Component of the class 1 Sin3A-histone deacetylase (HDAC1/Rpd3) complex (HDAC). Appears to be a non-essential subunit of this complex which is not required for cell cycle regulation of progression through the G2 phase of the cell cycle (By similarity). Component of the class 1 Sin3A-histone deacetylase (HDAC1/Rpd3) complex (HDAC). Not essential for stability of the complex, recruitment of the complex to some promoters, or the deacetylase activity of the complex (By similarity). Belongs to the SAP30 family.