Acidic protein, which assembles histones into an octamer (By similarity). Involved in the regulation of the localization and the function of the septins during mitosis. Component of the GIN4 complex which forms a ring at the bud neck. Has not been detected in the nucleus. Phosphorylation is cell cycle dependent and is important for its bud neck localization. Phosphorylation is highest in newly collected G1 cells, declines when the cells are traversing through the G1 phase, and reaches the lowest level around the time of bud emergence. Phosphorylation increases and remains high through the rest of the cell cycle until the beginning of the next one, when it decreases again. Phosphorylation involves two septin ring-associated kinases, CLA4 and GIN4, and its dephosphorylation occurs at the septin ring in a manner dependent on the phosphatases PP2A and CDC14. Leads to constitutive filamentous growth and abnormalities in both septin localization and organization. Exhibits greatly reduced virulence in a mouse model of systemic candidiasis. Belongs to the nucleosome assembly protein (NAP) family.