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). Plays a role during early flowers reproductive development. Protein modification; protein ubiquitination. Part of a SCF (SKP1-cullin-F-box) protein ligase complex (By similarity). Interacts with ADO3/FKF1, COI1/FBL2, EBF1/FBL6, PP2B10, At3g61590 and At5g49610. Expressed in young seedlings, roots, leaves, floral stems, inflorescences, and siliques, with a slightly higher level in inflorescence than in other tissues. Belongs to the SKP1 family.