Required for normal septin function and cytokinesis. Component of the GIN4 complex composed of at least BNI5, CDC3, CDC10, CDC11, CDC12, GIN4, NAP1 and SHS1. Interacts directly with CDC11 and CDC12. Arrives at the bud site approximately coincident with bud emergence and dissociates from the septin scaffold before cytokinesis. Expression peaks during S phase of the cell cycle.