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. Author manuscript; available in PMC: 2014 Apr 25.
Published in final edited form as: Carbohydr Res. 2009 Mar 27;344(9):1072–1078. doi: 10.1016/j.carres.2009.03.026

Figure 1.

Figure 1

Proposed mechanism for the conversion of UDP-GlcA to UDP-xylose and UDP-apiose catalyzed by UAXS. The UDP-4-keto-xylose structure is depicted in the keto form, but it is most likely in equilibrium with the hydrated gem-diol form. The numbering schemes of the UDP-GlcA and UDP-apiose are independent. Carbon 4 of UDP-GlcA (marked with an asterisk) becomes carbon 3 of UDP-apiose. Note that the ring protons have been left off for clarity.