4iud

Crystal structure of an O2-tolerant [NiFe]-hydrogenase from Ralstonia eutropha in its as-isolated form with ascorbate - partly reduced state

spinqualitylabelsall models 4iud, resolution 1.45Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4iud is a 2 chain structure with sequence from Cupriavidus necator H16. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.45Å Ligands: CL, CSO, MG, S3F Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MBHL_CUPNH This enzyme recycles the H(2) produced by nitrogenase to increase the production of ATP and to protect nitrogenase against inhibition or damage by O(2) under carbon- or phosphate-limited conditions. Publication Abstract from PubMed Hydrogenases catalyze the reversible oxidation of H2 into protons and electrons and are usually readily inactivated by O2. However, a subgroup of the [NiFe] hydrogenases, including the membrane-bound [NiFe] hydrogenase from Ralstonia eutropha, has evolved remarkable tolerance toward O2 that enables their host organisms to utilize H2 as an energy source at high O2. This feature is crucially based on a unique six cysteine-coordinated [4Fe-3S] cluster located close to the catalytic center, whose properties were investigated in this study using a multidisciplinary approach. The [4Fe-3S] cluster undergoes redox-dependent reversible transformations, namely iron swapping between a sulfide and a peptide amide N. Moreover, our investigations unraveled the redox-dependent and reversible occurence of an oxygen ligand located at a different iron. This ligand is hydrogen bonded to a conserved histidine that is essential for H2 oxidation at high O2. We propose that these transformations, reminiscent of those of the P-cluster of nitrogenase, enable the consecutive transfer of two electrons within a physiological potential range. Reversible [4Fe-3S] cluster morphing in an O2-tolerant [NiFe] hydrogenase.,Frielingsdorf S, Fritsch J, Schmidt A, Hammer M, Lowenstein J, Siebert E, Pelmenschikov V, Jaenicke T, Kalms J, Rippers Y, Lendzian F, Zebger I, Teutloff C, Kaupp M, Bittl R, Hildebrandt P, Friedrich B, Lenz O, Scheerer P Nat Chem Biol. 2014 May;10(5):378-85. doi: 10.1038/nchembio.1500. Epub 2014 Apr, 6. PMID:24705592 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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