Involved in ubiquitination and subsequent proteasomal degradation of target proteins. Together with CUL1, RBX1 and a F-box protein, it forms a SCF E3 ubiquitin ligase complex. The functional specificity of this complex depends on the type of F-box protein. In the SCF complex, it serves as an adapter that links the F-box protein to CUL1 (By similarity). Protein modification; protein ubiquitination. Part of a SCF (SKP1-cullin-F-box) protein ligase complex (By similarity). Interacts with CPR1/CPR30. Expressed in leaves and flowers. Expressed at low levels in the inflorescence meristem (IM) and young flowers. Later confined to sepals, petals and stamen filaments. Detectable in the valve and seed coat. Belongs to the SKP1 family.