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Penicillium decumbens BrlA extensively regulates secondary metabolism and functionally associates with the expression of cellulase genes

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Abstract

Penicillium decumbens has been used in the industrial production of lignocellulolytic enzymes in China for more than 15 years. Conidiation is essential for most industrial fungi because conidia are used as starters in the first step of fermentation. To investigate the mechanism of conidiation in P. decumbens, we generated mutants defective in two central regulators of conidiation, FluG and BrlA. Deletion of fluG resulted in neither “fluffy” phenotype nor alteration in conidiation, indicating possible different upstream mechanisms activating brlA between P. decumbens and Aspergillus nidulans. Deletion of brlA completely blocked conidiation. Further investigation of brlA expression in different media (nutrient-rich or nutrient-poor) and different culture states (liquid or solid) showed that brlA expression is required but not sufficient for conidiation. The brlA deletion strain exhibited altered hyphal morphology with more branches. Genome-wide expression profiling identified BrlA-dependent genes in P. decumbens, including genes previously reported to be involved in conidiation as well as previously reported chitin synthase genes and acid protease gene (pepB). The expression levels of seven secondary metabolism gene clusters (from a total of 28 clusters) were drastically regulated in the brlA deletion strain, including a downregulated cluster putatively involved in the biosynthesis of the mycotoxins roquefortine C and meleagrin. In addition, the expression levels of most cellulase genes were upregulated in the brlA deletion strain detected by real-time quantitative PCR. The brlA deletion strain also exhibited an 89.1 % increase in cellulase activity compared with the wild-type strain. The results showed that BrlA in P. decumbens not only has a key role in regulating conidiation, but it also regulates secondary metabolism extensively as well as the expression of cellulase genes.

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Acknowledgments

We thank the grants from National Basic Research Program of China (Grant no. 2011CB707403), National Natural Sciences Foundation of China (Grant no. 31030001 and 31370086).

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  1. National Glycoengineering Research Center, Shandong University, 27, Shanda South Road, Jinan, Shandong, 250100, China

    Yuqi Qin & Yinbo Qu

  2. State Key Laboratory of Microbial Technology, Shandong University, 27, Shanda South Road, Jinan, Shandong, 250100, China

    Yuqi Qin, Longfei Bao, Meirong Gao, Mei Chen, Yunfeng Lei, Guodong Liu & Yinbo Qu

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  1. Yuqi Qin
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Qin, Y., Bao, L., Gao, M. et al. Penicillium decumbens BrlA extensively regulates secondary metabolism and functionally associates with the expression of cellulase genes. Appl Microbiol Biotechnol 97, 10453–10467 (2013). https://doi.org/10.1007/s00253-013-5273-3

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