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, EBF1, SKP2A, At3g61590, At4g38940 and At5g49610. Expressed in young seedlings, roots, leaves, floral stems, inflorescences, pollen, and siliques. Highly expressed in the pith and vascular bundle in the stem. Found in the pedicel of young buds. In siliques, mostly expressed in inner epidermis of the valve. Belongs to the SKP1 family. Extended N-terminus. Extended N-terminus. Extended N-terminus.