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. 1987 Jun;169(6):2410–2416. doi: 10.1128/jb.169.6.2410-2416.1987

Modulation of cell wall synthesis by DNA replication in Escherichia coli during initiation of cell growth.

F García-del Portillo, A G Pisabarro, E J de la Rosa, M A de Pedro
PMCID: PMC212078  PMID: 3294790

Abstract

Resting cells of Escherichia coli are able to initiate growth and murein biosynthesis in the presence of beta-lactam antibiotics binding to penicillin-binding proteins (PBPs) 1a and 1b (E. J. de la Rosa, M. A. de Pedro, and D. Vázquez, Proc. Natl. Acad. Sci. USA 82:5632-5635, 1985). Under these conditions, cells elongate normally until they approach the first doubling in mass, the time at which cell lysis starts. Assuming that coupling between DNA replication and cell division both in cells starting growth and in growing cells is essentially similar, triggering of the lytic response in the beta-lactam-treated cells coincides with the termination of the first round of DNA replication. This coincidence suggests that both events are interrelated. We investigated this possibility by studying the initiation of growth in cultures of wild-type strains and in cell division mutants treated with beta-lactams inhibiting PBPs 1a and 1b and with the DNA replication inhibitor nalidixic acid. Addition of nalidixic acid, even late in the first cell cycle, prevented the lytic response of the cells to the blockade of PBPs 1a and 1b. The effect of nalidixic acid is more likely due to its action on DNA replication itself than to its indirect inhibitory effect on cell division or to its ability to induce the SOS system of the cell. These observations favor the idea that the cell wall biosynthetic machinery might be modulated by DNA replication at precise periods during cell growth.

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Selected References

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