[NiFe]-hydrogenases revisited: nickel-carboxamido bond formation in a variant with accrued O2-tolerance and a tentative re-interpretation of Ni-SI states.

Abstract excerpt

[NiFe]-hydrogenases are well-studied enzymes capable of oxidizing molecular hydrogen and reducing protons. EPR and FTIR spectroscopic studies have shown that these enzymes can be isolated in several redox states that include paramagnetic oxidized inactive Ni-A and Ni-B species and a reduced Ni-C form. The latter and the diamagnetic respectively more oxidized Ni-SI and more reduced Ni-R forms are generally thought...

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