Histone-modifying enzymes: encrypting an enigmatic epigenetic code

Curr Opin Struct Biol. 2006 Dec;16(6):753-60. doi: 10.1016/j.sbi.2006.10.002. Epub 2006 Oct 27.


Histone-modifying enzymes catalyze a diverse array of post-translational modifications of core and linker histones within chromatin. These modifications govern a multitude of genomic functions, particularly gene expression, and are believed to constitute an epigenetic code. Histone-modifying enzymes inscribe this code by catalyzing site-selective modifications, which are subsequently interpreted by effector proteins that recognize specific covalent marks. The substrate specificity of these enzymes is of fundamental biological importance because it underpins this epigenetic code. Recently, the structural basis of this specificity has been examined with regards to recently determined structures of GCN5 acetyltransferases and SET domain methyltransferases in complex with their cognate histone substrates.

Publication types

  • Research Support, N.I.H., Extramural
  • Review

MeSH terms

  • Animals
  • Catalytic Domain
  • Epigenesis, Genetic*
  • Histone Acetyltransferases / chemistry*
  • Histone Acetyltransferases / metabolism*
  • Histone-Lysine N-Methyltransferase / chemistry*
  • Histone-Lysine N-Methyltransferase / metabolism*
  • Histones / metabolism*
  • Humans
  • In Vitro Techniques
  • Models, Molecular
  • Protein Conformation
  • Protein Processing, Post-Translational
  • Saccharomyces cerevisiae Proteins / chemistry
  • Saccharomyces cerevisiae Proteins / metabolism
  • Substrate Specificity
  • Tetrahymena thermophila / enzymology


  • Histones
  • Saccharomyces cerevisiae Proteins
  • Histone-Lysine N-Methyltransferase
  • Esa1 protein, S cerevisiae
  • Histone Acetyltransferases
  • tGCN5 histone acetyltransferase