7qsd | pdb_00007qsd

Bovine complex I in the active state at 3.1 A

spinqualitylabelsall models 7qsd, resolution 3.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7qsd is a 10 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 2MR, 3PE, AME, AYA, CDL, EHZ, FES, FME, FMN, GTP, LMT, MG, NDP, PC1, SAC, SF4, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NU3M_BOVIN 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. Publication Abstract from PubMed The molecular mode of action of biguanides, including the drug metformin, which is widely used in the treatment of diabetes, is incompletely characterized. Here, we define the inhibitory drug-target interaction(s) of a model biguanide with mammalian respiratory complex I by combining cryo-electron microscopy and enzyme kinetics. We interpret these data to explain the selectivity of biguanide binding to different enzyme states. The primary inhibitory site is in an amphipathic region of the quinone-binding channel, and an additional binding site is in a pocket on the intermembrane-space side of the enzyme. An independent local chaotropic interaction, not previously described for any drug, displaces a portion of a key helix in the membrane domain. Our data provide a structural basis for biguanide action and enable the rational design of medicinal biguanides. Structural basis of mammalian respiratory complex I inhibition by medicinal biguanides.,Bridges HR, Blaza JN, Yin Z, Chung I, Pollak MN, Hirst J Science. 2023 Jan 27;379(6630):351-357. doi: 10.1126/science.ade3332. Epub 2023 , Jan 26. PMID:36701435 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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