Incompatibility protein IncC and global regulator KorB interact in active partition of promiscuous plasmid RK2.

Abstract:

:Replication of the broad-host-range, IncPalpha plasmid RK2 requires two plasmid loci: trfA, the replication initiator gene, and oriV, the origin of replication. While these determinants are sufficient for replication in a wide variety of bacteria, they do not confer the stable maintenance of parental RK2 observed in its hosts. The product of the incC gene has been proposed to function in the stable maintenance of RK2 because of its relatedness to the ParA family of ATPases, some of which are known to be involved in the active partition of plasmid and chromosomal DNA. Here we show that IncC has the properties expected of a component of an active partition system. The smaller polypeptide product of incC (IncC2) exhibits a strong, replicon-independent incompatibility phenotype with RK2. This incompatibility phenotype requires the global transcriptional repressor, KorB, and the target for incC-mediated incompatibility is a KorB-binding site (O(B)). We found that KorB and IncC interact in vivo by using the yeast two-hybrid system and in vitro by using partially purified proteins. Elevated expression of the incC and korB genes individually has no obvious effect on Escherichia coli cell growth, but their simultaneous overexpression is toxic, indicating a possible interaction of IncC-KorB complexes with a vital host target. A region of RK2 bearing incC, korB, and multiple KorB-binding sites is able to stabilize an unstable, heterologous plasmid in an incC-dependent manner. Finally, elevated levels of IncC2 cause RK2 to aggregate, indicating a possible role for IncC in plasmid pairing. These findings demonstrate that IncC, KorB, and at least one KorB-binding site are components of an active partition system for the promiscuous plasmid RK2.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Rosche TM,Siddique A,Larsen MH,Figurski DH

doi

10.1128/jb.182.21.6014-6026.2000

keywords:

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

6014-26

issue

21

eissn

0021-9193

issn

1098-5530

journal_volume

182

pub_type

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