Science. 2002 Mar 15;295(5562):2080-3. Epub 2002 Feb 21.

Structure of HP1 chromodomain bound to a lysine 9-methylated histone H3 tail.

Source

Department of Biochemistry and Molecular Genetics, University of Virginia Health System, Charlottesville, VA 22908-0733, USA.

Abstract

The chromodomain of the HP1 family of proteins recognizes histone tails with specifically methylated lysines. Here, we present structural, energetic, and mutational analyses of the complex between the Drosophila HP1 chromodomain and the histone H3 tail with a methyllysine at residue 9, a modification associated with epigenetic silencing. The histone tail inserts as a beta strand, completing the beta-sandwich architecture of the chromodomain. The methylammonium group is caged by three aromatic side chains, whereas adjacent residues form discerning contacts with one face of the chromodomain. Comparison of dimethyl- and trimethyllysine-containing complexes suggests a role for cation-pi and van der Waals interactions, with trimethylation slightly improving the binding affinity.

PMID:: 11859155; [PubMed - indexed for MEDLINE]

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Research Support, U.S. Gov't, P.H.S.

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GM63959-01/GM/NIGMS NIH HHS/United States

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Structures reported by this article

Chromo Domain Of Hp1 Complexed With Histone H3 Tail Containing Trimethyllysine 9

PDB: 1KNE

Source: Drosophila melanogaster, synthetic construct

Method: X-Ray Diffraction

Resolution: 2.4 Å

See all 2 structures...

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