ParI, an orphan ParA family protein from Pseudomonas putida KT2440-specific genomic island, interferes with the partition system of IncP-7 plasmids

Masatoshi Miyakoshi, Masaki Shintani, Kei Inoue, Tsuguno Terabayashi, Fumiya Sai, Moriya Ohkuma, Hideaki Nojiri, Yuji Nagata, Masataka Tsuda

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    Pseudomonas putida KT2440 is an ideal soil bacterium for expanding the range of degradable compounds via the recruitment of various catabolic plasmids. In the course of our investigation of the host range of IncP-7 catabolic plasmids pCAR1, pDK1 and pWW53, we found that the IncP-7 miniplasmids composed of replication and partition loci were exceptionally unstable in KT2440, which is the authentic host of the archetypal IncP-9 plasmid pWW0. This study identified ParI, a homologue of ParA family of plasmid partitioning proteins encoded on the KT2440-specific cryptic genomic island, as a negative host factor for the maintenance of IncP-7 plasmids. The miniplasmids were destabilized by ectopic expression of ParI, and the loss rate correlated with the copy number of ParB binding sites in the centromeric parS region. Mutations in the conserved ATPase domains of ParI abolished destabilization of miniplasmids. Furthermore, ParI destabilized miniplasmid derivatives carrying the partition-deficient parA mutations but failed to impact the stability of miniplasmid derivatives with parB mutations in the putative arginine finger. Altogether, these results indicate that ParI interferes with the IncP-7 plasmid partition system. This study extends canonical partition-mediated incompatibility of plasmids beyond heterogeneous mobile genetic elements, namely incompatibility between plasmid and genomic island.

    Original languageEnglish
    Pages (from-to)2946-2959
    Number of pages14
    JournalEnvironmental microbiology
    Volume14
    Issue number11
    DOIs
    Publication statusPublished - 2012 Nov

    ASJC Scopus subject areas

    • Microbiology
    • Ecology, Evolution, Behavior and Systematics

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