Plasmids of Yersinia enterocolitica and Yersinia pseudotuberculosis: analysis with restriction endonucleases.

The plasmids of Yersinia enterocolitica and Yersinia pseudotuberculosis tested differed in regard to the following aspect: there were some of a molecular size of 41 to 47 Mdal which could be correlated with autoagglutination of the host bacteria, and the others with a smaller size of 19 to 34 Mdal that lacked the capacity to code for autoagglutination. Analysis of both types of plasmids with the restriction endonucleases Bam HI, Eco RI and Hind III besides of some similarities revealed also considerable serogroup-specific differences in their DNA fragmentation pattern.