Abstract:The H-cluster is the catalytic cofactor of [FeFe]-hydrogenase, a metalloenzyme that catalyzes the production of hydrogen gas (H2). The H-cluster carries two cyanide and three carbon monoxide ligands, making it an excellent target for IR spectroscopy. In previous work, we identified an oxidized and protonated H-cluster species, whose IR signature differs from the oxidized resting state (Hox) by a small but distinct shift to higher frequencies. This ‘blue shift’ was explained by a protonation at the [4Fe-4S] sub… Show more
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