Construction, transfer and properties of a novel temperature‐sensitive integrable plasmid for genomic analysis ofStaphyiococcus aureus
作者:
J. B. Luchansky,
A. K. Benson,
A. G. Atherly,
期刊:
Molecular Microbiology
(WILEY Available online 1989)
卷期:
Volume 3,
issue 1
页码: 65-78
ISSN:0950-382X
年代: 1989
DOI:10.1111/j.1365-2958.1989.tb00105.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
SummaryAs an alternative approach to genetic transfer and analysis, a novel integrable plasmid system was developed that should prove useful for mapping and cloning various genes inStaphylococcus aureusand other Gram‐positive bacteria. The use of a restriction‐deficient recipient strain and an improved protocol for protoplast plasmid transformation facilitated direct cloning of a recombinant plasmid (pPQ126) inS. aureusNCTC 8325‐4. Plasmid pPQ126 (13.6 kb) is a novel, temperature‐sensitive integrable plasmid containing genes encoding resistance to erythromycin and chloramphenicol (from plasmid pTV1ts), and resistance to gentamicin (from transposon Tn4001). When introduced into an appropriate recipient strain at the permissive temperature (30°C), pPQ126 replicates autonomously. Integration of pPQ126 is directed into homologous chromosomal target sequences (chromosomal insertions of Tn551orTn4001) by growing a population of cells containing autonomous pPQ126 in the presence of gentamicin, erythromycin, and chloramphenicol at 39°C (nonpermissive temperature). Elevated temperature both selects for and maintains pPQ126 as an integrated replicon. Integration of pPQ126 occurs at significantly reduced frequency in a recombination‐deficient host, and does not occur in the absence of host chromosomal homology. Integrated pPQ126 excises from the chromosome under permissive conditions (30°C), and excision results in derivatives of pPQ126 that harbour DNA of chromo
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