The Enzyme Database

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Accepted name: site-specific DNA-methyltransferase (adenine-specific)
Reaction: S-adenosyl-L-methionine + DNA adenine = S-adenosyl-L-homocysteine + DNA 6-methylaminopurine
Other name(s): modification methylase; restriction-modification system
Comments: This is a large group of enzymes, most of which, with enzymes of similar site specificity listed as EC (type 1 site-specific deoxyribonuclease), EC (type II site-specific deoxyribonuclease) or EC (type III site-specific deoxyribonuclease), form so-called ’restriction-modification systems’. A complete listing of all of these enzymes has been produced by R.J. Roberts and is available on-line at
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 69553-52-2
1.  Kessler, C. and Manta, V. Specificity of restriction endonucleases and DNA modification methyltransferases: a review. Gene 92 (1990) 1–248. [PMID: 2172084]
2.  Roberts, R.J. Restriction enzymes and their isoschizomers. Nucleic Acids Res. 18 (1990) 2331–2365. [PMID: 2159140]
3.  Yuan, R. Structure and mechanism of multifunctional restriction endonucleases. Annu. Rev. Biochem. 50 (1981) 285–319. [PMID: 6267988]
[EC created 1984]

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