Incompatibility among group Y plasmids
1981; Elsevier BV; Volume: 6; Issue: 2 Linguagem: Inglês
10.1016/0147-619x(81)90067-6
ISSN1095-9890
Autores Tópico(s)Vibrio bacteria research studies
ResumoIncompatibility expressed by the group Y plasmid prophages P1 and P7 was investigated by analysis of the behavior on nonselective medium of heteroplasmid cells immediately after introduction of the second plasmid by infection. Homologous plasmid pairs (P1-P1 or P7-P7) segregate more rapidly than heterologous (P1–P7) pairs. The determinant of this difference is genetically separable from the immunity determinant of the prophage. Rapid segregation of two homologous plasmids apparently results from the lack of replication of either plasmid and their subsequent separation during cell division. Slower segregation of two heterologous plasmids may be explained by preferential replication of only one of them, followed by the equal distribution of the newly replicated plasmids to daughter cells. Integration of the resident plasmid into the bacterial chromosome does not alter its expression of incompatibility. Incompatibility in group Y seems to involve at least two mechanisms: one is plasmid specific (shown by homologous plasmids) and one is group specific (shown by heterologous plasmids).
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