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Binding studies were carried out on a vancomycin derivative to examine its
potential bactericidal activity. Of particular interest was the effect of
dimethylation of the amino group at the N-terminus of vancomycin on the
binding ability of the antibiotic to bacterial cell-wall peptide analogues,
namely Ac-D-Ala-D-Ala and Ac2-L-Lys-D-Ala-D-Ala.
Reductive methylation was carried out with sodium cyanoborohydride and
formaldehyde, and the binding constants of the vancomycin derivative with the
peptides were measured by ultraviolet difference spectroscopy.
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