SWAP70 undergoes dynamic conformational regulation at the leading edge of migrating cells

FEBS Lett. 2019 Feb;593(4):395-405. doi: 10.1002/1873-3468.13326. Epub 2019 Jan 25.

Abstract

Rearrangements of the actin cytoskeleton are regulated in part by dynamic localised activation and inactivation of Rho family small GTPases. SWAP70 binds to and activates the small GTPase RAC1 as well as binding to filamentous actin and PIP3 . We have developed an encoded biosensor, which uses Forster resonance energy transfer to reveal conformational changes in SWAP70 in live cells. SWAP70 adopts a distinct conformation at the plasma membrane, which in migrating glioma cells is enriched at the leading edge but does not always associate with its PIP3 -dependent translocation to the membrane. This supports a role for SWAP70 in positive feedback activation of RAC1 at sites of filamentous actin, PIP3 and active RAC1.

Keywords: FRET; RAC1; SWAP70; phosphoinositide.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actin Cytoskeleton / metabolism
  • Animals
  • Biosensing Techniques
  • Cell Line, Tumor
  • Cell Membrane / chemistry
  • Cell Membrane / metabolism
  • Cell Movement
  • DNA-Binding Proteins / chemistry*
  • DNA-Binding Proteins / metabolism*
  • Fluorescence Resonance Energy Transfer
  • Gene Expression Regulation, Neoplastic
  • Glioma / metabolism*
  • Guanine Nucleotide Exchange Factors / chemistry*
  • Guanine Nucleotide Exchange Factors / metabolism*
  • Humans
  • Mice
  • Minor Histocompatibility Antigens / chemistry*
  • Minor Histocompatibility Antigens / metabolism*
  • Nuclear Proteins / chemistry*
  • Nuclear Proteins / metabolism*
  • Phosphatidylinositol Phosphates / metabolism
  • Protein Conformation
  • Pseudopodia / physiology*
  • Swiss 3T3 Cells
  • rac1 GTP-Binding Protein / metabolism

Substances

  • DNA-Binding Proteins
  • Guanine Nucleotide Exchange Factors
  • Minor Histocompatibility Antigens
  • Nuclear Proteins
  • Phosphatidylinositol Phosphates
  • RAC1 protein, human
  • SWAP70 protein, human
  • phosphatidylinositol 3,4,5-triphosphate
  • rac1 GTP-Binding Protein