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- W2093212356 abstract "Ramoplanin is a lipglycodepsipeptide antibiotic that inhibits peptidoglycan biosynthesis. Its mechanism of action has been the subject of debate. It was originally proposed to inhibit the MurG step of peptidoglycan synthesis by binding Lipid I. In this paper, we report that ramoplanin inhibits bacterial transglycosylases by binding to Lipid II, the substrate for these enzymes. The inhibition curves reveal that the inhibitory species has a stoichiometry of 2:1 ramoplanin:Lipid II. A Job titration confirms that ramoplanin binds as a dimer to Lipid II. The apparent dissociation constant is in the nanomolar range, which is unusually low given the nature of the interacting species. We show that Lipid II binding is coupled to the formation of a higher order species, which may explain the tight binding. We also present a testable model for the binding-competent dimeric conformation of ramoplanin." @default.
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- W2093212356 date "2003-06-28" @default.
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- W2093212356 title "Ramoplanin Inhibits Bacterial Transglycosylases by Binding as a Dimer to Lipid II" @default.
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- W2093212356 doi "https://doi.org/10.1021/ja035217i" @default.
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