6kls | pdb_00006kls

Hyperthermophilic respiratory Complex III

spinqualitylabelsall models 6kls, resolution 3.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6kls is a 6 chain structure with sequence from Aquae and Aquifex aeolicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DLX, FES, HEC, HEM, PGV Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Respiratory chain complexes convert energy by coupling electron flow to transmembrane proton translocation. Owing to a lack of atomic structures of cytochrome bc1 complex (Complex III) from thermophilic bacteria, little is known about the adaptations of this macromolecular machine to hyperthermophilic environments. In this study, we purified the cytochrome bc1 complex of Aquifex aeolicus, one of the most extreme thermophilic bacteria known, and determined its structure with and without an inhibitor at 3.3 A resolution. Several residues unique for thermophilic bacteria were detected that provide additional stabilization for the structure. An extra transmembrane helix at the N-terminus of cyt. c1 was found to greatly enhance the interaction between cyt. b and cyt. c1 , and to bind a phospholipid molecule to stabilize the complex in the membrane. These results provide the structural basis for the hyperstability of the cytochrome bc1 complex in an extreme thermal environment. A 3.3 A-Resolution Structure of Hyperthermophilic Respiratory Complex III Reveals the Mechanism of Its Thermal Stability.,Zhu G, Zeng H, Zhang S, Juli J, Pang X, Hoffmann J, Zhang Y, Morgner N, Zhu Y, Peng G, Michel H, Sun F Angew Chem Int Ed Engl. 2020 Jan 2;59(1):343-351. doi: 10.1002/anie.201911554., Epub 2019 Nov 28. PMID:31778296 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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