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. 1970 Dec;104(3):1052–1064. doi: 10.1128/jb.104.3.1052-1064.1970

Regulation of Cell Division in Escherichia coli: Characterization of Temperature-Sensitive Division Mutants

John N Reeve 1, David J Groves 1, D Joseph Clark 1
PMCID: PMC248261  PMID: 16559077

Abstract

A temperature-sensitive division mutant of Escherichia coli was isolated by using differential filtration to select for filaments at 42 C and normal cells at 30 C. Cells shifted from 30 to 42 C stop dividing almost immediately, suggesting the temperature-sensitive element is required for cell division late in the cell cycle. Cells returned to 30 from 42 C divide abruptly, suggesting accumulation of division potential at 42 C. Inhibitors of protein, deoxyribonucleic acid, and ribonucleic acid synthesis do not block division during the recovery period at 30 C. Cycloserine does not stop cell division, vancomycin shows some effect on cell division, whereas penicillin completely stops cell division during this period. The addition of high concentrations of NaCl to filaments at 42 C results in a burst of cell division. The final cell number is equivalent to the control which is grown at 30 C if sufficient salt is added (11 g/liter, final concentration). After the original burst, cell division ceases at the nonpermissive temperature even at increased osmolality. Chloramphenicol, puromycin, vancomycin, and penicillin prevent division during the recovery in the presence of NaCl. Kinetic data indicate division potential decays to a reversible inactive intermediate which rapidly decays to an irreversible inactive form. Conversion of division potential to the inactive form is correlated with a 100- to 1,000-fold derepression of the synthesis of division potential. The mutation appears to involve a stage in cross-wall synthesis which is required during the terminal stages of division.

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Selected References

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