Required for haploid cells axial budding pattern. Acts as an anchor to help direct new growth components and/or polarity establishment components like the BUD5 GTP/GDP exchange factor to localize at the cortical axial budding site. Regulates septin organization in late G1 independently of its role in polarity-axis determination. Interacts with BEM1, BUD3, BUD4, BUD5, CDC24 and CDC42. In small buds, localizes to incipient bud sites, emerging buds and to the bud periphery. In large buds, localizes as a ring at the bud neck. Requires ERV14 to be efficiently delivered to the cell surface. Recruitment to the bud neck after S/G2 phase of the cell cycle depends on BUD3 and BUD4. Expression shows a peak at the start of the cell cycle just before bud emergence in late G1 phase. O-glycosylated by PMT4 and N-glycosylated. O-glycosylation increases activity in daughter cells by enhancing stability and promoting localization to the plasma membrane. May also be O-glycosylated by PMT1 and PMT2. Present with 396 molecules/cell in log phase SD medium. Ref.5 refers to this gene as REV7. REV7 is however the adjacent gene.