A novel RNA binding surface of the TAM domain of TIP5/BAZ2A mediates epigenetic regulation of rRNA genes

Irina Anosova, Svitlana Melnik, Konstantinos Tripsianes, Fatiha Kateb, Ingrid Grummt, Michael Sattler

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The chromatin remodeling complex NoRC, comprising the subunits SNF2h and TIP5/BAZ2A, mediates heterochromatin formation at major clusters of repetitive elements, including rRNA genes, centromeres and telomeres. Association with chromatin requires the interaction of the TAM (TIP5/ARBP/MBD) domain of TIP5 with noncoding RNA, which targets NoRC to specific genomic loci. Here, we show that the NMR structure of the TAM domain of TIP5 resembles the fold of the MBD domain, found in methyl-CpG binding proteins. However, the TAM domain exhibits an extended MBD fold with unique C-terminal extensions that constitute a novel surface for RNA binding. Mutation of critical amino acids within this surface abolishes RNA binding in vitro and in vivo. Our results explain the distinct binding specificities of TAM and MBD domains to RNA and methylated DNA, respectively, and reveal structural features for the interaction of NoRC with non-coding RNA.

Original languageEnglish (US)
Pages (from-to)5208-5220
Number of pages13
JournalNucleic acids research
Volume43
Issue number10
DOIs
StatePublished - Apr 3 2015

Fingerprint

rRNA Genes
Epigenomics
Untranslated RNA
RNA
Chromatin Assembly and Disassembly
Heterochromatin
Centromere
Telomere
Chromatin
Carrier Proteins
Amino Acids
Mutation
DNA

ASJC Scopus subject areas

  • Genetics

Cite this

A novel RNA binding surface of the TAM domain of TIP5/BAZ2A mediates epigenetic regulation of rRNA genes. / Anosova, Irina; Melnik, Svitlana; Tripsianes, Konstantinos; Kateb, Fatiha; Grummt, Ingrid; Sattler, Michael.

In: Nucleic acids research, Vol. 43, No. 10, 03.04.2015, p. 5208-5220.

Research output: Contribution to journalArticle

Anosova, Irina ; Melnik, Svitlana ; Tripsianes, Konstantinos ; Kateb, Fatiha ; Grummt, Ingrid ; Sattler, Michael. / A novel RNA binding surface of the TAM domain of TIP5/BAZ2A mediates epigenetic regulation of rRNA genes. In: Nucleic acids research. 2015 ; Vol. 43, No. 10. pp. 5208-5220.
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