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The something about silencing protein, Sas3, is the catalytic subunit of NuA3, a yTAF(II)30-containing HAT complex that interacts with the Spt16 subunit of the yeast CP (Cdc68/Pob3)-FACT complex.

We have purified and characterized a Gcn5-independent nucleosomal histone H3 HAT complex, NuA3 (Nucleosomal Acetyltransferase of histone H3). Peptide sequencing of proteins from the purified NuA3 complex identified Sas3 as the catalytic HAT subunit of the complex. Sas3 is the yeast homolog of the human MOZ oncogene. Sas3 is required for both the HAT activity and the integrity of the NuA3 complex. In addition, NuA3 contains the TBP- associated factor, yTAF(II)30, which is also a component of the TFIID, TFIIF, and SWI/SNF complexes. Sas3 mediates interaction of the NuA3 complex with Spt16 both in vivo and in vitro. Spt16 functions as a component of the yeast CP (Cdc68/Pob3) and mammalian FACT (facilitates chromatin transcription) complexes, which are involved in transcription elongation and DNA replication. This interaction suggests that the NuA3 complex might function in concert with FACT-CP to stimulate transcription or replication elongation through nucleosomes by providing a coupled acetyltransferase activity.

Pubmed ID: 10817755


  • John S
  • Howe L
  • Tafrov ST
  • Grant PA
  • Sternglanz R
  • Workman JL


Genes & development

Publication Data

May 15, 2000

Associated Grants


Mesh Terms

  • Acetyltransferases
  • Amino Acid Sequence
  • Binding Sites
  • Carrier Proteins
  • Catalytic Domain
  • Cell Cycle Proteins
  • DNA Replication
  • DNA-Binding Proteins
  • Fungal Proteins
  • Gene Expression Regulation, Fungal
  • HeLa Cells
  • Histone Acetyltransferases
  • Humans
  • Models, Biological
  • Molecular Sequence Data
  • Molecular Weight
  • Multienzyme Complexes
  • Mutation
  • Precipitin Tests
  • Protein Binding
  • Protein Kinases
  • Recombinant Fusion Proteins
  • Saccharomyces cerevisiae
  • Saccharomyces cerevisiae Proteins
  • TATA-Binding Protein Associated Factors
  • Transcription Factor TFIID
  • Transcription Factors
  • Transcription, Genetic
  • Transcriptional Elongation Factors
  • Two-Hybrid System Techniques