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

作者：Sun, Yuhui; He, Xinyi; Liang, Jingdan; Zhou, Xiufen; Deng, Zixin^*

来源：Applied Microbiology and Biotechnology, 2009, 82(2): 303-310.

DOI：10.1007/s00253-008-1793-7

• pIJ101
• pHZ1358
• Streptomyces lividans
• Gene replacements

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.

• 出版日期2009-2
• 单位上海交通大学