Crystal Structure and Functional Characterization of a Cytochrome P450 (BaCYP106A2) from Bacillus sp. PAMC 23377
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- Crystal Structure and Functional Characterization of a Cytochrome P450 (BaCYP106A2) from Bacillus sp. PAMC 23377
- Other Titles
- 바실러스 PAMC 23377 균주 유래 BaCYP106A2 효소의 구조와 기능적 특성연구
- Ki-Hwa Kim
Lee, Jun Hyuck
Lee, Chang Woo
- Biotechnology & Applied Microbiology; Microbiology
- Bacillus sp.; X-ray crystallography; crystal structure; cytochrome P450; steroid hydroxylase
- Issue Date
- Ki-Hwa Kim, et al. 2017. "Crystal Structure and Functional Characterization of a Cytochrome P450 (BaCYP106A2) from Bacillus sp. PAMC 23377". JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY, 27(8): 1472-1482.
- Bacterial cytochrome P450 (CYP) steroid hydroxylases are effectively useful in the pharmaceutical industry for introducing hydroxyl groups to a wide range of steroids. We found a putative CYP steroid hydroxylase (BaCYP106A2) from the bacterium Bacillus sp. PAMC 23377 isolated from Kara Sea of the Arctic Ocean, showing 94% sequence similarity with BmCYP106A2 (Bacillus megaterium ATCC 13368). In this study, soluble BaCYP106A2 was overexpressed to evaluate its substrate-binding activity. The substrate affinity (Kd value) to 4-androstenedione was 387 ± 37 μM. Moreover, the crystal structure of BaCYP106A2 was determined at 2.7 A resolution. Structural analysis suggested that the α8？α9 loop region of BaCYP106A2 is intrinsically mobile and might be important for initial ligand binding. The hydroxyl activity of BaCYP106A2 was identified using in vitro enzyme assays. Its activity was confirmed with two kinds of steroid substrates, 4-androstenedione and nandrolone, using chromatography and mass spectrometry methods. The main products were mono-hydroxylated compounds with high conversion yields. This is the second study on the structure of CYP106A steroid hydroxylases, and should contribute new insight into the interactions of bacterial CYP106A with steroid substrates, providing baseline data for studying the CYP106A steroid hydroxylase from structural and enzymatic perspectives.
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