羟基化
细胞色素P450
区域选择性
化学
立体化学
生物化学
酶
生物
催化作用
作者
Min-Woo Woo,Bo Ram Lee,Hee-Ju Nah,Si-Sun Choi,Shengying Li,Eung-Soo Kim
出处
期刊:Journal of Microbiology and Biotechnology
[Journal of Microbiology and Biotechnology]
日期:2015-10-28
卷期号:25 (10): 1634-1639
被引量:2
标识
DOI:10.4014/jmb.1505.05034
摘要
Cytochrome P450 hydroxylase (CYP) in actinomycetes plays an important role in the biosynthesis and bioconversion of various secondary metabolites. Two unique CYPs named CYP-sb21 and CYP-pa1, which were identified from Sebekia benihana and Pseudonocardia autotrophica, respectively, were proven to transfer a hydroxyl group at the 4(th) or 9(th) N-methyl leucine position of immunosuppressive agent cyclosporin A (CsA). Interestingly, these two homologous CYPs showed different CsA regio-selectivities. CYP-sb21 exhibited preferential hydroxylation activity at the 4(th) position over the 9(th) position, whereas CYP-pa1 showed the opposite preference. To narrow down the CYP domain critical for CsA regio-selectivity, each CYP was divided into four domains, and each domain was swapped with its counterpart from the other CYP. A total of 18 hybrid CYPs were then individually tested for CsA regioselectivity. Although most of the hybrid CYPs failed to exhibit a significant change in regioselectivity in the context of CsA hydroxylation, hybrid CYP-pa1 swapped with the second domain of CYP-sb21 showed a higher preference for the 9th position. Moreover, hybrid CYPsb21 containing seven amino acids from the 2nd domain of CYP-pa1 showed higher preference for the 4(th) position. These results imply that the 2nd domain of CsA-specific CYP plays a critical role in CsA regio-selectivity, thereby setting the stage for biotechnological application of CsA regio-selective hydroxylation.
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