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. Author manuscript; available in PMC: 2020 May 25.
Published in final edited form as: Nat Catal. 2019 Nov 25;2(12):1115–1123. doi: 10.1038/s41929-019-0382-8

Fig. 6. Proposed enzymatic mechanism of UAXS.

Fig. 6

In steps a – c, the proton transferred by Cys100 to and from the C3' is indicated as Hb. In step c, the ring closure to give UDP-4-keto-xylose (5) is not detectably reversible. In step d, the reductions are indicated to be reversible in principle. However, oxidation of UDP-xylose (3) by UAXS was not detectable.11,12