background:
Amisyn is a mostly cytosolic protein related to Tomosyn which plays an important role in SNARE complex assembly. Amisyn contains a v-SNARE coiled coil homology domain that binds to Syntaxin 1A and weakly to Syntaxin 4. Three isoforms exist for Amisyn. Isoform 1 is the full length protein, isoform 2 has a different amino acid sequence between residues 204-210 and isoform 3 is missing amino acids 1-102 and contains a different sequence for amino acids 103-150. Amisyn lacks a transmembrane domain and therefore is unable to assemble into a functional, membrane-anchored SNARE complex. This suggests that Amisyn may instead be acting to maintain SNARE conformation and facilitate the binding of VAMP-2. Amisyn can inhibit exocytosis independent of Syntaxin binding.
Function:
Forms non-fusogenic complexes with SNAP25 and STX1A and may thereby modulate the formation of functional SNARE complexes and exocytosis.
Subunit:
Part of a ternary complex containing SNAP25 and STX1A that can be dissociated by NAPA and NSF. Interacts with STX4A.
Subcellular Location:
Cytoplasm. Membrane.
Tissue Specificity:
Detected at low levels in brain, and at very low levels in heart, adrenal gland, testis, liver and kidney.
Similarity:
Contains 1 v-SNARE coiled-coil homology domain.
Database links:
UniProtKB/Swiss-Prot: Q8NFX7.2
Important Note:
This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications.
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