Soluble N-ethylmaleimide-sensitive factor attachment protein receptor complex within the porosome (SNARE complex)

The SNARE (Soluble N-ethylmaleimide-sensitive factor attachment protein receptor) complex within the porosome is the universal machinery for regulated exocytosis in all eukaryotic cells (Jena, B. P., 2002, PubMed). The porosome is a permanent, cup-shaped lipoprotein structure at the plasma membrane that serves as the secretory portal where vesicles dock and transiently fuse (Cho et al., 2002, PubMed). Within the porosome base, t-SNAREs such as Syntaxin and SNAP-25 interact with v-SNAREs like VAMP on the vesicle membrane to form a ring-like structure that facilitates membrane fusion and content release (UniProt). This complex is critical for physiological processes including neurotransmitter release and hormone secretion, and its dysfunction is linked to diseases like cystic fibrosis and diabetes (Jena, 2012, PubMed). Pharmacologically, the SNARE complex is the primary target of Botulinum neurotoxins, which cleave specific SNARE proteins to inhibit neurotransmission, making it a vital target for treating neuromuscular disorders and chronic pain (StatPearls, 2023).

Other names

Porosome-associated SNAREsSecretory portal SNARE complexVesicle fusion machineryt-SNARE/v-SNARE complexFusion pore SNAREs

Proteolytic cleavage of specific SNARE proteins (such as SNAP-25, Syntaxin, or VAMP/Synaptobrevin) by zinc-dependent endopeptidases, which prevents the assembly of the functional SNARE complex and inhibits vesicle fusion with the porosome base.