Genetic Approaches to Microbial Pathogenicity by R. R. Isberg, S. Falkow (auth.), Professor Dr. W. Goebel

By R. R. Isberg, S. Falkow (auth.), Professor Dr. W. Goebel (eds.)

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Based on this observation, PORTNOY et al. (1983) introduced the transposable element Tn5, which encodes resistance to kanamycin, into the avirulent, plasmid-bearing Y. pestis strain EV76 using Pi:: Tn5. They isolated a series of Ca 2 + -independent Tn5 insertion mutants most of which mapped in the Y. pestis resident plasmid pYV019. They also isolated a few Tn5 insertions within the plasmid which did not affect Ca2+ dependence. The pYV019 plasmids harboring Tn5 (pYV019:: Tn5) were transformed into E.

Pestis virulence plasmid, pYV019, is functionally interchangeable with the virulence plasmid from Y. pseudotuberculosis (TnS insertion 2). This observation is consistent with earlier results which showed that these two plasmids were virtually identical at the molecular level. Also, most TnS insertions within pYV019 which abolished Ca 2 + dependence also abolished the expression of the outer membrane proteins, and virulence (TnS insertions 3-7). It would seem, therefore, that, as described for Y.

Analysis of the secondary structure prediction for the sequenced antigenic variants of MS11 indicates that the general structural parameters identified for the original MS11 serotype are maintained in the additional serotypes, thus supporting the hypothesis that antigenic variability occurs within those regions not important for pilus structural or functional integrity. A comparison of biochemical and biophysical properties for TMV coat protein and gonococcal pilin revealed additional similarities between the two proteins.

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