8HG9

Cytochrome P450 steroid hydroxylase (BaCYP106A6) from Bacillus species

Summary for 8HG9

• Entry DOI: 10.2210/pdb8hg9/pdb
• Descriptor: cytochrome P450 steroid hydroxylase, PROTOPORPHYRIN IX CONTAINING FE (3 entities in total)
• Functional Keywords: cytochrome p450, steroid hydroxylase, hormone
• Biological source: Bacillus sp. (in: Bacteria)
• Total number of polymer chains: 2
• Total formula weight: 95609.79

Authors

Do, H.,Lee, J.H. (deposition date: 2022-11-14, release date: 2023-07-26, Last modification date: 2024-05-29)

Primary citation

Kim, K.H.,Do, H.,Lee, C.W.,Subedi, P.,Choi, M.,Nam, Y.,Lee, J.H.,Oh, T.J.
Crystal Structure and Biochemical Analysis of a Cytochrome P450 Steroid Hydroxylase ( Ba CYP106A6) from Bacillus Species.
J Microbiol Biotechnol., 33:387-397, 2023

PubMed Abstract: Cytochrome P450 (CYP) is a heme-containing enzyme that catalyzes hydroxylation reactions with various substrate molecules. Steroid hydroxylases are particularly useful for effectively introducing hydroxyl groups into a wide range of steroids in the pharmaceutical industry. This study reports a newly identified CYP steroid hydroxylase (CYP106A6) from the bacterium sp. and characterizes it using an in vitro enzyme assay and structural investigation. Bioconversion assays indicated that CYP106A1 catalyzes the hydroxylation of progesterone and androstenedione, whereas no or low conversion was observed with 11β-hydroxysteroids such as cortisol, corticosterone, dexamethasone, and prednisolone. In addition, the crystal structure of CYP106A6 was determined at a resolution of 2.8 Å to investigate the configuration of the substrate-binding site and understand substrate preference. This structural characterization and comparison with other bacterial steroid hydroxylase CYPs allowed us to identify a unique Arg295 residue that may serve as the key residue for substrate specificity and regioselectivity in CYP106A6. This observation provides valuable background for further protein engineering to design commercially useful CYP steroid hydroxylases with different substrate specificities.

PubMed: 36655276
DOI: 10.4014/jmb.2211.11031

Experimental method

X-RAY DIFFRACTION (2.79 Å)