Fourth immunoglobulin (Ig)-like domain of stem cell factor receptor (SCFR)
Ig4_SCFR: The fourth Immunoglobulin (Ig)-like domain in stem cell factor receptor (SCFR). SCFR is organized as an extracellular component having five IG-like domains, a transmembrane segment, and a cytoplasmic portion having protein tyrosine kinase activity. SCFR and its ligand SCF are critical for normal hematopoiesis, mast cell development, melanocytes and gametogenesis. SCF binds to the second and third Ig-like domains of SCFR. This fourth Ig-like domain participates in SCFR dimerization, which follows ligand binding. Deletion of this fourth domain abolishes the ligand-induced dimerization of SCFR and completely inhibits signal transduction.