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CUE domain found in E3 ubiquitin-protein ligase UBR5 and similar proteins UBR5, also called E3 ubiquitin-protein ligase, HECT domain-containing 1, hyperplastic discs protein homolog (HYD), progestin-induced protein, EDD, or Rat100, belongs to the E3 protein family of HECT (homologous to E6-AP C-terminus) ligases. It is frequently overexpressed in breast and ovarian cancer, suggesting a role in cancer development. UBR5 is involved in DNA-damage signaling. It can ubiquitinate DNA topoisomerase II-binding protein 1 (TopBP1) in the presence of the E2 enzyme UBCH4. It also activates the DNA-damage checkpoint kinase CHK2. Moreover, UBR5 interacts with the calcium and integrin-binding protein (CIB) in a DNA-damage-dependent manner. It functions as the substrate of the extracellular signal-regulated kinases (ERKs) 1 and 2. It also acts as a ubiquitin ligase that controls the levels of poly(A)-binding protein-interacting protein 2. In addition, UBR5 ubiquitinates and up-regulates beta-catenin, regulates transcription, and activates smooth-muscle differentiation through its ability to stabilize myocardin. UBR5 contains an N-terminal CUE domain, a zinc-finger-like domain termed the ubiquitin-recognin (UBR) box, a MLLE (mademoiselle) domain, and a C-terminal catalytic HECT domain. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",