Dynein light chain rp3 acts as a nuclear matrix-associated transcriptional modulator in a dynein-independent pathway. Academic Article uri icon

Overview

abstract

  • Cytoplasmic dynein is a motor protein complex involved in microtubule-based cargo movement. Previous biochemical evidence suggests that dynein light chain subunits also exist outside the dynein complex. Here we show that the dynein light chain rp3 is present in both the cytoplasm and the nucleus. Nuclear rp3 binds to and assembles with the transcription factor SATB1 at nuclear matrix-associated structures. Dynein intermediate chain was also detected in the nucleus, but it was dispensable for the rp3-SATB1 interaction. SATB1 facilitates the nuclear localization of rp3, whereas rp3 and dynein motor activity are not essential for nuclear accumulation of SATB1. The nuclear rp3-SATB1 protein complex is assembled with a DNA element of the matrix attachment region of the Bcl2 gene. Finally, rp3 is involved in SATB1-mediated gene repression of Bcl2. Our data provide evidence that dynein subunit rp3 has functions independent of the dynein motor.

publication date

  • August 1, 2005

Research

keywords

  • Dyneins
  • Matrix Attachment Region Binding Proteins
  • Nuclear Matrix
  • Nuclear Proteins
  • Transcription Factors

Identity

Scopus Document Identifier

  • 24344438985

Digital Object Identifier (DOI)

  • 10.1242/jcs.02472

PubMed ID

  • 16079286

Additional Document Info

volume

  • 118

issue

  • Pt 15