Component of SCF(ASK-cullin-F-box) E3 ubiquitin ligase complexes, which may mediate the ubiquitination and subsequent proteasomal degradation of target proteins. Confers sensitivity to ABA during seed germination and early seedling development. Protein modification; protein ubiquitination. Part of a SCF (SKP1-cullin-F-box) protein ligase complex. Interacts with SKP1A/ASK1 and XERICO. Ubiquitous. Expressed early during seed germination, especially in the preemergent radicle. During imbibition of seeds. Belongs to the TUB family.