Involved in cytokinesis and possibly cellularization (PubMed:8181057). Also acts as an enhancer of the sina gene, thus having a role in photoreceptor development (PubMed:8181057). May be involved in p53-dependent apoptosis (PubMed:17456438). Likely part of a multicomponent septin complex that includes Sep1 (PubMed:8590810). Interacts with Sep1 (PubMed:8590810). Interacts with hil (PubMed:15818553). Interacts with park (PubMed:17456438). Localized to the cleavage furrow of dividing cells during cytokinesis and to the intercellular bridge connecting postmitotic daughter cells. Equally found on the cell surfaces of the embryonic central nervous system and on the apical membranes of developing photoreceptor cells in the eye imaginal disk (PubMed:8181057). Colocalizes with hil at the cell cortex (PubMed:15818553). Accumulates at the leading edge of the cleavage furrow in dividing cells and cellularizing embryos (at protein level). Maternal gene products found in the early embryo prior to zygotic transcription. Ubiquitinated by park, leading to its degradation by the proteasome. Belongs to the TRAFAC class TrmE-Era-EngA-EngB-Septin-like GTPase superfamily. Septin GTPase family.