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. 1990 Mar 25;18(6):1603–1607. doi: 10.1093/nar/18.6.1603

Cleavage at the twelve-base-pair sequence 5'-TCTAGATCTAGA-3' using M.Xbal (TCTAGm6A) methylation and DpnI (Gm6A/TC) cleavage.

Y Patel 1, E Van Cott 1, G G Wilson 1, M McClelland 1
PMCID: PMC330532  PMID: 2158082

Abstract

The DNA methylase M.Xbal was isolated from an E. coli recombinant clone. We deduce that the enzyme methylates at the sequence 5'-TCTAGm6A-3'. In combination with the methylation-dependent restriction endonuclease, DpnI (5'-Gm6A/TC-3'), DNA cleavage occurs at the sequence 5'-TCTAGA/TCTAGA-3'. This twelve-base-pair site should occur once every 16,000,000 base pairs in a random sequence of DNA. The exceptional rarity of the M.XbaI/DpnI sequence makes it an ideal candidate for transpositional integration of a unique cleavage site into bacterial genomes. Retrotransposition into mammalian genomes is also an attractive possibility.

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Selected References

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