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Genetic mapping of ribosomal protein cistrons ofSalmonella typhimurium andEscherichia coli was performed by phage P1 mediated, generalized transduction. From anE. coli hybrid strain which carried aS. typhimuirum F′ factor, anE. coli strain was constructed which had integratedS. typhimurium genetic material including the region of thestrA locus.Salmonella genetic material from this hybrid was transduced intoE. coli recipients. The ribosomal protein electrophoretic patterns of these hybrid transductants were correlated with the presence of markers contributed by each parent.The results of these studies indicate that cistrons for at least three characteristicS. typhimurium and twoE. coli 30S ribosomal proteins are closely linked to thestrA locus on the genetic maps of both organisms. At least one cistron coding for a 50S ribosomal protein is also closely linked to this locus on both maps. These findings support the concept that cistrons coding for the ribosomal proteins are clustered in one area of the genome. Mutations to spectinomycin and streptomycin resistance are closely linked inS. typhimurium and are located atstrA .

Cotransduction of strA and Ribosomal Protein Cistrons in Escherichia coli-Salmonella typhimurium Hybrids