Biochemistry (Moscow)

, Volume 75, Issue 9, pp 1115–1125 | Cite as

Inhibition of murine DNA methyltransferase Dnmt3a by DNA duplexes containing pyrimidine-2(1H)-one

Article

Abstract

Here we studied the inhibition of the catalytic domain of Dnmt3a methyltransferase (Dnmt3a-CD) by DNA duplexes containing the mechanism-based inhibitor pyrimidine-2(1H)-one (P) instead of the target cytosine. It has been shown that conjugates of Dnmt3a-CD with P-DNA (DNA containing pyrimidine-2(1H)-one) are not stable to heating at 65°C in 0.1% SDS. The yield of covalent intermediate increases in the presence of the regulatory factor Dnmt3L. The importance of the DNA minor groove for covalent intermediate formation during the methylation reaction catalyzed by Dnmt3a-CD has been revealed. P-DNA was shown to inhibit Dnmt3a-CD; the IC50 is 830 nM. The competitive mechanism of inhibition of Dnmt3a-CD by P-DNA has been elucidated. It is suggested that therapeutic effect of zebularine could be achieved by inhibition of not only Dnmt1 but also Dnmt3a.

Key words

pyrimidine-2(1H)-one covalent intermediate competitive inhibition eukaryotic DNA methyltransferase 

Abbreviations

AdoHcy

S-adenosyl-l-homocysteine

AdoMet

S-adenosyl-l-methionine

AzaC

5-azacytosine

C5-MTase

C5-cytosine-DNA-methyltransferase

DB(11)

dimeric bisbenzimidazole

FAM

6-carboxyfluorescein

FC

5-fluorocytosine

GST

glutathione S-transferase

NEM

N-ethylmaleimide

P

pyrimidine-2(1H)-one

P

fluorescence polarization

P-DNA

DNA containing pyrimidine-2(1H)-one

Tm

melting temperature

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Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  • N. A. Cherepanova
    • 1
  • A. L. Zhuze
    • 2
  • E. S. Gromova
    • 1
  1. 1.Faculty of ChemistryLomonosov Moscow State UniversityMoscowRussia
  2. 2.Engelhardt Institute of Molecular BiologyRussian Academy of SciencesMoscowRussia

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