SNAP-Associated Protein (SNAPIN) Recombinant Protein

The protein encoded by this gene is a coiled-coil-forming protein that associates with the SNARE (soluble N-ethylmaleimide-sensitive fusion protein attachment protein receptor) complex of proteins and the BLOC-1 (biogenesis of lysosome-related organelles) complex. Biochemical studies have identified additional binding partners. As part of the SNARE complex, it is required for vesicle docking and fusion and regulates neurotransmitter release. The BLOC-1 complex is required for the biogenesis of specialized organelles such as melanosomes and platelet dense granules. Mutations in gene products that form the BLOC-1 complex have been identified in mouse strains that are models of Hermansky-Pudlak syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2012]

SNAPIN: a component of the SNARE complex of proteins that is required for synaptic vesicle docking and fusion. May modulate a step between vesicle priming, fusion and calcium-dependent neurotransmitter release by potentiating the interaction of synaptotagmins with the SNAREs and the plasma-membrane-associated protein SNAP25. Its phosphorylation state influences exocytotic protein interactions and may regulate synaptic vesicle exocytosis. May also have a role in the mechanisms of SNARE-mediated membrane fusion in non-neuronal cells. Phosphorylation by PKA modulates its interaction with the SNARE complex.

Protein type: Vesicle

Chromosomal Location of Human Ortholog: 1q21.3

Cellular Component: Golgi membrane; Golgi apparatus; synaptic vesicle; transport vesicle; cytoplasmic vesicle membrane; synaptic vesicle membrane; perinuclear region of cytoplasm; nucleolus; synapse; cell junction; secretory granule

Molecular Function: SNARE binding; protein binding

Biological Process: synaptic vesicle fusion to presynaptic membrane; intracellular protein transport; synaptic vesicle exocytosis; viral reproduction; synaptic vesicle maturation; melanosome organization and biogenesis; neurotransmitter secretion; regulation of protein binding; anterograde synaptic vesicle transport; synaptic vesicle transport; endosome to lysosome transport; anterograde axon cargo transport; neurite development