Abstract
The genes for Bacillus subtilis ribosomal proteins S9, S11, and BL27 were mapped using mutants with electrophoretic variants of these proteins isolated for their kasugamycin resistant phenotype. All three genes were in the principal cluster of ribosomal protein genes, and were clockwise to rpsE. BL27 very probably corresponds to Escherichia coli protein L30, so in B. subtilis the positions of the gene for this protein and of that for protein S11 are very similar with respect to the S5 (and S12) genes to the positions in E. coli. In contrast, whereas the S9 gene is in the main cluster in B. subtilis it is elsewhere on the chromosome in E. coli. Taken together with the fact that the genes of the Rif cluster are close to rpsL in B. subtilis, it appears that ribosomal protein genes are less dispersed in this organism than in E. coli. The same has been reported to be the case for the rRNA genes. Mutations in rpsI, the gene for protein S9, can confer a kasugamycin resistant phenotype on the cell.
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