NDP52 activates nuclear myosin VI to enhance RNA polymerase II transcription

Nat Commun. 2017 Nov 30;8(1):1871. doi: 10.1038/s41467-017-02050-w.

Abstract

Myosin VI (MVI) has been found to be overexpressed in ovarian, breast and prostate cancers. Moreover, it has been shown to play a role in regulating cell proliferation and migration, and to interact with RNA Polymerase II (RNAPII). Here, we find that backfolding of MVI regulates its ability to bind DNA and that a putative transcription co-activator NDP52 relieves the auto-inhibition of MVI to enable DNA binding. Additionally, we show that the MVI-NDP52 complex binds RNAPII, which is critical for transcription, and that depletion of NDP52 or MVI reduces steady-state mRNA levels. Lastly, we demonstrate that MVI directly interacts with nuclear receptors to drive expression of target genes, thereby suggesting a link to cell proliferation and migration. Overall, we suggest MVI may function as an auxiliary motor to drive transcription.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Nucleus / metabolism*
  • DNA / metabolism*
  • Gene Knockdown Techniques
  • HeLa Cells
  • Humans
  • MCF-7 Cells
  • Myosin Heavy Chains / metabolism*
  • Nuclear Proteins / metabolism*
  • Protein Folding*
  • RNA Polymerase II / genetics*
  • Sf9 Cells
  • Spodoptera
  • Transcription, Genetic
  • Transcriptional Activation

Substances

  • CALCOCO2 protein, human
  • Nuclear Proteins
  • myosin VI
  • DNA
  • RNA Polymerase II
  • Myosin Heavy Chains