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The Effect of Environment on the Recognition and Binding of Vancomycin to Native and Resistant Forms of Lipid II

Overview
Journal Biophys J
Publisher Cell Press
Specialty Biophysics
Date 2012 Jan 21
PMID 22261057
Citations 13
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Abstract

Molecular dynamics simulations and free energy calculations have been used to examine in detail the mechanism by which a receptor molecule (the glycopeptide antibiotic vancomycin) recognizes and binds to a target molecule (lipid II) embedded within a membrane environment. The simulations show that the direct interaction of vancomycin with lipid II, as opposed to initial binding to the membrane, leads most readily to the formation of a stable complex. The recognition of lipid II by vancomycin occurred via the N-terminal amine group of vancomycin and the C-terminal carboxyl group of lipid II. Despite lying at the membrane-water interface, the interaction of vancomycin with lipid II was found to be essentially identical to that of soluble tripeptide analogs of lipid II (Ac-d-Ala-d-Ala; root mean-square deviation 0.11 nm). Free energy calculations also suggest that the relative binding affinity of vancomycin for native, resistant, and synthetic forms of membrane-bound lipid II was unaffected by the membrane environment. The effect of the dimerization of vancomycin on the binding of lipid II, the position of lipid II within a biological membrane, and the effect of the isoamylene tail of lipid II on membrane fluidity have also been examined.

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