Coordination between chromosome replication, segregation, and cell division in Caulobacter crescentus

Journal of Bacteriology
R B Jensen

Abstract

Progression through the Caulobacter crescentus cell cycle is coupled to a cellular differentiation program. The swarmer cell is replicationally quiescent, and DNA replication initiates at the swarmer-to-stalked cell transition. There is a very short delay between initiation of DNA replication and movement of one of the newly replicated origins to the opposite pole of the cell, indicating the absence of cohesion between the newly replicated origin-proximal parts of the Caulobacter chromosome. The terminus region of the chromosome becomes located at the invaginating septum in predivisional cells, and the completely replicated terminus regions stay associated with each other after chromosome replication is completed, disassociating very late in the cell cycle shortly before the final cell division event. Invagination of the cytoplasmic membrane occurs earlier than separation of the replicated terminus regions and formation of separate nucleoids, which results in trapping of a chromosome on either side of the cell division septum, indicating that there is not a nucleoid exclusion phenotype.

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Citations

Mar 4, 2010·Microbiology and Molecular Biology Reviews : MMBR·Patrick D Curtis, Yves V Brun
Mar 22, 2008·Annual Review of Biochemistry·Dylan M Morris, Grant J Jensen
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Apr 25, 2018·Frontiers in Microbiology·Sue A FloresPamela J B Brown
Oct 12, 2007·Journal of Cell Science·Erin D GoleyLucy Shapiro

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