Correlation Engine 2.0
Clear Search sequence regions


  • amino acid (1)
  • chromatin (3)
  • dna (1)
  • factors (5)
  • help (1)
  • heterochromatin (3)
  • Med5 (5)
  • peptides (1)
  • signals (1)
  • Srb4 (2)
  • yeast (1)
  • Sizes of these terms reflect their relevance to your search.

    The Mediator complex transmits activation signals from DNA bound transcription factors to the core transcription machinery. In addition to its canonical role in transcriptional activation, recent studies have demonstrated that S. cerevisiae Mediator can interact directly with nucleosomes, and their histone tails. Mutations in Mediator subunits have shown that Mediator and certain chromatin structures mutually impact each other structurally and functionally in vivo. We have taken a UV photo cross-linking approach to further delineate the molecular basis of Mediator chromatin interactions and help determine whether the impact of certain Mediator mutants on chromatin is direct. Specifically, by using histone tail peptides substituted with an amino acid analog that is a UV activatible crosslinker, we have identified specific subunits within Mediator that participate in histone tail interactions. Using Mediator purified from mutant yeast strains we have evaluated the impact of these subunits on histone tail binding. This analysis has identified the Med5 subunit of Mediator as a target for histone tail interactions and suggests that the previously observed effect of med5 mutations on telomeric heterochromatin and silencing is direct.

    Citation

    Zhongle Liu, Lawrence C Myers. Med5(Nut1) and Med17(Srb4) are direct targets of mediator histone H4 tail interactions. PloS one. 2012;7(6):e38416

    Expand section icon Mesh Tags

    Expand section icon Substances


    PMID: 22693636

    View Full Text