The Enzyme Database

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EC 2.1.1.113     
Accepted name: site-specific DNA-methyltransferase (cytosine-N4-specific)
Reaction: S-adenosyl-L-methionine + DNA cytosine = S-adenosyl-L-homocysteine + DNA N4-methylcytosine
Other name(s): modification methylase; restriction-modification system; DNA[cytosine-N4]methyltransferase; m4C-forming MTase; S-adenosyl-L-methionine:DNA-cytosine 4-N-methyltransferase
Systematic name: S-adenosyl-L-methionine:DNA-cytosine N4-methyltransferase
Comments: This is a large group of enzymes, most of which, with enzymes of similar site specificity listed as EC 3.1.21.3 (type 1 site-specific deoxyribonuclease), EC 3.1.21.4 (type II site-specific deoxyribonuclease) or EC 3.1.21.5 (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 http://rebase.neb.com/rebase/rebase.html.
Links to other databases: BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB, CAS registry number: 169592-50-1
References:
1.  Kessler, C. and Manta, V. Specificity of restriction endonucleases and DNA modification methyltransferases: a review. Gene 92 (1990) 1–248. [DOI] [PMID: 2172084]
2.  Klimasauskas, S., Timinskas, A., Menkevicius, S., Butkiene, D., Butkus, V. and Janulaitis, A. Sequence motifs characteristic of DNA[cytosine-N4]methyltransferases: similarity to adenine and cytosine-C5 DNA-methylases. Nucleic Acids Res. 17 (1989) 9823–9832. [DOI] [PMID: 2690010]
3.  Roberts, R.J. Restriction enzymes and their isoschizomers. Nucleic Acids Res. 18 (1990) 2331–2365. [PMID: 2159140]
4.  Yuan, R. Structure and mechanism of multifunctional restriction endonucleases. Annu. Rev. Biochem. 50 (1981) 285–319. [DOI] [PMID: 6267988]
[EC 2.1.1.113 created 1992]
 
 


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