7ak5

Cryo-EM structure of respiratory complex I in the deactive state from Mus musculus at 3.2 A

spinqualitylabelsall models 7ak5, resolution 3.17Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7ak5 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 3.17Å Ligands: 2MR, 3PE, ATP, AYA, CDL, EHZ, FES, FME, FMN, NDP, PC1, SAC, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NU2M_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 (By similarity). Publication Abstract from PubMed Mitochondrial complex I is central to the pathological reactive oxygen species (ROS) production that underlies cardiac ischemia-reperfusion (IR) injury. ND6-P25L mice are homoplasmic for a disease-causing mtDNA point mutation encoding the P25L substitution in the ND6 subunit of complex I. The cryo-EM structure of ND6-P25L complex I revealed subtle structural changes that facilitate rapid conversion to the "deactive" state, usually formed only after prolonged inactivity. Despite its tendency to adopt the "deactive" state, the mutant complex is fully active for NADH oxidation, but cannot generate ROS by reverse electron transfer (RET). ND6-P25L mitochondria function normally, except for their lack of RET ROS production, and ND6-P25L mice are protected against cardiac IR injury in vivo. Thus, this single point mutation in complex I, which does not affect oxidative phosphorylation but renders the complex unable to catalyse RET, demonstrates the pathological role of ROS production by RET during IR injury. Structural basis for a complex I mutation that blocks pathological ROS production.,Yin Z, Burger N, Kula-Alwar D, Aksentijevic D, Bridges HR, Prag HA, Grba DN, Viscomi C, James AM, Mottahedin A, Krieg T, Murphy MP, Hirst J Nat Commun. 2021 Jan 29;12(1):707. doi: 10.1038/s41467-021-20942-w. PMID:33514727 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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