8esz | pdb_00008esz

Structure of mitochondrial complex I from Drosophila melanogaster, Helix-locked state

spinqualitylabelsall models 8esz, resolution 3.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8esz is a 10 chain structure with sequence from Drosophila melanogaster. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.4Å Ligands: 3PE, C14, CDL, D12, DGT, FES, FMN, NDP, OCT, PC1, U10, WSF, ZMP, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9VQD7_DROME Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in 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.[ARBA:ARBA00003195][RuleBase:RU363103] Publication Abstract from PubMed Respiratory complex I is a proton-pumping oxidoreductase key to bioenergetic metabolism. Biochemical studies have found a divide in the behavior of complex I in metazoans that aligns with the evolutionary split between Protostomia and Deuterostomia. Complex I from Deuterostomia including mammals can adopt a biochemically defined off-pathway 'deactive' state, whereas complex I from Protostomia cannot. The presence of off-pathway states complicates the interpretation of structural results and has led to considerable mechanistic debate. Here, we report the structure of mitochondrial complex I from the thoracic muscles of the model protostome Drosophila melanogaster. We show that although D. melanogaster complex I (Dm-CI) does not have a NEM-sensitive deactive state, it does show slow activation kinetics indicative of an off-pathway resting state. The resting-state structure of Dm-CI from the thoracic muscle reveals multiple conformations. We identify a helix-locked state in which an N-terminal alpha-helix on the NDUFS4 subunit wedges between the peripheral and membrane arms. Comparison of the Dm-CI structure and conformational states to those observed in bacteria, yeast, and mammals provides insight into the roles of subunits across organisms, explains why the Dm-CI off-pathway resting state is NEM insensitive, and raises questions regarding current mechanistic models of complex I turnover. Resting mitochondrial complex I from Drosophila melanogaster adopts a helix-locked state.,Padavannil A, Murari A, Rhooms SK, Owusu-Ansah E, Letts JA Elife. 2023 Mar 23;12:e84415. doi: 10.7554/eLife.84415. PMID:36952377 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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