The oxidation-reduction and electrocatalytic properties of CO dehydrogenase from Oligotropha carboxidovorans.
Biochim Biophys Acta Bioenerg
; 1861(1): 148118, 2020 01 01.
Article
em En
| MEDLINE
| ID: mdl-31734195
ABSTRACT
CO dehydrogenase (CODH) from the Gram-negative bacterium Oligotropha carboxidovorans is a complex metalloenzyme from the xanthine oxidase family of molybdenum-containing enzymes, bearing a unique binuclear Mo-S-Cu active site in addition to two [2Fe-2S] clusters (FeSI and FeSII) and one equivalent of FAD. CODH catalyzes the oxidation of CO to CO2 with the concomitant introduction of reducing equivalents into the quinone pool, thus enabling the organism to utilize CO as sole source of both carbon and energy. Using a variety of EPR monitored redox titrations and spectroelectrochemistry, we report the redox potentials of CO dehydrogenase at pHâ¯7.2 namely MoVI/V, MoV/IV, FeSI2+/+, FeSII2+/+, FAD/FADH and FADH/FADH-. These potentials are systematically higher than the corresponding potentials seen for other members of the xanthine oxidase family of Mo enzymes, and are in line with CODH utilising the higher potential quinone pool as an electron acceptor instead of pyridine nucleotides. CODH is also active when immobilised on a modified Au working electrode as demonstrated by cyclic voltammetry in the presence of CO.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Bradyrhizobiaceae
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Aldeído Oxirredutases
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Metaloproteínas
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Complexos Multienzimáticos
Idioma:
En
Revista:
Biochim Biophys Acta Bioenerg
Ano de publicação:
2020
Tipo de documento:
Article