8rgp | pdb_00008rgp

Closed Complex I from murine brain

spinqualitylabelsall models 8rgp, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8rgp is a 10 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3Å Ligands: 2MR, 3PE, AYA, CDL, DGT, FES, FME, FMN, K, MG, NDP, PC1, SAC, SF4, UQ, ZMP, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NDUS7_MOUSE Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone.[UniProtKB:O75251] Publication Abstract from PubMed Supercomplexes of the respiratory chain are established constituents of the oxidative phosphorylation system, but their role in mammalian metabolism has been hotly debated. Although recent studies have shown that different tissues/organs are equipped with specific sets of supercomplexes, depending on their metabolic needs, the notion that supercomplexes have a role in the regulation of metabolism has been challenged. However, irrespective of the mechanistic conclusions, the composition of various high molecular weight supercomplexes remains uncertain. Here, using cryogenic electron microscopy, we demonstrate that mammalian (mouse) tissues contain three defined types of 'respirasome', supercomplexes made of CI, CIII(2) and CIV. The stoichiometry and position of CIV differs in the three respirasomes, of which only one contains the supercomplex-associated factor SCAF1, whose involvement in respirasome formation has long been contended. Our structures confirm that the 'canonical' respirasome (the C-respirasome, CICIII(2)CIV) does not contain SCAF1, which is instead associated to a different respirasome (the CS-respirasome), containing a second copy of CIV. We also identify an alternative respirasome (A-respirasome), with CIV bound to the 'back' of CI, instead of the 'toe'. This structural characterization of mouse mitochondrial supercomplexes allows us to hypothesize a mechanistic basis for their specific role in different metabolic conditions. SCAF1 drives the compositional diversity of mammalian respirasomes.,Vercellino I, Sazanov LA Nat Struct Mol Biol. 2024 Jul;31(7):1061-1071. doi: 10.1038/s41594-024-01255-0. , Epub 2024 Apr 4. PMID:38575788 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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