Transcriptional regulator that acts via the formation of large multiprotein complexes that modify and/or remodel the chromatin. Required for both gene activation and repression. Part of the Set3C complex, which is required to repress early/middle sporulation genes during meiosis. Required for the transcriptional activation of genes with high activity. Identified in the Set3C complex with HOS2, HST1, SNT1, SIF2, CPR1 and HOS4/YIL112W. Present with 623 molecules/cell in log phase SD medium. Belongs to the SET3 family.