1FZY:
reference: Structure of a conjugating enzyme-ubiquitin thiolester intermediate reveals a novel role for the ubiquitin tail., Hamilton KS, Ellison MJ, Barber KR, Williams RS, Huzil JT, McKenna S, Ptak C, Glover M, Shaw GS, Structure (Camb) 2001 Oct;9(10):897-904. PMID: 11591345

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