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. 1991 Feb 25;19(4):829–832. doi: 10.1093/nar/19.4.829

Enzymatic cleavage of a bacterial chromosome at a transposon-inserted rare site.

J Hanish 1, M McClelland 1
PMCID: PMC333718  PMID: 1850125

Abstract

The sequential use of the methylase M.Xbal (5'.TCTAGm6A) and the methylation-dependent endonuclease Dpnl (5'-Gm6A decreases TC) results in cleavage at 5'.TCTAGA decreases TCTAGA. This recognition sequence was introduced into a transposon derived from the Mu bacteriophage and transposed into the genome of the bacterium Salmonella typhimurium. M.Xbal methylation was provided in vivo by a plasmid containing the M.Xbal gene and the S. typhimurium genome was cleaved to completion by Dpnl at one or more sites, depending on the number of transposon insertions. The resulting genomic fragments were resolved by pulsed-field electrophoresis. The potential use of single M.Xbal/Dpnl cleavage sites as reference positions to map rare restriction sites is discussed.

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Selected References

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