4JQU:
reference: A Structurally Unique E2-Binding Domain Activates Ubiquitination by the ERAD E2, Ubc7p, through Multiple Mechanisms., Metzger MB, Liang YH, Das R, Mariano J, Li S, Li J, Kostova Z, Byrd RA, Ji X, Weissman AM, Mol Cell. 2013 May 23;50(4):516-27. doi: 10.1016/j.molcel.2013.04.004. Epub 2013 , May 9. PMID: 23665230

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