Region-specific insertion of transposons in combination with selection for high plasmid transferability and stability accounts for the structural similarity of IncP-1 plasmids

Masahiro Sota, Masataka Tsuda, Hirokazu Yano, Haruo Suzuki, Larry J. Forney, Eva M. Top

研究成果: Article

30 被引用数 (Scopus)

抄録

The overall architecture of IncP-1 plasmids is very conserved in that the accessory genes are typically located in one or two specific regions: between oriV and trfA and between the tra and trb operons. Various hypotheses have been formulated to explain this, but none have been tested experimentally. We investigated whether this structural similarity is due to region-specific transposition alone or also is reliant on selection for plasmids with insertions limited to these two regions. We first examined the transposition of Tn21Km into IncP-1β plasmid pBP136 and found that most Tn21Km insertions (67%) were located around oriV. A similar experiment using the oriV region of IncP-1β plasmid pUO1 confirmed these results. We then tested the transferability, stability, and fitness cost of different pBP136 derivatives to determine if impairment of these key plasmid characters explained the conserved plasmid architecture. Most of the pBP136 derivatives with insertions in transfer genes were no longer transferable. The plasmids with insertions in the oriV-trfA and tra-trb regions were more stable than other plasmid variants, and one of these also showed a significantly lower fitness cost. In addition, our detailed sequence analysis of IncP-1 plasmids showed that Tn402/5053-like transposons are situated predominantly between the tra and trb operons and close to the putative resolution site for the ParA resolvase, a potential hot spot for those transposons. Our study presents the first empirical evidence that region-specific insertion of transposons in combination with selection for transferable and stable plasmids explains the structural similarity of IncP-1 plasmids.

本文言語English
ページ(範囲)3091-3098
ページ数8
ジャーナルJournal of Bacteriology
189
8
DOI
出版ステータスPublished - 2007 4

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

フィンガープリント 「Region-specific insertion of transposons in combination with selection for high plasmid transferability and stability accounts for the structural similarity of IncP-1 plasmids」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル