Publications

TitleAbstractYear(sorted descending)
Filter
PMID
Filter
the effect of resource quantity and resource stoichiometry on microbial carbon-use-efficiency.the carbon-use-efficiency (cue) of microorganisms is an important parameter in determining ecosystem-level carbon (c) cycling; however, little is known about how variance in resources affects microbial cue. to elucidate how resource quantity and resource stoichiometry affect microbial cue, we cultured four microorganisms - two fungi (aspergillus nidulans and trichoderma harzianum) and two bacteria (pectobacterium carotovorum and verrucomicrobium spinosum) - under 12 unique c, nitrogen (n) and ph ...201020550579
recombinant production of an aspergillus nidulans class i hydrophobin (dewa) in hypocrea jecorina (trichoderma reesei) is promoter-dependent.fungal hydrophobins have potential for several applications because of their abilities to change the hydrophobicity of different surfaces. yet because of their tendency for aggregation and attachment to interfacial areas only few production processes have so far been reported. towards the development of a heterologous production system, we report here the expression of a class i hydrophobin dewa of aspergillus nidulans in hypocrea jecorina (trichoderma reesei). using the h. jecorina hfb2 (class ...201020567818
spotlight on aspergillus nidulans photosensory systems.aspergilli are ubiquitous soil-borne fungi growing within or on the surface of numerous organic substrates. growth within a substrate or growth on the surface correlates to different growth conditions for the hyphae due to significant changes in oxygen or reactive oxygen species levels and variations in humidity or temperature. the production of air-borne spores is supported by the substrate-air interphase and also requires a sensing system to adapt appropriately. here we focus on light as impor ...201020573560
thermotolerance of germlings and mycelium of the insect-pathogenic fungus metarhizium spp. and mycelial recovery after heat stress.the upper temperature limits for germination and growth were determined for metarhizium acridum (arsef 324, 3341 and 3609), m. robertsii (arsef 2575), m. anisopliae (arsef 5749), and aspergillus nidulans (atcc 10074). most of the metarhizium species germinated well at 35 and 36 degrees c; however, compared to 28 degrees c, the growth was very slow (except arsef 5749 from mexico, which germinated at 35 degrees c, but did not grow at 34 or 36 degrees c). germination was severely impaired at 38 and ...201020586069
wild-type mic distributions and epidemiological cutoff values for the triazoles and six aspergillus spp. for the clsi broth microdilution method (m38-a2 document).clinical breakpoints have not been established for mold testing. wild-type (wt) mic distributions (organisms in a species/drug combination with no detectable acquired resistance mechanisms) were defined in order to establish epidemiologic cutoff values (ecvs) for five aspergillus spp. and itraconazole, posaconazole, and voriconazole. also, we have expanded prior ecv data for aspergillus fumigatus. the number of available isolates varied according to the species/triazole combination as follows: 1 ...201020592159
role of nek6 in tumor promoter-induced transformation in jb6 c141 mouse skin epidermal cells.nek6 (nima-related kinase 6) is a homologue of the aspergillus nidulans protein nima (never in mitosis, gene a). we demonstrate that overexpression of nek6 induces anchorage-independent transformation of jb6 cl41 mouse epidermal cells. tissue arrays and western immunoblot analysis show that nek6 is overexpressed in malignant tissues and several cancer cell lines. our data also show that nek6 interacts with stat3, an oncogenic transcription factor, and phosphorylates stat3 on ser(727), which is i ...201020595392
fitness-associated sexual reproduction in a filamentous fungus.sex is a long-standing evolutionary enigma. although the majority of eukaryotes reproduce sexually at least sometimes [1-3], the evolution of sex from an asexual ancestor has been difficult to explain because it requires sexually reproducing lineages to overcome the manifold costs of sex, including the destruction of favorable gene combinations created by selection [4, 5]. conditions for the evolution of sex are much broader if individuals can reproduce either sexually or asexually (i.e., facult ...201020598542
aspergillus nidulans striatin (stra) mediates sexual development and localizes to the endoplasmic reticulum.striatin family proteins have been identified in animals and fungi and are considered to be scaffolding proteins. in fungi striatin orthologs have been associated with sexual development and virulence to plants. in this study, we characterized the functions and localization of the striatin ortholog, stra, in aspergillus nidulans. deltastra strains showed multiple defects in conidium germination, mycelial radial growth, production of diffusible red pigment, and reduced conidiation. the most strik ...201020601045
the extracellular β-1,3-endoglucanase enga is involved in autolysis of aspergillus nidulans.to elucidate the roles of the β-1,3-endoglucanase enga in autolysis of the filamentous fungus aspergillus nidulans and to identify the common regulatory elements of autolytic hydrolases.201020602653
flbc is a putative nuclear c2h2 transcription factor regulating development in aspergillus nidulans.asexual development (conidiation) in aspergillus is governed by multiple regulators. here, we characterize the upstream developmental activator flbc in aspergillus nidulans. flbc mrna is detectable throughout the life cycle, at relatively high levels during vegetative growth, early asexual and late sexual developmental phases. the deletion of flbc causes a delay/reduction in conidiation, brla and vosa expression, and conidial germination. while overexpression of flbc (oeflbc) does not elaborate ...201020624219
urea, the major urea/h+ symporter in aspergillus nidulans.we report here the characterization of urea, a high-affinity urea/h+ symporter of aspergillus nidulans. the deletion of the encoding gene abolishes urea transport at low substrate concentrations, suggesting that in these conditions urea is the sole transport system specific for urea in a. nidulans. the urea gene is not inducible by urea or its precursors, but responds to nitrogen metabolite repression, necessitating for its expression the area gata factor. in contrast to what was observed for ot ...201020633690
a cryptic role of a glycolytic-gluconeogenic enzyme (aldolase) in amino acid transporter turnover in aspergillus nidulans.in aspergillus nidulans the fbaa1013 mutation results in reduced or total loss of growth on glycolytic and gluconeogenic carbon sources, respectively. it also negatively affects growth on several amino acids (including l-proline, l-glutamate or l-aspartate) that the fungus can use as nitrogen source on glycolytic carbon sources. complementation of the fbaa1013 mutation using an a. nidulans genomic library resulted in cloning of the fbaa gene, which encodes a putative fructose 1,6-biphosphate ald ...201020026236
localization and function of calmodulin in live-cells of aspergillus nidulans.calmodulin (cam) is a small, eukaryotic protein that reversibly binds ca(2+). study of cam localization in genetically tractable organisms has yielded many insights into cam function. here, we described the dynamic localization of aspergillus nidulans cam (ancam) in live-cells by using recombination strains with homologous, single cross-over insertions at the target gene which placed the gfp fused copy under the inducible alca promoter and the rfp-cam integration under the native cam promoter. w ...201020034586
ffvel1 and fflae1, components of a velvet-like complex in fusarium fujikuroi, affect differentiation, secondary metabolism and virulence.besides industrially produced gibberellins (gas), fusarium fujikuroi is able to produce additional secondary metabolites such as the pigments bikaverin and neurosporaxanthin and the mycotoxins fumonisins and fusarin c. the global regulation of these biosynthetic pathways is only poorly understood. recently, the velvet complex containing vea and several other regulatory proteins was shown to be involved in global regulation of secondary metabolism and differentiation in aspergillus nidulans. here ...201020572938
the roles played by aspergillus nidulans apoptosis-inducing factor (aif)-like mitochondrial oxidoreductase (aifa) and nadh-ubiquinone oxidoreductases (ndea-b and ndia) in farnesol resistance.farnesol (foh) is a nonsterol isoprenoid produced by dephosphorylation of farnesyl pyrophosphate, a catabolite of the cholesterol biosynthetic pathway. these isoprenoids inhibit proliferation and induce apoptosis. here, we show that aspergillus nidulans aifa encoding the apoptosis-inducing factor (aif)-like mitochondrial oxidoreductase plays a role in the function of the mitochondrial complex i. additionally, we demonstrated that ndea-b and ndia encode external and internal alternative nadh dehy ...201020654725
aspernidine a and b, prenylated isoindolinone alkaloids from the model fungus aspergillus nidulans. 201020661238
cloning of a heat-stable chitin deacetylase gene from aspergillus nidulans and its functional expression in escherichia coli.a gene encoding chitin deacetylase was cloned by polymerase chain reaction from aspergillus nidulans. sequencing result showed 40% homology to the corresponding gene from colletotrichum lindemuthianum. the complete gene contains an open reading frame of 747 nucleotides encoding a sequence of 249 amino acid residues. the chitin deacetylase gene was subcloned into a pet28a expression vector and expressed in escherichia coli bl21 and then purified by metal affinity chromatography using a his-bind c ...201019760058
the aspergillus genome database, a curated comparative genomics resource for gene, protein and sequence information for the aspergillus research community.the aspergillus genome database (aspgd) is an online genomics resource for researchers studying the genetics and molecular biology of the aspergilli. aspgd combines high-quality manual curation of the experimental scientific literature examining the genetics and molecular biology of aspergilli, cutting-edge comparative genomics approaches to iteratively refine and improve structural gene annotations across multiple aspergillus species, and web-based research tools for accessing and exploring the ...201019773420
genetic analysis of conidiation regulatory pathways in koji-mold aspergillus oryzae.conidia of koji-mold aspergillus oryzae are often used as starters in the fermented food industry. however, little is known about conidiation regulation in a. oryzae. to improve the productivity of conidia in a. oryzae, it is necessary to understand conidiation regulation in the strain. therefore, we analyzed the conidiation regulatory system in a. oryzae using 10 kinds of conidiation regulatory gene disruptants. the phenotypes of aorflug, aorflba, aorflbb, aorflbc, aorflbd, aorflbe, aorbrla, ao ...201019850144
a fungal ph-responsive signaling pathway regulating aspergillus adaptation and invasion into the cornea.to investigate the role of palb and pacc, two components of a ph-responsive signal-transduction pathway of aspergillus nidulans, during the pathogenesis of fungal infection of the cornea.201019850840
peroxisomal localization and function of nadp+ -specific isocitrate dehydrogenases in yeast.yeast peroxisomal nadp(+)-specific isocitrate dehydrogenase (idp3) contains a canonical type i peroxisomal targeting sequence (a carboxyl-terminal cys-lys-leu tripeptide), and provides the nadph required for beta-oxidation of some fatty acids in that organelle. cytosolic yeast idp2 carrying a pts1 (idp2(+ckl)) was only partially localized to peroxisomes, and the enzyme was able to function in lieu of either peroxisomal idp3 or cytosolic idp2. the analogous isocitrate dehydrogenase enzyme (idpa) ...201019854152
ppoc from aspergillus nidulans is a fusion protein with only one active haem.in aspergillus nidulans ppos [psi (precocious sexual inducer)-producing oxygenases] are required for the production of so-called psi factors, compounds that control the balance between the sexual and asexual life cycle of the fungus. the genome of a. nidulans harbours three different ppo genes: ppoa, ppob and ppoc. for all three enzymes two different haem-containing domains are predicted: a fatty acid haem peroxidase/dioxygenase domain in the n-terminal region and a p450 haem-thiolate domain in ...201019878096
genome mining of mycosporine-like amino acid (maa) synthesizing and non-synthesizing cyanobacteria: a bioinformatics study.mycosporine-like amino acids (maas) are a family of more than 20 compounds having absorption maxima between 310 and 362 nm. these compounds are well known for their uv-absorbing/screening role in various organisms and seem to have evolutionary significance. in the present investigation we tested four cyanobacteria, e.g., anabaena variabilis pcc 7937, anabaena sp. pcc 7120, synechocystis sp. pcc 6803 and synechococcus sp. pcc 6301, for their ability to synthesize maa and conducted genomic and phy ...201019879348
heterologous expression of an agaricus meleagris pyranose dehydrogenase-encoding gene in aspergillus spp. and characterization of the recombinant enzyme.pyranose dehydrogenase (pdh) is a flavin-dependant sugar oxidoreductase found in the family agaricaceae, basidiomycetes that degrade lignocellulose-rich forest litter, and is catalytically related to the fungal enzymes pyranose 2-oxidase and cellobiose dehydrogenase. it has broad substrate specificity and displays similar activities with most sugar constituents of lignocellulose including disaccharides and oligosaccharides, a number of (substituted) quinones, and metal ions are suitable electron ...201019888575
aspergillus fumigatus meda governs adherence, host cell interactions and virulence.in medically important fungi, regulatory elements that control development and asexual reproduction often govern the expression of virulence traits. we therefore cloned the aspergillus fumigatus developmental modifier meda and characterized its role in conidiation, host cell interactions and virulence. as in the model organism aspergillus nidulans, disruption of meda in a. fumigatus dramatically reduced conidiation. however, the conidiophore morphology was markedly different between the two spec ...201019889083
the antifungal protein paf interferes with pkc/mpk and camp/pka signalling of aspergillus nidulans.the penicillium chrysogenum antifungal protein paf inhibits polar growth and induces apoptosis in aspergillus nidulans. we report here that two signalling cascades are implicated in its antifungal activity. paf activates the camp/protein kinase a (pka) signalling cascade. a pkaa deletion mutant exhibited reduced sensitivity towards paf. this was substantiated by the use of pharmacological modulators: paf aggravated the effect of the activator 8-br-camp and partially relieved the repressive activ ...201019889092
cucu modification of mrna promotes decapping and transcript degradation in aspergillus nidulans.in eukaryotes, mrna decay is generally initiated by the shortening of the poly(a) tail mediated by the major deadenylase complex ccr4-caf1-not. the deadenylated transcript is then rapidly degraded, primarily via the decapping-dependent pathway. here we report that in aspergillus nidulans both the caf1 and ccr4 orthologues are functionally distinct deadenylases in vivo: caf1 is required for the regulated degradation of specific transcripts, and ccr4 is responsible for basal degradation. intriguin ...201019901075
unilateral ureteral obstruction caused by aspergillus, subgenus nidulantes in a patient on steroid therapy: a case report and review of the literature.urinary tract obstructions caused by aspergillus bezoars has been reported on rare occasions. we describe in this paper an unusual case caused by an isolate of the aspergillus nidulantes subgenus, and review the literature on 13 additional cases of ureteral obstruction due to renoureteric aspergillosis so as to provide the characteristics of this disease entity. our case presented with a unilateral ureteral obstruction and acute renal failure due to aspergillus bezoars. the patient was immunocom ...201019905965
proteomic analysis of early phase of conidia germination in aspergillus nidulans.in order to investigate proteins involved in early phase of conidia germination, proteomic analysis was performed using two-dimensional gel electrophoresis (2d-ge) in conjunction with maldi-tof mass spectrometry (ms). the expression levels of 241 proteins varied quantitatively with statistical significance (p<0.05) at the early phase of the germination stage. out of these 57 were identified by maldi-tof ms. through classification of physiological functions from conserved domain database analysis ...201019919853
a novel motif in fungal class 1 histone deacetylases is essential for growth and development of aspergillus.acetylation of the n-terminal tails of core histones is an important regulatory mechanism in eukaryotic organisms. in filamentous fungi, little is known about the enzymes that modify histone tails. however, it is increasingly evident that histone deacetylases and histone acetyltransferases are critical factors for the regulation of genes involved in fungal pathogenicity, stress response, and production of secondary metabolites such as antibiotics or fungal toxins. here, we show that depletion of ...201019940017
septins aspa and aspc are important for normal development and limit the emergence of new growth foci in the multicellular fungus aspergillus nidulans.septins are cytoskeletal proteins found in fungi, animals, and microsporidia, where they form multiseptin complexes that act as scaffolds recruiting and organizing other proteins to ensure normal cell division and development. here we characterize the septins aspa and aspc in the multicellular, filamentous fungus aspergillus nidulans. mutants with deletions of aspa, aspc, or both aspa and aspc show early and increased germ tube and branch emergence, abnormal septation, and disorganized conidioph ...201019949047
erl1, a novel era-like gtpase from magnaporthe oryzae, is required for full root virulence and is conserved in the mutualistic symbiont glomus intraradices.comparative analyses of genome sequences from several plant-infecting fungi have shown conservation and expansion of protein families with plant disease-related functions. here, we show that this hypothesis can be extended to mutualistic symbiotic fungi. we have identified a gene encoding an era (escherichia coli ras)-like gtpase in the rice blast fungus magnaporthe oryzae and found that it is orthologous to the mature amino terminal part of the gin1 protein from the arbuscular mycorrhizal (am) ...201019958140
the ccaat-binding complex coordinates the oxidative stress response in eukaryotes.the heterotrimeric ccaat-binding complex is evolutionary conserved in eukaryotic organisms. the corresponding aspergillus nidulans ccaat-binding factor (ancf) consists of the subunits hapb, hapc and hape. all of the three subunits are necessary for dna binding. here, we demonstrate that ancf senses the redox status of the cell via oxidative modification of thiol groups within the histone fold motif of hapc. mutational and in vitro interaction analyses revealed that two of these cysteine residues ...201019965775
transport-dependent endocytosis and turnover of a uric acid-xanthine permease.in this work we unmask a novel downregulation mechanism of the uric acid/xanthine transporter uapa, the prototype member of the ubiquitous nucleobase-ascorbate transporter family, directly related to its function. in the presence of substrates, uapa is endocytosed, sorted into the multivesicular body pathway and degraded in vacuoles. substrate-induced endocytosis, unlike ammonium-induced turnover, is absolutely dependent on uapa activity and several lines of evidence showed that the signal for i ...201020002879
formate-nitrite transporters: optimisation of expression, purification and analysis of prokaryotic and eukaryotic representatives.the formate-nitrite transporter family is composed of integral membrane proteins that possess six to eight alpha-helical transmembrane domains. genes encoding these proteins are observed widely in prokaryotic genomes as well as certain groups of lower eukaryotes. thus far, no structural information is available for this transporter family. towards this aim, and to provide protein for biophysical studies, overexpression of a prokaryotic (tpnirc, from the hyperthermophilic archaebacterium thermofi ...201020006708
caspofungin etest endpoint for aspergillus isolates shows poor agreement with the reference minimum effective concentration.the clinical and laboratory standards institute (clsi) m38-a2 reference broth microdilution (bmd) method for the antifungal susceptibility testing of filamentous fungi now includes guidelines for testing echinocandin activity using the minimum effective concentration (mec) as the endpoint measurement. in this study, we compared the caspofungin etest mic on rpmi agar and mueller-hinton agar (supplemented with glucose and methylene blue [mgm]) to the bmd mec for 345 clinical aspergillus isolates, ...201020007389
the crystal structure of an lll-configured depsipeptide substrate analogue bound to isopenicillin n synthase.isopenicillin n synthase (ipns) is a non-heme iron(ii) oxidase, which catalyses the biosynthesis of isopenicillin n (ipn) from the tripeptide delta-l-alpha-aminoadipoyl-l-cysteinyl-d-valine (lld-acv) in a remarkable oxidative bicyclisation reaction. the natural substrate for ipns is the lld-configured tripeptide. lll-acv is not turned over by the enzyme, but inhibits turnover of the lld-tripeptide. the mechanism by which this inhibition takes place is not fully understood. recent studies have em ...201020024142
aoxa is a major peroxisomal long chain fatty acyl-coa oxidase required for beta-oxidation in a. nidulans.filamentous fungi can use a variety of fatty acids (fa) as sole carbon and energy sources. aspergillus nidulans has been shown to possess both peroxisomal and mitochondrial beta-oxidation pathways. in these studies, the major peroxisomal long chain fatty acyl coenzyme a oxidase aoxa was identified. aoxa was shown to be localised to peroxisomes and deletion of the aoxa gene leads to reduced growth on long chain fa, but not on short chain fa. aoxa is predicted to be part of the same peroxisomal be ...201020043225
parp is involved in replicative aging in neurospora crassa.modification of proteins by the addition of poly(adp-ribose) is carried out by poly(adp-ribose) polymerases (parps). parps have been implicated in a wide range of biological processes in eukaryotes, but no universal function has been established. a study of the aspergillus nidulans parp ortholog (prpa) revealed that the protein is essential and involved in dna repair, reminiscent of findings using mammalian systems. we found that a neurospora parp orthologue (npo) is dispensable for cell surviva ...201020045739
reduced expression of the o-mannosyltransferase 2 (afpmt2) leads to deficient cell wall and abnormal polarity in aspergillus fumigatus.protein o-mannosyltransferases (pmts) initiate o-mannosylation of secretory proteins, which are of fundamental importance in eukaryotes. the human fungal pathogen aspergillus fumigatus possesses three genes encoding for pmts, namely, afpmt1, afpmt2 and afpmt4. we have previously shown that lack of afpmt1 leads to a temperature-sensitive phenotype featured with severe defects in hyphal growth, conidiation, cell wall integrity and morphology at elevated temperatures. in this study, a conditional m ...201020053626
regulation of ustilago maydis dimorphism, sporulation, and pathogenic development by a transcription factor with a highly conserved apses domain.in ustilago maydis, the causal agent of corn smut, the morphological transition from yeast to filamentous growth is inextricably linked to pathogenicity; budding haploid cells are saprobic and, upon mating of compatible strains, the fungus converts to dikaryotic filamentous growth and obligate parasitism. the filamentous dikaryon proliferates in the host plant, inducing tumor formation and undergoing additional morphological changes that eventually result in the production of melanized diploid t ...201020064064
reaction coordinate of isopenicillin n synthase: oxidase versus oxygenase activity.isopenicillin n synthase (ipns) can have both oxidase and oxygenase activity depending on the substrate. for the native substrate, acv, oxidase activity exists; however, for the substrate analogue acov, which lacks an amide nitrogen, ipns exhibits oxygenase activity. the potential energy surfaces for the o-o bond elongation and cleavage were calculated for three different reactions: homolytic cleavage via traditional fenton chemistry, heterolytic cleavage, and nucleophilic attack. these surfaces ...201020078029
identification of possible targets of the aspergillus fumigatus crz1 homologue, crza.calcineurin, a serine/threonine-specific protein phosphatase, plays an important role in the control of cell morphology and virulence in fungi. calcineurin regulates localization and activity of a transcription factor called crz1. recently, we characterize aspergillus fumigatus crz1 homologue, afcrza. here, we investigate which pathways are influenced by a. fumigatus afcrza during a short pulse of calcium by comparatively determining the transcriptional profile of a. fumigatus wild type and delt ...201020078882
mechanism of de novo branched-chain amino acid synthesis as an alternative electron sink in hypoxic aspergillus nidulans cells.although branched-chain amino acids are synthesized as building blocks of proteins, we found that the fungus aspergillus nidulans excretes them into the culture medium under hypoxia. the transcription of predicted genes for synthesizing branched-chain amino acids was upregulated by hypoxia. a knockout strain of the gene encoding the large subunit of acetohydroxy acid synthase (ahas), which catalyzes the initial reaction of the synthesis, required branched-chain amino acids for growth and excrete ...201020081005
design, synthesis and biological evaluation of carboxy analogues of arginine methyltransferase inhibitor 1 (ami-1).here we report the synthesis of a number of compounds structurally related to arginine methyltransferase inhibitor 1 (ami-1). the structural alterations that we made included: 1) the substitution of the sulfonic groups with the bioisosteric carboxylic groups; 2) the replacement of the ureidic function with a bis-amidic moiety; 3) the introduction of a n-containing basic moiety; and 4) the positional isomerization of the aminohydroxynaphthoic moiety. we have assessed the biological activity of th ...201020091730
the transposon impala is activated by low temperatures: use of a controlled transposition system to identify genes critical for viability of aspergillus fumigatus.genes that are essential for viability represent potential targets for the development of anti-infective agents. however, relatively few have been determined in the filamentous fungal pathogen aspergillus fumigatus. a novel solution employing parasexual genetics coupled with transposon mutagenesis using the fusarium oxysporum transposon impala had previously enabled the identification of 20 essential genes from a. fumigatus; however, further use of this system required a better understanding of ...201020097738
lipoperoxidation affects ochratoxin a biosynthesis in aspergillus ochraceus and its interaction with wheat seeds.in aspergillus nidulans, aspergillus flavus, and aspergillus parasiticus, lipoperoxidative signalling is crucial for the regulation of mycotoxin biosynthesis, conidiogenesis, and sclerotia formation. resveratrol, which is a lipoxygenase (lox) and cyclooxygenase inhibitor, downmodulates the biosynthesis of ochratoxin a (ota) in aspergillus ochraceus. in the genome of a. ochraceus, a lox-like sequence (aoloxa; national center for biotechnology information (ncbi) accession number: dq087531) for a l ...201020101489
molecular cloning, characterization and expression analysis of two beta-n-acetylhexosaminidase homologs of coccidioides posadasii.two full-length cdnas were isolated from coccidioides posadasii that encode two deduced proteins (cphex1 and cphex2) with homology to the glycosyl hydrolase 20 family of beta-n-acetylhexosaminidases. cphex1 consists of 595 amino acids, has a predicted molecular mass of 68 kda and shares the highest identity with the n-acetylhexosaminidase (naga) of aspergillus nidulans, while cphex2 consists of 603 amino acids, has a predicted molecular mass of 68.5 kda and shares the highest identity with nag1 ...201020109094
photodynamic inactivation of conidia of the fungi metarhizium anisopliae and aspergillus nidulans with methylene blue and toluidine blue.antimicrobial photodynamic treatment (pdt) is a promising method that can be used to control localized mycoses or kill fungi in the environment. a major objective of the current study was to compare the conidial photosensitization of two fungal species (metarhizium anisopliae and aspergillus nidulans) with methylene blue (mb) and toluidine blue (tbo) under different incubation and light conditions. parameters examined were media, photosensitizer (ps) concentration and light source. pdt with mb a ...201020113427
bioinspired deposition of tio2 thin films induced by hydrophobins.the deposition of ceramic thin films from aqueous solutions at low temperature using biopolymers as templates has attracted much attention due to economic and environmental benefits. titanium dioxide is one of the most attractive functional materials and shows a wide range of applications across vastly different areas because of its unique chemical, optical, and electrical properties. in the present work, we deposited smooth, nanocrystalline titania thin films by an aqueous deposition method on ...201020121159
atfa bzip-type transcription factor regulates oxidative and osmotic stress responses in aspergillus nidulans.the aim of the study was to demonstrate that the bzip-type transcription factor atfa regulates different types of stress responses in aspergillus nidulans similarly to atf1, the orthologous 'all-purpose' transcription factor of schizosaccharomyces pombe. heterologous expression of atfa in a s. pombe deltaatf1 mutant restored the osmotic stress tolerance of fission yeast in surface cultures to the same level as recorded in complementation studies with the atf1 gene, and a partial complementation ...201020131067
heterochromatic marks are associated with the repression of secondary metabolism clusters in aspergillus nidulans.fungal secondary metabolites are important bioactive compounds but the conditions leading to expression of most of the putative secondary metabolism (sm) genes predicted by fungal genomics are unknown. here we describe a novel mechanism involved in sm-gene regulation based on the finding that, in aspergillus nidulans, mutants lacking components involved in heterochromatin formation show de-repression of genes involved in biosynthesis of sterigmatocystin (st), penicillin and terrequinone a. durin ...201020132440
the concerted action of bzip and cmyb transcription factors flbb and flbd induces brla expression and asexual development in aspergillus nidulans.fungi are capable of generating diverse cell types through developmental processes that stem from hyphae, acting as pluripotent cells. the formation of mitospores on emergence of hyphae to the air involves the participation of transcription factors, which co-ordinate the genesis of new cell types, eventually leading to spore formation. in this investigation, we show that bzip transcription factor flbb, which has been attributed to participate in transducing the aerial stimulus signal, activates ...201020132447
characterization of the aspergillus nidulans monodictyphenone gene cluster.deletion of ccla, a component of the compass complex of aspergillus nidulans, results in the production of monodictyphenone and emodin derivatives. through a set of targeted deletions in a ccla deletion strain, we have identified the genes required for monodictyphenone and emodin analog biosynthesis. identification of an intermediate, endocrocin, from an mdphdelta strain suggests that mdph might encode a decarboxylase. furthermore, by replacing the promoter of mdpa (a putative aflj homolog) and ...201020139316
genotoxic activity of eucalyptus globulus essential oil in aspergillus nidulans diploid cells.eucalyptus globulus essential oil was evaluated for its genotoxic potential using a somatic segregation assay and a diploid strain of the fungus aspergillus nidulans, heterozygous for nutritional and conidia color markers. the main compounds of the current essential oil sample were eucalyptol (49.0 %), alpha-pinene (8.9), beta-pinene (1.5), globulol (6.9), alpha-eudesmol (1.12), spathulenol (1.42), gamma-cadinene (1.45), trans-beta-elemenone (1.23) and aromandendrene (2.3), totaling 74 % of oil. ...201020140715
asperfuranone from aspergillus nidulans inhibits proliferation of human non-small cell lung cancer a549 cells via blocking cell cycle progression and inducing apoptosis.asperfuranone, a novel compound of genomic mining in aspergillus nidulans, was investigated for its anti-proliferative activity in human non-small cell lung cancer a549 cells. to identity the anti-cancer mechanism of asperfuranone, we assayed its effect on apoptosis, cell cycle distribution, and levels of p53, p21 waf1/cip1, fas/apo-1 receptor and fas ligand. enzyme-linked immunosorbent assay showed that the g0/g1 phase arrest might be due to p53-dependent induction of p21 waf1/cip1. an enhancem ...201020148857
the conserved and divergent roles of carbonic anhydrases in the filamentous fungi aspergillus fumigatus and aspergillus nidulans.carbon dioxide (co(2)) and its hydration product bicarbonate (hco(3)(-)) are essential molecules in various physiological processes of all living organisms. the reversible interconversion between co(2) and hco(3)(-) is in equilibrium. this reaction is slow without catalyst, but can be rapidly facilitated by zn(2+)-metalloenzymes named carbonic anhydrases (cas). to gain an insight into the function of multiple clades of fungal ca, we chose to investigate the filamentous fungi aspergillus fumigatu ...201020149101
overexpression of bacterial ethylene-forming enzyme gene in trichoderma reesei enhanced the production of ethylene.in order to efficiently utilize natural cellulose materials to produce ethylene, three expression vectors containing the ethylene-forming enzyme (efe) gene from pseudomonas syringae pv. glycinea were constructed. the target gene was respectively controlled by different promoters: cbh i promoter from trichoderma reesei cellobiohydrolases i gene, gpd promoter from aspergillus nidulans glyceraldehyde-3-phosphate dehydrogenase gene and pgk i promoter from t. reesei 3-phosphoglycerate kinase i gene. ...201020150979
expression and purification of a functional uric acid-xanthine transporter (uapa).the nucleobase-ascorbate transporters (nats) family includes carriers with fundamental functions in uptake of key cellular metabolites, such as uric acid or vitamin c. the best studied example of a nat transporter is the uric acid-xanthine permease (uapa) from the model ascomycete aspergillus nidulans. detailed genetic and biochemical analyses have revealed much about the mechanism of action of this protein; however, the difficulties associated with handling eukaryotic membrane proteins have lim ...201020153431
evaluation of performance and community dynamics of microorganisms during treatment of distillery spent wash in a three stage bioreactor.the ability of emericella nidulans var. lata, neurospora intermedia and bacillus sp. to treat distillery spent wash in a three stage bioreactor was investigated. process parameters were optimized in shake flask cultures with the individual strains before treatment of the effluent in a 15-l bioreactor. treatment was first carried out by the fungi followed by bacteria. the treated effluent showed significant reduction in color (82%) and cod (93%) after 30 h. metabolites formed after degradation of ...201020156685
metabolic and developmental effects resulting from deletion of the cita gene encoding citrate synthase in aspergillus nidulans.citrate synthase is a central activity in carbon metabolism. it is required for the tricarboxylic acid (tca) cycle, respiration, and the glyoxylate cycle. in saccharomyces cerevisiae and arabidopsis thaliana, there are mitochondrial and peroxisomal isoforms encoded by separate genes, while in aspergillus nidulans, a single gene, cita, encodes a protein with predicted mitochondrial and peroxisomal targeting sequences (pts). deletion of cita results in poor growth on glucose but not on derepressin ...201020173036
molecular genetic analysis of the orsellinic acid/f9775 gene cluster of aspergillus nidulans.f-9775a and f-9775b are cathepsin k inhibitors that arise from a chromatin remodelling deletant strain of aspergillus nidulans. a polyketide synthase gene has been determined to be responsible for their formation and for the simpler, archetypical polyketide orsellinic acid. we have discovered simple culture conditions that result in the production of the three compounds, and this facilitates analysis of the genes responsible for their synthesis. we have now analysed the f9775/orsellinic acid gen ...201020174687
regulation of septum formation by the bud3-rho4 gtpase module in aspergillus nidulans.the ability of fungi to generate polarized cells with a variety of shapes likely reflects precise temporal and spatial control over the formation of polarity axes. the bud site selection system of saccharomyces cerevisiae represents the best-understood example of such a morphogenetic regulatory system. however, the extent to which this system is conserved in the highly polarized filamentous fungi remains unknown. here, we describe the functional characterization and localization of the aspergill ...201020176976
dynamic elements at both cytoplasmically and extracellularly facing sides of the uapa transporter selectively control the accessibility of substrates to their translocation pathway.in the uapa uric acid-xanthine permease of aspergillus nidulans, subtle interactions between key residues of the putative substrate binding pocket, located in the tms8-tms9 loop (where tms is transmembrane segment), and a specificity filter, implicating residues in tms12 and the tms1-tms2 loop, are critical for function and specificity. by using a strain lacking all transporters involved in adenine uptake (deltaazga deltafcyb deltauapc) and carrying a mutation that partially inactivates the uapa ...201020188741
mitotic crossing-over induced by two commercial herbicides in diploid strains of the fungus aspergillus nidulans.some herbicides are suspected of promoting teratogenic, carcinogenic and mutagenic events. detection of induced mitotic crossing-over has proven to be an indirect way of testing the carcinogenic properties of suspicious substances, because mitotic crossing-over is involved in the multistep process of carcinogenesis. we examined mitotic crossing-over induced by two commercial herbicides (diuron and trifluralin) in diploid strains of aspergillus nidulans based on the homozygotization index. low do ...201020198578
proteome analysis of fungal and bacterial involvement in leaf litter decomposition.fungi and bacteria are key players in the decomposition of leaf litter, but their individual contributions to the process and their interactions are still poorly known. we combined semi-quantitative proteome analyses (1-d page-lc-ms/ms) with qualitative and quantitative analyses of extracellular degradative enzyme activities to unravel the respective roles of a fungus and a bacterium during litter decomposition. two model organisms, a mesophilic gram-negative bacterium (pectobacterium carotovoru ...201020198641
aspergillus nidulans udp-glucose-4-epimerase ugea has multiple roles in wall architecture, hyphal morphogenesis, and asexual development.aspergillus nidulans udp-glucose-4-epimerase ugea interconverts udp-glucose and udp-galactose and participates in galactose metabolism. the sugar moiety of udp-galactose is predominantly found as galactopyranose (galp, the six-membered ring form), which is the substrate for udp-galactopyranose mutase (encoded by ugma) to generate udp-galactofuranose (galf, the five-membered ring form) that is found in fungal walls. in a. fumigatus, galf residues appear to be important for virulence. the a. nidul ...201020211750
involvement of transposon-like elements in penicillin gene cluster regulation.subtelomeric secondary metabolite (sm) gene clusters are frequently surrounded by dna repeats and transposon-like elements. the aspergillus nidulans penicillin cluster, 30kb from the telomere of chromosome vi, is bordered by such elements. deletions of penicillin telomere proximal and distal border regions resulted in decreased penicillin production. a 3.7kb distal region called pbia, consisting of the putative transposable element dna-2, was examined further where its replacement by a pyrg mark ...201020219692
effect of light on growth, intracellular and extracellular pigment production by five pigment-producing filamentous fungi in synthetic medium.the competence of the living creatures to sense and respond to light is well known. the effect of darkness and different color light quality on biomass, extracellular and intracellular pigment yield of five potent pigment producers monascus purpureus, isaria farinosa, emericella nidulans, fusarium verticillioides and penicillium purpurogenum, with different color shades such as red, pink, reddish brown and yellow, were investigated. incubation in total darkness increased the biomass, extracellul ...201020226375
distinct roles for caf1, ccr4, edc3 and cuta in the co-ordination of transcript deadenylation, decapping and p-body formation in aspergillus nidulans.transcript degradation is a key step in gene regulation. in eukaryotes, mrna decay is generally initiated by removal of the poly(a) tail mediated by the ccr4-caf1-not complex. deadenylated transcripts are then rapidly degraded, primarily via the decapping-dependent pathway. components of this pathway can be localized into highly dynamic cytoplasmic foci, the mrna processing (p)-bodies. we have undertaken confocal fluorescence microscopy to monitor p-bodies in aspergillus nidulans. as in other or ...201020233300
deletion of the ring-finger peroxin 2 gene in aspergillus nidulans does not affect meiotic development.peroxins are required for protein import into peroxisomes as well as for peroxisome biogenesis and proliferation. loss-of-function mutations in genes for the ring-finger peroxins pex2, pex10 and pex12 lead to a specific block in meiosis in the ascomycete podospora anserina. however, loss of protein import into peroxisomes does not result in this meiotic defect. therefore, it has been suggested that these peroxins have a specific function required for meiosis. to determine whether this role is co ...201020236327
novel insights into the functional role of three protein arginine methyltransferases in aspergillus nidulans.protein arginine methylation has been implicated in different cellular processes including transcriptional regulation by the modification of histone proteins. here we demonstrate significant in vitro activities and multifaceted specificities of aspergillus protein arginine methyltransferases (prmts) and we provide evidence for a role of protein methylation in mechanisms of oxidative stress response. we have isolated all three aspergillus prmts from fungal extracts and could assign significant hi ...201020338257
interaction of the aspergillus nidulans microtubule-organizing center (mtoc) component apsb with gamma-tubulin and evidence for a role of a subclass of peroxisomes in the formation of septal mtocs.peroxisomes are a diverse class of organelles involved in different physiological processes in eukaryotic cells. although proteins imported into peroxisomes carry a peroxisomal targeting sequence at the c terminus (pts1) or an alternative one close to the n terminus (pts2), the protein content of peroxisomes varies drastically. here we suggest a new class of peroxisomes involved in microtubule (mt) formation. eukaryotic cells assemble mts from distinct points in the cell. in the fungus aspergill ...201020348383
aspergillus nidulans contains six possible fatty acyl-coa synthetases with faab being the major synthetase for fatty acid degradation.aspergillus nidulans can use a variety of fatty acids as sole carbon and energy sources via its peroxisomal and mitochondrial beta-oxidation pathways. prior to channelling the fatty acids into beta-oxidation, they need to be activated to their acyl-coa derivates. analysis of the genome sequence identified a number of possible fatty acyl-coa synthetases (fata, fatb, fatc, fatd, faaa and faab). faab was found to be the major long-chain synthetase for fatty acid degradation. faab was shown to local ...201020354844
a septin from the filamentous fungus a. nidulans induces atypical pseudohyphae in the budding yeast s. cerevisiae.septins, novel cytoskeletal proteins, form rings at the bases of emerging round buds in yeasts and at the bases of emerging elongated hyphal initials in filamentous fungi.201020360845
gdp-mannose transporter paralogues play distinct roles in polarized growth of aspergillus nidulans.gdp-mannose transporters (gmt) carry gdp-mannose nucleotide sugars from the cytosol across the golgi apparatus membrane for use as substrates in protein glycosylation in plants, animals and fungi. genomes of some fungal species, such as the yeast saccharomyces cerevisiae, contain only one gene encoding a gmt, while others, including aspergillus nidulans, contain two (gmta and gmtb). we previously showed that cell wall integrity and normal hyphal morphogenesis in a. nidulans depend upon the funct ...201020361498
characterization of aspergillus nidulans didb did2, a non-essential component of the multivesicular body pathway.escrt-iii heteropolymers mediate membrane protein cargo sorting into multivesicular endosomes for subsequent vacuolar degradation. we studied the localization of largely uncharacterized aspergillus nidulans escrt-iii using its key structural component vps32 and the 'associated' component didb(did2). vps32-gfp localizes to motile early endosomes as reported, but predominates in aggregates often associated with vacuoles due to inability to dissociate from endosomes. didb(did)(2) regulating vps4 (t ...201020362686
single-step affinity purification for fungal proteomics.a single-step protein affinity purification protocol using aspergillus nidulans is described. detailed protocols for cell breakage, affinity purification, and depending on the application, methods for protein release from affinity beads are provided. examples defining the utility of the approaches, which should be widely applicable, are included.201020363899
receptor-independent ambient ph signaling by ubiquitin attachment to fungal arrestin-like palf.the seven-transmembrane receptor palh and its coupled, positive-acting arrestin-like protein palf are key components of a molecular sensor that in aspergillus nidulans and other ascomycete fungi mediates activation of an intracellular signaling cascade by alkaline ambient ph. palf is ubiquitinated in an alkaline ph- and palh-dependent manner. we show here that palf assists the plasma membrane localization of palh and that palf overexpression slightly hypersensitizes the pathway to alkaline ph bu ...201020368671
the choc gene encoding a putative phospholipid methyltransferase is essential for growth and development in aspergillus nidulans.phosphatidylcholines (pcs) are a class of major cell membrane phospholipids that participate in many physiological processes. three genes, choa, chob and choc, have been proposed to function in the endogenous biosynthesis of pc in aspergillus nidulans. in this study, we characterize the choc gene encoding a putative highly conserved phospholipid methyltransferase. the previously reported choc3 mutant allele results from a mutation leading to the e177k amino acid substitution. the transcript of c ...201020379720
[guideline based treatment of invasive aspergillosis].invasive fungus infections caused by aspergillus spp. occur most frequently in immunocompromised patients. a high infection-associated death rate of up to and over 50% is attributed even today to these fungi. the disease in humans is caused mainly by aspergillus fumigatus, aspergillus flavus and aspergillus niger. other species, for example, aspergillus terreus or aspergillus nidulans are quantitatively less prevalent. evidence based treatment of invasive aspergillosis has become safer and more ...201020433655
recombinantly produced hydrophobins from fungal analogues as highly surface-active performance proteins.hydrophobins are available from natural resources only in milligram amounts. basf succeeded in a recombinant production process, up-scaled to pilot plant production in kilogram scale. strain and protein optimization by modulation of gene expression and generation of fusion proteins finally leads to two class i hydrophobins called h*protein a and h*protein b. by analytical ultracentrifugation, we confirm that the self-association of h*proteins in solution is governed by their sequence, because ol ...201019290518
characterisation of the cipc-like protein afua_5g09330 of the opportunistic human pathogenic mould aspergillus fumigatus.aspergillus fumigatus is currently the major airborne fungal pathogen that menaces immunocompromised individuals. germination of inhaled conidia is a hallmark of the early infection process, but little is known about the underlying mechanisms. the intention of our ongoing studies is the identification of a. fumigatus proteins that are differentially expressed during germination and may provide insights in the germination process. using a proteomic approach, we identified afua_5g09330 as a major ...201019486301
meab-dependent nutrition sensing regulates autolysis in carbon starved aspergillus nidulans cultures.carbon starvation induced autolysis is an active process of self-digestion and is under complex regulation in aspergillus nidulans. in this study we investigated how autolysis depends on the composition of the culture medium, especially on the presence of yeast extract. we demonstrated that the rate of autolytic cell wall degradation as well as the extracellular chitinase and proteinase productions significantly decreased in the presence of this nutrient. the effect of yeast extract on carbon st ...201023100816
cytological characterization of an aspergillus nidulans mutant from a strain with chromosomic duplication.a development mutant, named v103, was obtained spontaneously from the a strain of a. nidulans. the a strain contains a duplicated segment of chromosome i that has undergone translocation to chromosome ii (i ii). it is mitotically unstable and generates phenotypically deteriorated types, some with enhanced stability. the deteriorated variants of a. nidulans show abnormal development, exhibiting slower colony growth, variations in colony pigmentation and changes in conidiophore structure. the alte ...201024031489
regulation of development in aspergillus nidulans and aspergillus fumigatus.members of the genus aspergillus are the most common fungi and all reproduce asexually by forming long chains of conidiospores (or conidia). the impact of various aspergillus species on humans ranges from beneficial to harmful. for example, several species including aspergillus oryzae and aspergillus niger are used in industry for enzyme production and food processing. in contrast, aspergillus flavus produce the most potent naturally present carcinogen aflatoxins, which contaminate various plant ...201023956662
kin3 protein, a nima-related kinase of saccharomyces cerevisiae, is involved in dna adduct damage response.kin3 is a nonessential serine/threonine protein kinase of the budding yeast saccharomyces cerevisiae with unknown cellular role. it is an ortholog of the aspergillus nidulans protein kinase nima (never-in mitosis, gene a), which is involved in the regulation of g2/m phase progression, dna damage response and mitosis. the aim of this study was to determine whether kin3 is required for proper checkpoint activation and dna repair. here we show that kin3 gene deficient cells present sensitivity and ...201021577056
[screening and application of phosphate-dissolving microorganism suitable for corn production].to obtain phosphate-dissolving strains which can be suitable for corn production.201021365915
phg/psilbaγ vector system for efficient gene silencing in homobasidiomycetes: optimization of ihprna - triggering in the mycorrhizal fungus laccaria bicolor.psilbaγ silencing vector was constructed for efficient rna silencing triggering in the model mycorrhizal fungus laccaria bicolor. this cloning vector carries the agaricus bisporus gpdii promoter, two multiple cloning sites separated by a l. bicolor nitrate reductase intron and the aspergillus nidulans trpc terminator. psilbaγ allows an easy oriented two-step pcr cloning of hairpin sequences to be expressed in basidiomycetes. with one further cloning step into phg, a pcambia1300-based binary vect ...201021255319
[comparison of genomes between aspergillus nidulans and 30 filamentous ascomycetes].to investigate the conserved homologs of filamentous ascomycetes genomes, the local fungal genome database used in this analysis was established, which consisted of 31 latest and complete genome data publicly available on the internet. an expectation value cutoff of 0.1 was used to identify significant hits. each complete gene set of the query genome aspergillus nidulans genome with 10,560 annotated genes was splitted into individual fasta files with seqverter and then compared separately agains ...201021513172
gene knockdown by ihprna-triggering in the ectomycorrhizal basidiomycete fungus laccaria bicolor.ectomycorrhiza (ecm) is a mutualistic association between fungi and the roots of the vast majority of trees. these include numerous ecologically and economically relevant species and the participating fungal symbionts are predominantly filamentous basidiomycetes. in natural ecosystems the plant nutrient uptake from soil takes place via the extraradical mycelia of these ecm mycosimbionts as a trade for plant photosyntates. the symbiotic phase in the life cycle of ecm basidiomycetes is the dikaryo ...201021326837
adaptative and developmental responses to stress in aspergillus nidulan.development in the ascomycete a. nidulans is principally determined by environmental signals. adaptability to oxidative stimuli can derive in changes of growth patterns and /or the activation of sexual or asexual reproductive cycles but this model fungus might also respond to high osmotic or salt concentrations, the redox state, the availability and quantity of carbon or nitrogen sources and the degree or quality of illumination. since each cell within the colony follows a single morphogenetic p ...201021235506
simple identification of vea1 mutation in aspergillus nidulans.the vea gene plays an important role in development of a homothallic filamentous fungus aspergillus nidulans. the vea1 phenotype can be difficult to distinguish from the wild-type vea. despite the importance of the vea allele, no efficient identification method has been reported besides dna sequencing. here, we present simple physiological and molecular biological ways to distinguish between the vea wild-type and vea1 allele. the novel approaches, which involve incubation in the presence of oxal ...201021221952
crystallization and preliminary x-ray crystallographic analysis of the nmra-like ddb_g0286605 protein from the social amoeba dictyostelium discoideum.the ddb_g0286605 gene product from dictyostelium discoideum, an nmra-like protein that belongs to the short-chain dehydrogenase/reductase family, has been crystallized by the hanging-drop vapour-diffusion method at 295 k. a 1.64 å resolution data set was collected using synchrotron radiation. the ddb_g0286605 protein crystals belonged to space group p2(1), with unit-cell parameters a=67.598, b=54.935, c=84.219 å, β = 109.620°. assuming the presence of two molecules in the asymmetric unit, the so ...201021206034
enzymatic synthesis of β-xylosyl-oligosaccharides by transxylosylation using two β-xylosidases of glycoside hydrolase family 3 from aspergillus nidulans fgsc a4.two β-xylosidases of glycoside hydrolase family 3 (gh 3) from aspergillus nidulans fgsc a4, bxla and bxlb were produced recombinantly in pichia pastoris and secreted to the culture supernatants in yields of 16 and 118 mg/l, respectively. bxla showed about sixfold higher catalytic efficiency (k(cat)/k(m)) than bxlb towards para-nitrophenyl β-d-xylopyranoside (pnpx) and β-1,4-xylo-oligosaccharides (degree of polymerisation 2-6). for both enzymes k(cat)/k(m) decreased with increasing β-1,4-xylo-oli ...201021215963
telomere position effect is regulated by heterochromatin-associated proteins and nkua in aspergillus nidulans.gene-silencing mechanisms are being shown to be associated with an increasing number of fungal developmental processes. telomere position effect (tpe) is a eukaryotic phenomenon resulting in gene repression in areas immediately adjacent to telomere caps. here, tpe is shown to regulate expression of transgenes on the left arm of chromosome iii and the right arm of chromosome vi in aspergillus nidulans. phenotypes found to be associated with transgene repression included reduction in radial growth ...201020724388
the bzip transcription factor meab mediates nitrogen metabolite repression at specific loci.in fusarium fujikuroi, bikaverin (bik) biosynthesis is subject to repression by nitrogen. unlike most genes subject to nitrogen metabolite repression, it has been shown that transcription of bik biosynthetic genes is not area dependent. searching for additional transcription factors that may be involved in nitrogen regulation, we cloned and characterized the orthologue of aspergillus nidulans meab, which encodes a bzip transcription factor. two transcripts are derived from f. fujikuroi meab: the ...201020729292
repercussion of a deficiency in mitochondrial ß-oxidation on the carbon flux of short-chain fatty acids to the peroxisomal ß-oxidation cycle in aspergillus nidulans.the fungus aspergillus nidulans contains both a mitochondrial and peroxisomal ß-oxidation pathway. this work was aimed at studying the influence of mutations in the foxa gene, encoding a peroxisomal multifunctional protein, or in the scda/echa genes, encoding a mitochondrial short-chain dehydrogenase and an enoyl-coa hydratase, respectively, on the carbon flux to the peroxisomal ß-oxidation pathway. a. nidulans transformed with a peroxisomal polyhydroxyalkanoate (pha) synthase produced pha from ...201020736083
laea control of velvet family regulatory proteins for light-dependent development and fungal cell-type specificity.vea is the founding member of the velvet superfamily of fungal regulatory proteins. this protein is involved in light response and coordinates sexual reproduction and secondary metabolism in aspergillus nidulans. in the dark, vea bridges velb and laea to form the velb-vea-laea (velvet) complex. the vea-like protein velb is another developmental regulator, and laea has been known as global regulator of secondary metabolism. in this study, we show that velb forms a second light-regulated developme ...201021152013
a set of aspartyl protease-deficient strains for improved expression of heterologous proteins in kluyveromyces lactis.secretion of recombinant proteins is a common strategy for heterologous protein expression using the yeast kluyveromyces lactis. however, a common problem is degradation of a target recombinant protein by secretory pathway aspartyl proteases. in this study, we identified five putative pfam00026 aspartyl proteases encoded by the k. lactis genome. a set of selectable marker-free protease deletion mutants was constructed in the prototrophic k. lactis gg799 industrial expression strain background us ...201021166768
Displaying items 1001 - 1100 of 5149