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- 저자 : István Pócsi (검색결과 3 건)
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Antifungal Activity of Extracellular Hydrolases Produced by Autolysing Aspergillus nidulans Cultures
Melinda Szilágyi,Fruzsina Anton,Katalin Forgács,유재혁,István Pócsi,Tamás Emri 한국미생물학회 2012 The journal of microbiology Vol.50 No.5
Carbon-starving Aspergillus nidulans cultures produce high activities of versatile hydrolytic enzymes and, among these,ChiB endochitinase and EngA β-1,3-endoglucanase showed significant antifungal activity against various fungal species. Double deletion of engA and chiB diminished the antifungal activity of the fermentation broths and increased conidiogenesis and long-term viability of A. nidulans, but decreased the growth rate on culture media containing weak carbon sources. Production of ChiB and EngA can influence fungal communities either directly due to their antifungal properties or indirectly through their effects on vegetative growth. Our data suggest saprophytic fungi as promising future candidates to develop novel biocontrol technologies.
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Orosz, Erzsé,bet,Antal, Ká,roly,Gazdag, Zoltá,n,Szabó,, Zsuzsa,Han, Kap-Hoon,Yu, Jae-Hyuk,Pó,csi, Istvá,n,Emri, Tamá,s Hindawi 2017 International journal of genomics Vol.2017 No.-
<P>To better understand the molecular functions of the master stress-response regulator AtfA in <I>Aspergillus nidulans</I>, transcriptomic analyses of the <I>atfA</I> null mutant and the appropriate control strains exposed to menadione sodium bisulfite- (MSB-), <I>t</I>-butylhydroperoxide- and diamide-induced oxidative stresses were performed. Several elements of oxidative stress response were differentially expressed. Many of them, including the downregulation of the mitotic cell cycle, as the MSB stress-specific upregulation of FeS cluster assembly and the MSB stress-specific downregulation of nitrate reduction, tricarboxylic acid cycle, and ER to Golgi vesicle-mediated transport, showed AtfA dependence. To elucidate the potential global regulatory role of AtfA governing expression of a high number of genes with very versatile biological functions, we devised a model based on the comprehensive transcriptomic data. Our model suggests that an important function of AtfA is to modulate the transduction of stress signals. Although it may regulate directly only a limited number of genes, these include elements of the signaling network, for example, members of the two-component signal transduction systems. AtfA acts in a stress-specific manner, which may increase further the number and diversity of AtfA-dependent genes. Our model sheds light on the versatility of the physiological functions of AtfA and its orthologs in fungi.</P>
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