6gm4 | pdb_00006gm4

[FeFe]-hydrogenase CpI from Clostridium pasteurianum, variant S319A

spinqualitylabelsall models 6gm4, resolution 1.97Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6gm4 is a 2 chain structure with sequence from Clostridium pasteurianum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.97Å Ligands: 402, FES, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PHF1_CLOPA Publication Abstract from PubMed The unmatched catalytic turnover rates of [FeFe]-hydrogenases require an exceptionally efficient proton-transfer (PT) pathway to shuttle protons as substrates or products between bulk water and catalytic center. For clostridial [FeFe]-hydrogenase CpI such a pathway has been proposed and analyzed, but mainly on a theoretical basis. Here, eleven enzyme variants of two different [FeFe]-hydrogenases (CpI and HydA1) with substitutions in the presumptive PT-pathway are examined kinetically, spectroscopically, and crystallographically to provide solid experimental proof for its role in hydrogen-turnover. Targeting key residues of the PT-pathway by site directed mutagenesis significantly alters the pH-activity profile of these variants and in presence of H2 their cofactor is trapped in an intermediate state indicative of precluded proton-transfer. Furthermore, crystal structures coherently explain the individual levels of residual activity, demonstrating e.g. how trapped H2O molecules rescue the interrupted PT-pathway. These features provide conclusive evidence that the targeted positions are indeed vital for catalytic proton-transfer. Crystallographic and spectroscopic assignment of the proton transfer pathway in [FeFe]-hydrogenases.,Duan J, Senger M, Esselborn J, Engelbrecht V, Wittkamp F, Apfel UP, Hofmann E, Stripp ST, Happe T, Winkler M Nat Commun. 2018 Nov 9;9(1):4726. doi: 10.1038/s41467-018-07140-x. PMID:30413719 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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