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A Rapid and Efficient Method for Cloning Genes of Type II Restriction-modification Systems by Use of a Killer Plasmid

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Date 2007 May 1
PMID 17468281
Citations 8
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Abstract

We present a method for cloning restriction-modification (R-M) systems that is based on the use of a lethal plasmid (pKILLER). The plasmid carries a functional gene for a restriction endonuclease having the same DNA specificity as the R-M system of interest. The first step is the standard preparation of a representative, plasmid-borne genomic library. Then this library is transformed with the killer plasmid. The only surviving bacteria are those which carry the gene specifying a protective DNA methyltransferase. Conceptually, this in vivo selection approach resembles earlier methods in which a plasmid library was selected in vitro by digestion with a suitable restriction endonuclease, but it is much more efficient than those methods. The new method was successfully used to clone two R-M systems, BstZ1II from Bacillus stearothermophilus 14P and Csp231I from Citrobacter sp. strain RFL231, both isospecific to the prototype HindIII R-M system.

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