Syntaxin-4 is a membrane-associated SNARE protein involved in fusion at the plasma cell membrane. In regulated GLUT4 delivery, it participates with compatible partners in the fusion machinery that exposes transporters at the cell surface. Its presence identifies a possible component of that machinery; productive fusion also depends on assembly and regulation of the whole SNARE complex. [ref]
UniProtKB by the UniProt Consortium. Q12846, Function, Catalytic activity and Subunit structure
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