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. Author manuscript; available in PMC: 2016 Feb 10.
Published in final edited form as: Nat Commun. 2015 Aug 10;6:7890. doi: 10.1038/ncomms8890

Figure 1. The Ni-R reduced state of [NiFe]-hydrogenase.

Figure 1

a, X-ray structure of the DvMF [NiFe]-hydrogenase active site from PDB entry 1WUI62. The bridging ligand X is oxygenic for deactivated states, with catalytically active states having either a hydride or a vacant site. b–d, Some of the structures proposed for isoelectronic Ni-R forms19–26.