Monitoring bacterial resistance to chloramphenicol and other antibiotics by liquid chromatography electrospray ionization tandem mass spectrometry using selected reaction monitoring
Binding of (5<i>S</i>)-Penicilloic Acid to Penicillin Binding Protein 3
作者:Sander S. van Berkel、Joanne E. Nettleship、Ivanhoe K. H. Leung、Jürgen Brem、Hwanho Choi、David I. Stuart、Timothy D. W. Claridge、Michael A. McDonough、Raymond J. Owens、Jingshan Ren、Christopher J. Schofield
DOI:10.1021/cb400200h
日期:2013.10.18
beta-Lactam antibiotics react with penicillin binding proteins (PBPs) to form relatively stable acyl-enzyme complexes. We describe structures derived from the reaction of piperacillin with PBP3 (Pseudomonas aeruginosa) including not only the anticipated acyl-enzyme complex but also an unprecedented complex with (5S)-penicilloic acid, which was formed by C-5 epimerization of the nascent (5R)-penicilloic acid product. Formation of the complex was confirmed by solution studies, including NMR. Together, these results will be useful in the design of new PBP inhibitors and raise the possibility that noncovalent PBP inhibition by penicilloic acids may be of clinical relevance.
Monitoring bacterial resistance to chloramphenicol and other antibiotics by liquid chromatography electrospray ionization tandem mass spectrometry using selected reaction monitoring
作者:Anthony M. Haag、Audrie M. Medina、Ariel E. Royall、Norbert K. Herzog、David W. Niesel