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. 1989 Aug;171(8):4217–4221. doi: 10.1128/jb.171.8.4217-4221.1989

Lytic response of Escherichia coli cells to inhibitors of penicillin-binding proteins 1a and 1b as a timed event related to cell division.

F García del Portillo 1, M A de Pedro 1, D Joseleau-Petit 1, R D'Ari 1
PMCID: PMC210193  PMID: 2666392

Abstract

In growing cultures of Escherichia coli, simultaneous inhibition of penicillin-binding proteins 1a and 1b (PBPs 1) by a beta-lactam efficiently induces cell lysis. However, the lytic behavior of cultures initiating growth in the presence of beta-lactams specifically inhibiting PBPs 1 suggested that the triggering of cell lysis was a cell division-related event, at least in the first cell cycle after the resumption of growth (F. Garcia del Portillo, A. G. Pisabarro, E. J. de la Rosa, and M. A. de Pedro, J. Bacteriol. 169:2410-2416, 1987). To investigate whether this apparent correlation would hold true in actively growing cells, we studied the lytic behavior of cultures of E. coli aligned for cell division which were challenged with beta-lactams at different times after alignment. Cell division was aligned either by nutritional shift up or by chromosome replication alignment. Specific inhibition of PBPs 1 with the beta-lactam cefsulodin resulted in a delayed onset of lysis which was coincident in time with the resumption of cell division. The apparent correlation between the initiation of lysis and cell division was abolished when cefsulodin was used in combination with the PBP 2-specific inhibitor mecillinam, leading to the onset of lysis at a constant time after the addition of the beta-lactams. The results presented clearly argue in favor of the hypothesis that the triggering of cell lysis after inhibition of PBPs 1 is a cell division-correlated event dependent on the activity of PBP 2.

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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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