CUE domains have been shown to bind ubiquitin [3-4]. It has been suggested that CUE domains are related to Pfam:PF00627 [4] and this has been confirmed by the structure of the domain [5]. CUE domains also occur in two protein of the IL-1 signal transduction pathway, tollip and TAB2 [2].

1: Role of Cue1p in ubiquitination and degradation at the ER surface. Biederer T, Volkwein C, Sommer T; Science 1997;278:1806-1809. PMID:9388185

2: Proteins of the endoplasmic-reticulum-associated degradation pathway: domain detection and function prediction. Ponting CP; Biochem J 2000;351:527-535. PMID:11023840

3: Ubiquitin Signals Protein Trafficking via Interaction with a Novel Ubiquitin Binding Domain in the Membrane Fusion Regulator, Vps9p. Donaldson KM, Yin H, Gekakis N, Supek F, Joazeiro CA; Curr Biol 2003;13:258-262. PMID:12573224

4: A ubiquitin-binding motif required for intramolecular monoubiquitylation, the CUE domain. Shih SC, Prag G, Francis SA, Sutanto MA, Hurley JH, Hicke L; EMBO J 2003;22:1273-1281. PMID:12628920

5: Solution structure of a CUE-ubiquitin complex reveals a conserved mode of ubiquitin binding. Kang RS, Daniels CM, Francis SA, Shih SC, Salerno WJ, Hicke L, Radhakrishnan I; Cell 2003;113:621-630. PMID:12787503