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Aspergillus nidulans

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https://www.readbyqxmd.com/read/28089630/the-aspergillus-nidulans-pbp1-homolog-is-required-for-normal-sexual-development-and-secondary-metabolism
#1
Alexandra A Soukup, Gregory J Fischer, Jerry Luo, Nancy P Keller
P bodies and stress granules are RNA-containing structures governing mRNA degradation and translational arrest, respectively. Saccharomyces cerevisiae Pbp1protein localizes to stress granules and promotes their formation and is involved in proper polyadenylation, suppression of RNA-DNA hybrids, and preventing aberrant rDNA recombination. A genetic screen for Aspergillus nidulans mutants aberrant in secondary metabolism identified the Pbp1 homolog, PbpA. Using Dcp1 (mRNA decapping) as a marker for P-body formation and FabM (Pab1, poly-A binding protein) to track stress granule accumulation, we examine the dynamics of RNA granule formation in A...
January 9, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28088615/cloning-heterologous-expression-and-biochemical-characterization-of-a-non-specific-endoglucanase-family-12-from-aspergillus-terreus-nih2624
#2
Fernando Segato, Bruno Dias, Gabriela L Berto, Dyoni M de Oliveira, Flávio H M De Souza, Matheus Augusto R N da Silva, Ana Paula Citadini, Mario T Murakami, André R L Damásio, Fábio Márcio Squina, Igor Polikarpov
The cellulases from Glycoside Hydrolyses family 12 (GH12) play an important role in cellulose degradation and plant cell wall deconstruction being widely used in a number of bioindustrial processes. Aiming to contribute toward better comprehension of these class of the enzymes, here we describe a high-yield secretion of a endoglucanase GH12 from Aspegillus terreus (AtGH12), which was cloned and expressed in Aspergillus nidulans strain A773. The purified protein was used for complete biochemical and functional characterization...
January 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28087934/fungal-cell-cycle-a-unicellular-versus-multicellular-comparison
#3
Ilkay Dörter, Michelle Momany
All cells must accurately replicate DNA and partition it to daughter cells. The basic cell cycle machinery is highly conserved among eukaryotes. Most of the mechanisms that control the cell cycle were worked out in fungal cells, taking advantage of their powerful genetics and rapid duplication times. Here we describe the cell cycles of the unicellular budding yeast Saccharomyces cerevisiae and the multicellular filamentous fungus Aspergillus nidulans. We compare and contrast morphological landmarks of G1, S, G2, and M phases, molecular mechanisms that drive cell cycle progression, and checkpoints in these model unicellular and multicellular fungal systems...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28057761/microtubules-are-reversibly-depolymerized-in-response-to-changing-gaseous-microenvironments-within-aspergillus-nidulans-biofilms
#4
Nandini Shukla, Aysha H Osmani, Stephen A Osmani
How microtubules (MTs) are regulated during fungal biofilm formation is unknown. By tracking MT +end binding proteins (+TIPS) in Aspergillus nidulans we report MTs are regulated to depolymerize within forming fungal biofilms. During this process EB1, dynein and ClipA form transient fibrous then bar-like structures, novel configurations for +TIPS. Cells also respond in an automatous manner with cells separated by a septum able to maintain different MT dynamics. Surprisingly, all cells with depolymerized MTs rapidly repolymerize their MTs after air exchange above the static culture media of biofilms...
January 5, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28053593/evaluation-of-aerial-microbial-pollutants-in-al-haram-al-nabawi-during-pilgrimage-of-2013
#5
Kholoud M Alananbeh, Nahla Boquellah, Nadia Al Kaff, Majid Al Ahmadi
Al-Madinah Al-Munawwarah is the second holiest site in Islam. The possibility of new emerging microbes is valid due to the increased number of pilgrims. The objectives of the current study were to estimate the numbers of fungi and bacteria inside and outside Al-Haram Al-Nabawi and to find whether new bacterial and fungal species have emerged compared to previous studies. Air samples were collected twice a day from 12 spots and four directions during the pilgrim year of 2013 for four consecutive weeks by using the sedimentation method...
January 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28052140/a-novel-zn2-cys6-transcription-factor-atrr-plays-a-key-role-in-an-azole-resistance-mechanism-of-aspergillus-fumigatus-by-co-regulating-cyp51a-and-cdr1b-expressions
#6
Daisuke Hagiwara, Daisuke Miura, Kiminori Shimizu, Sanjoy Paul, Ayumi Ohba, Tohru Gonoi, Akira Watanabe, Katsuhiko Kamei, Takahiro Shintani, W Scott Moye-Rowley, Susumu Kawamoto, Katsuya Gomi
Successful treatment of aspergillosis caused by Aspergillus fumigatus is threatened by an increasing incidence of drug resistance. This situation is further complicated by the finding that strains resistant to azoles, the major antifungal drugs for aspergillosis, have been widely disseminated across the globe. To elucidate mechanisms underlying azole resistance, we identified a novel transcription factor that is required for normal azole resistance in Aspergillus fungi including A. fumigatus, Aspergillus oryzae, and Aspergillus nidulans...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28051135/the-mitotic-kinesin-14-klpa-contains-a-context-dependent-directionality-switch
#7
Andrew R Popchock, Kuo-Fu Tseng, Pan Wang, P Andrew Karplus, Xin Xiang, Weihong Qiu
Kinesin-14s are commonly known as nonprocessive minus end-directed microtubule motors that function mainly for mitotic spindle assembly. Here we show using total internal reflection fluorescence microscopy that KlpA-a kinesin-14 from Aspergillus nidulans-is a context-dependent bidirectional motor. KlpA exhibits plus end-directed processive motility on single microtubules, but reverts to canonical minus end-directed motility when anchored on the surface in microtubule-gliding experiments or interacting with a pair of microtubules in microtubule-sliding experiments...
January 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/28049705/an-evolutionarily-conserved-transcriptional-activator-repressor-module-controls-expression-of-genes-for-d-galacturonic-acid-utilization-in-aspergillus-niger
#8
Jing Niu, Ebru Alazi, Ian D Reid, Mark Arentshorst, Peter J Punt, Jaap Visser, Adrian Tsang, Arthur F J Ram
The expression of genes encoding extracellular polymer-degrading enzymes and the metabolic pathways required for carbon utilization in fungi are tightly controlled. The control is mediated by transcription factors that are activated by the presence of specific inducers, which are often monomers or monomeric derivatives of the polymers. A D-galacturonic acid-specific transcription factor named GaaR was recently identified and shown to be an activator for the expression of genes involved in galacturonic acid utilization in Botrytis cinerea and Aspergillus niger Using a forward genetic screen, we isolated A...
January 2017: Genetics
https://www.readbyqxmd.com/read/28034798/phospholipid-flippases-dnfa-and-dnfb-exhibit-differential-dynamics-within-the-a-nidulans-spitzenk%C3%A3-rper
#9
Zachary Schultzhaus, Wenhui Zheng, Zonghua Wang, Rosa Mouriño-Pérez, Brian Shaw
The Spitzenkörper is a structure at the apex of growing cells in many filamentous fungi. Ultrastructural studies indicate that the Spitzenkörper is an organized mass of secretory vesicles, with different types of vesicles present in outer and inner layers. Here, we used live-cell imaging to demonstrate that the phospholipid flippases DnfA and DnfB, which preferentially localize to the outer and inner layers, respectively, exhibit different dynamics in the Spitzenkörper of Aspergillus nidulans. Additionally, deletion of dnfA partially destabilized the Spitzenkörper, while the depletion of cdc50, an essential β-subunit of most flippases, had dramatic effects on hyphal tip organization and morphology...
December 26, 2016: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28030573/cation-stress-responsive-transcription-factors-slta-and-crza-regulate-morphogenetic-processes-and-pathogenicity-of-colletotrichum-gloeosporioides
#10
Amit K Dubey, Shiri Barad, Neta Luria, Dilip Kumar, Eduardo A Espeso, Dov B Prusky
Growth of Colletotrichum gloeosporioides in the presence of cation salts NaCl and KCl inhibited fungal growth and anthracnose symptom of colonization. Previous reports indicate that adaptation of Aspergillus nidulans to salt- and osmotic-stress conditions revealed the role of zinc-finger transcription factors SltA and CrzA in cation homeostasis. Homologs of A. nidulans SltA and CrzA were identified in C. gloeosporioides. The C. gloeosporioides CrzA homolog is a 682-amino acid protein, which contains a C2H2 zinc finger DNA-binding domain that is highly conserved among CrzA proteins from yeast and filamentous fungi...
2016: PloS One
https://www.readbyqxmd.com/read/28011085/self-excising-cre-mutant-lox-marker-recycling-system-for-multiple-gene-integrations-and-consecutive-gene-deletions-in-aspergillus-oryzae
#11
Silai Zhang, Akihiko Ban, Naoki Ebara, Osamu Mizutani, Mizuki Tanaka, Takahiro Shintani, Katsuya Gomi
In this study, we developed a self-excising Cre/loxP-mediated marker recycling system with mutated lox sequences to introduce a number of biosynthetic genes into Aspergillus oryzae. To construct the self-excising marker cassette, both the selectable marker, the Aspergillus nidulans adeA gene, and the Cre recombinase gene (cre), conditionally expressed by the xylanase-encoding gene promoter, were designed to be located between the mutant lox sequences, lox66 and lox71. However, construction of the plasmid failed, possibly owing to a slight expression of cre downstream of the fungal gene promoter in Escherichia coli...
December 20, 2016: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/27999967/high-yield-production-of-aryl-alcohol-oxidase-under-limited-growth-conditions-in-small-scale-systems-using-a-mutant-aspergillus-nidulans-strain
#12
Oscar Pardo-Planas, Rolf A Prade, Mark R Wilkins
Aryl alcohol oxidase (MtGloA) is an enzyme that belongs to the ligninolytic consortium and can play an important role in the bioenergy industry. This study investigated production of an MtGloA client enzyme by a mutant strain of Aspergillus nidulans unable to synthesize its own pyridoxine. Pyridoxine limitation can be used to control cell growth, diverting substrate to protein production. In agitated culture, enzyme production was similar when using media with 1 mg/L and without pyridoxine (26.64 ± 6.14 U/mg mycelia and 26...
December 20, 2016: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/27978657/engineering-fungal-nonribosomal-peptide-synthetase-like-enzymes-by-heterologous-expression-and-domain-swapping
#13
Johannes W A van Dijk, Chun-Jun Guo, Clay C C Wang
A facile genetic methodology in the filamentous fungus Aspergillus nidulans allowed the exchange of various domains in nonribosomal peptide synthase (NRPS)-like enzymes from Aspergillus terreus. The newly generated engineered enzymes are capable of producing compounds with different chemical structures than its parent enzyme in vivo. This work provides insight in the programing of nonribosomal peptide biosynthesis in filamentous fungi.
December 16, 2016: Organic Letters
https://www.readbyqxmd.com/read/27933036/functional-analysis-of-the-nitrogen-metabolite-repression-regulator-gene-nmra-in-aspergillus-flavus
#14
Xiaoyun Han, Mengguang Qiu, Bin Wang, Wen-Bing Yin, Xinyi Nie, Qiuping Qin, Silin Ren, Kunlong Yang, Feng Zhang, Zhenhong Zhuang, Shihua Wang
In Aspergillus nidulans, the nitrogen metabolite repression (NMR) regulator NmrA plays a major role in regulating the activity of the GATA transcription factor AreA during nitrogen metabolism. However, the function of nmrA in A. flavus has not been previously studied. Here, we report the identification and functional analysis of nmrA in A. flavus. Our work showed that the amino acid sequences of NmrA are highly conserved among Aspergillus species and that A. flavus NmrA protein contains a canonical Rossmann fold motif...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27923672/functional-characterization-of-two-novel-purine-transporters-from-the-basidiomycota-phanerochaete-chrysosporium
#15
Mariana Barraco-Vega, Héctor Romero, Mariana Richero, María Pía Cerdeiras, Gianna Cecchetto
Purine transporters as substrate entry points in organisms, are involved in a number of cellular processes such as nitrogen source uptake, energy metabolism and synthesis of nucleic acids. In this study, two nucleobase transporter genes (phZ, phU) from Phanerochaete chrysosporium were cloned, identified, and functionally characterized. Our results show that PhZ is a transporter of adenine and hypoxanthine, and a protein belonging to the AzgA-like family, whilst PhU belongs to the NAT/NCS2 family, transporting xanthine and uric acid...
February 15, 2017: Gene
https://www.readbyqxmd.com/read/27917435/analysis-of-the-ionic-interaction-between-the-hydrophobin-roda-and-two-cutinases-of-aspergillus-nidulans-obtained-via-an-aspergillus-oryzae-expression-system
#16
Takumi Tanaka, Mayumi Nakayama, Toru Takahashi, Kei Nanatani, Youhei Yamagata, Keietsu Abe
Hydrophobins are amphipathic secretory proteins with eight conserved cysteine residues and are ubiquitous among filamentous fungi. In the fungus Aspergillus oryzae, the hydrophobin RolA and the polyesterase CutL1 are co-expressed when the sole available carbon source is the biodegradable polyester polybutylene succinate-co-adipate (PBSA). RolA promotes the degradation of PBSA by attaching to the particle surface, changing its structure and interacting with CutL1 to concentrate CutL1 on the PBSA surface. We previously reported that positively charged residues in RolA and negatively charged residues in CutL1 are cooperatively involved in the ionic interaction between RolA and CutL1...
December 5, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27916804/growth-phase-sterigmatocystin-formation-on-lactose-is-mediated-via-low-specific-growth-rates-in-aspergillus-nidulans
#17
Zoltán Németh, Ákos P Molnár, Balázs Fejes, Levente Novák, Levente Karaffa, Nancy P Keller, Erzsébet Fekete
Seed contamination with polyketide mycotoxins such as sterigmatocystin (ST) produced by Aspergilli is a worldwide issue. The ST biosynthetic pathway is well-characterized in A. nidulans, but regulatory aspects related to the carbon source are still enigmatic. This is particularly true for lactose, inasmuch as some ST production mutant strains still synthesize ST on lactose but not on other carbon substrates. Here, kinetic data revealed that on d-glucose, ST forms only after the sugar is depleted from the medium, while on lactose, ST appears when most of the carbon source is still available...
November 28, 2016: Toxins
https://www.readbyqxmd.com/read/27915380/proteins-interacting-with-crea-and-creb-in-the-carbon-catabolite-repression-network-in-aspergillus-nidulans
#18
Md Ashiqul Alam, Joan M Kelly
In Aspergillus nidulans, carbon catabolite repression (CCR) is mediated by the global repressor protein CreA. The deubiquitinating enzyme CreB is a component of the CCR network. Genetic interaction was confirmed using a strain containing complete loss-of-function alleles of both creA and creB. No direct physical interaction was identified between tagged versions of CreA and CreB. To identify any possible protein(s) that may form a bridge between CreA and CreB, we purified both proteins from mycelia grown in media that result in repression or derepression...
December 3, 2016: Current Genetics
https://www.readbyqxmd.com/read/27913684/transporter-oligomerization-form-and-function
#19
REVIEW
Yilmaz Alguel, Alexander D Cameron, George Diallinas, Bernadette Byrne
Transporters are integral membrane proteins with central roles in the efficient movement of molecules across biological membranes. Many transporters exist as oligomers in the membrane. Depending on the individual transport protein, oligomerization can have roles in membrane trafficking, function, regulation and turnover. For example, our recent studies on UapA, a nucleobase ascorbate transporter, from Aspergillus nidulans, have revealed both that dimerization of this protein is essential for correct trafficking to the membrane and the structural basis of how one UapA protomer can affect the function of the closely associated adjacent protomer...
December 15, 2016: Biochemical Society Transactions
https://www.readbyqxmd.com/read/27913218/methylotrophic-yeast-pichia-pastoris-as-a-chassis-organism-for-polyketide-synthesis-via-the-full-citrinin-biosynthetic-pathway
#20
Ying Xue, Chuixing Kong, Wei Shen, Chenxiao Bai, Yanna Ren, Xiangshan Zhou, Yuanxing Zhang, Menghao Cai
With the rapid development of synthetic biology, exploring various chassis organisms has become necessary to improve the heterologous biosynthesis of natural products and pharmaceuticals. In this study, we tested the potential of the industrial methylotrophic yeast strain Pichia pastoris for the heterologous synthesis of polyketides. A recombinant P. pastoris GS-pksCT-npgA carrying the Monascus purpureus citrinin polyketide synthase gene pksCT and the Aspergillus nidulans phosphopantetheinyl transferase gene npgA was constructed...
January 20, 2017: Journal of Biotechnology
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