Novel complex of HAT protein TIP60 and nuclear receptor PXR promotes cell migration and adhesion

Sci Rep. 2017 Jun 16;7(1):3635. doi: 10.1038/s41598-017-03783-w.

Abstract

PXR is a member of nuclear receptor superfamily and a well-characterized mediator of xenobiotic metabolism. The classical mode of PXR activation involves its binding to appropriate ligand and subsequent heterodimerization with its partner RXR. However, various factors such as post-translational modifications and crosstalk with different cellular factors may also regulate the functional dynamics and behavior of PXR. In the present study, we have identified that TIP60, an essential lysine acetyltransferase protein interacts with unliganded PXR and together this complex promotes cell migration & adhesion. TIP60 utilizes its NR Box to interact with LBD region of PXR and acetylates PXR at lysine 170 to induce its intranuclear reorganization. Also, RXR is not required for TIP60-PXR complex formation and this complex does not induce ligand-dependent PXR target gene transactivation. Interestingly, we observed that PXR augments the catalytic activity of TIP60 for histones. This is the first report demonstrating the exclusive interaction of TIP60 with PXR and uncovers a potential role for the TIP60-PXR complex in cell migration and adhesion.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylation
  • Catalysis
  • Cell Adhesion* / genetics
  • Cell Movement* / genetics
  • Cell Nucleus / metabolism
  • Humans
  • Ligands
  • Lysine Acetyltransferase 5 / chemistry
  • Lysine Acetyltransferase 5 / genetics
  • Lysine Acetyltransferase 5 / metabolism*
  • Models, Biological
  • Models, Molecular
  • Protein Binding
  • Protein Conformation
  • Protein Interaction Domains and Motifs
  • Receptors, Cytoplasmic and Nuclear / chemistry
  • Receptors, Cytoplasmic and Nuclear / genetics
  • Receptors, Cytoplasmic and Nuclear / metabolism*
  • Structure-Activity Relationship

Substances

  • Ligands
  • Receptors, Cytoplasmic and Nuclear
  • KAT5 protein, human
  • Lysine Acetyltransferase 5