Catalytic Electron Transport in Chromatium Vinosum [NiFe]-Hydrogenase: Application of Voltammetry in Detecting Redox-Active Centers and Establishing That Hydrogen Oxidation Is Very Fast Even at Potentials Close to the Reversible H+/H2 Value
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TextSeries: ; BioChemistry, 38, p.8992-8999, 1999Contained works: - Pershad, H.R
- Duff, J.L.C
- Heering, H.A
- Duin, E.C
- Albracht, S.P.J
- Armstrong, F.A
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The nickel-iron hydrogenase from Chromatium Vinosum adsorbs at a pyrolytic graphite edgeplane (PGE)electrode and catalyzes rapid interconversion of H+ (aq)and H2 at potentials expected for the half-cell reaction 2H+ a H2, i.e., without the need for overpotentials. The voltammetry mirrors characteristics determined by conventional methods, while affording the capabilities for exquisite control and measurement of potential-dependent activities and substrate-product mass transport. Oxidation of H2 is extremely rapid; at 10
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