| 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 |
| plasmid vectors for protein production, gene expression and molecular manipulations in aspergillus niger. | we constructed three sets of plasmids for use in aspergillus niger. these plasmids were assembled using various combinations of a series of modular dna cassettes that included a selectable marker, pyrg, derived from aspergillus nidulans; two promoter regions for directing protein expression; a cassette derived from the ama1 replicator sequence to support autonomous replication; and a reporter gene based on the a. niger laca gene. one set included integrating and autonomously replicating plasmids ... | 2004 | 15848224 |
| 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 |
| parameiosis in aspergillus nidulans in response to doxorubicin. | the recombinagenic effect of doxorubicin (an anticancer agent that impairs dna synthesis and causes chromosome breaks) was used to induce parameiotic events in aspergillus nidulans. heterokaryons formed with master strains and uvs mutants were inoculated with and without doxorubicin. haploid segregants (parameiotics and parents) and aneuploids were selected as heterokaryon-derived visible sectors. among parameiotic segregants, recombinants by intergenic mitotic crossing-over and recombinants by ... | 2004 | 15881406 |
| synthesis and biological evaluations of sulfa derivatives bearing heterocyclic moieties. | some new sulfa derivatives bearing a heterocyclic moieties fural, pyrimidinone, thiazolidinone, benzimidazole and 1,2,4-triazinone and the related compounds 2-19 have been synthesized from treatment of sulfa drugs with thioisocyanate, acid chlorides, 3-chloro-1,2,4-triazines, aldehydes, esters and/or 2-methylbenzoxazole followed by ring closure reactions. structures of the products have been deduced from their elemental analysis and spectral data. significant antimicrobial activities were observ ... | 2004 | 15881802 |
| 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 |
| beta-galactosidase formation in aspergillus nidulans. | | 2001 | 15954602 |
| [optimization of t-dna insertional mutagenesis and analysis of mutants of magnaporthe grisea]. | the rice blast fungus magnaporthe grisea causes one of the most destructive diseases of rice around the world. significant progresses have been made recently in genomics studies of the fungus, opening new era of the functional genomics which requires to generate a large scale of gene knockout mutants. it has been demonstrated that t-dna insertional mutagenesis is a powerful tool of functional genomics not only for plants but also for fungi. in this paper, we optimized the conditions for t-dna in ... | 2003 | 15969057 |
| 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 |
| in vitro activation, purification, and characterization of escherichia coli expressed aryl-alcohol oxidase, a unique h2o2-producing enzyme. | aryl-alcohol oxidase (aao), a flavoenzyme with unique spectral and catalytic properties that provides h2o2 for fungal degradation of lignin, has been successfully activated in vitro after escherichia coli expression. the recombinant aao (aao*) protein was recovered from inclusion bodies of e. coli w3110 transformed with pflag1 containing the aao cdna from pleurotus eryngii. optimization of in vitro refolding yielded 75% active enzyme after incubation of aao* protein (10 microg/ml) for 80 h (at 1 ... | 2006 | 16039872 |
| aspergillus cyclooxygenase-like enzymes are associated with prostaglandin production and virulence. | oxylipins comprise a family of oxygenated fatty acid-derived signaling molecules that initiate critical biological activities in animals, plants, and fungi. mammalian oxylipins, including the prostaglandins (pgs), mediate many immune and inflammation responses in animals. pg production by pathogenic microbes is theorized to play a role in pathogenesis. we have genetically characterized three aspergillus genes, ppoa, ppob, and ppoc, encoding fatty acid oxygenases similar in sequence to specific m ... | 2005 | 16040966 |
| virulence comparisons of aspergillus nidulans mutants are confounded by the inflammatory response of p47phox-/- mice. | while investigating the requirement for phagosomal alkalinization in the host defense against pulmonary aspergillosis, we observed high morbidity of p47(phox)(-/-) mice infected with ph-insensitive aspergillus nidulans mutants despite a paucity of fungal growth. fatal infection also resulted from a normally avirulent p-aminobenzoate auxotroph. this demonstrates that p47(phox)(-/-) murine immunity contributes significantly to a. nidulans lethality. these data have wider implications for microbial ... | 2005 | 16041040 |
| lysine is catabolized to 2-aminoadipic acid in penicillium chrysogenum by an omega-aminotransferase and to saccharopine by a lysine 2-ketoglutarate reductase. characterization of the omega-aminotransferase. | the biosynthesis and catabolism of lysine in penicillium chrysogenum is of great interest because these pathways provide 2-aminoadipic acid, a precursor of the tripeptide delta-l-2-aminoadipyl-l-cysteinyl-d-valine that is an intermediate in penicillin biosynthesis. in vivo conversion of labelled l-lysine into two different intermediates was demonstrated by hplc analysis of the intracellular amino acid pool. l-lysine is catabolized to 2-aminoadipic acid by an omega-aminotransferase and to sacchar ... | 2005 | 16049680 |
| identification and molecular cloning of a gene encoding phospholipase a2 (plaa) from aspergillus nidulans. | the plaa gene encoding a protein that contains the cytosolic phospholipase a(2) (cpla(2)) motif is cloned for the first time from the filamentous fungus, aspergillus nidulans. the translated 837 amino acid protein product of plaa comprises conserved lipase regions that are present in most mammalian cpla(2) homologs. high expression of plaa was observed in glucose-lactose medium by northern blot analyses. deletion mutants of plaa grew and formed conidia similar to the wild-type strain, but showed ... | 2005 | 16051517 |
| rnase p cleaves transient structures in some riboswitches. | rnase p from escherichia coli cleaves the coenzyme b12 riboswitch from e. coli and a similar one from bacillus subtilis. the cleavage sites do not occur in any recognizable structure, as judged from theoretical schemes that have been drawn for these 5' utrs. however, it is possible to draw a scheme that is a good representation of the e. coli cleavage site for rnase p and for the cleavage site in b. subtilis. these data indicate that transient structures are important in rnase p cleavage and in ... | 2005 | 16061811 |
| regulation of secondary metabolism in filamentous fungi. | fungal secondary metabolites are of intense interest to humankind due to their pharmaceutical (antibiotics) and/or toxic (mycotoxins) properties. in the past decade, tremendous progress has been made in understanding the genes that are associated with production of various fungal secondary metabolites. moreover, the regulatory mechanisms controlling biosynthesis of diverse groups of secondary metabolites have been unveiled. in this review, we present the current understanding of the genetic regu ... | 2005 | 16078891 |
| the csnd/csne signalosome genes are involved in the aspergillus nidulans dna damage response. | the signalosome (csn) is a conserved multiprotein complex involved in regulation of eukaryotic development and is also required to activate ribonucleotide reductase for dna synthesis. in aspergillus nidulans, csnd/csne are key regulators of sexual development. here, we investigated whether the csnd/csne genes are involved in the dna damage response in this fungus. the growth of the csnd/csne deletion mutants was reduced by subinhibitory concentrations of hydroxyurea, camptothecin, 4-nitroquinoli ... | 2005 | 16079239 |
| expression of asexual developmental regulator gene abaa is affected in the double mutants of classes i and ii chitin synthase genes, chsc and chsa, of aspergillus nidulans. | the chsa and chsc encode classes ii and i chitin synthases, respectively, of the filamentous fungus aspergillus nidulans. the deltachsa deltachsc double mutants (deltaac mutants) show defects in asexual development: a striking reduction in the number of conidiophores and aberrant conidiophore morphology. here, we examined the involvement of regulatory genes for asexual development (brla, abaa, and meda) in the conidiation defects of the deltaac mutants. spatial expression patterns of brla, abaa, ... | 2005 | 16082523 |
| the pkab gene encoding the secondary protein kinase a catalytic subunit has a synthetic lethal interaction with pkaa and plays overlapping and opposite roles in aspergillus nidulans. | filamentous fungal genomes contain two distantly related cyclic amp-dependent protein kinase a catalytic subunits (pkas), but only one pka is found to play a principal role. in aspergillus nidulans, pkaa is the primary pka that positively functions in vegetative growth and spore germination but negatively controls asexual sporulation and production of the mycotoxin sterigmatocystin. in this report, we present the identification and characterization of pkab, encoding the secondary pka in a. nidul ... | 2005 | 16087751 |
| a microtubule associated protein (hnudc) binds to the extracellular domain of thrombopoietin receptor (mpl). | human nudc (hnudc) was initially characterized as a nuclear migration protein based on the similarity of its c-terminus to that of fungal nudc from aspergillus nidulans. however, hnudc is a 331 amino acid protein whereas fungal nudc is 198 amino acids in length. the extra n-terminal portion of hnudc has no known function or homology to other proteins. in this study, we report the binding of hnudc to the extracellular domain of the thrombopoietin receptor (mpl) as detected by the yeast two-hybrid ... | 2005 | 16088917 |
| cloning and functional characterization of two bacterial members of the nat/ncs2 family in escherichia coli. | the coding potential of the genome of e. coli k-12 includes ygfo and yice, two members of the evolutionarily conserved nat/ncs2 transporter family that are highly homologous to each other (45% residue identity) and closely related to uapa of aspergillus nidulans, a most extensively studied microbial member of this family. ygfo and yice were cloned from the genome, over-expressed extrachromosomally and assayed for uptake of [(3)h]xanthine and other nucleobases, in e. coli k-12, under conditions o ... | 2005 | 16096267 |
| comparative substrate recognition by bacterial and fungal purine transporters of the nat/ncs2 family. | we compared the interactions of purines and purine analogues with representative fungal and bacterial members of the widespread nucleobase-ascorbate transporter (nat) family. these are: uapa, a well-studied xanthine-uric acid transporter of a. nidulans, xut1, a novel transporter from c. albicans, described for the first time in this work, and ygfo, a recently characterized xanthine transporter from e. coli. using transport inhibition experiments with 64 different purines and purine-related analo ... | 2005 | 16096268 |
| the ccaat-binding complex of eukaryotes: evolution of a second nls in the hapb subunit of the filamentous fungus aspergillus nidulans despite functional conservation at the molecular level between yeast, a.nidulans and human. | the heterotrimeric ccaat-binding complex is evolutionarily conserved in eukaryotic organisms, including fungi, plants and mammals. in the filamentous fungus aspergillus nidulans, the corresponding complex was designated ancf (a.nidulans ccaat-binding factor). ancf consists of the subunits hapb, hapc and hape. all three subunits are necessary for dna binding. hapb contains two putative nuclear localisation signal sequences (nlss) designated nls1 and nls2. previously, it was shown that only nls2 w ... | 2005 | 16098534 |
| aspergillus nidulans swok encodes an rna binding protein that is important for cell polarity. | the aspergillus nidulans swok1 mutant is defective in polarity maintenance when grown at restrictive temperature (38 degrees c). upon germination, the mutant extends a primary germ tube that swells to an enlarged, non-uniform cell with pronounced wall thickenings. the mutant is fully restored to wild-type growth when transformed with a plasmid containing the an5802.2 orf as designated in the broad institute a. nidulans sequence database. genetic mapping places swok in the same region of chromoso ... | 2005 | 16098776 |
| arrestin-related proteins mediate ph signaling in fungi. | metazoan arrestins bind to seven-transmembrane (7tm) receptors to regulate function. aspergillus nidulans palf, a protein involved in the fungal ambient ph signaling pathway, contains arrestin n-terminal and c-terminal domains and binds strongly to two different regions within the c-terminal cytoplasmic tail of the 7tm, putative ph sensor palh. upon exposure to alkaline ambient ph, palf is phosphorylated and, like mammalian beta-arrestins, ubiquitinated in a signal-dependent and 7tm protein-depe ... | 2005 | 16099830 |
| role of the spindle-pole-body protein apsb and the cortex protein apsa in microtubule organization and nuclear migration in aspergillus nidulans. | nuclear migration and positioning in aspergillus nidulans depend on microtubules, the microtubule-dependent motor protein dynein, and auxiliary proteins, two of which are apsa and apsb. in apsa and apsb mutants nuclei are clustered and show various kinds of nuclear navigation defects, although nuclear migration itself is still possible. we studied the role of several components involved in nuclear migration through in vivo fluorescence microscopy using fluorescent-protein tagging. because apsa l ... | 2005 | 16105883 |
| what the aspergillus genomes have told us. | the sequencing and annotation of the genomes of the first strains of aspergillus nidulans, aspergillus oryzae, and aspergillus fumigatus will be seen in retrospect as a transformational event in aspergillus biology. with this event the entire genetic composition of a. nidulans, the sexual experimental model organism of the genus aspergillus, a. oryzae, the food biotechnology organism which is the product of centuries of cultivation, and a. fumigatus, the most common causative agent of invasive a ... | 2005 | 16110785 |
| growth control and polarization. | filamentous fungi and yeasts both undergo polar growth. in saccharomyces cerevisiae, where the mechanisms for polar growth are well-understood, polarity requires three steps: establishment of cortical markers specifying the site of bud emergence; relaying the bud site information via the cdc42 rho gtpase module; and recruitment of the morphogenetic machinery needed to remodel the cell surface to the specified site. comparison of the genomes of aspergillus fumigatus, a. nidulans and a. oryzae wit ... | 2005 | 16110788 |
| benznidazole-induced genotoxicity in diploid cells of aspergillus nidulans. | genotoxic effects of benznidazole were studied by the induction of homozygosis of genes previously present in heterozygous. ut448//a757 diploid strain was used in the benznidazole's recombinagenesis test. although toxic effects on growth of colonies were not observed, 75 and 100 microm benznidazole induced an increasing of mitotic recombination events in diploid strain. results were related to the induction of chromosomal breaks by the antiparasitic drug. | 2005 | 16113877 |
| [possible sources of aspergilla infection in a hematological hospital]. | to investigate spread, species spectrum, quantity of aspergilla spores in the air of a hematological hospital. | 2005 | 16116914 |
| the flug-brla pathway contributes to the initialisation of autolysis in submerged aspergillus nidulans cultures. | the flug gene proved to be essential in the initialisation of autolysis in aspergillus nidulans (teleomorph emericella nidulans) cultures, while a loss-of-function mutation in only one out of the flbb-e genes had only minor effects on autolysis. in contrast to its important role in sporulation, brla regulated only some, but not all, elements of the autolytic process. the tightly coupled autolytic events (chitinase and proteinase production, hyphal fragmentation, disorganisation of pellets, autol ... | 2005 | 16121561 |
| the snpa, a temperature-sensitive suppressor of npga1, encodes the eukaryotic translation release factor, erf1, in aspergillus nidulans. | the npga1 mutation causes defects in the outer layer of the cell wall resulting in a colorless colony. in this study, a temperature-sensitive suppressor of npga1 named snpa was isolated by uv mutagenesis. the suppressing mutant showed pleiotropic phenotypes in cellular structure and developmental processes when incubated at a temperature of 37 degrees c or above. at 37 degrees c, multiple germ tubes emerged from germinating conidia. moreover, at 42 degrees c conidia germination was delayed more ... | 2005 | 16125337 |
| deciphering the model pathogenic fungus cryptococcus neoformans. | cryptococcus neoformans is a basidiomycete fungal pathogen of humans that has diverged considerably from other model fungi such as neurospora crassa, aspergillus nidulans, saccharomyces cerevisiae and the common human fungal pathogen candida albicans. the recent completion of the genome sequences of two related c. neoformans strains and the ongoing genome sequencing of three other divergent cryptococcus strains with different virulence phenotypes and environmental distributions should improve ou ... | 2005 | 16132036 |
| alkaline ph-induced up-regulation of the afp gene encoding the antifungal protein (afp) of aspergillus giganteus is not mediated by the transcription factor pacc: possible involvement of calcineurin. | the afp gene encoding the antifungal protein (afp) of aspergillus giganteus has a prototypical alkaline gene expression pattern, which suggests that the gene might be under the control of the ambient ph-dependent zinc-finger transcription factor pacc. this notion is corroborated by the presence in the upstream region of afp of two putative pacc binding sites, afpp1 and afpp2, which are specifically recognised by the pacc protein of a. nidulans in vitro. however, in this report we provide several ... | 2005 | 16133167 |
| fundamental contribution of beta-oxidation to polyketide mycotoxin production in planta. | seed contamination with polyketide mycotoxins, including aflatoxin (af) and sterigmatocystin (st) produced by aspergillus spp., is an agricultural, economic, and medical issue worldwide. acetyl-coa, the fundamental building block of all known fungal polyketides, is generated by a large number of biochemical pathways, including beta-oxidation of fatty acids and glycolysis of sugars. we present several lines of evidence to support a major role for seed fatty acids in formation of af and st in a. f ... | 2005 | 16134890 |
| 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 |
| structure-activity relationships and enzyme inhibition of pantothenamide-type pantothenate kinase inhibitors. | a set of novel pantothenamide-type analogues of the known staphylococcus aureus pantothenate kinase (sapank) inhibitors, n-pentyl, and n-heptylpantothenamide, was synthesized in three series. the first series of analogues (1-3) were designed as molecular probes of the pank binding site to elucidate important structure-activity relationships (sar). the second series of analogues (4-16) were designed using structural information obtained from the escherichia coli pank (ecpank) structure by targeti ... | 2006 | 16213731 |
| cloning, expression, and characterization of an oligoxyloglucan reducing end-specific xyloglucanobiohydrolase from aspergillus nidulans. | an oligoxyloglucan reducing end-specific xyloglucanobiohydrolase from the filamentous fungus aspergillus nidulans was cloned and expressed in pichia pastoris as a secreted histidine-tagged protein and purified by affinity chromatography. the enzyme acts on xyloglucan oligomers and releases the first two glycosyl residue segments from the reducing end, provided that neither the first glucose nor the xylose attached to the third glucose residue from the reducing end is not further substituted. the ... | 2005 | 16214120 |
| nuclear accumulation of the gata factor area in response to complete nitrogen starvation by regulation of nuclear export. | both the availability and the quality of nutrients affect cellular functions by controlling gene activity. area, a member of the gata family of transcription factors, globally activates expression of genes involved in nitrogen source utilization in aspergillus nidulans. the quality of the nitrogen source determines the level and activation capacity of area through controls at the level of area mrna stability and by interaction of area with the corepressor nmra. the availability of potential nitr ... | 2005 | 16215172 |
| hdaa, a major class 2 histone deacetylase of aspergillus nidulans, affects growth under conditions of oxidative stress. | histone deacetylases (hdacs) catalyze the removal of acetyl groups from the epsilon-amino group of distinct lysine residues in the amino-terminal tail of core histones. since the acetylation status of core histones plays a crucial role in fundamental processes in eukaryotic organisms, such as replication and regulation of transcription, recent research has focused on the enzymes responsible for the acetylation/deacetylation of core histones. very recently, we showed that hdaa, a member of the sa ... | 2005 | 16215180 |
| cloning and functional analysis of the aspergillus oryzae conidiation regulator gene brla by its disruption and misscheduled expression. | we cloned the brla gene from aspergillus oryzae genomic dna using the a. nidulans brla gene as a probe. a 3.1-kb ecori-bali genomic dna fragment was cloned and sequenced. the deduced amino acid sequence revealed 70% identity with a. nidulans brla and contained two c2h2 zinc finger motifs in its carboxyl terminus, and the promoter sequence contained a 43-bp highly conserved region, indicating that the cloned gene was an a. oryzae homologue of a. nidulans brla. disruption of the brla gene by homol ... | 1999 | 16232494 |
| aspergillus oryzae palbory encodes a calpain-like protease: homology to emericella nidulans palb and conservation of functional regions. | we have cloned and sequenced genomic dna of aspergillus oryzae palbory, orthologue of emericella nidulans palb, which encodes a calpain-like protease modulating a signal transduction pathway during alkaline adaptation. the deduced amino acid sequence of palbory is 70.0% identical to palb over its entire length. the regions with high similarity revealed possible domains important for their function. this is the first step towards understanding the alkaline adaptation mechanism of a. oryzae, which ... | 1999 | 16232641 |
| cloning and transcription analysis of the aspergillus aculeatus no. f-50 endoglucanase 2 (cmc2) gene. | the cmc2 gene, coding for an endoglucanase 2 (cmc2) of aspergillus aculeatus, was cloned using both genomic and cdna libraries, and sequenced. the gene consists of 1230 bp encoding a protein of 410 amino acid residues with a molecular mass of 43,697 da. the cmc2, composed of an n-terminal catalytic domain belonging to the family 5 of glycosyl hydrolases and a c-terminal cellulose-binding domain (cbd) belonging to the family i of cbds, showed identity with other fungal endoglucanases, particularl ... | 2002 | 16233338 |
| cloning and expression analysis of two catalase genes from aspergillus oryzae. | fungi contain distinct genes encoding the same class of enzyme that are differentially regulated according to conditions. we cloned two catalase genes, cata and catb, from aspergillus oryzae. the cata gene predicts a 747-amino-acid polypeptide sharing 81% identity with aspergillus fumigatus catalase (cata) and 77% with aspergillus nidulans catalase (cata). the catb gene predicts a 725-amino-acid polypeptide sharing 82% identity with a. fumigatus catalase (catb) and 75% with a. nidulans catalase ... | 2005 | 16233832 |