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). Part of the phyA-mediated signaling transduction pathway leading to the regulation of gene expression and hypocotyls elongation in response to red and far-red light exposure. Protein modification; protein ubiquitination. Part of a SCF (ASK-cullin-F-box) protein ligase complex (By similarity). Interacts with SKP1A. Rhythmic expression with highest levels at the end of the dark phase, just before the transition to light. Induction by far-red light requires phyA. The kelch repeats form a beta-propeller structure involved in protein-protein interaction. The F-box is required for the interaction with SKP1A.