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Site-specific methylation: effect on DNA modification methyltransferases and restriction endonucleases.

We present in Table I an updated list of the sensitivities of over 240 restriction endonucleases to the site-specific DNA modifications '14C, n-6C, h1"5C, and m6A, four modifications that are common in DNA prokaryotes, eukaryotes, and their viruses (Mc2,Mc5,Mc8,Mcl 1 ,Ne3,Ne4). Table II is a list of over 130 characterized DNA methyltransferases. A detailed list of cloned restrictionmodification genes has been made Wilson (Wi4). Table m lists the sensitivities of over 20 Type II DNA methyltransferases to m4C, nSC, hm5C, and m6A modification. Most DNA methyltransferases are sensitive to non-canonical modifications within their recognition sequences (Bu5,MclO,Ne3,Po4), and this sensitivity may differ from that of their restriction endonuclease partners. Finally, several restriction endonuclease isoschizomers are known to differ in their ability to cleave DNA which has been methylated. Table IV lists over 20 known isoschizomer pairs and one isomethylator pair, along with the modified recognition sites at which they differ.