The Role of Cross-Pathway Control Regulator CpcA in the Growth and Extracellular Enzyme Production of Penicillium oxalicum
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CpcA is a conserved transcriptional activator for the cross-pathway control of amino acid biosynthetic genes in filamentous fungi. Previous studies of this regulator mainly revealed its function under amino acid starvation condition, where amino acid biosynthetic inhibitors were added in the culture. In this study, the biological function of CpcA in Penicillium oxalicum was investigated under different cultivation conditions. Disruption of cpcA led to decreased cell growth either in the presence or absence of histidine biosynthetic inhibitor, and the phenotype could be rescued by the addition of exogenous amino acid sources. In addition, CpcA was required for the rapid production of cellulase when cells were cultured on cellulose. Transcript abundance measurement showed that a set of amino acid biosynthetic genes as well as two major cellulase genes were significantly down-regulated in cpcA deletion mutant relative to wild type. Taken together, the results revealed the biological role of CpcA in supporting normal growth and extracellular enzyme production of P. oxalicum under amino acid non-starvation condition.
This work was supported by the National Key R&D Program of China (grant number 2018YFA0900503), the National Natural Science Foundation of China (31700062), the Project funded by China Postdoctoral Science Foundation (2017M612260), and the Young Scholars Program of Shandong University (YSPSDU).
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Conflict of interest
The authors declare no conflict of interest.
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