Instability of Inhibited Replication Forks in E. Coli

Bioessays. 1995 Aug;17(8):733-41. doi: 10.1002/bies.950170810.

Abstract

Inhibiting the progress of replication forks in E. coli makes them susceptible to breakage. Broken replication forks are evidently reassembled by the RecBCD recombinational repair pathway. These findings explain a particular pattern of DNA degradation during inhibition of chromosomal replication, the role of recombination in the viability of mutants with displaced replication origin, and hyper-recombination observed in the Terminus of the E. coli chromosome in rnh mutants. Breakage and repair of inhibited replication forks could be the reason for the recombination-dependence of inducible stable DNA replication. A mechanism by which RecABCD-dependent recombination between very short inverted repeats may help E. coli to invert an operon, transcribed in the direction opposite to that of DNA replication, is discussed.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Review

MeSH terms

  • DNA Replication*
  • DNA, Bacterial / genetics
  • Escherichia coli / genetics*

Substances

  • DNA, Bacterial