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FBXO5

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 the 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 Fbxs class. This protein is similar to xenopus early mitotic inhibitor-1 (Emi1), which is a mitotic regulator that interacts with Cdc20 and inhibits the anaphase promoting complex. Alternatively spliced transcript variants encoding different isoforms have been identified.
Predicted location

Intracellular

Single cell type specificity

Cell type enhanced (Erythroid cells, Spermatocytes, Extravillous trophoblasts, Spermatogonia)

Immune cell specificity

Low immune cell specificity

Cell line specificity

Low cell line specificity

Interaction

Part of a SCF (SKP1-cullin-F-box) protein ligase complex (By similarity). Interacts with BTRC; mediates proteolysis by the SCF ubiquitin ligase complex leading to activation of APC in late mitosis and subsequent mitotic progression (PubMed:12791267). Interacts with FZR1/CDH1 and the N-terminal substrate-binding domain of CDC20; prevents APC activation (PubMed:11988738). Also interacts with EVI5 which blocks its phosphorylation by PLK1 and prevents its subsequent binding to BTRC and degradation (PubMed:16439210). Interacts simultaneously with anaphase promoting complex (APC), through at least ANAPC2, CDC23, CDC27, the APC substrate GMNN and the APC activator FZR1 (PubMed:23708001, PubMed:26083744). Interacts with UBE2S; interferes with the activity of UBE2S mainly by disrupting the dynamic electrostatic association between the C-terminal tail of UBE2S and ANAPC2 (PubMed:23708001). Interacts with RPS6KA2; cooperates to induce the metaphase arrest of early blastomeres; increases and stabilizes interaction of FBXO5 with CDC20 (By similarity).

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