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 of the type of F- box protein. In the SCF complex; it serves as an adapter that links the F-box protein to CUL1. SCF(UFO) is required for vegetative and floral organ development as well as for male gametogenesis. SCF(TIR1) is involved in auxin signaling pathway. SCF(COI1) regulates responses to jasmonates. SCF(EID1) and SCF(AFR) are implicated in phytochrome A light signaling. SCF(ADO1); SCF(ADO2); SCF(ADO3) are related to the circadian clock. SCF(ORE9) seems to be involved in senescence. SCF(EBF1/EBF2) may regulate ethylene signaling. Plays a role during embryogenesis and early postembryonic development; especially during cell elongation and division. Contributes to the correct chromosome segregation during tetrad formation. {ECO:0000269|PubMed:10398681; ECO:0000269|PubMed:10500191; ECO:0000269|PubMed:10528262; ECO:0000269|PubMed:11526079; ECO:0000269|PubMed:12970487; ECO:0000269|PubMed:14688296}.