Ribosomes from erwiniae, pectobacteria, and other were compared by two criteria: (i) disc gel electrophoresis of 50 subunit proteins, and (ii) Ouchterlony gel diffusion of intact ribosomes. There were no significant differences in the electrophoretic protein profiles of strains of , or (synonym: ). The only signficant profile differences occurred with the faster-migrating proteins of enterobacteria grouped according to plant or animal source. Several non-enterobacteria also had similar over-all profiles; however, specific differences were evident. Immuno-diffusion data were effective in establishing relatedness at the subspecies level. A single antigenic determinant was responsible for the specificity and was found to differ in its sensitivity to treatment with trypsin, ribonuclease, or heat.


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