Heterologous Expression of Rhizopus Oryzae CYP509C12 Gene in Rhizopus Nigricans Enhances Reactive Oxygen Species Production and 11a-Hydroxylation Rate of 16a, 17-Epoxyprogesterone

• Published in: Mycobiology pp. 301 - 307
• Main Authors: Chaohui Shen, Xiyang Gao, Tao Li, Jun Zhang, Yuqian Gao, Liyou Qiu, Guang Zhang
• Format: Journal Article
• Language: English
• Published: 한국균학회 01.09.2019
• Subjects: 생물학
• ISSN: 1229-8093; 2092-9323
• DOI: 10.1080/12298093.2019.1630201

The 11a-hydroxylation of 16a, 17-epoxyprogesterone (EP) catalyzed by Rhizopus nigricans is crucial for the steroid industry. However, lower conversion rate of the biohydroxylation restricts its potential industrial application. The 11a-steroid hydroxylase CYP509C12 from R. oryzae were reported to play a crucial role in the 11a-hydroxylation in recombinant fission yeast. In the present study, the CYP509C12 of R. oryzae (RoCYP) was introduced into R. nigricans using the liposome-mediated mycelial transformation. Heterologous expression of RoCYP resulted in increased fungal growth and improved intracellular reactive oxygen species content in R. nigricans. The H2O2 levels in RoCYP transformants were approximately 2-folder that of the R. nigricans wild type (RnWT) strain, with the superoxide dismutase activities increased approximately 45% and catalase activities decreased approximately 68%. Furthermore, the 11a-hydroxylation rates of EP in RoCYP transformants (C4, C6 and C9) were 39.7%, 38.3% and 38.7%, which were 12.1%, 8.2% and 9.4% higher than the rate of the RnWT strain, respectively. This paper investigated the effect of heterologous expression of RoCYP in R. nigricans, providing an effective genetic method to construct the engineered strains for steroid industry. KCI Citation Count: 2