Component of SCF(ASK-cullin-F-box) E3 ubiquitin ligase complexes, which may mediate the ubiquitination and subsequent proteasomal degradation of target proteins. Negative regulator of the phyA signaling pathway that shifts the responsiveness of the phyA signaling system associated with hypocotyl elongation from red to far-red wavelength. Protein modification; protein ubiquitination. Probable component of an E3 ubiquitin ligase SCF complex. Interacts with SKP1A/ASK1 and SKP1B/ASK2. The F-box domain is required for the interaction with SKP1A and SKP1B. 'Empfindlicher im dunkelroten licht' means sensitive to far-red light in German.