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• W1486108327 endingPage "7841" @default.
• W1486108327 startingPage "7834" @default.
• W1486108327 abstract "RepA, a plasmid-encoded gene product required for pSC101 replication in Escherichia coli, is shown here to inhibit the replication of pSC101 in vivo when overproduced 4- to 20-fold in trans. Unlike plasmids whose replication is prevented by mutations in the repA gene, plasmids prevented from replicating by overproduction of the RepA protein were lost rapidly from the cell population instead of being partitioned evenly between daughter cells. Removal of the partition (par) locus increased the inhibitory effect of excess RepA on replication, while host and plasmid mutations that compensate for the absence of par, or overproduction of the E. coli DnaA protein, diminished it. A repA mutation (repA46) that elevates pSC101 copy number almost entirely eliminated the inhibitory effect of RepA at high concentration and stimulated replication when the protein was moderately overproduced. As the RepA protein can exist in both monomer and dimer forms, we suggest that overproduction promotes RepA dimerization, reducing the formation of replication initiation complexes that require the RepA monomer and DnaA; we propose that the repA46 mutation alters the ability of the mutant protein to dimerize. Our discovery that an elevated intracellular concentration of RepA specifically impedes plasmid partitioning implies that the RepA-containing complexes initiating pSC101 DNA replication participate also in the distribution of plasmids at cell division." @default.
• W1486108327 created "2016-06-24" @default.
• W1486108327 creator A5037623968 @default.
• W1486108327 creator A5047092331 @default.
• W1486108327 date "1993-12-01" @default.
• W1486108327 modified "2023-09-23" @default.
• W1486108327 title "Excess intracellular concentration of the pSC101 RepA protein interferes with both plasmid DNA replication and partitioning" @default.
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• W1486108327 doi "https://doi.org/10.1128/jb.175.24.7834-7841.1993" @default.
• W1486108327 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/206959" @default.
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