9w2x

Cryo-EM structure of complex III on the bovine heart submitochondrial particles, III-1

spinqualitylabelsall models 9w2x, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9w2x is a 20 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.2Å Ligands: FES, HEC, HEM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CYB_BOVIN Component of the ubiquinol-cytochrome c reductase complex (complex III or cytochrome b-c1 complex), which is a respiratory chain that generates an electrochemical potential coupled to ATP synthesis. Publication Abstract from PubMed Understanding the functional mechanisms of membrane protein complexes requires structural analysis within their native membrane environment. Here, we applied cryo-electron microscopy to determine the structures of F(o)F(1) ATP synthase and respiratory supercomplexes (SCs) on sub-mitochondrial particles (SMPs) isolated from bovine heart mitochondria. Most F(o)F(1) complexes were observed as dimers stabilized by the regulatory factor IF(1), and a tetrameric assembly comprising two F(o)F(1)-IF(1) dimers arranged linearly was also identified. This finding indicates that the tetrameric units of F(o)F(1) are present in the mitochondrial inner membrane and contribute to shaping cristae tips in mammalian mitochondria. F(o) domain maps resolve the e-subunit- c(8)-ring interface and show no discrete density for a tightly bound lipid within the c(8)-ring. In addition to the previously reported SCs compositions CI(1)CIII(2)CIV(1) and CI(1)CIII(2)CIV(2), our analysis identified an additional assembly with the composition CI(1)CIII(2)CIV(3), as well as a CI(2)CIII(2)CIV(6) mega-complex. This approach enables rapid structural determination of F(o)F(1) ATP synthase and SCs from minimal membrane fractions, providing a foundation for elucidating the molecular basis of metabolic disorders and mitochondrial diseases at the level of higher-order architecture. Structures of respiratory supercomplexes and ATP synthase oligomers in mammalian mitochondrial inner membrane.,Nakano A, Masuya T, Akisada S, Ishikawa-Fukuda M, Mitsuoka K, Miyoshi H, Murai M, Yokoyama K Nat Commun. 2026 Mar 17. doi: 10.1038/s41467-026-70578-x. PMID:41844608 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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