t-SNARE involved in diverse vesicle trafficking and membrane fusion processes, including cell plate formation. May function in the secretory pathway. Interacts with the cytokinesis-specific syntaxin KNOLLE and with SYP121 (PubMed:11718726). Binds to EXO70B2 (PubMed:21199889). Plasma membrane, some endomembrane compartment and cell plate in dividing cells. Ubiquitous, with a strong expression in root tips, ovules, very young leaves, vascular tissue, hydathodes, stipules and the abscission and dehiscence zones of the siliques. Localy and systemically induced by pathogen infection and localy only by mechanical stresses. Belongs to the SNAP-25 family.