Plasma membrane t-SNARE that mediates docking of transport vesicles (By similarity). Necessary for the translocation of SLC2A4 from intracellular vesicles to the plasma membrane (By similarity). In neurons, recruited at neurite tips to membrane domains rich in the phospholipid 1-oleoyl-2-palmitoyl-PC (OPPC) which promotes neurite tip surface expression of the dopamine transporter SLC6A3/DAT by facilitating fusion of SLC6A3-containing transport vesicles with the plasma membrane (PubMed:32963038). Together with STXB3 and VAMP2, may also play a role in docking/fusion of intracellular GLUT4-containing vesicles with the cell surface in adipocytes and in docking of synaptic vesicles at presynaptic active zones (By similarity). Found in a complex with VAMP8 and SNAP23. Detected in a complex with SNAP23 and STXBP4. Interacts with SNAP23 and SNAPIN. Interacts with VAMP2. Interacts with LLGL1. Interacts (via C-terminus) with CENPF. Interacts with DOC2B. Interacts with STXBP3; excludes interaction with DOC2B and SNAP25. Interacts with STXBP4; excludes interaction with VAMP2 (By similarity). Component of the SNARE complex composed of STX4, SNAP23 and VAMP7 that interacts with SYT7 during lysosomal exocytosis. Interacts with STXBP6. Interacts with STXBP5L (By similarity). Localizes to neurite tips in neuronal cells. Expressed in all tissues tested including adipose, brain, testis, intestine, liver, heart, spleen, skeletal muscle and kidney. Belongs to the syntaxin family.