title: Polarity of amber mutations in ribosomal protein genes of Escherichia coli.
abstract: Two amber mutations have been mapped inside the spcA-strA region (now called rpsE-rpsL) on the bacterial genome. Derivatives of the transducing phage lambda fus3 carrying each mutation were constructed and assayed in ultraviolet-irradiated bacteria to identify the mutated genes and measure the polarity of the mutations. The data indicated that both mutations, 3162(Am) and 3161(Am), affect genes coding for ribosomal proteins: rplC (L3) and rpsN (S14), respectively. It was shown also that each mutation exerts, inside of its respective operon (S10 and spc units), a relatively strong polar effect on genes distal to the mutated locus.
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics*; D002874:Chromosome Mapping; D002876:Chromosomes, Bacterial; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D005796:Genes; D005816:Genetic Complementation Test; D009154:Mutation; D009876:Operon; D000091243:Ribosomal Protein S9; D012269:Ribosomal Proteins / Q000235:genetics*; D014161:Transduction, Genetic
chemical_list: D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D000091243:Ribosomal Protein S9; D012269:Ribosomal Proteins; C000717190:RpsI protein, E coli