Previous Article | Next Article ![]()
Microbiol. Mol. Biol. Rev., Jun 1997, 212-238, Vol 61, No. 2
T Kogoma
Chromosome replication in Escherichia coli is normally initiated at oriC,
the origin of chromosome replication. E. coli cells possess at least three
additional initiation systems for chromosome replication that are normally
repressed but can be activated under certain specific conditions. These are
termed the stable DNA replication systems. Inducible stable DNA replication
(iSDR), which is activated by SOS induction, is proposed to be initiated
from a D-loop, an early intermediate in homologous recombination. Thus,
iSDR is a form of recombination-dependent DNA replication (RDR). Analysis
of iSDR and RDR has led to the proposal that homologous recombination and
double-strand break repair involve extensive semiconservative DNA
replication. RDR is proposed to play crucial roles in homologous
recombination, double- strand break repair, restoration of collapsed
replication forks, and adaptive mutation. Constitutive stable DNA
replication (cSDR) is activated in mhA mutants deficient in RNase HI or in
recG mutants deficient in RecG helicase. cSDR is proposed to be initiated
from an R- loop that can be formed by the invasion of duplex DNA by an RNA
transcript, which most probably is catalyzed by RecA protein. The third
form of SDR is nSDR, which can be transiently activated in wild-type cells
when rapidly growing cells enter the stationary phase. This article
describes the characteristics of these alternative DNA replication forms
and reviews evidence that has led to the formulation of the proposed models
for SDR initiation mechanisms. The possible interplay between DNA
replication, homologous recombination, DNA repair, and transcription is
explored.
Copyright © 1997, American Society for Microbiology
Stable DNA replication: interplay between DNA replication, homologous recombination, and transcription
Department of Cell Biology, University of New Mexico Health Sciences Center, Albuquerque 87131, USA. kogoma@medusa.unm.edu
This article has been cited by other articles:
| Appl. Environ. Microbiol. | Infect. Immun. | Eukaryot. Cell |
|---|---|---|
| Mol. Cell. Biol. | J. Virol. | J. Bacteriol. |
| ALL ASM JOURNALS |