Enables several functions, including guanyl ribonucleotide binding activity; protein homodimerization activity; and syntaxin binding activity. Involved in positive regulation of exocytosis. Located in cleavage furrow; stress fiber; and synaptic vesicle. Part of septin complex. Orthologous to human SEPTIN5 (septin 5). [provided by Alliance of Genome Resources, Apr 2022]