6kob

X-ray Structure of the proton-pumping cytochrome aa3-600 menaquinol oxidase from Bacillus subtilis

spinqualitylabelsall models 6kob, resolution 3.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6kob is a 8 chain structure with sequence from Bacillus subtilis and Bacillus subtilis subsp. subtilis str. 168. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.6Å Ligands: CU, HEA, MQ7 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function QOX3_BACSU Catalyzes quinol oxidation with the concomitant reduction of oxygen to water. Major component for energy conversion during vegetative growth (By similarity). Publication Abstract from PubMed Virtually all proton-pumping terminal respiratory oxygen reductases are members of the heme-copper oxidoreductase superfamily. Most of these enzymes use reduced cytochrome c as a source of electrons, but a group of enzymes have evolved to directly oxidize membrane-bound quinols, usually menaquinol or ubiquinol. All of the quinol oxidases have an additional transmembrane helix (TM0) in subunit I that is not present in the related cytochrome c oxidases. The current work reports the 3.6-A-resolution X-ray structure of the cytochrome aa 3 -600 menaquinol oxidase from Bacillus subtilis containing 1 equivalent of menaquinone. The structure shows that TM0 forms part of a cleft to accommodate the menaquinol-7 substrate. Crystals which have been soaked with the quinol-analog inhibitor HQNO (N-oxo-2-heptyl-4-hydroxyquinoline) or 3-iodo-HQNO reveal a single binding site where the inhibitor forms hydrogen bonds to amino acid residues shown previously by spectroscopic methods to interact with the semiquinone state of menaquinone, a catalytic intermediate. Structure of the cytochrome aa 3 -600 heme-copper menaquinol oxidase bound to inhibitor HQNO shows TM0 is part of the quinol binding site.,Xu J, Ding Z, Liu B, Yi SM, Li J, Zhang Z, Liu Y, Li J, Liu L, Zhou A, Gennis RB, Zhu J Proc Natl Acad Sci U S A. 2020 Jan 14;117(2):872-876. doi:, 10.1073/pnas.1915013117. Epub 2019 Dec 30. PMID:31888984 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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