Applied Microbiology and Biotechnology

, Volume 82, Issue 2, pp 303–310

Analysis of functions in plasmid pHZ1358 influencing its genetic and structural stability in Streptomyces lividans 1326

  • Yuhui Sun
  • Xinyi He
  • Jingdan Liang
  • Xiufen Zhou
  • Zixin Deng
Applied Genetics and Molecular Biotechnology

Abstract

The complete DNA sequence of plasmid pHZ1358, a widely used vector for targeted gene disruption and replacement experiments in many Streptomyces hosts, has been determined. This has allowed a detailed analysis of the basis of its structural and segregational instability, compared to the high copy number plasmid pIJ101 of Streptomyces lividans 1326 from which it was derived. A 574-bp DNA region containing sti (strong incompatibility locus) was found to be a determinant for segregational instability in its original S. lividans 1326 host, while the structural instability was found to be related to the facile deletion of the entire Escherichia coli-derived part of pHZ1358, mediated by recombination between 36-bp direct repeats. A point mutation removing the BamHI site inside the rep gene encoding a replication protein (rep*) and/or a spontaneous deletion of the 694-bp region located between rep and sti including the uncharacterized ORF85 (orf85) produced little or no effect on stability. A pHZ1358 derivative (pJTU412, sti, rep*, orf85) was then constructed which additionally lacked one of the 36-bp direct repeats. pJTU412 was demonstrated to be structurally stable but segregationally unstable and, in contrast to sti+ pHZ1358, allowed efficient targeted gene replacement in S. lividans 1326.

Keywords

pIJ101 pHZ1358 Streptomyces lividans Gene replacements 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Yuhui Sun
    • 1
    • 2
  • Xinyi He
    • 1
  • Jingdan Liang
    • 1
  • Xiufen Zhou
    • 1
  • Zixin Deng
    • 1
  1. 1.Laboratory of Microbial Metabolism and School of Life Science and BiotechnologyShanghai Jiaotong UniversityShanghaiChina
  2. 2.Department of BiochemistryUniversity of CambridgeCambridgeUK

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