Syntaxin-1B is a protein that in humans is encoded by the STX1B gene.

Syntaxins are cellular receptors for transport vesicles (see MIM 603765). One of these proteins, designated syntaxin 1B (STX1B), is directly implicated in the process of calcium-dependent synaptic transmission in rat brain (Smirnova et al., 1993 [PubMed 8105537]). The expression of this protein is transiently induced by long-term potentiation of synaptic responses in the rat hippocampus. The protein may play an important role in the excitatory pathway of synaptic transmission, which is known to be implicated in several neurologic diseases.[supplied by OMIM, Nov 2010]. Sequence Note: This RefSeq record was created from transcript and genomic sequence data to make the sequence consistent with the reference genome assembly. The genomic coordinates used for the transcript record were based on transcript alignments.
Function: Potentially involved in docking of synaptic vesicles at presynaptic active zones. May mediate Ca(2+)-regulation of exocytosis acrosomal reaction in sperm (By similarity).