The distinctive regulatory roles of PrtT in the cell metabolism of Penicillium oxalicum

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• 作者：Ling Chen ; Gen Zou ; Lei Zhang ; Ronald P. de Vries ; Xing Yan ; Jun Zhang ; Rui Liu ; Chengshu Wang ; Yinbo Qu ; Zhihua Zhou
• 关键词：Penicillium oxalicum ; PrtT ; Gene regulation ; Nutrient limitation ; Cell metabolism
• 刊名：Fungal Genetics and Biology
• 出版年：February, 2014
• 年：2014
• 卷：63
• 期：Complete
• 页码：42-54
• 全文大小：2602 K

文摘

PrtT is a fungal-specific transcription activator of extracellular proteases in Aspergilli. In this study, the roles of the PrtT homolog from Penicillum oxalicum was investigated by transcription profiling in combination with electrophoretic mobility shift assay (EMSA). The prtT deletion dramatically reduced extracellular protease activities and caused intracellular nutrient limitation when cultured on casein as the sole carbon source. PrtT was found to directly regulate the expression of an intracellular peptidase encoding gene (tripeptidyl-peptidase) and the gene encoding the extracellular dipeptidyl-aminopeptidase V, in addition to the expected extracellular peptidase genes (carboxypeptidase and aspergillopepsin). Five amylase genes (伪-amylase, glucoamylase, 伪-glucosidase) and three major facilitator superfamily transporter genes related to maltose, monosaccharide and peptide transporting were also confirmed as putative targets of PrtT by EMSA. In contrast, the transcription levels of other genes encoding polysaccharide degrading enzymes (e.g. cellulases) and most iron or multidrug transporter encoding genes were up- or down-regulated in the 螖prtT mutant due to nutrient limitation resulting from the reduced usage of the sole carbon source, casein. These results deepen the understanding of the interaction of regulation systems for nitrogen and carbon catabolism, which benefit strain improvement of P. oxalicum for industrial enzyme production.