Stabilization of chromatin structure by PRC1, a Polycomb complex

Cell. 1999 Jul 9;98(1):37-46. doi: 10.1016/S0092-8674(00)80604-2.

Abstract

The Polycomb group (PcG) genes are required for maintenance of homeotic gene repression during development. Mutations in these genes can be suppressed by mutations in genes of the SWI/SNF family. We have purified a complex, termed PRC1 (Polycomb repressive complex 1), that contains the products of the PcG genes Polycomb, Posterior sex combs, polyhomeotic, Sex combs on midleg, and several other proteins. Preincubation of PRC1 with nucleosomal arrays blocked the ability of these arrays to be remodeled by SWI/SNF. Addition of PRC1 to arrays at the same time as SWI/SNF did not block remodeling. Thus, PRC1 and SWI/SNF might compete with each other for the nucleosomal template. Several different types of repressive complexes, including deacetylases, interact with histone tails. In contrast, PRC1 was active on nucleosomal arrays formed with tailless histones.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Animals, Genetically Modified
  • Chromatin / genetics
  • Chromatin / physiology*
  • Chromatin / ultrastructure*
  • Chromosomal Proteins, Non-Histone / genetics
  • Chromosomal Proteins, Non-Histone / metabolism
  • Crosses, Genetic
  • DNA-Binding Proteins / genetics
  • DNA-Binding Proteins / isolation & purification
  • DNA-Binding Proteins / metabolism*
  • Drosophila Proteins*
  • Drosophila melanogaster / genetics
  • Drosophila melanogaster / physiology*
  • Embryo, Nonmammalian / physiology
  • Female
  • Genes, Insect
  • Germ-Line Mutation
  • HeLa Cells
  • Histone Deacetylases / metabolism
  • Histones / metabolism
  • Humans
  • Insect Proteins / genetics
  • Insect Proteins / isolation & purification
  • Insect Proteins / metabolism*
  • Male
  • Mutagenesis, Insertional
  • Nucleoproteins / genetics
  • Nucleoproteins / isolation & purification
  • Nucleoproteins / metabolism*
  • Nucleosomes / physiology
  • Nucleosomes / ultrastructure
  • Polycomb Repressive Complex 1
  • Polycomb-Group Proteins
  • Repressor Proteins / genetics
  • Repressor Proteins / isolation & purification
  • Repressor Proteins / metabolism*
  • Transcription Factors / genetics
  • Transcription Factors / metabolism

Substances

  • Chromatin
  • Chromosomal Proteins, Non-Histone
  • DNA-Binding Proteins
  • Drosophila Proteins
  • Histones
  • Insect Proteins
  • Nucleoproteins
  • Nucleosomes
  • Pc protein, Drosophila
  • Polycomb-Group Proteins
  • Repressor Proteins
  • SCM protein, Drosophila
  • Transcription Factors
  • ph-d protein, Drosophila
  • Psc protein, Drosophila
  • Polycomb Repressive Complex 1
  • Histone Deacetylases