||RAPGEF3 (Rap Guanine Nucleotide Exchange Factor 3) is a Protein Coding gene. Among its related pathways are Platelet activation, signaling and aggregation and Signaling by GPCR. GO annotations related to this gene include guanyl-nucleotide exchange factor activity and cAMP-dependent protein kinase regulator activity. An important paralog of this gene is RASGEF1A. uanine nucleotide exchange factor (GEF) for RAP1A and RAP2A small GTPases that is activated by binding cAMP. Through simultaneous binding of PDE3B to RAPGEF3 and PIK3R6 is assembled in a signaling complex in which it activates the PI3K gamma complex and which is involved in angiogenesis. Plays a role in the modulation of the cAMP-induced dynamic control of endothelial barrier function through a pathway that is independent on Rho-mediated signaling. Required for the actin rearrangement at cell-cell junctions, such as stress fibers and junctional actin. TPases are a group of enzymes that catalyze hydrolysis of the gamma phosphate bond in guanine triphosphate (GTP) to form guanine diphosphate (GDP). Mg2+ ions are essential for catalytic activity. GTPases, often coupled to G proteins, are essential in signal transduction.