Cloning and expression of the gene cluster encoding key proteins involved in acetyl-CoA synthesis in Clostridium thermoaceticum: CO dehydrogenase, the corrinoid/Fe-S protein, and methyltransferase
Open accessAbstract
Acetogenic bacteria fix CO or CO2 by a pathway of autotrophic growth called the acetyl-CoA (or Wood) pathway. Key enzymes in the pathway are a methyltransferase, a corrinoid/Fe-S protein, a disulfide reductase, and a carbon monoxide dehydrogenase. This manuscript describes the isolation of the genes that code for the methyltransferase, the two subunits of the corrinoid/Fe-S protein, and the two subunits of carbon monoxide dehydrogenase. These five genes were found to be clustered within an approximately 10-kilobase segment on the Clostridium thermoaceticum genome. The proteins were expressed at up to 5-10% of Escherichia coli cell protein, and isopropyl beta-D-thiogalactopyranoside had no effect on the levels of expression, implying that the C. thermoaceticum inserts contained transcriptional and translational signals that were recognized by E. coli. The methyltransferase is expressed in E. coli in a fully active dimeric form with a specific activity and heat stability similar to the enzyme expressed in C. thermoaceticum. However, both the corrinoid/Fe-S protein and carbon dioxide dehydrogenase, although expressed in high amounts and with identical subunit molecular weights in E. coli, are inactive and less heat stable than are the native enzymes from C. thermoaceticum.
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- Authors
- Roberts, D. L., James-Hagstrom, J. E., Garvin, D. K., Gorst, C. M., Runquist, J. A., Baur, J. R., Haase, F. C., & Ragsdale, S. W.
- Affiliations
- University of Wisconsin–Milwaukee (US)
- ORCID
- Ragsdale, S W
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 1989-01
- Volume
- 86
- Issue
- 1
- Pages
- 32-36
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC286397
- OpenAlex
- W2022642835
- Cited by
- 56
- References
- 28
- Citations by year
- 2024: 1 · 2023: 1 · 2021: 1 · 2020: 1 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 3 · 2013: 1 · 2012: 1
- FWCI
- 7.00
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5r29gm039451-02)
- National Institute of General Medical Sciences (1-R29-GM39451)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Metalloenzymes and iron-sulfur proteins
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial metabolism and enzyme function
- Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
- Keywords
- Clostridium thermoaceticum, acetyl-CoA biosynthesis, acetogenic bacteria, gene clusters, carbon monoxide dehydrogenase, methyltransferase, heterologous expression in Escherichia coli, enzyme thermostability, enzyme activity
- MeSH terms
- Acetyl Coenzyme A, Aldehyde Oxidoreductases, Amino Acid Sequence, Clostridium, DNA, Bacterial, Genes, Genes, Bacterial, Multigene Family, Iron-Sulfur Proteins, Metalloproteins, Methyltransferases, Molecular Sequence Data, Multienzyme Complexes, Nucleic Acid Hybridization, Plasmids, Vitamin B 12, Restriction Mapping, Corrinoids
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