Molecular and General Genetics MGG

, Volume 186, Issue 1, pp 57–65 | Cite as

Regulation of DNA synthesis and capacity for initiation in DNA temperature sensitive mutants of Escherichia coli

I. Reinitiation and chain elongation
  • Helen Eberle
  • Nancy Forrest
  • Juri Hrynyszyn
  • Janice Van Knapp


The capacity for initiation and subsequent chain elongation was examined in several DNA temperature sensitive mutants of Escherichia coli after the mutants had been held at nonpermissive temperature for approximately 1.5 generation equivalents and then returned to permissive temperature in the presence of chloramphenicol. The results obtained indicate that 4–5 sets of replication forks can be initiated after return to permissive temperature in the presence of chloramphenicol but the forks apparently become stalled and fail to complete chromosomal replication in the presence of chloramphenicol. In temperature reversible dnaA mutants, once the chloramphenicol is removed the forks appear to be able to resume replication at the nonpermissive temperature. The relationship between premature initiation and premature chain termination is discussed.


Escherichia Coli Chloramphenicol Replication Fork Chain Termination dnaA Mutant 
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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Helen Eberle
    • 1
  • Nancy Forrest
    • 1
  • Juri Hrynyszyn
    • 1
  • Janice Van Knapp
    • 1
  1. 1.Department of Radiation Biology and BiophysicsUniversity of Rochester, School of Medicine and DentistryRochesterUSA

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