Rap guanine nucleotide exchange factor 2 (RAPGEF2)

Rap guanine nucleotide exchange factor 2 (RAPGEF2) is a large multi-domain cytosolic protein acting as a **guanine nucleotide exchange factor (GEF)** for the Rap1 and Ras families of small GTPases, linking cell surface receptor signals (notably via cAMP) to intracellular activation of these GTPases. It is involved in multiple developmental and physiological processes, including neuronal migration, neuritogenesis, maintenance of podocyte and endothelial cell structure, and establishment of cell polarity. RAPGEF2 is transiently upregulated in migrating neurons during cortical development, helps regulate cytoskeletal remodeling, and is essential for the correct wiring of the brain. It is also implicated in vascular development and renal function, where it interacts with MAGI2 and maintains podocyte integrity. Dysregulation or genetic disruption of RAPGEF2 contributes to disease states such as cancer, kidney disease, epilepsy, and Alzheimer’s disease. **Key molecular features include a PDZ domain and a cyclic nucleotide binding domain, allowing cAMP-dependent regulation especially in neurons and endocrine cells**. RAPGEF2 modulates ERK signaling downstream of dopamine D1 receptors and other Gs-coupled GPCRs in the nervous system. **No drugs directly target RAPGEF2 in clinical use**, but alterations in its function or expression are being investigated as contributors to neurodegenerative, renal, and oncological pathologies.

Other names

PDZ-GEF1KIAA0313NRAPGEPPDZGEF1CNrasGEFnRap GEPRA-GEFCyclic nucleotide ras GEFNeural RAP guanine nucleotide exchange proteinPDZ domain-containing guanine nucleotide exchange factor 1Ras/Rap1-associating GEF-1Rap GEPRAGEF

Not directly drugged; theoretically, inhibitors could act by modulating its GEF activity, interfering with cAMP binding, blocking protein–protein interactions (e.g., with MAGI2 or Rap1)