Volume 12, Issue 2 p. 206-222
Review

Structure and Function of Mammalian DNA Methyltransferases

Dr. Renata Zofia Jurkowska

Dr. Renata Zofia Jurkowska

Biochemistry Laboratory, School of Engineering and Science, Jacobs University, Bremen, Campus Ring 1, 28759 Bremen (Germany), Fax: (+49) 421-200-3249

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Dr. Tomasz Piotr Jurkowski

Dr. Tomasz Piotr Jurkowski

Biochemistry Laboratory, School of Engineering and Science, Jacobs University, Bremen, Campus Ring 1, 28759 Bremen (Germany), Fax: (+49) 421-200-3249

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Prof. Dr. Albert Jeltsch

Corresponding Author

Prof. Dr. Albert Jeltsch

Biochemistry Laboratory, School of Engineering and Science, Jacobs University, Bremen, Campus Ring 1, 28759 Bremen (Germany), Fax: (+49) 421-200-3249

Biochemistry Laboratory, School of Engineering and Science, Jacobs University, Bremen, Campus Ring 1, 28759 Bremen (Germany), Fax: (+49) 421-200-3249Search for more papers by this author
First published: 29 November 2010
Citations: 494

Graphical Abstract

New model of genomic DNA methylation: The introduction of 5-methylcytosine (see picture) into DNA is an essential epigenetic signal involved in development and disease. We review the structures and functions of the mammalian DNA methyltransferases Dnmt1, Dnmt3a and Dnmt3b, including novel mechanisms involved in their targeting and regulation.

Abstract

DNA methylation plays an important role in epigenetic signalling, having an impact on gene regulation, chromatin structure, development and disease. Here, we review the structures and functions of the mammalian DNA methyltransferases Dnmt1, Dnmt3a and Dnmt3b, including their domain structures, catalytic mechanisms, localisation, regulation, post-translational modifications and interaction with chromatin and other proteins, summarising data obtained in genetic, cell biology and enzymatic studies. We focus on the question of how the molecular and enzymatic properties of these enzymes are connected to the dynamics of DNA methylation patterns and to the roles the enzymes play in the processes of de novo and maintenance DNA methylation. Recent enzymatic and genome-wide methylome data have led to a new model of genomic DNA methylation patterns based on the preservation of average levels of DNA methylation in certain regions, rather than the methylation states of individual CG sites.