This gene encodes a member of the F-box protein family which is characterized by an approximately 40 amino acid motif, the F-box. The F-box proteins constitute one of the four subunits of ubiquitin protein ligase complex called SCFs (SKP1-cullin-F-box), which function in phosphorylation-dependent ubiquitination. The F-box proteins are divided into 3 classes: Fbws containing WD-40 domains, Fbls containing leucine-rich repeats, and Fbxs containing either different protein-protein interaction modules or no recognizable motifs. The protein encoded by this gene belongs to the Fbls class and, in addition to an F-box, contains several tandem leucine-rich repeats. Alternative splicing of this gene generates 2 transcript variants.[6]
FBXL5 is an iron sensor. It promotes IRP2 ubiquitination and then its degradation.
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Zhang N, Liu J, Ding X, Aikhionbare F, Jin C, Yao X (2007). "FBXL5 interacts with p150Glued and regulates its ubiquitination". Biochem. Biophys. Res. Commun. 359 (1): 34–9. doi:10.1016/j.bbrc.2007.05.068. PMID17532294.