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- W2013309871 abstract "Antimycin and cyazofamid are specific inhibitors of the mitochondrial respiratory chain and bind to the Q i site of the cytochrome bc 1 complex. With the aim to understand the detailed molecular inhibition mechanism of Q i inhibitors, we performed a comparative investigation of the inhibitory kinetics of them against the porcine bc 1 complex. The results showed that antimycin is a slow tight‐binding inhibitor of succinate–cytochrome c reductase (SCR) with K i = 0.033 ± 0.00027 n m and non‐competitive inhibition with respect to cytochrome c . Cyazofamid is a classical inhibitor of SCR with K i = 12.90 ± 0.91 μ m and a non‐competitive inhibitor with respect to cytochrome c . Both of them show competitive inhibition with respect to substrate DBH 2 . Further molecular docking and quantum mechanics calculations were performed. The results showed that antimycin underwent significant conformational change upon the binding. The energy barrier between the conformations in the crystal and in the binding pocket is ~13.63 kcal/mol. Antimycin formed an H‐bond with Asp228 and two water‐bridged H ‐bonds with L ys227 and H is201, whereas cyazofamid formed only one H ‐bond with A sp228. The conformational change and the different hydrogen bonding network might account for why antimycin is a slow tight‐binding inhibitor, whereas cyazofamid is a classic inhibitor." @default.
- W2013309871 created "2016-06-24" @default.
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- W2013309871 date "2013-09-19" @default.
- W2013309871 modified "2023-10-18" @default.
- W2013309871 title "Comparative Kinetics of<i>Q</i><sub>i</sub>Site Inhibitors of Cytochrome<i>bc</i><sub>1</sub>Complex: Picomolar Antimycin and Micromolar Cyazofamid" @default.
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- W2013309871 doi "https://doi.org/10.1111/cbdd.12199" @default.
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