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. Author manuscript; available in PMC: 2010 Aug 14.
Published in final edited form as: J Mol Biol. 2009 Jun 3;391(2):327–340. doi: 10.1016/j.jmb.2009.05.081

Figure 1.

Figure 1

Interconversion of UDP-Galp and UDP-Galf is catalyzed by UGM. (a) The reaction catalyzed by UGM. (b) Nucleophilic mechanism for catalysis by UGM; the reaction could proceed by either SN1 or SN2 as described previously.25 N1 is depicted as negatively charged as reported.22