6rx4 | pdb_00006rx4

THE STRUCTURE OF BD OXIDASE FROM ESCHERICHIA COLI

Loading... Status: waiting for Mol* initialization Structural highlights 6rx4 is a 4 chain structure with sequence from Ecoli and Escherichia coli k-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HDD, HEB, PEE, UQ8 NonStd Res: UNK Activity: Ubiquinol oxidase (electrogenic, proton-motive force generating), with EC number 7.1.1.7 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CYDA_ECOLI] A terminal oxidase that produces a proton motive force by the vectorial transfer of protons across the inner membrane. It is the component of the aerobic respiratory chain of E.coli that predominates when cells are grown at low aeration. Generates a proton motive force using protons and electrons from opposite sides of the membrane to generate H(2)O, transferring 1 proton/electron. [CYDX_ECOLI] Required for correct functioning of cytochrome bd-I oxidase. This protein and AppX may have some functional overlap. [CYDB_ECOLI] A terminal oxidase that produces a proton motive force by the vectorial transfer of protons across the inner membrane. It is the component of the aerobic respiratory chain of E.coli that predominates when cells are grown at low aeration. Generates a proton motive force using protons and electrons from opposite sides of the membrane to generate H(2)O, transferring 1 proton/electron. Publication Abstract from PubMed Cytochrome bd oxidases are terminal reductases of bacterial and archaeal respiratory chains. The enzyme couples the oxidation of ubiquinol or menaquinol with the reduction of dioxygen to water, thus contributing to the generation of the protonmotive force. Here, we determine the structure of the Escherichia coli bd oxidase treated with the specific inhibitor aurachin by cryo-electron microscopy (cryo-EM). The major subunits CydA and CydB are related by a pseudo two fold symmetry. The heme b and d cofactors are found in CydA, while ubiquinone-8 is bound at the homologous positions in CydB to stabilize its structure. The architecture of the E. coli enzyme is highly similar to that of Geobacillus thermodenitrificans, however, the positions of heme b595 and d are interchanged, and a common oxygen channel is blocked by a fourth subunit and substituted by a more narrow, alternative channel. Thus, with the same overall fold, the homologous enzymes exhibit a different mechanism. Homologous bd oxidases share the same architecture but differ in mechanism.,Thesseling A, Rasmussen T, Burschel S, Wohlwend D, Kagi J, Muller R, Bottcher B, Friedrich T Nat Commun. 2019 Nov 13;10(1):5138. doi: 10.1038/s41467-019-13122-4. PMID:31723136 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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