Genetic studies of the ribosomal proteins in Escherichia coli. IX. Mapping of the ribosomal proteins, S2 and S20, by intergeneric mating experiments between Serratia marcescens and Escherichia coli K12.

Episomes of E. coli K12, which cover thrleu region of the chromosome, were transferred to Serratia marcescens. Ribosomal proteins from these hybrid strains were analyzed with phosphocellulose column chromatography. Two E. coli 30S ribosomal proteins, S2 and S20, could be detected in the ribosome of the hybrid strain in addition to all ribosomal proteins of S. marcescens.