyl glycosides. | 4-nitrophenyl glycosides of 2-, 3-, and 5-o-(e)-feruloyl- and 2- and 5-o-acetyl-alpha-l-arabinofuranosides and of 2-, 3-, and 4-o-(e)-feruloyl- and 2-, 3- and 4-o-acetyl-beta-d-xylopyranosides, compounds mimicking natural substrates, were used to investigate substrate and positional specificity of type-a, -b, and -c feruloyl esterases. all the feruloyl esterases behave as true feruloyl esterases showing negligible activity on sugar acetates. type-a enzymes, represented by anfaea from aspergillus ... | 2007 | 16901567 |
| expression of aspergillus hemoglobin domain activities in aspergillus oryzae grown on solid substrates improves growth rate and enzyme production. | dna fragments coding for hemoglobin domains (hbd) were isolated from aspergillus oryzae and aspergillus niger. the hbd activities were expressed in a. oryzae by introduction of hbd gene fragments under the control of the promoter of the constitutively expressed gpda gene. in the transformants, oxygen uptake was significantly higher, and during growth on solid substrates the developed biomass was at least 1.3 times higher than that of the untransformed wild-type strain. growth rate of the hbd-act ... | 2006 | 16927259 |
| enhanced antioxidative activity of soybean koji prepared with various filamentous fungi. | in the present study, soybean koji fermented with various gras filamentous fungi, including aspergillus sojae bcrc 30103, aspergillus oryzae bcrc 30222, aspergillus awamori, actinomucor taiwanensis and rhizopus sp. these organisms are commonly used as starters in the fermentation of many traditional, oriental food products. the growth of starter organisms, total phenolic content, and antioxidative activities of the methanol extract of these kojis are compared with specific reference to alpha-dip ... | 2006 | 16943061 |
| a novel gh43 alpha-l-arabinofuranosidase from humicola insolens: mode of action and synergy with gh51 alpha-l-arabinofuranosidases on wheat arabinoxylan. | a novel alpha-l-arabinofuranosidase (alpha-araf) belonging to glycoside hydrolase (gh) family 43 was cloned from humicola insolens and expressed in aspergillus oryzae. (1)h-nmr analysis revealed that the novel gh43 enzyme selectively hydrolysed (1-->3)-alpha-l-arabinofuranosyl residues of doubly substituted xylopyranosyl residues in arabinoxylan and in arabinoxylan-derived oligosaccharides. the optimal activity of the cloned enzyme was at ph 6.7 and 53 degrees c. two other novel alpha-l-arabinof ... | 2006 | 16944135 |
| impact of aspergillus oryzae genomics on industrial production of metabolites. | aspergillus oryzae is used extensively for the production of the traditional japanese fermented foods sake (rice wine), shoyu (soy sauce), and miso (soybean paste). in recent years, recombinant dna technology has been used to enhance industrial enzyme production by a. oryzae. recently completed genomic studies using expressed sequence tag (est) analyses and whole-genome sequencing are quickly expanding the industrial potential of the fungus in biotechnology. genes that have been newly discovered ... | 2006 | 16944282 |
| chemometric analysis of in-line multi-wavelength fluorescence measurements obtained during cultivations with a lipase producing aspergillus oryzae strain. | the filamentous fungus, aspergillus oryzae, was cultivated in batch and fed-batch cultivations in order to investigate the use of multi-wavelength fluorescence for monitoring course of events during filamentous fungi cultivations. the a. oryzae strain applied expressed a fungal lipase from thermomyces lanuginosus. spectra of multi-wavelength fluorescence were collected every 5 min with the bioview system (delta, denmark) and both explorative and predictive models, correlating the fluorescence da ... | 2007 | 16948165 |
| first report of a xylose-specific lectin with potent hemagglutinating, antiproliferative and anti-mitogenic activities from a wild ascomycete mushroom. | from fresh fruiting bodies of the wild ascomycete mushroom (xylaria hypoxylon) a lectin with n-terminal sequence resemblance to a part of aspergillus oryzae genome and only slight similarity to fungal immunomodulatory protein from the mushroom flammulina velutipes was isolated. the protocol comprised extraction with water, precipitation from the aqueous extract using 80% saturated (nh(4))(2)so(4), ion exchange chromatography on deae-cellulose and cm-cellulose, and then gel filtration by fast pro ... | 2006 | 16952421 |
| preliminary studies on production of extracellular lipase by an isolate from soil : aspergillus flavus oryzae. | in our routine screening programme, using agar diffusion assay method, lipolytic activity was detected around a colony of a fungus. the fungus was isolated from a soil sample which was brought from a location near oil-mill. this lipolytic fungus was then identified to belong to aspergillus flavus oryzae. a medium was then formulated and optimized which would not only support good growth but also would yield good extracellular lipolytic activity. it was observed that a conventional carbohydrate-p ... | 1998 | 16961201 |
| chemical components, palatability, antioxidant activity and antimutagenicity of oncom miso using a mixture of fermented soybeans and okara with neurospora intermedia. | the enzyme activities of aspergillus oryzae on koji (malted rice) and neurospora intermedia on s-oncom and o-oncom (fermented soybeans and okara with n. intermedia, respectively) were compared. the major enzymes of n. intermedia were different from those of a. oryzae, and the enzyme activities of o-oncom were extremely higher than those of s-oncom. s5-miso, s10-miso and s9o1-miso replacing 50% or 100% of steamed soybeans with s-oncom or a 9 : 1 mixture of s-oncom and o-oncom, respectively, were ... | 2006 | 16967767 |
| a traditional japanese medicine mitigates tnbs-induced colitis in rats. | differences in dietary habits may be one of the reasons that the incidence of inflammatory bowel disease has remained lower in japan than in western countries. we investigated whether a traditional japanese medicine (strong wakamto), based on aspergillus oryzae koji, would exert any effect on experimental colitis in rats. | 2006 | 16990203 |
| innovative effect of illite on improved microbiological conversion of l-tyrosine to 3,4 dihydroxy phenyl l-alanine (l-dopa) by aspergillus oryzae me2 under acidic reaction conditions. | in the present investigation, the previous ultraviolet irradiated mutant strain of aspergillus oryzae uv-7 was further improved in terms of 3,4 dihydroxy phenyl l-alanine (l-dopa) activity after chemical mutagenesis through 1-methyl 3-nitro 1-nitroso guanidine (mnng = 250-1500 microg/ml) treatment (0-30 min). among several mutant variants, the one that produced a larger amount of l-dopa from l-tyrosine was designated to as me2 and it was made 2-deoxy-d-glucose-resistant by growing it at various ... | 2006 | 17039388 |
| evaluation of certain food additives. | this report represents the conclusions of a joint fao/who expert committee convened to evaluate the safety of various food additives, with a view to recommending acceptable daily intakes (adis) and to prepare specifications for the identity and purity of food additives. the first part of the report contains a general discussion of the principles governing the toxicological evaluation of food additives (including flavouring agents), assessments of intake, and the establishment and revision of spe ... | 2006 | 17069402 |
| in vivo expression of udp-n-acetylglucosamine: alpha-3-d-mannoside beta-1,2-n-acetylglucosaminyltransferase i (gnt-1) in aspergillus oryzae and effects on the sugar chain of alpha-amylase. | udp-n-acetylglucosamine: alpha-3-d-mannoside beta-1,2-n-acetylglucosaminyltransferase i (gnt-i) is an essential enzyme in the conversion of high mannose type oligosaccharide to the hybrid or complex type. the full length of the rat gnt-i gene was expressed in the filamentous fungus aspergillus oryzae. a microsomal preparation from a recombinant fungus (strain ng) showed gnt-i activity that transferred n-acetylglucosamine residue to acceptor heptaose, man(5)glcnac(2). the n-linked sugar chain of ... | 2006 | 17090929 |
| effects of a dietary aspergillus oryzae extract containing alpha-amylase activity on performance and carcass characteristics of finishing beef cattle. | three experiments were conducted to examine the effects of an aspergillus oryzae extract containing alpha-amylase activity on performance and carcass characteristics of finishing beef cattle. in exp. 1, 120 crossbred steers were used in a randomized complete block design to evaluate the effects of roughage source (alfalfa hay vs. cottonseed hulls) and supplemental alpha-amylase at 950 dextrinizing units (du)/kg of dm. significant roughage source x alpha-amylase interactions (p < 0.05) were obser ... | 2007 | 17121970 |
| substrate specificity of n-acetylhexosaminidase from aspergillus oryzae to artificial glycosyl acceptors having various substituents at the reducing ends. | the substrate specificity of n-acetylhexosaminidase (e.c. 3.2.1.51) from aspergillus oryzae was examined using p-nitrophenyl 6-o-sulfo-n-acetyl-beta-d-glucosaminide (6-o-sulfo-glcnac-o-pnp) as the glycosyl donor and a series of beta-d-glucopyranosides and n-acetyl-beta-d-glucosaminides with variable aglycons at the anomeric positions as the acceptors. when beta-d-glucopyranosides with methyl (ch(3)), allyl (ch(2)chch(2)), and phenyl (c(6)h(5)) groups at the reducing end were used as the acceptor ... | 2007 | 17145046 |
| function analysis of stea homolog in aspergillus oryzae. | the asexual ascomycete aspergillus oryzae has an stea homolog in its genome. the stea homolog of a. oryzae was transcribed in the wild-type strain but stea disruption did not affect the phenotype of the disruptant strain. on the other hand, the stea-overexpressing strain showed the restriction of vegetative hyphal growth and conidiation, and the formation of balloon-shaped structures. the restriction of vegetative hyphal growth and conidiation were partially rescued by high osmolarity. in additi ... | 2007 | 17178246 |
| autophagy during conidiation and conidial germination in filamentous fungi. | filamentous fungi form aerial hyphae on solid medium, and some of these differentiate into conidiophores for asexual sporulation (conidiation). in the filamentous deuteromycete, aspergillus oryzae, aerial hyphae are formed from the foot cells and some differentiate into conidiophores, which are composed of vesicles, phialides and conidia. recently, we isolated the yeast atg8 gene homologue aoatg8 from a. oryzae, and visualized autophagy by the expression of an egfp (enhanced green fluorescent pr ... | 2007 | 17183223 |
| fungal strains isolated from cork stoppers and the formation of 2,4,6-trichloroanisole involved in the cork taint of wine. | cork taint is mainly due to 2,4,6-trichloroanisole (tca) produced through the activity of undesirable fungal strains. we observed that cfu mould number in tca-containing stoppers was not quantitatively different to that of the stoppers not containing tca (ca. 10(5)cfu/g). in contrast more fungi diversity was observed in tca-containing stoppers. penicillium spp (penicillium chrysogenum, penicillium glabrum), aspergillus spp (aspergillus niger and aspergillus oryzae), chrysonilia sitophila, mucor ... | 2007 | 17188205 |
| identification of genes from aspergillus oryzae that are preferentially expressed in membrane-surface liquid culture. | we identified 22 genes from aspergillus oryzae that are preferentially expressed in membrane-surface liquid culture (mslc), among which ser/thr protein kinase (aopk1) and phosphatase (aoppt) genes were cloned. we also revealed that aopk1 encodes a protein with an n-terminal sequence 150 amino acid residues longer than that predicted from the registered sequence in genbank. | 2006 | 17189178 |
| gene silencing by rna interference in the koji mold aspergillus oryzae. | we found the orthologous genes required for rna interference (rnai) in the aspergillus oryzae genome database, and constructed a set of tools for gene silencing using rnai in a. oryzae. this system utilizes compatible restriction enzyme sites so that only a single target gene fragment is required to create the hairpin rna cassette. for ease of handling, we also separated the construction of the hairpin rna cassette for the target gene from its subsequent introduction into the expression vector. ... | 2007 | 17213655 |
| development of recombinant aspergillus oryzae whole-cell biocatalyst expressing lipase-encoding gene from candida antarctica. | to expand the industrial applications of candida antarctica lipase b (calb), we developed aspergillus oryzae whole-cell biocatalyst expressing the lipase-encoding gene from c. antarctica. a. oryzae niad300, which was derived from the wild type strain rib40, was used as the host strain. the calb gene was isolated from c. antarctica cbs6678 and expression plasmids were constructed with and without secretion signal peptide. the lipase gene was expressed under the control of improved glaa and pno-81 ... | 2007 | 17225093 |
| nitrocellulose as a general tool for fungal slide mounts. | | 2007 | 17251407 |
| profiling of glycosidase activities using coumarin-conjugated glycoside cocktails. | glycosidases are a large subgroup of carbohydrate-processing enzymes that hydrolytically cleave the glycosidic bond. glycans formed by the action of glycosidases are involved in various biological processes. genetic abnormalities in glycosidases are associated with inherited diseases. thus, characterization of the catalytic activities of glycosidases is of great importance. herein, we describe a simple and rapid approach for determining glycosidase activity profiles using coumarin-conjugated gly ... | 2007 | 17256948 |
| expression of aspergillus oryzae phytase gene in aspergillus oryzae rib40 niad(-). | aspergillus oryzae rib40 niad(-) was transformed using a plasmid constructed with the a. oryzae phytase gene and pnan8142 vector. the culture broth of the transformant, which was grown in a medium containing starch as a carbon source and polyvinylpyrrolidone showed phytase activity of a maximum of 2.0 units ml(-1) at 37 degrees c, ph 5.5. | 2006 | 17270723 |
| high-throughput genotyping of filamentous fungus aspergillus oryzae based on colony direct polymerase chain reaction. | high-throughput genotyping of aspergillus oryzae was achieved using an fta card for the extraction of a genomic dna template for polymerase chain reaction from a fungal colony growing on an agar plate. this method was then applied to detect other fungal species from agar slants and food materials. this method offers a convenient tool for the genotyping of filamentous fungi without using an organic solvent or specialized equipment. | 2006 | 17270725 |
| the antifungal protein afp from aspergillus giganteus inhibits chitin synthesis in sensitive fungi. | the antifungal protein afp from aspergillus giganteus is highly effective in restricting the growth of major human- and plant-pathogenic filamentous fungi. however, a fundamental prerequisite for the use of afp as an antifungal drug is a complete understanding of its mode of action. in this study, we performed several analyses focusing on the assumption that the chitin biosynthesis of sensitive fungi is targeted by afp. here we show that the n-terminal domain of afp (amino acids 1 to 33) is suff ... | 2007 | 17277210 |
| calcium alginate entrapped preparations of aspergillus oryzae beta galactosidase: its stability and applications in the hydrolysis of lactose. | insoluble concanavalin a-beta galactosidase complex was obtained by using jack bean extract and this complex was crosslinked with glutaraldehyde, in order to maintain the integrity of complex in the presence of its substrate or products. concanavalin a-beta galactosidase complex retained 92% of the initial enzyme activity whereas crosslinked complex showed 88% activity. entrapment of concanavalin a-beta galactosidase complex into calcium alginate beads provided suitability to use this preparatio ... | 2007 | 17298841 |
| temperature impacts the multiple attack action of amylases. | the action pattern of several amylases was studied at 35, 50, and 70 degrees c using potato amylose, a soluble (red starch) and insoluble (cross-linked amylose) chromophoric substrate. with potato amylose as substrate, bacillus stearothermophilus alpha-amylase (bsta) and porcine pancreatic alpha-amylase displayed a high degree of multiple attack (dma, i.e., the number of bonds broken during the lifetime of an enzyme-substrate complex minus one), the fungal alpha-amylase from aspergillus oryzae a ... | 2007 | 17309295 |
| [blood pressure lowering tripeptides derived from milk protein]. | fermentation of milk by the lactobacillus helveticus lbk-16h or hydrolysis of casein by protease of aspergillus oryzae generates the tripeptide casokinines val-pro-pro and ile-pro-pro. these peptides inhibit the kininase ii (also known as angiotensin converting enzyme, ace). daily intake of these peptides in sufficient amounts in milk, fruit vegetable drinks or pills slightly decreases the blood pressure in hypertensive patients. the currently available milk peptides decrease the blood pressure ... | 2007 | 17323290 |
| biotransformation of piceid in polygonum cuspidatum to resveratrol by aspergillus oryzae. | biotransformation of piceid in polygonum cuspidatum to resveratrol by aspergillus oryzae was investigated in this study. resveratrol is widely used in medicine, food, and cosmetic because of its pharmacological properties. however, it has a much lower content in plants compared with its glucoside piceid, which has a much lower bioavailability. traditionally, the aglycone is acquired by acid or enzymatic hydrolysis of its glucoside, but the violent condition and the acid pollution in hydrolytic r ... | 2007 | 17333175 |
| genomics of aspergillus oryzae. | the genome sequence of aspergillus oryzae, a fungus used in the production of the traditional japanese fermentation foods sake (rice wine), shoyu (soy sauce), and miso (soybean paste), has revealed prominent features in its gene composition as compared to those of saccharomyces cerevisiae and neurospora crassa. the a. oryzae genome is extremely enriched with genes involved in biomass degradation, primary and secondary metabolism, transcriptional regulation, and cell signaling. even compared to t ... | 2007 | 17341818 |
| chemopreventive effect of fermented brown rice and rice bran on 4-nitroquinoline 1-oxide-induced oral carcinogenesis in rats. | the preventive effects of the dietary administration of brown rice and rice bran fermented with aspergillus oryzae (fbra) on oral carcinogenesis induced by 4-nitroquinoline 1-oxide (4-nqo) were investigated in male f344 rats. at 7 weeks of age, the animals were given 20 ppm 4-nqo in their drinking water for 8 weeks to induce tongue neoplasms. groups of rats were fed diets containing 5 or 10% fbra during the initiation or postinitiation phases of the 4-nqo-induced oral carcinogenesis. the other g ... | 2007 | 17342331 |
| optimization of ellagic acid production from ellagitannins by co-culture and correlation between its yield and activities of relevant enzymes. | aspergillus oryzae was co-cultured with trichoderma reesei using acorn cups extract containing up to 62% ellagitannins as substrate to produce ellagic acid with relatively high levels of ellagitannin acyl hydrolase, cellulase and xylanase. ellagitannins concentration, initial ph, t. reesei and a. oryzae during the fermentation were identified as important process parameters effecting ellagic acid accumulation and the enzymes syntheses. these parameters were optimized by uniformity design to dete ... | 2008 | 17363241 |
| [expression of endopolygalacturonase a of aspergillus oryzae in escherichia coli]. | pectinases are mainly used in the food industry to clarify fruit juices and wine, improve oil extraction, remove the peel from the citrus fruit, increase the firmness of some fruits and degum fibres. the filamentous fungus aspergillus oryzae, used for the production of traditional fermented foods, only could produce less pectinases under general conditions. so far only a few of pgs expressed in yeast or e. coli were reported but they did not show higher activity. the cdna of mature pga (without ... | 2007 | 17366896 |
| production of dye-decolorizing peroxidase (rdyp) from complex substrates by repeated-batch and fed-batch cultures of recombinant aspergillus oryzae. | we examined production levels of dye-decolorizing peroxidase (rdyp) by recombinant aspergillus oryzae using wheat bran and rice bran powders in repeated-batch and fed-batch cultures. similar average rdyp productivities were observed in repeated-batch cultures using wheat bran powder and rice bran powder. average rdyp productivities in fed-batch cultures were slightly lower than those in repeated-batch cultures. the rdyp production was affected by the addition of k(2)hpo(4) in the repeated-batch ... | 2007 | 17368394 |
| screening of beta-fructofuranosidase-producing microorganisms and effect of ph and temperature on enzymatic rate. | seventeen different strains of filamentous fungi were grown in batch cultures to compare their abilities for the production of beta-fructofuranosidase. three of them, aspergillus oryzae ipt-301, aspergillus niger atcc 20611 and strain ipt-615, showed high production with total fructosyltransferase activity higher than 12,500 units l(-1). in addition, the beta-fructofuranosidases of those strains have a high fructosyltransferase activity-to-hydrolytic activity ratio. the temperature and ph effect ... | 2007 | 17375295 |
| carbohydrate binding specificity of a fucose-specific lectin from aspergillus oryzae: a novel probe for core fucose. | the alpha1,6-fucosyl residue (core fucose) of glycoproteins is widely distributed in mammalian tissues and is altered under pathological conditions. a probe that specifically detects core fucose is important for understanding the role of this oligosaccharide structure. aleuria aurantia lectin (aal) and lens culimaris agglutinin-a (lca) have been often used as carbohydrate probes for core fucose in glycoproteins. here we show, by using surface plasmon resonance (spr) analysis, that aspergillus or ... | 2007 | 17383961 |
| the beta-1,3-exoglucanase gene exga (exg1) of aspergillus oryzae is required to catabolize extracellular glucan, and is induced in growth on a solid surface. | the biological role of exga (exg1), a secretory beta-1,3-exoglucanase of aspergillus oryzae, and the expression pattern of the exga (exg1) gene were analyzed. the exga disruptant and the exga-overexpressing mutant were constructed, and phenotypes of both mutants were compared. higher mycelial growth rate and conidiation efficiency were observed for the exga-overexpressing mutant than for the exga disruptant when beta-1,3-glucan was supplied as sole carbon source. on the other hand, no difference ... | 2007 | 17420593 |
| phosphorylation of the aspergillus oryzae woronin body protein, aohex1, by protein kinase c: evidence for its role in the multimerization and proper localization of the woronin body protein. | woronin body, a specialized peroxisome, is a unique organelle involved in septal pore sealing and protecting filamentous fungus from excessive cytoplasmic bleeding. we recently characterized the aohex1 gene encoding the major protein of the woronin body in the fungus aspergillus oryzae. although three-dimensional microscopy revealed plugging of the septal pore by woronin body, the mechanism of its formation remains unknown. we report here a reduction in the oligomeric forms (dimeric and tetramer ... | 2007 | 17441786 |
| individual and combined effects of physicochemical parameters on ellagitannin acyl hydrolase and ellagic acid production from ellagitannin by aspergillus oryzae. | the individual and interactive effects of physicochemical parameters on ellagitannin acyl hydrolase activity and ellagic acid production by aspergillus oryzae using ellagitannins from acorn fringe of oak as substrate were studied. ellagitannins concentration, incubation time were identified as important physicochemical parameters influencing the enzyme synthesis and the production accumulation, and the substrate concentration with initial ph was determined to has an interactive effect on the enz ... | 2007 | 17450459 |
| aspergillus oryzae peritonitis in capd: case report and review of the literature. | fungal peritonitis is a rare, but serious, complication of continuous ambulatory peritoneal dialysis (capd). we report a case of peritonitis caused by aspergillus oryzae in a man on capd therapy who was treated successfully with amphotericin b and caspofungin, followed by itraconazole and removal of the peritoneal catheter. a oryzae was identified by using sequence analysis of the ribosomal dna genes. of 10 reported cases since 2003, the mortality rate was 30%. removal of the capd catheter and s ... | 2007 | 17472853 |
| tpr domain of ser/thr phosphatase of aspergillus oryzae shows no auto-inhibitory effect on the dephosphorylation activity. | a ser/thr phosphatase gene cloned from aspergillus oryzae, aoppt, revealed that the tetratricopeptide repeat (tpr) and catalytic domains of the full-length aoppt are located at the n- and c-terminal regions, respectively, similar to those of human ser/thr phosphatase 5 (pp5) and yeast ppt1. four different regions of aoppt, namely, a full-length polypeptide, the catalytic domain, the catalytic domain plus c-terminal 15 amino-acid residues and the tpr domain were expressed in escherichia coli and ... | 2007 | 17475320 |
| improvement of the antitumor activity of black currant polysaccharide by an enzymatic treatment. | a polysaccharide-rich substance isolated from black currant, named cassis polysaccharide (caps), was partially digested with beta-galactosidase from aspergillus oryzae and its immunostimulatory activity was investigated. the in vitro cytokine-inducing effect of caps on raw264 cells was gradually decreased along with lowering of the average mw of caps. in vivo, partially digested caps with a mean mw of approximately 20,000 showed the most potent antitumor activity against ehrlich carcinoma in mic ... | 2007 | 17485844 |
| synthesis of p-nitrophenyl sulfated disaccharides with beta-d-(6-sulfo)-glcnac units using beta-n-acetylhexosaminidase from aspergillus oryzae in a transglycosylation reaction. | when alpha-d-glcnac-oc(6)h(4)no(2) -p and beta-d-(6-sulfo)-glcnac-oc(6)h(4)no(2)-p (2) were used as substrates, beta-n-acetylhexosaminidase from aspergillus oryzae transferred the beta-d-(6-sulfo)-glcnac(unit from 2 to alpha-d-glcnac-oc(6)h(4)no(2) -p to afford beta-d-(6-sulfo)-glcnac-(1-->4)-alpha-d-glcnac-oc(6)h(4)no(2)-p (3) in a yield of 94% based on the amount of donor, 2, added. beta-d-(6-sulfo)-glcnac-(1-->4)-alpha-d-glc-oc(6)h(4)no(2)-p (4) was obtained with alpha-d-glc-oc(6)h(4)no(2) -p ... | 2007 | 17492477 |
| effects of fermented soybean meal on digestive enzyme activities and intestinal morphology in broilers. | the experiment was performed to compare the effects of fermented soybean meal (fermented with aspergillus oryzae 3.042, fsbm) and soybean meal on digestive enzyme activities and intestinal morphology in broilers. three hundred twenty 1-d-old ross x ross male broiler chicks were randomly allocated into 2 dietary treatments for a 6-wk feeding trial, including 0- to 21-d and 21- to 42-d periods. at the end of each stage, 8 broilers of each treatment were killed, and pancreas, small intestine digest ... | 2007 | 17495085 |
| physico-chemical and microbiological analyses of fermented corn cob, rice bran and cowpea husk for use in composite rabbit feed. | an experiment was conducted to evaluate the effect of fermentation on the proximate composition of corn cob, rice bran and cowpea husk for use in composite rabbit feed formulations. the test ingredients were moistened with tap water and allowed to ferment naturally at room temperature. during fermentation, samples of the fermenting materials were extracted at zero, 24 and 48 h for physico-chemical and microbiological analyses using standard procedures. the microorganisms associated with the ferm ... | 2008 | 17502134 |
| structure of the dimeric n-glycosylated form of fungal beta-n-acetylhexosaminidase revealed by computer modeling, vibrational spectroscopy, and biochemical studies. | fungal beta-n-acetylhexosaminidases catalyze the hydrolysis of chitobiose into its constituent monosaccharides. these enzymes are physiologically important during the life cycle of the fungus for the formation of septa, germ tubes and fruit-bodies. crystal structures are known for two monomeric bacterial enzymes and the dimeric human lysosomal beta-n-acetylhexosaminidase. the fungal beta-n-acetylhexosaminidases are robust enzymes commonly used in chemoenzymatic syntheses of oligosaccharides. the ... | 2007 | 17509134 |
| aspergillus flavus: human pathogen, allergen and mycotoxin producer. | aspergillus infections have grown in importance in the last years. however, most of the studies have focused on aspergillus fumigatus, the most prevalent species in the genus. in certain locales and hospitals, aspergillus flavus is more common in air than a. fumigatus, for unclear reasons. after a. fumigatus, a. flavus is the second leading cause of invasive aspergillosis and it is the most common cause of superficial infection. experimental invasive infections in mice show a. flavus to be 100-f ... | 2007 | 17526826 |
| analysis of expressed sequence tags from the fungus aspergillus oryzae cultured under different conditions. | we performed random sequencing of cdnas from nine biologically or industrially important cultures of the industrially valuable fungus aspergillus oryzae to obtain expressed sequence tags (ests). consequently, 21 446 raw ests were accumulated and subsequently assembled to 7589 non-redundant consensus sequences (contigs). among all contigs, 5491 (72.4%) were derived from only a particular culture. these included 4735 (62.4%) singletons, i.e. lone ests overlapping with no others. these data showed ... | 2007 | 17540709 |
| a new mechanism regulating the initiation of allergic airway inflammation. | the earliest immune events induced by allergens are poorly understood, yet are likely essential to understanding how allergic inflammation is established. | 2007 | 17544098 |
| radiobiological investigations of soft x-rays near carbon, nitrogen, oxygen k-shell edges on aspergillus oryzae spores. | soft x-rays at carbon, nitrogen, oxygen k-shell edges have special radiobiological effects. using aspergillus oryzae spores as sample, the radiation effects of soft x-rays near the k-shell edges of c, n and o elements from synchrotron radiation were investigated. also the dose depositions of different x-ray energies in spore were discussed. at the same time, the spores were irradiated by gamma rays from 60co and relative biological effects were compared with those produced by soft x-rays. the re ... | 2008 | 17545664 |
| change in turnover capacity of crude recombinant dye-decolorizing peroxidase (rdyp) in batch and fed-batch decolorization of remazol brilliant blue r. | decolorization of the representative anthraquinone dye, remazol brilliant blue r (rbbr) was assessed to determine the practical potential of crude recombinant dye-decolorizing peroxidase generated by aspergillus oryzae (rdyp) in term of turnover capacity of rdyp. the turnover capacity, defined as the milligram of rbbr decolorized per unit of rdyp inactivated over the catalytic life time of rdyp, was quantified under condition by h(2)o(2) -mediated rdyp inactivation. in batch culture, equimolar b ... | 2007 | 17569040 |
| comparative profiles of alpha-amylase production in conventional tray reactor and growtek bioreactor. | growtek bioreactor was used as modified solid-state fermentor to circumvent many of the problems associated with the conventional tray reactors for solid-state fermentation (ssf). aspergillus oryzae ifo-30103 produced very high levels of alpha-amylase by modified solid-state fermentation (mssf) compared to ssf carried out in enamel coated metallic trays utilizing wheat bran as substrate. high alpha-amylase yield of 15,833 u g(-1) dry solid in mssf were obtained when the fungus were cultivated at ... | 2007 | 17573554 |
| the promoter activity of isovaleryl-coa dehydrogenase-encoding gene (ivda) from aspergillus oryzae is strictly repressed by glutamic acid. | we cloned the isovaleryl-coa dehydrogenase (ivd)-encoding gene from aspergillus oryzae. the promoter of ivda was subjected to beta-glucuronidase (gus) reporter assays in which certain amino acids were used as a major carbon source. l-leucine most strongly induced gus-activity, while in the case of l-glutamate, significantly low activity was found, indicating that ivda transcription was strongly repressed by glutamic acid. | 2007 | 17587691 |
| systematic analysis of snare localization in the filamentous fungus aspergillus oryzae. | in spite of their great importance for both applied and basic biology, studies on vesicular trafficking in filamentous fungi have been so far very limited. here, we identified 21 genes, which might be a total set, encoding putative snare proteins that are key factors for vesicular trafficking, taking advantage of available whole genome sequence in the filamentous fungus aspergillus oryzae. the subsequent systematic analysis to determine the localization of putative snares using egfp-fused chimer ... | 2007 | 17590362 |
| microbial production of sensory-active miraculin. | miraculin (mcl), a tropical fruit protein, is unique in that it has taste-modifying activity to convert sourness to sweetness, though flat in taste at neutral ph. to obtain a sufficient amount of mcl to examine the mechanism involved in this sensory event at the molecular level, we transformed aspergillus oryzae by introducing the mcl gene. transformants were expressed and secreted a sensory-active form of mcl yielding 2 mg/l. recombinant mcl resembled native mcl in the secondary structure and t ... | 2007 | 17592723 |
| enhancement of substrate recognition ability by combinatorial mutation of beta-glucosidase displayed on the yeast cell surface. | recently, in family 3 beta-glucosidase (bgl), the catalytically important asp nucleophile has been identified in the sdw segment of the sdwg sequence by site-directed mutagenesis. however, the details about the roles of each amino acid residue of the sdwg sequence have not been investigated. w293 of the sdw segment, which is the residue next to the nucleophile (d292) in family 3 bgl, is very important for hydrolytic reaction as a binder to a substrate. g294 of the sdwg sequence might play an imp ... | 2007 | 17602218 |
| the glucoamylase-encoding gene (glab) is expressed in solid-state culture with a low water content. | solid-state culture encourages high-level enzyme secretion by aspergillus oryzae. using the real-time quantitative reverse transcriptase-polymerase chain reaction, we confirmed that expression of the glucoamylase-encoding gene in a. oryzae cultured in solid-state culture depends on the water content of the culture. | 2007 | 17617703 |
| double disruption of the proteinase genes, tppa and pepe, increases the production level of human lysozyme by aspergillus oryzae. | in this study, we investigated the effects of proteinase gene disruption on heterologous protein production by aspergillus oryzae. the human lysozyme (hly) was selected for recombinant production as a model for the heterologous protein. a tandem hly construct fused with alpha-amylase (amyb) was expressed by a. oryzae in which the kex2 cleavage site was inserted at the upstream of hly. hly was successfully processed from amyb and produced in the medium. we performed a systematic disruption analys ... | 2007 | 17622525 |
| molecular cloning, and characterization of a modular acetyl xylan esterase from the edible straw mushroom volvariella volvacea. | a new volvariella volvacea gene encoding an acetyl xylan esterase (designated as vvaxe1) was cloned and expressed in pichia pastoris. the cdna contained an orf of 1047 bp encoding 349 amino acids with a calculated mass of 39 990 da. vvaxe1 is a modular enzyme consisting of an n-terminal signal peptide, a catalytic domain, and a cellulose-binding domain. the amino acid sequence of the enzyme exhibited a high degree of similarity to cinnamoyl esterase b from penicillium funiculosum, and acetyl xyl ... | 2007 | 17623028 |
| mutagenic and antimutagenic effects of methanol extracts of unfermented and fermented black soybeans. | in this study, solid fermentation of steamed black soybean with various gras (generally recognized as safe) filamentious-fungi including aspergillus awamori, aspergillus oryzae bcrc 30222, aspergillus sojae bcrc 30103, rhizopus azygosporus bcrc 31158 and rhizopus sp. no. 2 was performed. mutagenicity and antimutagenicity of the methanol extracts of unfermented and fermented steamed black soybeans against 4-nitroquinoline-n-oxide (4-nqo), a direct mutagen and benzo[a]pyrene (b[a]p), an indirect m ... | 2007 | 17628128 |
| development of an efficient production method for beta-mannosidase by the creation of an overexpression system in aspergillus aculeatus. | to develop an overexpression system in aspergillus aculeatus in order to establish an efficient overproduction method of beta-mannosidase (manb). | 2007 | 17651209 |
| [rapd analysis of aspergilli and its application in brewing industry]. | phylogenetic analysis of sixteen aspergilli was done by rapd technology, using aspergillus oryzae as3.951, aspergillus flavus gim3.18 and aspergillus sojae as3.495 as controls. first, genome dna of the sixteen test strains were prepared by improved extraction method, and their quality was verified by electrophoresis and spectrophotometry. they displayed an identical band (approximately 20 kb) in agarose gel electrophoresis, which conformed to the fact that these strains all belong to aspergillus ... | 2007 | 17672321 |
| iron chelated cyclic peptide, ferrichrysin, for oral treatment of iron deficiency: solution properties and efficacy in anemic rats. | ferrichrysin (fcy), which is produced by aspergillus oryzae and is present in foods used for human consumption, belongs to a group of hydroxamate siderophore ferric iron chelators. fcy (100 mg/ml) dissolves completely at both ph 2.0 and 7.0, being very stable at a wide range of ph, high temperatures and pressures, with little reactivity to dietary iron absorption inhibitors, phytic acid, tannic acid, and catechin. we studied the effect of fcy in male sprague-dawley rats with iron-deficiency anem ... | 2007 | 17685091 |
| light represses conidiation in koji mold aspergillus oryzae. | in the filamentous fungus aspergillus oryzae, there has been no report on photoreaction. here we investigated the effect of light in a. oryzae and found that conidiation was repressed by white light. this reaction is contrary to that of other aspergilli, which show abundant conidiation under light. moreover, red light also caused reduced conidiation. genome sequencing of a. oryzae indicated the existence of homologs of some light-related genes in other filamentous fungi. to approach the molecula ... | 2007 | 17690479 |
| high performance microbiological transformation of l-tyrosine to l-dopa by yarrowia lipolytica nrrl-143. | the 3,4-dihydroxy phenyl l-alanine (l-dopa) is a drug of choice for parkinson's disease, controlling changes in energy metabolism enzymes of the myocardium following neurogenic injury. aspergillus oryzae is commonly used for l-dopa production; however, potential improvements in ease of handling, growth rate and environmental impact have led to an interest in exploiting alternative yeasts. the two important elements required for l-dopa production are intracellular tyrosinases (thus pre-grown yeas ... | 2007 | 17705832 |
| indirect enzyme-antibody sandwich enzyme-linked immunosorbent assay for quantification of taxi and xip type xylanase inhibitors in wheat and other cereals. | to quantify triticum aestivum xylanase inhibitor (taxi) and xylanase inhibiting protein (xip) type proteins in cereals in general and wheat ( t. aestivum) in particular, a robust enzyme-linked immunosorbent assay (elisa) using an uncommon enzyme-antibody sandwich format was developed. bacillus subtilis glycoside hydrolase family (gh) 11 and aspergillus oryzae gh 10 xylanases were selected for coating elisa plate wells to capture taxi and xip, respectively, prior to probing with antibodies. the d ... | 2007 | 17715986 |
| aggregation of endosomal-vacuolar compartments in the aovps24-deleted strain in the filamentous fungus aspergillus oryzae. | previously, we found that deletion of aovps24, an ortholog of saccharomyces cerevisiae vps24, that encodes an escrt (endosomal sorting complex required for transport)-iii component required for late endosomal function results in fragmented and aggregated vacuoles. although defective late endosomal function is likely responsible for this phenotype, critical lack of our knowledge on late endosomes in filamentous fungi prevented us from further characterization. in this study, we identified late en ... | 2007 | 17719006 |
| longevity in spores of aspergillus oryzae and rhizopus nigricans. | | 1923 | 17774267 |
| purification, characterization, and substrate specificity of a glucoamylase with steroidal saponin-rhamnosidase activity from curvularia lunata. | it has been previously reported that a glucoamylase from curvularia lunata is able to hydrolyze the terminal 1,2-linked rhamnosyl residues of sugar chains at c-3 position of steroidal saponins. in this work, the enzyme was isolated and identified after isolation and purification by column chromatography including gel filtration and ion-exchange chromatography. analysis of protein fragments by maldi-tof/tof proteomics analyzer indicated the enzyme to be 1,4-alpha-d-glucan glucohydrolase ec 3.2.1. ... | 2007 | 17823796 |
| modifying effects of fermented brown rice on fecal microbiota in rats. | brown rice fermented by aspergillus oryzae (fbra) is a fiber-rich food. effects of dietary administration of fbra on rat fecal microbiota composition were examined. male wistar rats were fed a basal diet or a 5% fbra- or 10% fbra-containing diet, and fecal microbiota was analyzed by culture and terminal-restriction fragment length polymorphism (t-rflp) analysis. the viable cell number of lactobacilli significantly increased after feeding 10% fbra diet for 3 weeks compared with that in the basal ... | 2007 | 17826198 |
| utilization of acorn fringe for ellagic acid production by aspergillus oryzae and endomyces fibuliger. | conversion of acorn fringe extract into ellagic acid production by aspergillus oryzae and endomyces fibuliger were investigated. the results showed that ellagic acid production was maximized when co-fermentation of the two fungi was performed at 30 degrees c and ph 5.0 with 5.7 g/l of initial substrate concentration, which were close to the optimal values for both fungi to yield an appropriate consortium of hydrolytic enzymes. meanwhile, it was found that the co-fermentation could compensate the ... | 2008 | 17826988 |
| utilization of agricultural residues for poly(3-hydroxybutyrate) production by halomonas boliviensis lc1. | utilization of cheap and readily available agricultural residues as cheap carbon sources for poly(3-hydroxybutyrate) (phb) production by halomonas boliviensis. | 2008 | 17887984 |
| fungal-stressed germination of black soybeans leads to generation of oxooctadecadienoic acids in addition to glyceollins. | microbial-stressed germination of black soybeans leads to generation of a group of oxylipins, oxooctadecadienoic acids (kodes, including 13- z, e-kode, 13- e, e-kode, 9- e, z-kode, and 9- e, e-kode), and their respective glyceryl esters in addition to glyceollins, a known phytoalexins present in wild and fungi-infected soybeans. four fungi, aspergillus niger, aspergillus oryzae, rhizopus oligosporus, and white rice yeast ( aspergillus niger wry), were applied to compare their efficiency on induc ... | 2007 | 17892258 |
| fermentation as a bio-process to obtain functional soybean flours. | the effect of fermentation on the antioxidant compounds [vitamins c and e, total phenolic compounds (tpc), and reduced glutathione (gsh)], and antioxidant capacity [superoxide anion scavenging activity (sod-like activity), peroxyl radical-trapping capacity (prtc), inhibition of phosphatidylcholine (pc) peroxidation, and trolox equivalent antioxidant capacity (teac)] of soybean (glycine max cv. merit) was studied. fermentation was carried out in solid state in cracked seeds inoculated with asperg ... | 2007 | 17907774 |
| production of fungal biomass protein using microfungi from winery wastewater treatment. | this study was carried out to investigate the production of fungal biomass protein (fbp) in treatment of winery wastewater using microfungi. three fungal strains, trichoderma viride webl0702, aspergillus niger webl0901 and aspergillus oryzae webl0401, were selected in terms of microbial capability for fbp production and cod reduction. t. viride appeared to be the best strain for fbp production due to high productivity and less nitrogen requirement. more than 5 g/l of fungal biomass was produced ... | 2008 | 17911010 |
| characterisation of 3-methylorcinaldehyde synthase (mos) in acremonium strictum: first observation of a reductive release mechanism during polyketide biosynthesis. | isolation and sequencing of a pks gene isolated from xenovulene-producing cultures of acremonium strictum indicated the presence of nt-, ks-, at-, pt-, c-met- and r-domains; heterologous expression in aspergillus oryzae resulted in the production of 3-methylorcinaldehyde, demonstrating the role of the terminal reductase domain in product release. | 2007 | 17912413 |
| marked production of ginsenosides rd, f2, rg3, and compound k by enzymatic method. | the hydrolysis of protopanaxadiol-type saponin mixture by various glycoside hydrolases was examined. among these enzymes, crude preparations of lactase from aspergillus oryzae, beta-galactosidase from a. oryzae, and cellulase from trichoderma viride were found to produce ginsenoside f(2) [3-o-(beta-d-glucopyranosyl)-20-o-beta-d-glucopyranosyl-20(s)-protopanaxadiol], compound k [20-o-beta-d-glucopyranosyl-20(s)-protopanaxadiol], and ginsenoside rd {3-o-[beta-d-glucopyranosyl-(1-->2)-beta-d-glucop ... | 2007 | 17917300 |
| characterization of aspergillus oryzae aspartyl aminopeptidase expressed in escherichia coli. | to characterize aspartyl aminopeptidase from aspergillus oryzae, the recombinant enzyme was expressed in escherichia coli. the enzyme cleaves n-terminal acidic amino acids. about 30% activity was retained in 20% nacl. digestion of defatted soybean by the enzyme resulted in an increase in the glutamic acid content, suggesting that the enzyme is potentially responsible for the release of glutamic acid in soy sauce mash. | 2007 | 17928682 |
| structure and characteristics of an endo-beta-1,4-glucanase, isolated from trametes hirsuta, with high degradation to crystalline cellulose. | trametes hirsuta produced cellulose-degrading enzymes when it was grown in a cellulosic medium such as avicel or wheat bran. an endo-beta-1,4-glucanase (theg) was purified from the culture filtrate, and the gene and the cdna were isolated. the gene consisted of an open reading frame encoding 384 amino acids, interrupted by 11 introns. the whole sequence showed high homology with that of family 5 glycoside hydrolase. the properties of the recombinant enzyme (reg) in aspergillus oryzae were compar ... | 2007 | 17928699 |
| purification and biochemical characterization of a thermostable extracellular glucoamylase produced by the thermotolerant fungus paecilomyces variotii. | an extracellular glucoamylase produced by paecilomyces variotii was purified using deae-cellulose ion exchange chromatography and sephadex g-100 gel filtration. the purified protein migrated as a single band in 7% page and 8% sds-page. the estimated molecular mass was 86.5 kda (sds-page). optima of temperature and ph were 55 degrees c and 5.0, respectively. in the absence of substrate the purified glucoamylase was stable for 1 h at 50 and 55 degrees c, with a t (50) of 45 min at 60 degrees c. th ... | 2008 | 17938981 |
| genes differentially expressed by aspergillus flavus strains after loss of aflatoxin production by serial transfers. | aflatoxins are carcinogenic fungal secondary metabolites produced by aspergillus flavus and other closely related species. levels of aflatoxins in agricultural commodities are stringently regulated by many countries because of the health hazard, and thus, aflatoxins are of major concern to both producers and consumers. a cluster of genes responsible for aflatoxin biosynthesis has been identified; however, expression of these genes is a complex and poorly understood phenomenon. to better understa ... | 2007 | 17955191 |
| inhibitory effects of fermented brown rice on induction of acute colitis by dextran sulfate sodium in rats. | although the pathogenic mechanisms of inflammatory bowel diseases are not fully understood, colonic microbiota may affect the induction of colonic inflammation, and some probiotics and prebiotics have been reported to suppress colitis. the inhibitory effects of brown rice fermented by aspergillus oryzae (fbra), a fiber-rich food, on the induction of acute colitis by dextran sulfate sodium (dss) were examined. feeding a 5% and 10% fbra-containing diet significantly decreased the ulcer and erosion ... | 2008 | 17957470 |
| absence of mutagenicity, genotoxicity, and subchronic oral toxicity of touchi extract. | touchi, a traditional chinese food used mainly for seasoning is obtained by first steaming soybeans followed by fermentation with aspergillus oryzae (koji). a series of toxicological studies was conducted to evaluate the mutagenic and genotoxic potential and subchronic toxicity of a water extract of touchi, a known inhibitor of alpha -glucosidase activity. touchi extract (te) did not induce reverse mutations in salmonella typhimurium strains ta98, ta1537, ta100, ta1535, and escherichia coli wp2u ... | 2007 | 17963133 |
| development of high-throughput screening system by single-cell reaction using microchamber array chip. | to demonstrate the practical use of a novel high-throughput screening system by a single cell reaction for the rapid screening of combinatorially mutated beta-glucosidase 1 from aspergillus oryzae, a yeast cell chip microchamber array in combination with yeast cell surface engineering was successfully developed. | 2007 | 17964493 |
| reversible and irreversible unfolding of multi-domain proteins. | in contrast to single-domain proteins unfolding of larger multi-domain proteins is often irreversible. in a comparative case study on three different multi-domain proteins (phosphoglycerate kinase: pgk and two homologous alpha-amylases: taka and bla) we investigated properties of unfolded states and their ability to fold back into the native state. for this purpose guanidine hydrochloride, alkaline ph, and thermal unfolded states were characterized. structural alterations upon unfolding and refo ... | 2007 | 17964867 |
| transcriptional regulation of genes on the non-syntenic blocks of aspergillus oryzae and its functional relationship to solid-state cultivation. | transcriptome analysis revealed close relationship between solid-state cultivation and the transcriptional regulation of the genes on the non-syntenic blocks (nsbs), which were characterized by the comparison of aspergillus oryzae genome with those of aspergillus fumigatus and aspergillus nidulans. average expression ratio of the genes on nsbs in solid-state cultivation was significantly higher than that on the syntenic blocks (sbs). of the induced genes, the genes relating to metabolism, which ... | 2008 | 17967552 |
| identification and characterization of an intracellular lectin, calnexin, from aspergillus oryzae using n-glycan-conjugated beads. | recently, asparagine-linked oligosaccharides (n-glycans) have been found to play a pivotal role in glycoprotein quality control in the endoplasmic reticulum (er). in order to screen proteins interacting with n-glycans, we developed affinity chromatography by conjugating synthetic n-glycans on sepharose beads. using the affinity beads with the dodecasaccharide glc(1)man(9)glcnac(2), one structure of the n-glycans, a 75-kda protein, was isolated from the membranous fraction including the er in asp ... | 2007 | 17986781 |
| physicochemical characterization of fructooligosaccharides and evaluation of their suitability as a potential sweetener for diabetics. | fructooligosaccharides (foss) were prepared from sucrose using fungal fructosyl transferase (ftase) obtained from aspergillus oryzae mtcc 5154. the resulting mixture consisted of glucose (28-30%), sucrose (18-20%) and fructooligosaccharides (50-54%) as indicated by hplc analysis. identification of oligomers present in the mixture of fructooligosaccharides was carried out using nmr spectroscopy and lc-ms. no compounds other than mono-, di-, tri-, tetra- and pentasaccharides were identified in the ... | 2008 | 18005951 |