Nature Research, Nature Chemical Biology, 3(9), p. 154-156, 2013
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It is widely accepted that ubiquitin conjugating enzymes (E2) contain an active site asparagine that serves as an oxyanion hole, thereby stabilizing a negatively charged transition state intermediate and promoting ubiquitin transfer. Using structural and biochemical approaches to study the role of the conserved asparagine to ubiquitin conjugation by Ubc13/Mms2, we conclude that the importance of this residue stems primarily from its structural role in stabilizing an active site loop.