NSF attachment protein alpha (NAPA)

NSF attachment protein alpha (NAPA, also known as Alpha-SNAP) is a ubiquitously expressed, soluble cofactor required for intracellular vesicle fusion and membrane trafficking. It is a key mediator in the SNARE complex cycle, facilitating membrane docking and fusion by bridging N-ethylmaleimide-sensitive factor (NSF) with SNARE proteins, and stimulating NSF ATPase activity necessary for SNARE complex disassembly. This enables recycling of SNAREs and supports repeated rounds of membrane fusion, fundamental for exocytosis, secretion, cell-cell adhesion, and cell-matrix interactions. NAPA is crucial in processes such as synaptic transmission, hormone secretion, maintenance of epithelial/endothelial barriers, and cellular homeostasis. Dysfunction or dysregulation of NAPA has been associated with enhanced seizure susceptibility, developmental syndromes, defects in cell adhesion, possible roles in cancer metastasis, and abnormal development in assisted reproductive technologies. No approved drugs directly target the protein, and its essential and ubiquitous function currently limits its therapeutic tractability[1][2][3][4][5][6][7].

Other names

Alpha-soluble NSF attachment proteinAlpha-SNAPAlpha soluble NSF attachment proteinSNAPASNAP-alphaN-ethylmaleimide-sensitive factor attachment protein alphaN-ethylmaleimide-sensitive factor attachment protein, alphaSNAA (UniProt recommended protein name)NSF attachment protein alpha

Not applicable; no drugs known to directly target NAPA/α-SNAP. (Intervention in vesicle trafficking is generally considered too fundamental and non-specific for therapeutic targeting.)