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Two substrates are better than one: dual specificities for Dnmt2 methyltransferases
Albert Jeltsch1, Wolfgang Nellen, Frank Lyko
1School of Engineering and Science, International University Bremen, Campus Ring 1, 28759 Bremen, Germany.
Trends in Biochemical Sciences
|May 9, 2006
Summary
DNA methyltransferase 2 (Dnmt2) enzymes show weak DNA methyltransferase activity but possess novel transfer RNA (tRNA) methyltransferase functions. This discovery broadens our understanding of Dnmt2
Area of Science:
- Biochemistry
- Molecular Biology
- Epigenetics
Background:
- DNA methyltransferase 2 (Dnmt2) enzymes are evolutionarily conserved and possess DNA methyltransferase motifs.
- Despite these motifs, Dnmt2 exhibits weak DNA methyltransferase activity, leaving its functions enigmatic.
Purpose of the Study:
- To investigate the biochemical and functional properties of Dnmt2 enzymes.
- To explore the potential broader biological roles of Dnmt2 beyond DNA methylation.
Main Methods:
- Enzyme activity assays to assess Dnmt2's catalytic functions.
- Biochemical characterization of Dnmt2 protein interactions and modifications.
Main Results:
- Dnmt2 enzymes demonstrate significant transfer RNA (tRNA) methyltransferase activity.
- This tRNA methyltransferase activity is a novel finding for Dnmt2 proteins.
Conclusions:
- Dnmt2's primary function is likely tRNA methylation, not DNA methylation.
- This finding redefines the biological roles and evolutionary significance of Dnmt2 enzymes.