Abstract
The mechanism of the action of piperacillin against Escherichia coli was investigated. This drug converted cells to filaments, but did not show lytic action in a range of concentrations below 25 mug/ml. In some of the filaments, stretched constrictions with various diameters were observed. Addition of piperacillin to a synchronous culture inhibited cell division immediately at any stage of the cell cycle. The results of morphological examination of synchronous cultures show that the percentage of filaments with a stretched constriction corresponds to that of normally septated cells before addition of the drug. Furthermore, peptidoglycan synthesis and cross-linking were not inhibited by this drug. It is likely that this drug inhibits only septum formation, but not the growth of wall, and that stretched constrictions are a result of longitudinal growth of septation caused by the drug. Examination of affinity of the drug to penicillin-binding proteins shows that protein 3 is the most sensitive, proteins 2 and 7 are moderately so, and protein 1 is sensitive only to high concentrations of the drug.
MeSH Terms
Bacterial Proteins/metabolism
Carrier Proteins/metabolism
Cell Division/drug effects
Cell Wall/drug effects,metabolism
Escherichia coli/cytology,drug effects,metabolism
Microscopy, Electron, Scanning
Penicillins/metabolism,pharmacology
Peptidoglycan
Peptidyl Transferases/metabolism
Chemicals
Bacterial Proteins
Carrier Proteins
Penicillins
Peptidoglycan
Peptidyl Transferases
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Iida K
Hirata S
Nakamuta S
Koike M
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