CreA-independent carbon catabolite repression of cellulase genes by trimeric G-protein and protein kinase A in Aspergillus nidulans

Current Genetics
Emi KunitakeTetsuo Kobayashi

Abstract

Cellulase production in filamentous fungi is repressed by various carbon sources. In our preliminary survey in Aspergillus nidulans, degree of de-repression differed depending on carbon sources in a mutant of creA, encoding the transcriptional repressor for carbon catabolite repression (CCR). To further understand mechanisms of CCR of cellulase production, we compared the effects of creA deletion with deletion of protein kinase A (pkaA) and G (ganB) genes, which constitute a nutrient sensing and signaling pathway. In plate culture with carboxymethyl cellulose and D-glucose, deletion of pkaA and ganB, but not creA, led to significant de-repression of cellulase production. In submerged culture with cellobiose and D-glucose or 2-deoxyglucose, both creA or pkaA single deletion led to partial de-repression of cellulase genes with the highest level by their double deletion, while ganB deletion caused de-repression comparable to that of the creA/pkaA double deletion. With ball-milled cellulose and D-glucose, partial de-repression was detected by deletion of creA but not of pkaA or ganB. The creA/pkaA or creA/ganB double deletion led to earlier expression than the creA deletion. Furthermore, the effect of each deletion with D-xylose or...Continue Reading

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Apr 15, 2018·Current Genetics·Kana IshikawaTetsuo Kobayashi

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Citations

Jun 5, 2019·Bioscience, Biotechnology, and Biochemistry·Katsuya Gomi
Oct 6, 2019·Applied and Environmental Microbiology·Paul DalyRonald P de Vries
Aug 1, 2020·Frontiers in Bioengineering and Biotechnology·Teng ZhangChun Li
Jun 11, 2021·Frontiers in Microbiology·Mizuki Tanaka, Katsuya Gomi

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Methods Mentioned

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