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UAS family; UAS is a domain of unknown function. Most members of this family are uncharacterized proteins with similarity to FAS-associated factor 1 (FAF1) and ETEA because of the presence of a UAS domain N-terminal to a ubiquitin-associated UBX domain. FAF1 is a longer protein, compared to the other members of this family, having additional N-terminal domains, a ubiquitin-associated UBA domain and a nuclear targeting domain. FAF1 is an apoptotic signaling molecule that acts downstream in the Fas signal transduction pathway. It interacts with the cytoplasmic domain of Fas, but not to a Fas mutant that is deficient in signal transduction. ETEA is the protein product of a highly expressed gene in T-cells and eosinophils of atopic dermatitis patients. The presence of the ubiquitin-associated UBX domain in the proteins of this family suggests the possibility of their involvement in ubiquitination. Recently, FAF1 has been shown to interact with valosin-containing protein (VCP), which is involved in the ubiquitin-proteosome pathway. Some members of this family are uncharacterized proteins containing only a UAS domain.
Jiyao W et al.(2023). "The conserved domain database in 2023.",