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, PP2A13, PP2B10, UFO, SKIP2, SKIP15, SKIP16, SKIP32, CPR1/CPR30, At1g55000, At1g67340, At1g78100, At3g04660, At3g16740, At3g61590, At4g38940 and At5g49610. Expressed in young seedlings, cotyledons, roots, leaves, floral stems, inflorescences, pollen, and siliques, with a slightly higher level in inflorescence than in other tissues. Expressed in the inflorescence meristem (IM) and young buds, particularly in stamen. Also detected in pollen grains. Belongs to the SKP1 family. Extended C-terminus.