Syntaxin-5_N is the Sed5 N-terminal and the N-terminus of Syntaxin-5-like proteins. It is the region of Syntaxin that interacts with Sly1p, a positive regulator of intracellular membrane fusion, allowing SM (cytosolic Sec1/munc18-like) proteins to stay associated with the assembling fusion machinery. This allows the SM proteins to participate in late fusion steps [1].

1: Structural basis for the Golgi membrane recruitment of Sly1p by Sed5p. Bracher A, Weissenhorn W; EMBO J. 2002;21:6114-6124. PMID:12426383