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© Jacob SEELER & Anne DEJEAN, Institut Pasteur
Immunostaining of PML nuclear bodies involved in acute promyelocytic leukemia
Publication : EMBO reports

Coordinated methyl and RNA binding is required for heterochromatin localization of mammalian HP1alpha

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in EMBO reports - 13 Sep 2002

Muchardt C, Guilleme M, Seeler JS, Trouche D, Dejean A, Yaniv M

Link to Pubmed [PMID] – 12231507

EMBO Rep. 2002 Oct;3(10):975-81

In mammalian cells, as in Schizosaccharomyces pombe and Drosophila, HP1 proteins bind histone H3 tails methylated on lysine 9 (K9). However, whereas K9-methylated H3 histones are distributed throughout the nucleus, HP1 proteins are enriched in pericentromeric heterochromatin. This observation suggests that the methyl-binding property of HP1 may not be sufficient for its heterochromatin targeting. We show that the association of HP1alpha with pericentromeric heterochromatin depends not only on its methyl-binding chromo domain but also on an RNA-binding activity present in the hinge region of the protein that connects the conserved chromo and chromoshadow domains. Our data suggest the existence of complex heterochromatin binding sites composed of methylated histone H3 tails and RNA, with each being recognized by a separate domain of HP1alpha.

https://www.ncbi.nlm.nih.gov/pubmed/12231507