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. 1983 May;154(2):693–701. doi: 10.1128/jb.154.2.693-701.1983

Site-directed mutagenesis in Escherichia coli of a stable R772::Ti cointegrate plasmid from Agrobacterium tumefaciens.

J Hille, J van Kan, I Klasen, R Schilperoort
PMCID: PMC217518  PMID: 6302080

Abstract

The host range of an octopine Ti plasmid is limited to Rhizobiaceae. This has been extended also to Escherichia coli in the form of a stable cointegrate with the wide-host-range plasmid R772. Its structure was studied by constructing a physical map of R772 and of the R772::pTiB6 cointegrate. An insertion sequence present in R772, called IS70, turned out to be involved in cointegrate formation. We found one intact copy of IS70 and a small segment of IS70, respectively, at the junctions of R772 and Ti DNA. The absence of a complete second copy of IS70 is a likely explanation for the stability of the cointegrate plasmid. A procedure for site-directed mutagenesis of this cointegrate plasmid in E. coli is described. The effect of mutations in the Ti plasmid part can be studied subsequently by transferring the cointegrate into Agrobacterium tumefaciens. The advantage of this procedure for Ti plasmids over other methods used at present is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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