The actin-capping protein CapG localizes to microtubule-dependent organelles during the cell cycle

Biochem Biophys Res Commun. 2009 Feb 27;380(1):166-70. doi: 10.1016/j.bbrc.2009.01.064. Epub 2009 Jan 21.

Abstract

Extensive cross-talk between the actin and the microtubule cytoskeletons has been reported. Especially in mitosis, processes dependent on actin- and microtubule-based structures alternate and regulate each other in a complex cascade leading to division into two daughter cells. Here, we have studied the subcellular localization of the filamentous actin-capping protein CapG. Fluorescence microscopy of endogenous CapG and EGFP-tagged CapG revealed CapG localization at the mother centriole in interphase, the mitotic spindle in mitosis and the midbody ring in abscission. Surprisingly, nucleoporin Nup62, an interaction partner of CapG, also localized to the midbody ring at the end of abscission and colocalized with CapG. We propose a role for the actin-binding protein CapG as a mediator of cross-talk between the actin cytoskeleton and microtubule-based organelles that regulate cell division.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actins / metabolism
  • Animals
  • Cell Cycle*
  • Centrosome / metabolism
  • Dogs
  • Humans
  • Interphase
  • Microfilament Proteins / metabolism*
  • Microtubules / metabolism*
  • Nuclear Proteins / metabolism*
  • Spindle Apparatus / metabolism*

Substances

  • Actins
  • Microfilament Proteins
  • Nuclear Proteins
  • CAPG protein, human