Publications

generation and phenotypic characterization of aspergillus nidulans methylisocitrate lyase deletion mutants: methylisocitrate inhibits growth and conidiation.	propionate is a very abundant carbon source in soil, and many microorganisms are able to use this as the sole carbon source. nevertheless, propionate not only serves as a carbon source for filamentous fungi but also acts as a preservative when added to glucose containing media. to solve this contradiction between carbon source and preservative effect, propionate metabolism of aspergillus nidulans was studied and revealed the methylcitrate cycle as the responsible pathway. methylisocitrate lyase ...	2005	16151139
genetic analysis of the tor pathway in aspergillus nidulans.	we identified five genes encoding components of the tor signaling pathway within aspergillus nidulans. unlike the situation in saccharomyces cerevisiae, there is only a single tor kinase, as in plant and animal systems, and mutant phenotypes suggest that the tor pathway plays only a minor role in regulating nitrogen metabolism.	2005	16151253
circadian rhythms in neurospora crassa: clock gene homologues in fungi.	computer-based analysis of a total of 17 filamentous fungal and yeasts genomes has shown: (1) homologues of frq, wc-1, wc-2, and vvd, key gene components of the neurospora crassa clock, are present in magnaporthe grisea, gibberella zeae, and podospora anserina, suggesting an frq-based oscillator in these organisms; (2) some fungal species that are more distantly related to neurospora, such as rhizopus oryzae do not appear to have frq homologues; (3) many fungal species that do not appear to cont ...	2005	16154782
a two-step protocol for efficient deletion of genes in the filamentous ascomycete podospora anserina.	deletion of genes in podospora anserina via conventional methods is an inefficient and time-consuming process since homologous recombination occurs normally only at low frequency (about 1%). to improve the efficiency of replacement, we adopted the two-step protocol developed for aspergillus nidulans (chaveroche et al. in nucleic acids res 28:e97, 2000). as a prerequisite, a vector was generated containing a blasticidin resistance cassette for selection in the escherichia coli host strain ks272 ( ...	2005	16160832
characterization of the oat1 gene of penicillium chrysogenum encoding an omega-aminotransferase: induction by l-lysine, l-ornithine and l-arginine and repression by ammonium.	the penicillium chrysogenum oat1 gene, which encodes a class iii omega-aminotransferase, was cloned and characterized. this enzyme converts lysine into 2-aminoadipic semialdehyde, and plays an important role in the biosynthesis of 2-aminoadipic acid, a precursor of penicillin and other beta-lactam antibiotics. the enzyme is related to ornithine-5-aminotransferases and to the lysine-6-aminotransferases encoded by the lat genes found in bacterial cephamycin gene clusters. expression of oat1 is ind ...	2005	16163487
nuclear translocation of the heterotrimeric ccaat binding factor of aspergillus oryzae is dependent on two redundant localising signals in a single subunit.	the ccaat-binding complex in the aspergillus species, also known as the hap complex, consists of at least three subunits, namely hapb, hapc and hape. each hap subunit contains an evolutionary conserved core domain. recently, we have found that the hapc and hape subunits do not carry a nuclear localisation signal. furthermore, when in complex with hapb, they are transported into the nucleus via a 'piggy back mechanism' in a. nidulans. to extend our findings to other filamentous fungi, we examined ...	2005	16163515
the appearances of autolytic and apoptotic markers are concomitant but differently regulated in carbon-starving aspergillus nidulans cultures.	in ageing, carbon-depleted cultures of aspergillus nidulans strain fgsc 26 progressing apoptotic-type cell death was detected, characterised by increasing numbers of annexin v and tunel stained cells after protoplastation. dapi staining of autolysing mycelia revealed numerous nuclei with elongated, stick-like morphology, which was not observed in surviving hyphal fragments representing a cell population adapted to carbon starvation. apoptotic cell death was also progressing in aging cultures of ...	2005	16165325
synthesis of penicillium chrysogenum acetyl-coa:isopenicillin n acyltransferase in hansenula polymorpha: first step towards the introduction of a new metabolic pathway.	the enzyme acetyl-coa:isopenicillin n acyltransferase (iat) is a peroxisomal enzyme that mediates the final step of penicillin biosynthesis in the filamentous fungi penicillium chrysogenum and aspergillus nidulans. however, the precise role of peroxisomes in penicillin biosynthesis is still not clear. to be able to use the power of yeast genetics to solve the function of peroxisomes in penicillin biosynthesis, we introduced iat in the yeast hansenula polymorpha. to this purpose, the p. chrysogen ...	2005	16169289
nonribosomal peptide synthetase genes in the genome of fusarium graminearum, causative agent of wheat head blight.	fungal nonribosomal peptide synthetases (nrpss) are responsible for the biosynthesis of numerous metabolites which serve as virulence factors in several plant-pathogen interactions. the aim of our work was to investigate the diversity of these genes in a fusarium graminearum sequence database using bioinformatic techniques. our search identified 15 nrps sequences, among which two were found to be closely related to peptide synthetases of various fungi taking part in ferrichrome biosynthesis. ano ...	2005	16196211
increased mesquite gum formation in nodal explants cultures after treatment with a microbial biomass preparation.	prosopis laevigata nodal explants cultures were established in murashige and skoog medium. simultaneously these cultures were subjected to stress with biotic elicitors and an environmental factor (temperature increase to promote heat stress) in order to promote and increase exuded mesquite gum production. the biotic elicitors were: aspergillus nidulans and pseudomonas pseudoalcaligenes both used in concentrations of 10, 20 and 30 mg, whereas the environmental condition was different incubation t ...	2005	16198591
quality control and reference guidelines for clsi broth microdilution susceptibility method (m 38-a document) for amphotericin b, itraconazole, posaconazole, and voriconazole.	although standard conditions are available for testing the susceptibilities of filamentous fungi to antifungal agents by the clinical and laboratory standards institute (clsi; formerly national committee for clinical laboratory standards) broth microdilution assay, quality control (qc) mic limits have not been established for any mold-agent combination. this multicenter (eight-center) study documented the reproducibility of tests for one isolate of paecilomyces variotii atcc mya-3630 and 11 othe ...	2005	16207990
fungal isolation and identification in 21 cases of guttural pouch mycosis in horses (1998-2002).	this aetiological study of guttural pouch mycosis (gpm) in the horse was based on the retrospective study of 21 horses brought into the national veterinary school of lyon (france) between 1998 and 2002. biopsies were taken from the lesions caused by gpm during endoscopic examination. in 87% of the cases, direct examination gave positive results, whereas 43% of the cultures were found to be negative. the main fungi observed were aspergillus fumigatus (in three cases), a. versicolor (in two cases, ...	2005	15848789
an overview of the ccaat-box binding factor in filamentous fungi: assembly, nuclear translocation, and transcriptional enhancement.	filamentous fungi are frequently used for the production of industrial enzymes, since they produce a variety of enzymes including polysaccharide-degrading enzymes. among the many filamentous fungi, aspergillus species, such as a. oryzae and a. niger, are known as strong producers of amylolytic enzymes. we have been studying on the regulatory mechanisms underlying the expression of a. oryzae amylolytic genes. based on analyses using a hybrid model system of a. nidulans transformed by a gene encod ...	2005	15849404
visualizing nuclear migration during conidiophore development in aspergillus nidulans and aspergillus oryzae: multinucleation of conidia occurs through direct migration of plural nuclei from phialides and confers greater viability and early germination in aspergillus oryzae.	nuclear migration is indispensable for normal growth, differentiation, and development, and has been studied in several fungi including aspergillus nidulans and neurospora crassa. to better characterize nuclear movement and its consequences during conidiophore development, conidiation, and conidial germination, we performed confocal microscopy and time-lapse imaging on a. nidulans and aspergillus oryzae strains expressing the histone h2b-egfp fusion protein. active trafficking of nuclei from a v ...	2005	15849413
characterization of the ethanol-inducible alc gene expression system in tomato.	the efficacy of the ethanol-inducible alc transgene expression system, derived from the filamentous fungus aspergillus nidulans, has been demonstrated in transgenic tomato. two direct comparisons have been made. first, this study has utilized two transgenic lines carrying distinct reporter genes (chloramphenicol acetyltransferase and beta-glucuronidase) to distinguish aspects of induction determined by the nature of the gene/gene product rather than that of the plant. second, comparisons have be ...	2005	15851414
undecanoic acid resistance in filamentous fungi: identification and linkage mapping of the aspergillus nidulans udaa gene.		2005	15864761
co-cultivation of antifungal lactobacillus plantarum milab 393 and aspergillus nidulans, evaluation of effects on fungal growth and protein expression.	the fungal inhibitory effects of strain lactobacillus plantarum milab 393, producing broad-spectrum antifungal compounds, were evaluated. a co-cultivation method was set up to monitor effects on fungal growth and protein expression of growing aspergillus nidulans with l. plantarum milab 393. the effects of inhibitory metabolites produced by l. plantarum milab 393, cyclo(l-phe-l-pro), lactic acid and 3-phenyllactic acid, were also investigated by addition of pure compounds to the growth medium of ...	2005	15869970
transcriptome analysis of recombinant protein secretion by aspergillus nidulans and the unfolded-protein response in vivo.	filamentous fungi have a high capacity for producing large amounts of secreted proteins, a property that has been exploited for commercial production of recombinant proteins. however, the secretory pathway, which is key to the production of extracellular proteins, is rather poorly characterized in filamentous fungi compared to yeast. we report the effects of recombinant protein secretion on gene expression levels in aspergillus nidulans by directly comparing a bovine chymosin-producing strain wi ...	2005	15870366
allosteric nadp-glutamate dehydrogenase from aspergilli: purification, characterization and implications for metabolic regulation at the carbon-nitrogen interface.	nadp-dependent glutamate dehydrogenase (nadp-gdh) mediates fungal ammonium assimilation through reductive synthesis of glutamate from 2-oxoglutarate. by virtue of its position at the interface of carbon and nitrogen metabolism, biosynthetic nadp-gdh is a potential candidate for metabolic control. in order to facilitate characterization, a new and effective dye-affinity method was devised to purify nadp-gdh from two aspergilli, aspergillus niger and aspergillus nidulans. the a. niger nadp-gdh was ...	2005	15870451
the dynamic behaviour of microtubules and their contributions to hyphal tip growth in aspergillus nidulans.	creating and maintaining cell polarity are complex processes that are not fully understood. fungal hyphal tip growth is a highly polarized and dynamic process involving both f-actin and microtubules (mts), but the behaviour and roles of the latter are unclear. to address this issue, mt dynamics and subunit distribution were analysed in a strain of aspergillus nidulans expressing gfp-alpha-tubulin. apical mts are the most dynamic, the bulk of which move tipwards from multiple subapical spindle po ...	2005	15870464
assessment of ribosomal large-subunit d1-d2, internal transcribed spacer 1, and internal transcribed spacer 2 regions as targets for molecular identification of medically important aspergillus species.	molecular approaches are now being developed to provide a more rapid and objective identification of fungi compared to traditional phenotypic methods. ribosomal targets, especially the large-subunit rna gene (d1-d2 region) and internal transcribed spacers 1 and 2 (its1 and its2 regions), have shown particular promise for the molecular identification of some fungi. we therefore conducted an assessment of these regions for the identification of 13 medically important aspergillus species: aspergill ...	2005	15872227
relationship of dfg16 to the rim101p ph response pathway in saccharomyces cerevisiae and candida albicans.	many fungal ph responses depend upon conserved rim101p/pacc transcription factors, which are activated by c-terminal proteolytic processing. the means by which environmental ph is sensed by this pathway are not known. here, we report a screen of the saccharomyces cerevisiae viable deletion mutant library that has yielded a new gene required for processed rim101p accumulation, dfg16. an s. cerevisiae dfg16delta mutant expresses rim101p-repressed genes at elevated levels. in addition, candida albi ...	2005	15879523
in vivo effects of the fungicide ethaboxam on microtubule integrity in phytophthora infestans.	the effects of ethaboxam (lgc-30473), a novel thiazole carboxamide, on microtubule organization was investigated in phytophthora infestans (mont) de bary (oomycota) at the light microscope level using standard immunofluorescence and laser scanning confocal microscopy. hyphal cells were exposed to various concentrations ranging from 0.01 to 1.0 microg ml(-1) of ethaboxam at incubation times of 30, 60 and 120 min. microtubules were disrupted after exposure to ethaboxam for 30 min at 0.01 microg ml ...	2005	15880616
evolution of a large ribosomal rna multigene family in filamentous fungi: birth and death of a concerted evolution paradigm.	in eukaryotes, the primary components of the ribosome are encoded by multicopy nuclear ribosomal rna (rrna) genes: 28/26s, 18s, 5.8s, and 5s. copies of these genes are typically localized within tandem arrays and homogenized within a genome. as a result, nuclear rrna gene families have become a paradigm of concerted evolution. in filamentous fungi of the subphylum pezizomycotina, 5s rrna genes exist as a large and dispersed multigene family, with between 50 and 100 copies per genome. to determin ...	2005	15784739
genes of the thymidine salvage pathway: thymine-7-hydroxylase from a rhodotorula glutinis cdna library and iso-orotate decarboxylase from neurospora crassa.	genes for two enzymes in the thymidine salvage pathway, thymine-7-hydroxylase (thase; official name thymine dioxygenase) and iso-orotate decarboxylase (idcase) have been isolated from fungal sources. thase was isolated from a rhodotorula glutinis cdna library using a degenerate oligonucleotide based on the published amino acid sequence. the coding sequence was transferred to an escherichia coli expression system, from which recombinant thase activity was measured using 14c-labeled thymine. the t ...	2005	15794921
a gene (pks2) encoding a putative 6-methylsalicylic acid synthase from glarea lozoyensis.	a gene that encodes for a polyketide synthase (pks) was cloned from the fungus glarea lozoyensis and characterized. the gene (pks2) consists of four exons interrupted by three introns of 51, 59, and 65 bp, which are clustered at the 5' end. its predicted product is a 1791-amino-acid protein containing five catalytic motifs typical of fungal pkss, including a beta-ketosynthase, an acyltransferase, a dehydratase, a beta-ketoacyl reductase, and an acyl carrier region. the gene is transcribed from a ...	2005	15800788
determination of the essentiality of the eight cysteine residues of the nrta protein for high-affinity nitrate transport and the generation of a functional cysteine-less transporter.	all eight cysteine residues, c90, c94, c143, c147, c219, c325, c367, and c431, present in transmembrane domains of the aspergillus nidulans nrta nitrate transporter protein were altered individually by site-specific mutagenesis. the results indicate that six residues, c90, c147, c219, c325, c367, and c431, are not required for nitrate transport. although alterations of c94 and c143 are less well tolerated, these residues are not mandatory and their possible role is discussed. a series of constru ...	2005	15807540
patterns of nucleosomal organization in the alc regulon of aspergillus nidulans: roles of the alcr transcriptional activator and the crea global repressor.	we have studied the chromatin organization of three promoters of the alc regulon of aspergillus nidulans. no positioned nucleosomes are seen in the alda (aldehyde dehydrogenase) promoter under any physiological condition tested by us. in the alca (alcohol dehydrogenase i) and alcr (coding for the pathway-specific transcription factor) promoters, a pattern of positioned nucleosomes is seen under non-induced and non-induced repressed conditions. while each of these promoters shows a specific patte ...	2005	15813742
protein production and secretion in an aspergillus nidulans mutant impaired in glycosylation.	o-glycosylation has been considered a limiting factor in protein secretion in filamentous fungi. overexpression of the yeast dpm1 gene encoding dolichylphosphate mannose synthase (dpms) in an aspergillus nidulans mutant (bwb26a) deficient in o-glycosylation caused an increase in the number of secretory vesicles and changes in protein secretion. however, the secretory proteins, primarily o-mannosylated glucoamylase and n-glycosylated invertase, were mainly trapped in the periplasmic space. differ ...	2005	15827617
tobacco smoke as inducer for gas phase-controlled transgene expression in mammalian cells and mice.	capitalizing on components evolved to metabolize ethanol in aspergillus nidulans, we previously designed the first molecular gas-gene expression interface using gaseous acetaldehyde as the major inducer. this fungus-derived acetaldehyde-inducible gene regulation (air) system operated perfectly and enabled precise and reversible transgene expression dosing in a variety of mammalian cells. we now validate the use of mainstream cigarette smoke typically containing acetaldehyde at regulation-effecti ...	2005	15841470
discovery of a novel superfamily of type iii polyketide synthases in aspergillus oryzae.	identification of genes encoding type iii polyketide synthase (pks) superfamily members in the industrially useful filamentous fungus, aspergillus oryzae, revealed that their distribution is not specific to plants or bacteria. among other aspergilli (aspergillus nidulans and aspergillus fumigatus), a. oryzae was unique in possessing four chalcone synthase (chs)-like genes (csya, csyb, csyc, and csyd). expression of csya, csyb, and csyd genes was confirmed by rt-pcr. comparative genome analyses r ...	2005	15845386
development of aspergillus oryzae thia promoter as a tool for molecular biological studies.	in filamentous fungi, the repertoire of promoters available for exogenous gene expression is limited. here, we report the development and application of the thiamine-regulatable thia promoter (pthia) in aspergillus oryzae as a tool for molecular biological studies. when pthia was used to express the enhanced green fluorescent protein (egfp) reporter, the fluorescence in the mycelia was either repressed or induced in the presence or absence of thiamine in the culture media, respectively. in addit ...	2005	15727819
csma, a class v chitin synthase with a myosin motor-like domain, is localized through direct interaction with the actin cytoskeleton in aspergillus nidulans.	one of the essential features of fungal morphogenesis is the polarized synthesis of cell wall components such as chitin. the actin cytoskeleton provides the structural basis for cell polarity in aspergillus nidulans, as well as in most other eukaryotes. a class v chitin synthase, csma, which contains a myosin motor-like domain (mmd), is conserved among most filamentous fungi. the deltacsma null mutant showed remarkable abnormalities with respect to cell wall integrity and the establishment of po ...	2005	15703213
efficient implementation of a generalized pair hidden markov model for comparative gene finding.	the increased availability of genome sequences of closely related organisms has generated much interest in utilizing homology to improve the accuracy of gene prediction programs. generalized pair hidden markov models (gphmms) have been proposed as one means to address this need. however, all gphmm implementations currently available are either closed-source or the details of their operation are not fully described in the literature, leaving a significant hurdle for others wishing to advance the ...	2005	15691859
metabolically independent and accurately adjustable aspergillus sp. expression system.	filamentous fungi are well-established expression hosts often used to produce extracellular proteins of use in the food and pharmaceutical industries. the expression systems presently used in aspergillus species rely on either strong constitutive promoters, e.g., that for glyceraldehyde-3-phosphate dehydrogenase, or inducible systems derived from metabolic pathways, e.g., glaa (glucoamylase) or alc (alcohol dehydrogenase). we describe for aspergillus nidulans and aspergillus niger a novel expres ...	2005	15691916
assessment of elasticity and topography of aspergillus nidulans spores via atomic force microscopy.	previous studies have described both surface morphology and adhesive properties of fungal spores, but little information is currently available on their mechanical properties. in this study, atomic force microscopy (afm) was used to investigate both surface topography and micromechanical properties of aspergillus nidulans spores. to assess the influence of proteins covering the spore surface, wild-type spores were compared with spores from isogenic roda(+) and roda(-) strains. tapping-mode afm i ...	2005	15691953
[in vitro activity of amphotericin b, itraconazole and voriconazole against 20 species of aspergillus using the sensititre microdilution method].	the in vitro activity of antifungal agents against aspergillus has been recently investigated. we studied the susceptibility to amphotericin b, itraconazole and voriconazole of 68 strains belonging to 20 different aspergillus species.	2005	15701327
the aspergillus ph-responsive transcription factor pacc regulates virulence.	the ability of a pathogen to adapt to the host environment is usually required for the initiation of disease. here we have investigated the importance of the aspergillus nidulans pacc-mediated ph response in the pathogenesis of pulmonary aspergillosis. using mutational analysis, we demonstrate that, in neutropenic mice, elimination of the a. nidulans ph-responsive transcription factor pacc, blocking the ambient ph signal transduction pathway or prevention of pacc proteolytic processing acutely a ...	2005	15686555
a rapid method for promoter exchange in aspergillus nidulans using recombinant pcr.	recombinant pcr has been used to generate linear fragments for promoter replacement by transformation in aspergillus nidulans. a cassette vector carrying the pyr-4 non-homologous selectable marker and conditional promoter pr-alca was constructed for use as a template for pcr, and is suitable for testing the function of essential genes. two genes involved in polar growth, cota and bema, were used to assess the system. efficient targeting was possible with both genes using approximately 500bp of f ...	2005	15588991
the role of the kinesin motor kipa in microtubule organization and polarized growth of aspergillus nidulans.	polarized growth in filamentous fungi requires the integrity of the microtubule (mt) cytoskeleton. we found that growing mts in aspergillus nidulans merge at the center of fast growing tips and discovered that a kinesin motor protein, kipa, related to tea2p of schizosaccharomyces pombe, is required for this process. in a deltakipa strain, mt plus ends reach the tip but show continuous lateral movement. hyphae lose directionality and grow in curves, apparently due to mislocalization of the vesicl ...	2005	15563609
survey of simple sequence repeats in completed fungal genomes.	the use of simple sequence repeats or microsatellites as genetic markers has become very popular because of their abundance and length variation between different individuals. ssrs are tandem repeat units of 1 to 6 base pairs that are found abundantly in many prokaryotic and eukaryotic genomes. this is the first study examining and comparing ssrs in completely sequenced fungal genomes. we analyzed and compared the occurrences, relative abundance, relative density, most common, and longest ssrs i ...	2005	15563717
aspergillus nidulans hog pathway is activated only by two-component signalling pathway in response to osmotic stress.	genome sequencing analyses revealed that aspergillus nidulans has orthologous genes to all those of the high-osmolarity glycerol (hog) response mitogen-activated protein kinase (mapk) pathway of saccharomyces cerevisiae. a. nidulans mutant strains lacking sska, sskb, pbsb, or hoga, encoding proteins orthologous to the yeast ssk1p response regulator, ssk2p/ssk22p mapkkks, pbs2p mapkk and hog1p mapk, respectively, showed growth inhibition under high osmolarity, and hoga mapk in these mutants was n ...	2005	15882418
chlorhexidine digluconate induces mitotic recombination in diploid cells of aspergillus nidulans.	chlorhexidine digluconate (1,1'-hexamethylene-bis[(5-p-clorophenyl)-biguanide]) is a bisbiguanidine antiseptic, used to decrease plaque formation and to control periodontal diseases. the determination of the frequency of mitotic crossing-over constitutes a very important method for detecting carcinogenic agents.	2005	15888104
antisense inhibition of xylitol dehydrogenase gene, xdh1 from trichoderma reesei.	to inhibit xylitol dehydrogenase (xdh) in trichoderma reesei by antisense inhibition strategy and construct novel strains capable of accumulating xylitol.	2005	15892737
elastic properties of the cell wall of aspergillus nidulans studied with atomic force microscopy.	currently, little is known about the mechanical properties of filamentous fungal hyphae. to study this topic, atomic force microscopy (afm) was used to measure cell wall mechanical properties of the model fungus aspergillus nidulans. wild type and a mutant strain (deltacsma), lacking one of the chitin synthase genes, were grown in shake flasks. hyphae were immobilized on polylysine-coated coverslips and afm force--displacement curves were collected. when grown in complete medium, wild-type hypha ...	2005	15903268
antifungal protein paf severely affects the integrity of the plasma membrane of aspergillus nidulans and induces an apoptosis-like phenotype.	the small, basic, and cysteine-rich antifungal protein paf is abundantly secreted into the supernatant by the beta-lactam producer penicillium chrysogenum. paf inhibits the growth of various important plant and zoopathogenic filamentous fungi. previous studies revealed the active internalization of the antifungal protein and the induction of multifactorial detrimental effects, which finally resulted in morphological changes and growth inhibition in target fungi. in the present study, we offer de ...	2005	15917545
cytoplasmic dynein's mitotic spindle pole localization requires a functional anaphase-promoting complex, gamma-tubulin, and nudf/lis1 in aspergillus nidulans.	in aspergillus nidulans, cytoplasmic dynein and nudf/lis1 are found at the spindle poles during mitosis, but they seem to be targeted to this location via different mechanisms. the spindle pole localization of cytoplasmic dynein requires the function of the anaphase-promoting complex (apc), whereas that of nudf does not. moreover, although nudf's localization to the spindle poles does not require a fully functional dynein motor, the function of nudf is important for cytoplasmic dynein's targetin ...	2005	15930134
antioxidant activity of the melanin pigment extracted from aspergillus nidulans.	melanins are pigments of high molecular weight formed by oxidative polymerization of phenolic or indolic compounds. a number of fungi, including aspergillus nidulans, produce pigments related or identical to melanin, which are located on cell walls or exist as extracellular polymers. the aim of the present study was to assess the antioxidant activity of synthetic melanin and of the pigment extracted from the mycelium and culture medium after growth of the highly melanized strain (mel1) from a. n ...	2005	15930763
a short-term test adapted to detect the genotoxic effects of environmental volatile pollutants (benzene fumes) using the filamentous fungus aspergillus nidulans.	with the recent focus on environmental problems, increasing awareness of the harmful effects of industrial and agricultural pollution has created a demand for progressively more sophisticated pollutant and toxicity detection methods. using aspergillus nidulans strains this work presents a new short term-test that, most importantly, enables the rapid and inexpensive detection of volatile pollutants that induce genotoxic/carcinogenic effects in animals. the main aim is to contribute to environment ...	2005	15931421
abundant respirable ergot alkaloids from the common airborne fungus aspergillus fumigatus.	ergot alkaloids are mycotoxins that interact with several monoamine receptors, negatively affecting cardiovascular, nervous, reproductive, and immune systems of exposed humans and animals. aspergillus fumigatus, a common airborne fungus and opportunistic human pathogen, can produce ergot alkaloids in broth culture. the objectives of this study were to determine if a. fumigatus accumulates ergot alkaloids in a respirable form in or on its conidia, to quantify ergot alkaloids associated with conid ...	2005	15933008
changes in bacterial and fungal ocular flora of clinically normal horses following experimental application of topical antimicrobial or antimicrobial-corticosteroid ophthalmic preparations.	to determine effects of topical antimicrobial and antimicrobial-corticosteroid preparations on the ocular flora of horses. animals: 40 horses.	2005	15934607
three putative oxylipin biosynthetic genes integrate sexual and asexual development in aspergillus nidulans.	oxylipins called psi factors have been shown to alter the ratio of asexual to sexual sporulation in the filamentous fungus aspergillus nidulans. analysis of the a. nidulans genome has led to the identification of three fatty acid oxygenases (ppoa, ppob and ppoc) predicted to produce psi factors. here, it is reported that deletion of ppob (deltappob) reduced production of the oleic-acid-derived oxylipin psibbeta and increased the ratio of asexual to sexual spore development. generation of the tri ...	2005	15941990
mutational analysis of the ph signal transduction component palc of aspergillus nidulans supports distant similarity to bro1 domain family members.	the alkaline ambient ph signal transduction pathway component palc has no assigned molecular role. therefore we attempted a gene-specific mutational analysis and obtained 55 new palc loss-of-function alleles including 24 single residue substitutions. refined similarity searches reveal conserved palc regions including one with convincing similarity to the bro1 domain, denoted pcbroh, where clustering of mutational changes, including pcbroh key residue substitutions, supports its structural and/or ...	2005	15944343
multiple roles of a heterotrimeric g-protein gamma-subunit in governing growth and development of aspergillus nidulans.	vegetative growth signaling in the filamentous fungus aspergillus nidulans is primarily mediated by the heterotrimeric g-protein composed of fada (g alpha), sfad (g beta), and a presumed g gamma. analysis of the a. nidulans genome identified a single gene named gpga encoding a putative g gamma-subunit. the predicted gpga protein consists of 90 amino acids showing 72% similarity with yeast ste18p. deletion (delta) of gpga resulted in restricted vegetative growth and lowered asexual sporulation. m ...	2005	15944346
the heterotrimeric g-protein ganb(alpha)-sfad(beta)-gpga(gamma) is a carbon source sensor involved in early camp-dependent germination in aspergillus nidulans.	the role of heterotrimeric g-proteins in camp-dependent germination of conidia was investigated in the filamentous ascomycete aspergillus nidulans. we demonstrate that the g alpha-subunit ganb mediates a rapid and transient activation of camp synthesis in response to glucose during the early period of germination. moreover, deletion of individual g-protein subunits resulted in defective trehalose mobilization and altered germination kinetics, indicating that ganb(alpha)-sfad(beta)-gpga(gamma) co ...	2005	15944355
class i and class ii chitin synthases are involved in septum formation in the filamentous fungus aspergillus nidulans.	the class ii and class i chitin synthases of the filamentous fungus aspergillus nidulans are encoded by chsa and chsc, respectively. previously, we presented several lines of evidence suggesting that chsa and chsc have overlapping functions in maintaining cell wall integrity. in order to determine the functions of these chitin synthases, we employed electron and fluorescence microscopy and investigated in detail the cell wall of a deltachsa deltachsc double mutant (deltaac mutant) along with the ...	2005	15947204
the aspergillus nidulans sldi(rad50) gene interacts with bime(apc1), a homologue of an anaphase-promoting complex subunit.	the mre11-rad50-nbs1 protein complex has emerged as a central component in the human cellular dna damage response, and recent observations suggest that these proteins are at least partially responsible for the linking of dna damage detection to dna repair and cell cycle checkpoint functions. we have identified aspergillus nidulans sldi1444d mutant in a screen for dynein synthetic lethals. the sldi(rad50) gene was cloned by complementation of the sporulation deficiency phenotype of this mutant. a ...	2005	15948962
convergent evolution of hydroxylation mechanisms in the fungal kingdom: molybdenum cofactor-independent hydroxylation of xanthine via alpha-ketoglutarate-dependent dioxygenases.	the xanthine oxidases and dehydrogenases are among the most conserved enzymes in all living kingdoms. they contain the molybdopterin cofactor moco. we show here that in the fungi, in addition to xanthine dehydrogenase, a completely different enzyme is able to catalyse the oxidation of xanthine to uric acid. in aspergillus nidulans this enzyme is coded by the xana gene. we have cloned the xana gene and determined its sequence. a deletion of the gene has the same phenotype as the previously known ...	2005	15948966
swi/snf-gcn5-dependent chromatin remodelling determines induced expression of gdh3, one of the paralogous genes responsible for ammonium assimilation and glutamate biosynthesis in saccharomyces cerevisiae.	it is accepted that saccharomyces cerevisiae genome arose from complete duplication of eight ancestral chromosomes; functionally normal ploidy was recovered because of the massive loss of 90% of duplicated genes. there is evidence that indicates that part of this selective conservation of gene pairs is compelling to yeast facultative metabolism. as an example, the duplicated nadp-glutamate dehydrogenase pathway has been maintained because of the differential expression of the paralogous gdh1 and ...	2005	15948967
isolation and characterization of the aspergillus nidulans eglc gene encoding a putative beta-1,3-endoglucanase.	the aspergillus nidulans eglc gene, which encodes a putative beta-1,3-endoglucanase, was isolated from a chromosome-specific library by using an expressed sequence tag, esd0113. the eglc open reading frame encodes a 465 amino acid polypeptide, of which the amino acid sequence showed 46% similarity to that of saccharomyces cerevisiae beta-1,3-endoglucanase. the eglc transcript level at the early stages of asexual and sexual developments was dependent on the presence of the nsdd gene that encodes ...	2005	15950156
evolution of beta-lactam biosynthesis genes and recruitment of trans-acting factors.	penicillins and cephalosporins belong chemically to the group of beta-lactam antibiotics. the formation of hydrophobic penicillins has been reported in fungi only, notably penicillium chrysogenum and emericella nidulans, whereas the hydrophilic cephalosporins are produced by both fungi, e.g., acremonium chrysogenum (cephalosporin c), and bacteria. the producing bacteria include gram-negatives and gram-positives, e.g. lysobacter lactamdurans (cephabacins) and streptomyces clavuligerus (cephamycin ...	2005	15950251
the nucleobase-ascorbate transporter (nat) signature motif in uapa defines the function of the purine translocation pathway.	uapa, a member of the nat/ncs2 family, is a high affinity, high capacity, uric acid-xanthine/h+ symporter of aspergillus nidulans. we have previously presented evidence showing that a highly conserved signature motif ([q/e/p]408-n-x-g-x-x-x-x-t-[r/k/g])417 is involved in uapa function. here, we present a systematic mutational analysis of conserved residues in or close to the signature motif of uapa. we show that even the most conservative substitutions of residues q408, n409 and g411 modify the ...	2005	15953615
crea influences the metabolic fluxes of aspergillus nidulans during growth on glucose and xylose.	the physiological phenotype of aspergillus nidulans was investigated for different genetic and environmental conditions of glucose repression through the quantification of in vivo fluxes in the central carbon metabolism using (13)c-metabolic-flux analysis. the particular focus was the role of the carbon repressor crea, which is the major regulatory protein mediating carbon repression in many fungal species, in the primary metabolism of a. nidulans. batch cultivations were performed with a refere ...	2005	16000711
amino acid catabolism by an area-regulated gene encoding an l-amino acid oxidase with broad substrate specificity in aspergillus nidulans.	the filamentous fungus aspergillus nidulans can use a wide range of compounds as nitrogen sources. the synthesis of the various catabolic enzymes needed to breakdown these nitrogen sources is regulated by the area gene, which encodes a gata transcription factor required to activate gene expression under nitrogen-limiting conditions. the area102 mutation results in pleiotropic effects on nitrogen source utilization, including better growth on certain amino acids as nitrogen sources. mutations in ...	2005	16000761
aspergillus nidulans uvsbatr and scaanbs1 genes show genetic interactions during recovery from replication stress and dna damage.	the atm/atr kinases and the mre11 (mre11-rad50-nbs1) protein complex are central players in the cellular dna damage response. here we characterize possible interactions between aspergillus nidulans uvsb(atr) and the mre11 complex (scaa(nbs1)). we demonstrate that there is an epistatic relationship between uvsb(atr), the homolog of the atr/mec1 gene, and scaa(nbs1), the homolog of the nbs1/xrs2 gene, for both repair and checkpoint functions and that correct scaa(nbs1) expression during recovery f ...	2005	16002650
differential expression of the chse gene encoding a chitin synthase of aspergillus nidulans in response to developmental status and growth conditions.	expression of chse encoding one of the five chitin synthases of aspergillus nidulans was analyzed. expression of chse was moderate in conidiophores, but somewhat weaker in vegetative mycelia. during sexual development, chse was expressed strongly in young cleistothecia and hülle cells, but little in mature sexual structures. deletion of chse caused a significant decrease in the chitin content of the cell wall during early sexual development. expression of chse was increased by substituting gluco ...	2005	16006063
methylcitrate synthase from aspergillus fumigatus. propionyl-coa affects polyketide synthesis, growth and morphology of conidia.	methylcitrate synthase is a key enzyme of the methylcitrate cycle and required for fungal propionate degradation. propionate not only serves as a carbon source, but also acts as a food preservative (e280-283) and possesses a negative effect on polyketide synthesis. to investigate propionate metabolism from the opportunistic human pathogenic fungus aspergillus fumigatus, methylcitrate synthase was purified to homogeneity and characterized. the purified enzyme displayed both, citrate and methylcit ...	2005	16008561
dynamic association of topoisomerase ii to the mitotic chromosomes in live cells of aspergillus nidulans.	dna topoisomerase ii (topo ii) is an essential enzyme that catalyzes topological changes of dna and consists of a major member of mitotic chromosomes. to investigate the dynamic localization of topo ii in nuclei, we engineered the strain of aspergillus nidulans expressing topo ii fused with green fluorescent protein (gfp). time-lapse microscopy revealed that the distribution of topo ii-gfp in nuclei varied depending on the cell cycle. in interphase, topo ii-gfp distributed evenly in the nucleopl ...	2005	16009350
[frequency and distribution of variable-number tandem repeats in the genome of aspergillus niculans].	a total of 30.1 mb of publicly available dna sequence in aspergillus niculans was researched for mono- to hexanucleotide variable-number tandem repeat (vntr) to determine its type, size and frequency. a total of 4 837 vntrs were observed in whole genomic dna sequence with criteria of vntr length > 15 bp and 80% matches. considering all six classes of vntrs, they occur on average about once every 6.2 kb for mono- to hexanucleotide in genomic dna. the most abundance variable-number tandem repeat i ...	2005	16018267
characterization of the ferrichrome a biosynthetic gene cluster in the homobasidiomycete omphalotus olearius.	under iron deprivation omphalotus olearius was found to produce the hydroxamate siderophore ferrichrome a. a gene cluster consisting of three genes: fso1, a nonribosomal peptide synthetase whose expression is enhanced in the absence of iron; omo1, a l-ornithine-n(5)-monooxygenase; and ato1, an acyltransferase probably involved in the transfer of the methylglutaconyl residue to n(5)-hydroxyorinithine was identified. the fso1 sequence is interrupted by 48 introns and its derived protein sequence h ...	2005	16019163
discrepancies between recombination frequencies and physical distances in aspergillus nidulans: implications for gene identification.	a rapid route to gene molecular identification involves using recombination frequencies in locating mutational sequence changes. we describe a case where the recombination frequency is deceptively low, probably reflecting centromere proximity. recombination frequencies are greatly reduced near the centromeres on the right arms of chromosomes iii and iv of aspergillus nidulans.	2005	16020782
autoregulated, bidirectional and multicistronic gas-inducible mammalian as well as lentiviral expression vectors.	we present a novel set of autoregulated, bidirectional and multicistronic mammalian as well as lentiviral expression vectors which enable transgene expression fine-tuning by gaseous acetaldehyde. the acetaldehyde-inducible regulation (air) technology capitalizes on aspergillus nidulans components evolved to convert ethanol into metabolic energy. air is based on functional interaction of the fungal transactivator alcr and alcr-specific chimeric promoters (p(air)) which drive desired transgene exp ...	2005	16026881
biodegradation study of crop residues as affected by exogenous inorganic nitrogen and fungal inoculants.	the comparative decomposition of chickpea residue, and chopped and unchopped wheat straw was investigated in pits for 120 days. microbial biomass, humus, c/n ratio, ph, electrical conductivity (ec), dehydrogenase, alkaline phosphatase, cellulase, xylanase, total phenol and soluble protein were determined to assess their response to the addition of inorganic nitrogen and mixed fungal inoculum of aspergillus nidulans, phanerochaete chrysosporium and trichoderma viride. the evaluation of physico-ch ...	2005	16028202
comparing artificial and natural selection in rate of adaptation to genetic stress in aspergillus nidulans.	in an experimental study of adaptation to negative pleiotropic effects of a major fungicide resistance mutation in the filamentous fungus aspergillus nidulans we have investigated the relative effectiveness of artificial selection vs. natural selection on the rate of compensatory evolution. using mycelial growth rate as a fitness measure, artificial selection involved the weekly transfer of the fastest growing sector onto a fresh plate. natural selection was approximated by transferring random s ...	2005	16033548
cloning and functional analysis of the orotidine-5'-phosphate decarboxylase gene (pbrura3) of the pathogenic fungus paracoccidioides brasiliensis.	a genomic clone encoding the paracoccidioides brasiliensis orotidine monophosphate decarboxylase gene (pbrura3) was isolated by screening a subgenomic plasmid dna library of this fungus, using a pcr amplification product of the gene as a probe. sequence analysis revealed that the gene contains an open reading frame of 855 bp with a single intron (162 bp), and encodes a putative 285 amino acids polypeptide of estimated molecular weight 31.1 kda and isoelectric point 6.5. the deduced amino acid se ...	2005	16034822
application of molecular modeling to analysis of inhibition of kinesin motor proteins of the bimc subfamily by monastrol and related compounds.	application of molecular modeling approaches has potential to contribute to rational drug design. these approaches may be especially useful when attempting to elucidate the structural features associated with novel drug targets. in this study, molecular docking and molecular dynamics were applied to studies of inhibition of the human motor protein denoted hseg5 and other homologues in the bimc subfamily. these proteins are essential for mitosis, so compounds that inhibit their activity may have ...	2005	17191952
mapping the primary structure of copper/topaquinone-containing methylamine oxidase from aspergillus niger.	the amino acid sequence of methylamine oxidase (meao) from the fungus aspergillus niger was analyzed using mass spectrometry (ms). first, meao was characterized by an accurate molar mass of 72.4 kda of the monomer measured using maldi-tof-ms and by a pi value of 5.8 determined by isoelectric focusing. maldi-tof-ms revealed a clear peptide mass fingerprint after tryptic digestion, which did not provide any relevant hit when searched against a nonredundant protein database and was different from t ...	2005	16475499
agrobacterium tumefaciens-mediated transformation of mucor circinelloides.	the agrobacterium tumefaciens-mediated transformation of the zygomycetous fungus mucor circinelloides is described. a method was also developed for the hygromycin b-based selection of mucor transformants. transformation with the hygromycin b phosphotransferase gene of escherichia coli controlled by the heterologous aspergillus nidulans trpc promoter resulted in hygromycin b-resistant clones. the presence of the hygromycin resistance gene in the genome of the transformants was verified by polymer ...	2005	16475501
genomics of aspergillus fumigatus.	aspergillus fumigatus is a filamentous fungal saprophyte that is ubiquitous in the environment. it is also a human pathogen and induces allergenic response, negatively impacting health care and associated costs significantly around the world. much of the basic biology of this organism is only poorly understood, but the recent completion and publication of its genome sequence provides an excellent tool for researchers to gain insight into these processes. in this review we will summarize some of ...	2005	16499415
glass-fiber disks provide suitable medium to study polyol production and gene expression in eurotium rubrum.	eurotium species often dominate the fungal population in stored grain and are responsible for spoilage. in this study we tested the usefulness of glass fiber disks to aid the analysis of growth, polyol content and gene expression in e. rubrum in response to various water activities. growth measurements based on ergosterol content and conidial production indicated that e. rubrum grew as well at 0.86 aw as 0.98 aw. the rate of growth was considerably reduced at 0.83 aw and 0.78 aw. in contrast, un ...	2005	16457343
development of a modified positive selection medium that allows to isolate aspergillus oryzae strains cured of the integrated niad-based plasmid.	the nitrate reductase gene (niad) is the most frequently utilized as a selectable marker for homologous integration at the niad locus of aspergillus oryzae. in this study we developed a method for curing of the niad-based plasmid integrated on the a. oryzae genome. positive selection using a modified chlorate medium containing leucine as a nitrogen source enabled efficient isolation of the strains deficient in nitrate assimilation from the niad(+) transformant. pcr analysis of the strains confir ...	2005	16377911
sequencing of aspergillus nidulans and comparative analysis with a. fumigatus and a. oryzae.	the aspergilli comprise a diverse group of filamentous fungi spanning over 200 million years of evolution. here we report the genome sequence of the model organism aspergillus nidulans, and a comparative study with aspergillus fumigatus, a serious human pathogen, and aspergillus oryzae, used in the production of sake, miso and soy sauce. our analysis of genome structure provided a quantitative evaluation of forces driving long-term eukaryotic genome evolution. it also led to an experimentally va ...	2005	16372000
genome sequencing and analysis of aspergillus oryzae.	the genome of aspergillus oryzae, a fungus important for the production of traditional fermented foods and beverages in japan, has been sequenced. the ability to secrete large amounts of proteins and the development of a transformation system have facilitated the use of a. oryzae in modern biotechnology. although both a. oryzae and aspergillus flavus belong to the section flavi of the subgenus circumdati of aspergillus, a. oryzae, unlike a. flavus, does not produce aflatoxin, and its long histor ...	2005	16372010
purification and properties of an extracellular endo-1,4-beta-xylanase from penicillium citrinum and characterization of the encoding gene.	an extracellular endo-1,4-beta-xylanase was purified from the culture filtrate of a filamentous fungus penicillium citrinum ferm p-15944 grown on birch-wood xylan. the purified enzyme showed a single band on sds-page with an apparent m(r) of 20,000 and had an isoelectric point below 3.5. xylanase activity was optimal at ph 5.0 and 55 degrees c. the genomic dna and cdnas encoding this protein were cloned and sequenced. southern blot analysis indicated that the xylanase gene (xyna) was present as ...	2005	16473771
impact of fungal drug transporters on fungicide sensitivity, multidrug resistance and virulence.	drug transporters are membrane proteins that provide protection for organisms against natural toxic products and fungicides. in plant pathogens, drug transporters function in baseline sensitivity to fungicides, multidrug resistance (mdr) and virulence on host plants. this paper describes drug transporters of the filamentous fungi aspergillus nidulans (eidam) winter, botrytis cinerea pers and mycosphaerella graminicola (fückel) schroter that function in fungicide sensitivity and resistance. the f ...	2006	16475240
analysis of the aspergillus nidulans thaumatin-like ceta gene and evidence for transcriptional repression of pyr4 expression in the ceta-disrupted strain.	the asexual spore or conidium plays a critical role in the life cycle of many filamentous fungi. however, the process of conidial germination remains surprisingly obscure. to better understand this process at the molecular level we characterized the aspergillus nidulans ceta gene which is uniquely transcribed in conidiating cultures and whose transcript is significantly enriched in mature conidia. ceta is a member of a novel family of fungal genes of unknown function with homology to plant thaum ...	2006	16376592
visualization of the endocytic pathway in the filamentous fungus aspergillus oryzae using an egfp-fused plasma membrane protein.	endocytosis is an important process for cellular activities. however, in filamentous fungi, the existence of endocytosis has been so far elusive. in this study, we used aouapc-egfp, the fusion protein of a putative uric acid-xanthine permease with enhanced green fluorescent protein (egfp) in aspergillus oryzae, to examine whether the endocytic process occurs or not. upon the addition of ammonium into the medium the fusion protein was internalized from the plasma membrane. the internalization of ...	2006	16380079
flug-dependent asexual development in aspergillus nidulans occurs via derepression.	the asexual spore is one of the most crucial factors contributing to the fecundity and fitness of filamentous fungi. although the developmental activator flug was shown to be necessary for activation of asexual sporulation (conidiation) and production of the carcinogenic mycotoxin sterigmatocystin (st) in the model filamentous fungus aspergillus nidulans, the molecular mechanisms underlying the developmental switch have remained elusive. in this study, we report that the flug-mediated conidiatio ...	2006	16387865
a versatile and efficient gene-targeting system for aspergillus nidulans.	aspergillus nidulans is an important experimental organism, and it is a model organism for the genus aspergillus that includes serious pathogens as well as commercially important organisms. gene targeting by homologous recombination during transformation is possible in a. nidulans, but the frequency of correct gene targeting is variable and often low. we have identified the a. nidulans homolog (nkua) of the human ku70 gene that is essential for nonhomologous end joining of dna in double-strand b ...	2006	16387870
the gata factor area regulates localization and in vivo binding site occupancy of the nitrate activator nira.	the gata factor area is a wide-domain regulator in aspergillus nidulans with transcriptional activation and chromatin remodelling functions. area interacts with the nitrate-specific zn(2)-c(6) cluster protein nira and both proteins cooperate to synergistically activate nitrate-responsive genes. we have previously established that nira in vivo dna binding site occupancy is area dependent and in this report we provide a mechanistic explanation for our previous findings. we now show that area regul ...	2006	16390440
distinct ceramide synthases regulate polarized growth in the filamentous fungus aspergillus nidulans.	in filamentous fungi, the stabilization of a polarity axis is likely to be a pivotal event underlying the emergence of a germ tube from a germinating spore. recent results implicate the polarisome in this process and also suggest that it requires localized membrane organization. here, we employ a chemical genetic approach to demonstrate that ceramide synthesis is necessary for the formation of a stable polarity axis in the model fungus aspergillus nidulans. we demonstrate that a novel compound ( ...	2006	16394102
the presence of gc-ag introns in neurospora crassa and other euascomycetes determined from analyses of complete genomes: implications for automated gene prediction.	a combination of experimental and computational approaches was employed to identify introns with noncanonical gc-ag splice sites (gc-ag introns) within euascomycete genomes. evaluation of 2335 cdna-confirmed introns from neurospora crassa revealed 27 such introns (1.2%). a similar frequency (1.0%) of gc-ag introns was identified in fusarium graminearum, in which 3 of 292 cdna-confirmed introns contained gc-ag splice sites. computational analyses of the n. crassa genome using a gc-ag intron conse ...	2006	16406724
the aflatoxin biosynthesis cluster gene, aflx, encodes an oxidoreductase involved in conversion of versicolorin a to demethylsterigmatocystin.	biosynthesis of the toxic and carcinogenic aflatoxins by the fungus aspergillus flavus is a complicated process involving more that 27 enzymes and regulatory factors encoded by a clustered group of genes. previous studies found that three enzymes, encoded by vera, ver-1, and afly, are required for conversion of versicolorin a (va), to demethylsterigmatocystin. we now show that a fourth enzyme, encoded by the previously uncharacterized gene, aflx (ordb), is also required for this conversion. a ho ...	2006	16461654
a novel-type substrate-selectivity filter and er-exit determinants in the uapa purine transporter.	we present a functional analysis of the last alpha-helical transmembrane segment (tms12) of uapa, a uric acid-xanthine/h+ symporter in aspergillus nidulans and member of the nucleobase-ascorbate transporter (nat) family. first, we performed a systematic mutational analysis of residue f528, located in the middle of tms12, which was known to be critical for uapa specificity. substitution of f528 with non-aromatic amino acid residues (ala, thr, ser, gln, asn) did not affect significantly the kineti ...	2006	16464466
the aspergillus nidulans xprg (phog) gene encodes a putative transcriptional activator involved in the response to nutrient limitation.	the aspergillus nidulans xprg gene is involved in the regulation of extracellular proteases. a plasmid which complemented the xprg2 mutation was shown to carry the phog gene, reported to encode an acid phosphatase. two phogdelta mutants were constructed and were identical in phenotype to an xprg2 mutant. null mutants were unable to use protein as a carbon or nitrogen source, have lost a repressible acid phosphatase and have pale conidial color. xprg shows similarity to the ndt80 transcriptional ...	2006	16464624
intrinsic in vitro susceptibility of primary clinical isolates of aspergillus fumigatus, aspergillus terreus, aspergillus nidulans, candida albicans and candida lusitaniae against amphotericin b.	a total of 60 clinical fungal isolates from patients without prior amphotericin b treatment and three control strains were evaluated for their intrinsic susceptibility to amphotericin b (amb) using microdilution, etest and disc diffusion assays, on three media each, roswell park memorial institute (rpmi) 1640, antibiotic medium 3 (am3) and high resolution medium. the fungal strains included isolates of aspergillus fumigatus (n = 10), aspergillus terreus (n = 12), aspergillus nidulans (n = 9), ca ...	2006	16466441
clip-170 homologue and nude play overlapping roles in nudf localization in aspergillus nidulans.	proteins in the cytoplasmic dynein pathway accumulate at the microtubule plus end, giving the appearance of comets when observed in live cells. the targeting mechanism for nudf (lis1/pac1) of aspergillus nidulans, a key component of the dynein pathway, has not been clear. previous studies have demonstrated physical interactions of nudf/lis1/pac1 with both nude/nudel/ndl1 and clip-170/bik1. here, we have identified the a. nidulans clip-170 homologue, clipa. the clipa deletion did not cause an obv ...	2006	16467375
differential expression of aspergillus nidulans ammonium permease genes is regulated by gata transcription factor area.	the movement of ammonium across biological membranes is mediated in both prokaryotes and eukaryotes by ammonium transport proteins (amt/mep) that constitute a family of related sequences. we have previously identified two ammonium permeases in aspergillus nidulans, encoded by the meaa and mepa genes. here we show that meaa is expressed in the presence of ammonium, consistent with the function of meaa as the main ammonium transporter required for optimal growth on ammonium as a nitrogen source. i ...	2006	16467464
the phosducin-like protein phna is required for gbetagamma-mediated signaling for vegetative growth, developmental control, and toxin biosynthesis in aspergillus nidulans.	phosducin or phosducin-like protein (phlp) is a positive regulator of gbetagamma activity. the gbeta (sfad) and ggamma (gpga) subunits function in vegetative growth and developmental control in the model filamentous fungus aspergillus nidulans. to better understand the nature of gbetagamma-mediated signaling, phna, encoding an a. nidulans phlp, has been studied. deletion of phna resulted in phenotypes almost identical to those caused by deletion of sfad, i.e., reduced biomass, asexual sporulatio ...	2006	16467480
aspergillus nidulans class v and vi chitin synthases csma and csmb, each with a myosin motor-like domain, perform compensatory functions that are essential for hyphal tip growth.	the polarized synthesis of cell wall components such as chitin is essential for the hyphal tip growth of filamentous fungi. the actin cytoskeleton is known to play important roles in the determination of hyphal polarity in aspergillus nidulans. previously, we suggested that csma, a chitin synthase with a myosin motor-like domain (mmd), was involved in polarized chitin synthesis in a manner dependent on the interaction between the mmd and the actin cytoskeleton. the genome database indicates that ...	2006	16468983