4c3o

Structure and function of an oxygen tolerant NiFe hydrogenase from Salmonella

spinqualitylabelsall models 4c3o, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4c3o is a 6 chain structure with sequence from Salty. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, F3S, F4S, MG, NFU, SF4, SO4 Activity: Ferredoxin hydrogenase, with EC number 1.12.7.2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Salmonella enterica is an opportunistic pathogen that produces a [NiFe]-hydrogenase under aerobic conditions. Here, genetic engineering approaches were used to facilitate isolation of this enzyme, termed Hyd-5. The crystal structure was determined to a resolution of 3.2 A and the hydrogenase was observed to comprise associated large and small subunits. The structure indicated that residue H229 from the large subunit was close to the proximal [4Fe-3S] cluster in the small subunit. In addition, H229 was observed to lie close to a buried glutamic acid (E73), which is conserved in oxygen-tolerant hydrogenases. Residues H229 and E73 of the Hyd-5 large subunit were found to be important in both hydrogen oxidation activity and the oxygen tolerance mechanism. Substitution of H229 or E73 with alanine led to a loss in the ability of Hyd-5 to oxidise hydrogen in air. Furthermore, the H229A variant was found to have lost the overpotential requirement for activity that is always observed with oxygen-tolerant [NiFe]-hydrogenases. It is possible that H229 has a role in stabilising the super-oxidised form of the proximal cluster in the presence of oxygen, and it is proposed that E73 could play a supporting role in fine-tuning the chemistry of H229 to enable this function. How the structure of the large subunit controls function in an oxygen-tolerant [NiFe]-hydrogenase.,Bowman L, Flanagan L, Fyfe PK, Parkin A, Hunter WN, Sargent F Biochem J. 2014 Jan 16. PMID:24428762 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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