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Publication Abstract from PubMed

EDD (or HYD) is an E3 ubiquitin ligase in the family of HECT (homologous to E6-AP C terminus) ligases. EDD contains an N-terminal ubiquitin-associated (UBA) domain, which is present in a variety of proteins involved in ubiquitin-mediated processes. Here, we use isothermal titration calorimetry (ITC), NMR titrations, and pull-down assays to show that the EDD UBA domain binds ubiquitin. The 1.85 A crystal structure of the complex with ubiquitin reveals the structural basis of ubiquitin recognition by UBA helices alpha1 and alpha3. The structure shows a larger number of intermolecular hydrogen bonds than observed in previous UBA/ubiquitin complexes. Two of these involve ordered water molecules. The functional importance of residues at the UBA/ubiquitin interface was confirmed using site-directed mutagenesis. Surface plasmon resonance (SPR) measurements show that the EDD UBA domain does not have a strong preference for polyubiquitin chains over monoubiquitin. This suggests that EDD binds to monoubiquitinated proteins, which is consistent with its involvement in DNA damage repair pathways.

Structural basis of ubiquitin recognition by the ubiquitin-associated (UBA) domain of the ubiquitin ligase EDD.,Kozlov G, Nguyen L, Lin T, De Crescenzo G, Park M, Gehring K J Biol Chem. 2007 Dec 7;282(49):35787-95. Epub 2007 Sep 25. PMID:17897937^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.