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. 1986 Jan;165(1):66–71. doi: 10.1128/jb.165.1.66-71.1986

SOS-independent coupling between DNA replication and cell division in Escherichia coli.

A Jaffé, R D'Ari, V Norris
PMCID: PMC214371  PMID: 3001034

Abstract

Inhibition of DNA synthesis in Escherichia coli mutants in which the SOS-dependent division inhibitors SfiA and SfiC were unable to operate led to a partial arrest of cell division. This SOS-independent mechanism coupling DNA replication and cell division was characterized with respect to residual division, particle number, and DNA content. Whether DNA replication was blocked in the initiation or the elongation step, numerous normal-sized anucleate cells were produced (not minicells or filaments). Their production was used to evaluate the efficiency of this coupling mechanism, which seems to involve the cell division protein FtsZ (SulB), also known to be the target of the division inhibitors SfiA and SfiC. In the absence of DNA synthesis, the efficiency of coupling was modulated by the cyclic-AMP-cyclic-AMP receptor protein complex, which was required for anucleate cell production.

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Selected References

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