Plays a role in the cell cycle. Involved in the formation of the ring of filaments in the neck region at the mother-bud junction during mitosis. Present at the bud neck during cell division. Expressed at higher levels in cells growing as hyphae than in those growing as budding yeasts. Belongs to the TRAFAC class TrmE-Era-EngA-EngB-Septin-like GTPase superfamily. Septin GTPase family.