FBXW5 is a member of the F-box protein family, members of which are 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 three classes: Fbws containing WD-40 domains, Fbls containing leucine-rich repeats, and Fbxs containing either different protein-protein interaction modules or no recognizable motifs. FBXW5 contains WD-40 domains, in addition to an F-box motif, so it belongs to the Fbw class. Alternatively spliced transcript variants encoding distinct isoforms have been identified for this gene, however, they were found to be nonsense-mediated mRNA decay (NMD) candidates, hence not represented.
Function:
Substrate recognition component of both SCF (SKP1-CUL1-F-box protein) and DCX (DDB1-CUL4-X-box) E3 ubiquitin-protein ligase complexes. Substrate recognition component of the SCF(FBXW5) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of SASS6 during S phase, leading to prevent centriole reduplication. Substrate-specific adapter of the DCX(FBXW5) E3 ubiquitin-protein ligase complex which mediates the polyubiquitination and subsequent degradation of TSC2. May also act as a negative regulator of MAP3K7/TAK1 signaling in the interleukin-1B (IL1B) signaling pathway.
Subunit:
Part of the SCF (SKP1-CUL1-F-box) E3 ubiquitin-protein ligase complex SCF(FBXW5) composed of CUL1, SKP1, RBX1 and FBXW5. Component of the DCX(FBXW5) E3 ubiquitin ligase complex, at least composed of (CUL4A or CUL4B), DDB1, FBXW5 and RBX1. Interacts with CDC20, TSC1, TSC2 and SASS6.
Subcellular Location:
Cytoplasm.
Post-translational modifications:
Ubiquitinated and degraded by the APC/C complex during mitosis and G1 phase.
Similarity:
Belongs to the FBXW5 family.
Contains 1 F-box domain.
Contains 3 WD repeats.
SWISS:
Q969U6
Gene ID:
54461
Database links:
Entrez Gene: 54461 Human
Omim: 609072 Human
SwissProt: Q969U6 Human
Unigene: 522507 Human
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