Amino acid residues involved in catalysis and DNA binding by cytosine DNA methyltransferase MspI

S. K. Bhattacharya, A. K. Dubey

Research output: Contribution to journalArticle

3 Scopus citations


Chemical modifications of chosen amino acid residues: arginine, histidine, cysteine, glycine and tryptophan have been attempted to investigate their role in catalysis and DNA binding by MspI DNA methyltransferase (M.MspI). The catalytic inactivation following modifications of two arginine and three histidine moieties was a consequence of loss of DNA binding property of the methyltransferase. Modification of a single cysteine residue completely abolished the ability of M.MspI to transfer a methyl group but there was no loss of DNA binding activity. While tryptophan had no apparent functional role, glycine was critical for AdoMet binding and target base methylation by the M.MspI.

Original languageEnglish (US)
Pages (from-to)109-120
Number of pages12
JournalJournal of Biochemistry, Molecular Biology and Biophysics
Issue number2
StatePublished - Jan 1 2000



  • Amino acid residues
  • DNA methyltransferase
  • M.MspI

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Genetics
  • Molecular Biology

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