Substrate-recognition component of the SCF(FBXO31) protein ligase complex, which specifically mediates the ubiquitination of proteins amidated at their C-terminus in response to oxidative stress, leading to their degradation by the proteasome (PubMed:39880951). FBXO31 specifically recognizes and binds C-terminal peptides bearing an amide: C-terminal amidation in response to oxidative stress takes place following protein fragmentation (PubMed:39880951). The SCF(FBXO31) also plays a role in G1 arrest following DNA damage by mediating ubiquitination of phosphorylated cyclin-D1 (CCND1), promoting its degradation by the proteasome, resulting in G1 arrest (PubMed:19412162, PubMed:29279382). The SCF(FBXO31) complex is however not a major regulator of CCND1 stability during the G1/S transition (By similarity). In response to genotoxic stress, the SCF(FBXO31) complex directs ubiquitination and degradation of phosphorylated MDM2, thereby promoting p53/TP53-mediated DNA damage response (PubMed:26124108). SCF(FBXO31) complex is required for genomic integrity by catalyzing ubiquitination and degradation of cyclin-A (CCNA1 and/or CCNA2) during the G1 phase (PubMed:31413110). In response to genotoxic stress, the SCF(FBXO31) complex directs ubiquitination and degradation of phosphorylated FBXO46 and MAP2K6 (PubMed:24936062, PubMed:30171069). SCF(FBXO31) complex promotes ubiquitination and degradation of CDT1 during the G2 phase to prevent re-replication (PubMed:24828503). The SCF(FBXO31) complex also mediates ubiquitination and degradation of DUSP6, OGT and PARD6A (PubMed:23469015, PubMed:34686346, PubMed:39894887). {ECO:0000250|UniProtKB:Q3TQF0, ECO:0000269|PubMed:19412162, ECO:0000269|PubMed:23469015, ECO:0000269|PubMed:24828503, ECO:0000269|PubMed:24936062, ECO:0000269|PubMed:26124108, ECO:0000269|PubMed:29279382, ECO:0000269|PubMed:30171069, ECO:0000269|PubMed:31413110, ECO:0000269|PubMed:34686346, ECO:0000269|PubMed:39880951, ECO:0000269|PubMed:39894887}. This is the function of ENSG00000103264 (FBXO31, F-box protein 31).