title: Amber-mutants of plasmid mini-F defective in replication.
abstract: Amber mutants of the mini-F plasmid pML31 were isolated with the mutagen hydroxylamine. Under non-permissive conditions amber mutants segregate and show no incorporation of label into supercoiled plasmid DNA in double-label experiments. Wild-type and one mutant of mini-F were integrated by recombinant DNA techniques into the single EcoRI site of plasmid vector pBR322. Plasmid specific proteins were labeled in minicells and analysed by SDS-PAGE. A 34,000 dalton molecular weight protein was identified to be missing in the amber mutant of plasmid mini-F.
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics; D004261:DNA Replication; D004269:DNA, Bacterial / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000235:genetics; D005144:F Factor; D009154:Mutation; D010641:Phenotype; D010957:Plasmids; D014176:Protein Biosynthesis; D011995:Recombination, Genetic
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial