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PMID:15716497

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Citation

Sandler, SJ (2005) Requirements for replication restart proteins during constitutive stable DNA replication in Escherichia coli K-12. Genetics 169:1799-806

Abstract

Constitutive stable DNA replication (cSDR) is a mechanism for replisome loading in Escherichia coli K-12. This occurs in a dnaA-independent fashion in an rnhA mutant. cSDR is dependent on recA, priA, and transcription. In this report, it is shown that dnaA rnhA mutants using cSDR for initiation of their DNA replication additionally require priB, but not priC, for viability. Two subtle priA missense mutations either eliminated the ability to grow using cSDR (priA301 C479Y) or resulted in very small colonies (priA300 K230R). DnaC809, a priA suppressor, failed to allow priA or priB mutants to grow using cSDR to initiate DNA replication. Furthermore, unlike dnaC(+) strains, dnaC809 strains require priC for cSDR. DnaC809,820, a priC-independent suppressor of priA2::kan phenotypes, allowed priA and priC (but not priB) mutants to grow using cSDR to initiate DNA replication. It is also shown that rep and rnhA mutations are synthetically lethal. DnaC809 and dnaC809,820 mutations suppress this lethality. Rep is further shown to be required for cSDR in a dnaC809 strain. A model whereby these different sets of replication restart proteins interact preferentially with substrates associated with either RecA or SSB during replication restart and cSDR, respectively, is proposed.

Links

PubMed PMC1449598 Online version:10.1534/genetics.104.036962

Keywords

Bacterial Proteins/chemistry; Bacterial Proteins/metabolism; DNA/chemistry; DNA Replication; DNA, Bacterial; DNA-Binding Proteins/metabolism; Escherichia coli/genetics; Escherichia coli/physiology; Escherichia coli Proteins/chemistry; Gene Expression Regulation, Bacterial; Genome, Bacterial; Macromolecular Substances; Models, Genetic; Mutation; Mutation, Missense; Phenotype; RNA/chemistry; Rec A Recombinases/metabolism; SOS Response (Genetics)

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ECOLI:PRIB

acts_upstream_of_or_within

GO:0006270: DNA replication initiation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ECOLI:PRIB

involved_in

GO:0006270: DNA replication initiation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

See also

References

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