The Drosophila CLAMP protein associates with diverse proteins on chromatin

PLoS One. 2017 Dec 27;12(12):e0189772. doi: 10.1371/journal.pone.0189772. eCollection 2017.


Gaining new insights into gene regulation involves an in-depth understanding of protein-protein interactions on chromatin. A powerful model for studying mechanisms of gene regulation is dosage compensation, a process that targets the X-chromosome to equalize gene expression between XY males and XX females. We previously identified a zinc finger protein in Drosophila melanogaster that plays a sex-specific role in targeting the Male-specific lethal (MSL) dosage compensation complex to the male X-chromosome, called the Chromatin-Linked Adapter for MSL Proteins (CLAMP). More recently, we established that CLAMP has non-sex-specific roles as an essential protein that regulates chromatin accessibility at promoters genome-wide. To identify associations between CLAMP and other factors in both male and female cells, we used two complementary mass spectrometry approaches. We demonstrate that CLAMP associates with the transcriptional regulator complex Negative Elongation Factor (NELF) in both sexes and determine that CLAMP reduces NELF recruitment to several target genes. In sum, we have identified many new CLAMP-associated factors and provide a resource for further study of this little understood essential protein.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Binding Sites
  • Chromatin / metabolism*
  • DNA-Binding Proteins / metabolism*
  • Drosophila Proteins / metabolism*
  • Female
  • Immunoprecipitation
  • Male
  • Protein Binding
  • Transcription Factors / metabolism


  • CLAMP protein, Drosophila
  • Chromatin
  • DNA-Binding Proteins
  • Drosophila Proteins
  • Transcription Factors