Component of SCF(ASK-cullin-F-box) E3 ubiquitin ligase complexes, which may mediate the ubiquitination and subsequent proteasomal degradation of target proteins (By similarity). Involved in the control of basipetal and acropetal auxin transport by promoting the distribution and expression of the auxin transporter PIN2 (PubMed:21653785). Promotes cytokinin-mediated cell expansion in the root elongation and differentiation zone, without affecting root cell division (PubMed:21653785). Protein modification; protein ubiquitination. Part of a SCF (ASK-cullin-F-box) protein ligase complex (By similarity). Interacts with SKP1A/ASK1, SKP1B/ASK2, ASK11 and ASK13 (PubMed:12169662). Induced by auxin. The F-box is necessary for the interaction with ASK proteins.