Involved in actin patch polarization. Required for maintaining a proper budding pattern in yeast cells. Required for proper polarized localization of the ADP-ribosylation factor ARF3 at the plasma membrane. Interacts with ARF3 (in GTP-bound form). Interacts with CNM67. Enriched at the nuclear envelope and at the plasma membrane, especially in daughter cells and at the bud neck. Mainly expressed in dividing cells, but not in stationary phase cells (at protein level). Present with 768 molecules/cell in log phase SD medium. Belongs to the AFI1/mesA family.