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Journal Article| Volume 255, ISSUE 9, P3977-3986, May 10, 1980

The mechanism of action of penicillin. Penicillin acylates the active site of Bacillus stearothermophilus D-alanine carboxypeptidase.

Open AccessPublished:May 10, 1980DOI:https://doi.org/10.1016/S0021-9258(19)85621-1
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      Penicillin kills susceptible bacteria by specifically inhibiting the transpeptidase that catalyzes the final step in cell wall biosynthesis, the cross-linking of peptidoglycan. It was hypothesized (Tipper, D., and Strominger, J. (1965) Proc. Natl. Acad. Sci. U.S.A. 54, 1133-1141) that 1) penicillin is a structural analog of the acyl-D-alanyl-D-alanine terminus of the pentapeptide side chains of nascent peptidoglycan, and that 2) penicillin, by virtue of its highly reactive beta-lactam structure, irreversibly acylates the active site of the cell wall transpeptidase. Although the cell wall transpeptidase has proven elusive, a closely related penicillin-sensitive cell wall enzyme, D-alanine carboxypeptidase, has been purified from membranes of Bacillus stearothermophilus by penicillin affinity chromatography. By amino acid sequence analysis of 14C-labeled cyanogen bromide peptides generated and purified from this carboxypeptidase covalently labeled with either [14C]penicillin G or the substrate, [14C]diacetyl-L-lysyl-D-alanyl-D-lactate, it was shown that the penicillin and substrate were both bound as esters to a serine at residue 36. Therefore, the second hypothesis stated above was proven to be correct for D-alanine carboxypeptidase. Several new methods were developed in the course of this work, including 1) a rapid penicillin-binding assay, 2) use of hydroxylamine to protect peptides against carbamylation during ion exchange chromatography in concentrated urea solutions, and 3) gel filtration chromatography in 70% formic acid, a universal solvent for peptides.

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