Formation of an F' plasmid by recombination between imperfectly repeated chromosomal Rep sequences: a closer look at an old friend (F'(128) pro lac).
Plasmid F'(128) was formed by an exchange between chromosomal Rep sequences that placed lac near dinB between many pairs of Rep sequences. Plasmid F'(128) is critical for selection-enhanced lac reversion (adaptive mutation), which requires prior lac amplification. The structure of F'(128) supports the idea that amplification is initiated by Rep-Rep recombination and that general mutagenesis requires coamplification of dinB (error-prone polymerase) with lac.
Kofoid
Eric
E
Department of Biology, University of Utah, Salt Lake City 84122, USA.
Bergthorsson
Ulfar
U
Slechta
E Susan
ES
Roth
John R
JR
D000251:Adenosine Triphosphatases / Q000235:genetics*; D001483:Base Sequence; D002876:Chromosomes, Bacterial / Q000235:genetics*; D004265:DNA Helicases / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D005144:F Factor / Q000235:genetics*; D007763:Lac Operon; D008969:Molecular Sequence Data; D009154:Mutation; D011995:Recombination, Genetic; D012091:Repetitive Sequences, Nucleic Acid / Q000235:genetics*
D029968:Escherichia coli Proteins; C506744:rep protein, E coli; D000251:Adenosine Triphosphatases; D004265:DNA Helicases