F-box protein component of a SCF ubiquitin ligase complex involved in ubiquitin-dependent protein degradation. The SCF-DIA2 complex is specifically involved in the pheromone induced degradation of phosphorylated TEC1. Involved in DNA replication, genome stability, and the control of cell cycle, probably through its association to replication origins to facilitate the ubiquitination of another origin-binding protein (By similarity). Forms a SCF ubiquitin ligase complex which binds to DNA replication origins. Belongs to the DIA2 family.