Tryptophan-96 in cytochrome P450 BM3 plays a key role in enzyme survival
Abstract
Flavocytochrome P450 from Bacillus megaterium (P450BM3) is a natural fusion protein containing reductase and heme domains. In the presence of NADPH and dioxygen the enzyme catalyzes the hydroxylation of long-chain fatty acids. Analysis of the P450BM3 structure reveals chains of closely spaced tryptophan and tyrosine residues that might serve as pathways for high-potential oxidizing equivalents to escape from the heme active site when substrate oxidation is not possible. Our investigations of the total number of enzyme turnovers before deactivation have revealed that replacement of selected tryptophan and tyrosine residues with redox inactive groups leads to a twofold reduction in enzyme survival time. Tryptophan-96 is critical for prolonging enzyme activity, suggesting a key protective role for this residue.
Additional Information
This research was supported by the National Institute of Diabetes and Digestive and Kidney Diseases of the National Institutes of Health under Award Number R01DK019038. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. Additional support was provided by the Arnold and Mabel Beckman Foundation.Copyright and License
© 2022 Federation of European Biochemical Societies.
Contributions
Raheleh Ravanfar: experimental investigations; data analysis; writing and editing manusctipt Yuling Sheng: experimental investigations Harry B. Gray: writing and editing manuscrpt Jay R. Winkler: methodology; data analysis; writing and editing manuscript.
Data Availability
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Additional details
- Eprint ID
- 117755
- Resolver ID
- CaltechAUTHORS:20221107-999291600.27
- DOI
- 10.1002/1873-3468.14514
- PMCID
- PMC9839481
- R01DK019038
- NIH
- Arnold and Mabel Beckman Foundation
- Created
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2022-11-18Created from EPrint's datestamp field
- Updated
-
2023-01-25Created from EPrint's last_modified field