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Research Article

Virulence-associated plasmids from Yersinia enterocolitica and Yersinia pestis.

D A Portnoy, S Falkow
D A Portnoy
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S Falkow
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ABSTRACT

A 44-megadalton plasmid associated with virulence and Ca2+ dependence from Yersinia enterocolitica 8081 was compared at the molecular level with a 47-megadalton plasmid associated with Ca2+ dependence from Yersinia pestis EV76. The plasmids were found to share 55% deoxyribonucleic acid sequence homology distributed over approximately 80% of the plasmid genomes. One region in which the plasmids differed was found to contain sequences concerned with essential plasmid functions. Forty-five mutants of Y. pestis were isolated which had spontaneously acquired the ability to grow on calcium-free medium (Ca2+ independence). Of these mutants, 21 were cured of their 47-megadalton plasmid, whereas the remaining had either suffered a major deletion of the plasmid or had a 2.2-kilobase insertion located in one of two adjacent BamHI restriction fragments encompassing approximately 9 kilobases. The inserted sequence was found at numerous sites on the Y. pestis chromosome and on all three plasmids in the strain and may represent a Y. pestis insertion sequence element.

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Virulence-associated plasmids from Yersinia enterocolitica and Yersinia pestis.
D A Portnoy, S Falkow
Journal of Bacteriology Dec 1981, 148 (3) 877-883; DOI:

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Virulence-associated plasmids from Yersinia enterocolitica and Yersinia pestis.
D A Portnoy, S Falkow
Journal of Bacteriology Dec 1981, 148 (3) 877-883; DOI:
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