The proline-rich protein palladin is a binding partner for profilin

FEBS J. 2006 Jan;273(1):26-33. doi: 10.1111/j.1742-4658.2005.05036.x.

Abstract

Palladin is an actin-associated protein that has been suggested to play critical roles in establishing cell morphology and maintaining cytoskeletal organization in a wide variety of cell types. Palladin has been shown previously to bind directly to three different actin-binding proteins vasodilator-stimulated phosphoprotein (VASP), alpha-actinin and ezrin, suggesting that it functions as an organizing unit that recruits actin-regulatory proteins to specific subcellular sites. Palladin contains sequences resembling a motif known to bind profilin. Here, we demonstrate that palladin is a binding partner for profilin, interacting with profilin via a poly proline-containing sequence in the amino-terminal half of palladin. Double-label immunofluorescence staining shows that palladin and profilin partially colocalize in actin-rich structures in cultured astrocytes. Our results suggest that palladin may play an important role in recruiting profilin to sites of actin dynamics.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Binding Sites / genetics
  • COS Cells
  • Cell Adhesion Molecules / metabolism
  • Chlorocebus aethiops
  • Cytoskeletal Proteins / genetics
  • Cytoskeletal Proteins / metabolism*
  • Dose-Response Relationship, Drug
  • Fluorescent Antibody Technique
  • HeLa Cells
  • Humans
  • Mice
  • Microfilament Proteins / metabolism
  • Models, Genetic
  • Molecular Sequence Data
  • Phosphoproteins / genetics
  • Phosphoproteins / metabolism*
  • Profilins / metabolism*
  • Proline / genetics
  • Proline / metabolism
  • Recombinant Proteins / genetics
  • Recombinant Proteins / metabolism
  • Surface Plasmon Resonance / methods
  • Swiss 3T3 Cells
  • Time Factors
  • Transfection

Substances

  • Cell Adhesion Molecules
  • Cytoskeletal Proteins
  • Microfilament Proteins
  • PALLD protein, human
  • Phosphoproteins
  • Profilins
  • Recombinant Proteins
  • palladin protein, mouse
  • vasodilator-stimulated phosphoprotein
  • Proline