3daf

The crystal structure of [Fe]-hydrogenase holoenzyme (HMD) from METHANOCALDOCOCCUS JANNASCHII cocrystallized with cyanide

spinqualitylabelsall models 3daf, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3daf is a 1 chain structure with sequence from Atcc 43067. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CMO, CYN, FE2, FEG, PO4 Related: 2boj, 3f46, 3f47 Gene: hmd, MJ0784 (ATCC 43067) Activity: 5,10-methenyltetrahydromethanopterin hydrogenase, with EC number 1.12.98.2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [HMD_METJA] Catalyzes the reversible reduction of methenyl-H(4)MPT(+) to methylene-H(4)MPT (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Biological formation and consumption of molecular hydrogen (H2) are catalyzed by hydrogenases, of which three phylogenetically unrelated types are known: [NiFe]-hydrogenases, [FeFe]-hydrogenases, and [Fe]-hydrogenase. We present a crystal structure of [Fe]-hydrogenase at 1.75 angstrom resolution, showing a mononuclear iron coordinated by the sulfur of cysteine 176, two carbon monoxide (CO) molecules, and the sp2-hybridized nitrogen of a 2-pyridinol compound with back-bonding properties similar to those of cyanide. The three-dimensional arrangement of the ligands is similar to that of thiolate, CO, and cyanide ligated to the low-spin iron in binuclear [NiFe]- and [FeFe]-hydrogenases, although the enzymes have evolved independently and the CO and cyanide ligands are not found in any other metalloenzyme. The related iron ligation pattern of hydrogenases exemplifies convergent evolution and presumably plays an essential role in H2 activation. This finding may stimulate the ongoing synthesis of catalysts that could substitute for platinum in applications such as fuel cells. The crystal structure of [Fe]-hydrogenase reveals the geometry of the active site.,Shima S, Pilak O, Vogt S, Schick M, Stagni MS, Meyer-Klaucke W, Warkentin E, Thauer RK, Ermler U Science. 2008 Jul 25;321(5888):572-5. PMID:18653896 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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