Enzyme-mediated cytosine deamination by the bacterial methyltransferase M.MspI

Jean Marc Zingg, Jiang Cheng Shen, Peter A. Jones

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Most prokaryotic (cytosine-5)-DNA methyltransferases increase the frequency of deamination at the cytosine targeted for methylation in vitro in the absence of the cofactor S-adenosylmethionine (AdoMet) or the reaction product S-adenosylhomocysteine (AdoHcy). We show here that, under the same in vitro conditions, the prokaryotic methyltransferase, M.MspI (from Moraxella sp.), causes very few cytosine deaminations, suggesting a mechanism in which M.MspI may avoid enzyme-mediated cytosine deamination. Two analogues of AdoMet, sinefungin and 5'-amino-5'-deoxyadenosine, greatly increased the frequency of cytosine deamination mediated by M.MspI presumably by introducing a proton-donating amino group into the catalytic centre, thus facilitating the formation of an unstable enzyme-dihydrocytosine intermediate and hydrolytic deamination. Interestingly, two naturally occurring analogues, adenosine and 5'-methylthio-5'-deoxyadenosine, which do not contain a proton-donating amino group, also weakly increased the deamination frequency by M.MspI, even in the presence of AdoMet or AdoHcy. These analogues may trigger a conformational change in the enzyme without completely inhibiting the access of solvent water to the catalytic centre, thus allowing hydrolytic deamination of the enzyme-dihydrocytosine intermediate. Under normal physiological conditions the enzymes M.HpaII (from Haemophilus parainfluenzae), M.HhaI (from Haemophilus hemolytica) and M.MspI all increased the in vivo deamination frequency at the target cytosines with comparable efficiency.

Original languageEnglish (US)
Pages (from-to)223-230
Number of pages8
JournalBiochemical Journal
Issue number1
StatePublished - May 15 1998
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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