UBE2F

DOMAIN ARCHITECTURE MISMATCH

Review rationale: F8WDQ9 lacks the reference UBE2F catalytic Cys116 and a complete UBC core. Moreover, the characterized full-length enzyme conjugates NEDD8, not ubiquitin. A UBC-domain match does not establish ubiquitin-protein transferase activity. Neither F8WDQ9 nor the canonical Q969M7 product carries this term in GOA, where the gene's experimental MF is NEDD8 conjugating enzyme activity; a PubMed search found no report of ubiquitin transfer by UBE2F.

Review rationale: F8WDQ9 is a 101-residue product that matches canonical Q969M7 residues 1-94 only. It lacks canonical residues 95-178, which hold the HPN motif and the catalytic thioester Cys116, so it covers only 70 of the 154 residues of the UBC core. The gene's known link to protein ubiquitination is indirect. Full-length UBE2F conjugates NEDD8 to cullin-5 through Cys116, and this activates CRL5 ubiquitin ligases. That catalytic route is not available to F8WDQ9. The product does keep the N-terminal UBA3-docking extension (residues 1-29) and the acetylated N-terminus that binds DCNL co-E3s, and UBE2F N-terminal peptides alone can inhibit DCNLs. A regulatory or competitive binding role in CRL5 activation, and so in ubiquitination, is therefore plausible but neither shown nor excluded. There is no positive refutation, so the call is uncertain. The term is absent from GOA for both F8WDQ9 and canonical Q969M7, whose process annotations are protein neddylation.