Self-interaction of heterochromatin protein 1 is required for direct binding to histone methyltransferase, SUV39H1

Biochem Biophys Res Commun. 2003 Feb 7;301(2):287-92. doi: 10.1016/s0006-291x(02)03021-8.


Heterochromatin protein 1 (HP1) binds to the nucleosome via a methylated lysine residue 9 of histone H3 which is catalyzed by a histone methyltransferase such as SUV39H1. Although co-localization of HP1 and SUV39H1 has been evident in immunostaining and immunoprecipitation experiments, direct protein-protein interactions have remained to be characterized. We examined interactions between mouse HP1 alpha (mHP1 alpha) and SUV39H1 in yeast and in vitro. A yeast two-hybrid and a glutathione S-transferase pull-down study indicated that the chromo shadow domain of mHP1 alpha directly interacts with the N-terminal 39 amino acid stretch of SUV39H1. The IY165/168EE mutation in the chromo shadow domain of mHP1 alpha abrogated a self-interaction and this mutant did not interact with SUV39H1. The 13-mer peptide containing a consensus sequence for binding to the dimer surface formed by the chromo shadow domains inhibited interaction between mHP1 alpha and SUV39H1. It seems that self-interaction through the chromo shadow domain of HP1 is crucial for recruitment of SUV39H1 onto nucleosomes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Binding Sites
  • Chromosomal Proteins, Non-Histone / genetics
  • Chromosomal Proteins, Non-Histone / metabolism*
  • Dimerization
  • Histone-Lysine N-Methyltransferase / genetics
  • Histone-Lysine N-Methyltransferase / metabolism*
  • Humans
  • Methyltransferases / genetics
  • Methyltransferases / metabolism*
  • Mice
  • Molecular Sequence Data
  • Peptides / genetics
  • Peptides / metabolism
  • Protein Binding
  • Protein Structure, Tertiary
  • Recombinant Fusion Proteins / metabolism
  • Repressor Proteins / genetics
  • Repressor Proteins / metabolism*
  • Sequence Alignment
  • Two-Hybrid System Techniques


  • Chromosomal Proteins, Non-Histone
  • Peptides
  • Recombinant Fusion Proteins
  • Repressor Proteins
  • heterochromatin-specific nonhistone chromosomal protein HP-1
  • SUV39H1 protein, human
  • Suv39h1 protein, mouse
  • Methyltransferases
  • Histone-Lysine N-Methyltransferase