Enables syntaxin binding activity. Predicted to be involved in Golgi vesicle transport; negative regulation of autophagosome assembly; and positive regulation of protein catabolic process. Predicted to act upstream of or within vesicle-mediated transport. Located in COPI-coated vesicle. Part of SNARE complex. Is active in synaptic vesicle. Orthologous to human SEC22B (SEC22 homolog B, vesicle trafficking protein). [provided by Alliance of Genome Resources, Apr 2022]