The Ras/Rap GTPase activating protein RASA3: from gene structure to in vivo functions

Adv Biol Regul. 2015 Jan;57:153-61. doi: 10.1016/j.jbior.2014.09.006. Epub 2014 Sep 28.


RASA3 (or GTPase Activating Protein III, R-Ras GTPase-activating protein, GAP1(IP4BP)) is a GTPase activating protein of the GAP1 subfamily which targets Ras and Rap1. RASA3 was originally purified from pig platelet membranes through its intrinsic ability to bind inositol 1,3,4,5-tetrakisphosphate (I(1,3,4,5)P4) with high affinity, hence its first name GAP1(IP4BP) (for GAP1 subfamily member which binds I(1,3,4,5)P4). RASA3 was thus the first I(1,3,4,5)P4 receptor identified and cloned. The in vitro and in vivo functions of RASA3 remained somewhat elusive for a long time. However, recently, using genetically-modified mice and cells derived from these mice, the function of RASA3 during megakaryopoiesis, megakaryocyte adhesion and migration as well as integrin signaling has been reported. The goal of this review is thus to summarize and comment recent and less recent data in the literature on RASA3, in particular on the in vivo function of this specific GAP1 subfamily member.

Keywords: Cancer; GTPase activating protein; Leukemia; Megakaryocyte; Platelet; RASA3; Rap; Ras.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Cell Adhesion / physiology
  • Cell Movement / physiology*
  • GTPase-Activating Proteins* / genetics
  • GTPase-Activating Proteins* / metabolism
  • Humans
  • Inositol Phosphates
  • Mice
  • Mice, Transgenic
  • Receptors, Cytoplasmic and Nuclear* / genetics
  • Receptors, Cytoplasmic and Nuclear* / metabolism
  • Signal Transduction / physiology*
  • Thrombopoiesis / physiology*


  • GTPase-Activating Proteins
  • Inositol Phosphates
  • RASA3 protein, mouse
  • Receptors, Cytoplasmic and Nuclear
  • inositol-1,3,4,5-tetrakisphosphate receptor
  • inositol-1,3,4,5-tetrakisphosphate