Homology in the Transfer Origins of Broad Host Range IncP Plasmids: Definition of Two Subgroups of P Plasmids

Overview

Journal Mol Gen Genet

Specialties Genetics
Molecular Biology

Date 1983 Jan 1

PMID 6581376

Citations 18

Authors

E Yakobson

G Guiney

Affiliations

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Abstract

The transfer systems of broad host range IncP plasmids are increasingly used in the genetic analysis and manipulation of many gram-negative bacteria. We have examined the structural and functional relatedness of the transfer origins of ten different broad host range plasmids which belong to the IncP incompatibility group. The data reported here, together with our results on relatedness of the replication segments of these plasmids, demonstrate that the genomes of all IncP plasmids share extensive sequence homology in the regions specifying the transfer origin and replication functions. The homology results reveal the existence of two subclasses among IncP plasmids, designated here as IncP alpha and IncP beta. Furthermore, a functional analysis of the transfer origins of IncP plasmids suggests strongly that the DNA-nicking relaxation complex (Guiney and Helinski 1979) is required for plasmid transfer during conjugation.

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Complete Nucleotide Sequence of IncP-1β Plasmid pDTC28 Reveals a Non-Functional Variant of the blaGES-Type Gene.

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Host range diversification within the IncP-1 plasmid group.

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