This domain is approximately 50 amino acids long, and is usually found in the N-terminal half of a variety of proteins. Two motifs that are commonly found associated with the F-box domain are the leucine rich repeats (LRRs; Pfam:PF00560 and Pfam:PF07723) and the WD repeat (Pfam:PF00400). The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression [1-2].

1: SKP1 connects cell cycle regulators to the ubiquitin proteolysis machinery through a novel motif, the F-box. Bai C, Sen P, Hofmann K, Ma L, Goebl M, Harper JW, Elledge SJ; Cell 1996;86:263-274. PMID:8706131

2: F-box proteins are receptors that recruit phosphorylated substrates to the SCF ubiquitin-ligase complex. Skowyra D, Craig KL, Tyers M, Elledge SJ, Harper JW; Cell. 1997;91:209-219. PMID:9346238