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Carbon monoxide oxygenase activity of cytochrome cd1
Abstract
Cytochrome cd1 from the denitrifying bacterium Pseudomonas aeruginosa catalyzes the oxygenation of carbon monoxide by dioxygen. A minimum estimate of the turnover number for this activity is 7 mol of carbon dioxide produced per hour per mole of cytochrome subunit at 30 degrees C and pH 7. The reaction is 98% inhibited by 2.5 mM cyanide, but catalase has no effect. The reaction accounts for the unusual reduction of ferric cytochrome in the presence of carbon monoxide, but no additional reducing agent. The reaction is independent of the steady-state oxidation level of the cytochrome during turnover. Under anaerobic conditions, ferricyanide plus water may substitute for dioxygen as the source of oxidizing equivalents and atomic oxygen.
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Microorganisms use oxygenase reactions to create more biodegradable forms of substrates.
“Basically, micro-organisms utilize the oxygenase reactions to create more biodegradable forms of substrates.”
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Bacterial nitrite-reducing enzymes
BRITTAIN, T., BLACKMORE, R., GREENWOOD, C., & THOMSON, A. J. (1992) · European Journal of Biochemistry · doi:10.1111/j.1432-1033.1992.tb17350.x · Cited by 105
Araujo Granda, P., Gras, A., & Ginovart, M. (2016) · Computational and Structural Biotechnology Journal · doi:10.1016/j.csbj.2016.08.001 · Cited by 9
Metadata
- Authors
- Timkovich, R., & Thrasher, J. S.
- Affiliations
- University of Alabama (US)
- ORCID
- Thrasher, Joseph S.
- Venue
- Biochemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 1988-07-12
- Volume
- 27
- Issue
- 14
- Pages
- 5383-5388
- ISSN
- 0006-2960 (ISSN-L)
- 1520-4995
- OpenAlex
- W2057617668
- Cited by
- 11
- References
- 0
- Citations by year
- 2024: 1 · 2016: 1 · 2012: 1
- FWCI
- 0.47
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Biochemistry (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of General Medical Sciences (R01GM036264)
- Topics
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Metalloenzymes and iron-sulfur proteins
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Hemoglobin structure and function
- Keywords
- cytochrome cd1, Pseudomonas aeruginosa, CO oxidation, molecular oxygen, turnover number, cyanide inhibition, denitrification, ferricyanide, anaerobic conditions
- MeSH terms
- Aldehyde Oxidoreductases, Carbon Monoxide, Catalase, Cyanides, Cytochrome c Group, Cytochromes, Nitrite Reductases, Pseudomonas aeruginosa
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