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J. Biol. Chem., Vol. 275, Issue 45, 34963-34967, November 10, 2000
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From the Genetisches Institut der Justus-Liebig-Universität
Gießen, Heinrich-Buff-Ring 58, D-35392 Gießen, Germany
Different mechanisms mediating
methylation-dependent repression have been demonstrated.
Two of these mechanisms play a role in the context of the
granulocyte/macrophage-specific lysozyme gene: direct interference with
DNA binding of the transcription factor GA-binding protein and
deacetylation of histones. Besides enhancement in the unmethylated
state, and transcriptional repression upon DNA methylation, the
lysozyme downstream enhancer confers tissue-specific demethylation.
Because both demethylation activity and repression ability have been
attributed to the methyl-CpG-binding domain-containing protein MBD2, we
analyzed this protein. The short form MBD2b binds to the methylated
lysozyme enhancer and mediates transcriptional repression. MBD2b is
capable of binding to the transcriptional repressor Sin3A. The
interaction domain of Sin3A required for binding to MBD2b contains the
paired amphipathic helix 3. We identified a minimal functional domain
that confers both transcriptional repression as well as the interaction
to Sin3A. In contrast to the functionally related proteins MeCP2 and
MBD1, the repression domain of MBD2b overlaps with the
methyl-CpG-binding domain.
To whom correspondence should be addressed. Tel.: 49-641-99-35460;
Fax: 49-641-99-35469; E-mail: Rainer.Renkawitz@gen.bio. uni-giessen.de.
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