The cytoplasmic peptidoglycan precursor of vancomycin-resistant Enterococcus faecalis terminates in lactate.
AUTOR(ES)
Handwerger, S
RESUMO
Vancomycin resistance plasmids in enterococci carry the genes vanH and vanA, which encode enzymes catalyzing, respectively, the reduction of 2-keto acids to 2-D-hydroxy acids and the addition of D-hydroxy acids to D-alanine. It has therefore been postulated that resistant cells produce peptidoglycan precursors that terminate in the depsipeptide D-alanine-2-D-hydroxy acid rather than the dipeptide D-alanine-D-alanine, thus preventing vancomycin binding (M. Arthur, C. Molinas, T. D. H. Bugg, G. D. Wright, C. T. Walsh, and P. Courvalin, Antimicrob. Agents Chemother. 36:867-869, 1992). In the present work, a cytoplasmic peptidoglycan precursor was isolated from vancomycin-resistant Enterococcus faecalis and analyzed by mass spectrometry, which suggested the structure UDP-N-acetyl-muramyl-L-Ala-D-Glu-L-Lys-D-Ala-D-lactate.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=207137Documentos Relacionados
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