Infrared Studies of Carbon Monoxide Binding to Carbon Monoxide Dehydrogenase/Acetyl-CoA Synthase from Moorella thermoacetica

Jingyi Chen, Shan Huang, Javier Seravalli, Howard Gutzman, Derrick J. Swartz, Stephen W. Ragsdale, Kimberly A. Bagley

Research output: Contribution to journalArticle

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Abstract

Carbon monoxide dehydrogenase/acetyl-CoA synthase (CODH/ACS) is a bifunctional enzyme that catalyzes the reversible reduction of carbon dioxide into carbon monoxide and the coupled synthesis of acetyl-CoA from the carbon monoxide produced. Exposure of CODH/ACS from Moorella thermoacetica to carbon monoxide gives rise to several infrared bands in the 2100-1900 cm-1 spectral region that are attributed to the formation of metal-coordinated carbon monoxide species. Infrared bands attributable to M-CO are not detected in the as-isolated enzyme, suggesting that the enzyme does not contain intrinsic metal-coordinated CO ligands. A band detected at 1996 cm-1 in the CO-flushed enzyme is assigned as arising from CO binding to a metal center in cluster A of the ACS subunit. The frequency of this band is most consistent with it arising from a terminally coordinated Ni(I) carbonyl. Multiple infrared bands at 2078, 2044, 1970, 1959, and 1901 cm-1 are attributed to CO binding at cluster C of the CODH subunit. All infrared bands attributed to metal carbonyls decay in a time-dependent fashion as CO 2 appears in the solution. These observations are consistent with the enzyme-catalyzed oxidation of carbon monoxide until it is completely depleted from solution during the course of the experiments.

Original languageEnglish (US)
Pages (from-to)14822-14830
Number of pages9
JournalBiochemistry
Volume42
Issue number50
DOIs
StatePublished - Dec 23 2003

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carbon monoxide dehydrogenase
Moorella
Acetyl Coenzyme A
Carbon Monoxide
Infrared radiation
Metals
Enzymes

ASJC Scopus subject areas

  • Biochemistry

Cite this

Infrared Studies of Carbon Monoxide Binding to Carbon Monoxide Dehydrogenase/Acetyl-CoA Synthase from Moorella thermoacetica. / Chen, Jingyi; Huang, Shan; Seravalli, Javier; Gutzman, Howard; Swartz, Derrick J.; Ragsdale, Stephen W.; Bagley, Kimberly A.

In: Biochemistry, Vol. 42, No. 50, 23.12.2003, p. 14822-14830.

Research output: Contribution to journalArticle

Chen, Jingyi ; Huang, Shan ; Seravalli, Javier ; Gutzman, Howard ; Swartz, Derrick J. ; Ragsdale, Stephen W. ; Bagley, Kimberly A. / Infrared Studies of Carbon Monoxide Binding to Carbon Monoxide Dehydrogenase/Acetyl-CoA Synthase from Moorella thermoacetica. In: Biochemistry. 2003 ; Vol. 42, No. 50. pp. 14822-14830.
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