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Volume 160, Issue 4

The site promotes proper regulation of cell division Free

Abstract

In inhibition of replication leads to a block of cell division. This checkpoint mechanism ensures that no cell divides without having two complete copies of the genome to pass on to the two daughter cells. The chromosomal site is a 1 kb region that contains binding sites for the DnaA replication initiator protein, and which contributes to the inactivation of DnaA. An excess of sites provided on plasmids has been found to lead to both a delay in initiation of replication and in cell division during exponential growth. Here we have investigated the effect of on the cell division block that occurs upon inhibition of replication initiation in a mutant. We found that this checkpoint mechanism was aided by the presence of . In cells where was deleted or an excess of DnaA was provided, cell division occurred in the absence of replication and anucleate cells were formed. This finding indicates that loss of and/or excess of DnaA protein promote cell division. This conclusion was supported by the finding that the lethality of the division-compromised mutants 84 and 23 was suppressed by deletion of , at the lowest non-permissive temperature. We propose that the cell division block that occurs upon inhibition of DNA replication is, at least in part, due to a drop in the concentration of the ATP–DnaA protein.

  • Received:
  • Accepted:
  • Published Online:
Funding
This study was supported by the:
  • Program of Higher-level Talents of Inner Mongolia University ‘SPH-IMU’ (Award grant no. Z20090107)
  • the National Natural Science Foundation of China ‘NSFC’ (Award grant no. 31060015)
  • Norwegian Research Council FUGE program
  • CAMST platform
  • the FRIBIO program
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2014-04-01
2024-04-19
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The Escherichia coli datA site promotes proper regulation of cell division
Microbiology 160, 703 (2014); https://doi.org/10.1099/mic.0.074898-0
/content/journal/micro/10.1099/mic.0.074898-0
/content/journal/micro/10.1099/mic.0.074898-0
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