Genetic studies of the ribosomal proteins in Escherichia coli. 7. Mapping of several ribosomal protein components by transduction experiments between different strains of Escherichia coli

Summary Two 50s (50-10 and 50-12) and two 30s (30-4 and 30-7) ribosomal proteins could be distinguished between Shigella dysenteriae Sh/s and Escherichia coli K-12 JC411 with CMC column chromatography. On the other hand, E. coli K-12 AT2472 was shown to have a 30s ribosomal protein, 30-6(AT), which is specific to this strain and distinguishable from 30-6 of other E. coli K-12 strains. Transduction experiments by phage Plkc between Sh. dysenteriae Sh/s and E. coli ATSPCO1, a spectinomycin resistant mutant derived from AT2472 in which the 30-4 protein is altered, indicated that the genes specifying the above five ribosomal protein components are located in the streptomycin region on the E. coli chromosome.The gene order for three 50s (50-8, 50-10 and 50-12) and three 30s str (30-?), 30-4 and 30-6] ribosomal proteins on the chromosome was determined by transduction technique between Sh. dysenteriae Sh/s and E. coli ATSPC01, between E. coli ATSPC01 and E. coli ER05 (an erythromycin resistant strain in which the 50-8 protein is altered), and between Sh. dysenteriae Sh/s and E. coli ERSPC14 (str ^s spc ^r ery ^r), respectively. It was found that these protein genes are arranged on the chromosome in the order of str (30-?)-30-4-30-6-50-8-50-10-50-12.