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. 1968 Aug;96(2):374–382. doi: 10.1128/jb.96.2.374-382.1968

Reversal of the Vancomycin Inhibition of Peptidoglycan Synthesis by Cell Walls1

Rabindra K Sinha a,2, Francis C Neuhaus a,3
PMCID: PMC252308  PMID: 5674051

Abstract

Addition of cell walls to the peptidoglycan synthetase-acceptor system containing vancomycin (50 μg/ml) prevented the inhibition by the antibiotic. In addition, the inhibition of incorporation of [14C]muramyl-pentapeptide into peptidoglycan in the presence of vancomycin was reversed by the addition of cell walls to the assay mixture at 60 min. Cell walls previously saturated with vancomycin lost their ability to reverse the inhibition by the antibiotic. The inhibition of peptidoglycan synthesis by ristocetin was partially reversed by the addition of cell walls. The initial stage in peptidoglycan synthesis is catalyzed by phospho-N-acetyl(NAc)muramyl-pentapeptide translocase (uridine 5′-phosphate) according to the reaction: UDP-NAc-muramyl-pentapeptide + acceptor ⇄ acceptor-phospho-NAc-muramyl-pentapeptide + UMP where acceptor is C55-isoprenoid alcohol phosphate. Vancomycin stimulates the transfer of phospho-NAc-muramyl-pentapeptide to the acceptor, and the addition of cell walls to this assay mixture prevented the stimulation of transfer. In addition to the transfer reaction, the enzyme catalyzes the exchange of [3H]uridine monophosphate (UMP) with UDP-NAc-muramyl-pentapeptide. The exchange reaction is effectively inhibited by vancomycin. For example, 60 μg of vancomycin per ml inhibited the rate of exchange by 50%. Addition of cell walls restored the exchange of UMP with the UMP moiety of UDP-NAc-muramyl-pentapeptide. Thus, cell walls appeared to have a higher affinity for vancomycin than did either the peptidoglycan synthetase-acceptor system or phospho-NAc-muramyl-pentapeptide translocase. These results provide support for the proposal made by Best and Durham that the effective binding of vancomycin to the cell wall could result in the inhibition of transfer of membrane-associated peptidoglycan chains to the growing wall.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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