Syntaxin 4, like most SNAREs, is a type IV membrane protein with a relatively large N-terminus containing the SNARE motif located in the cytoplasmic side and a transmembrane domain located close to the C-terminus that functions as an anchor.nSyntaxin 4 functions as a plasma membrane protein t-SNARE and has been shown to have an important role in pancreatic b-cell insulin secretion and in insulin-stimulated glucose uptake in skeletal muscle and adipose tissue by means of translocation of the glucose transporter GLUT4 from an intracellular compartment to the plasma membrane
