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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: J Phys Org Chem. 2010 Jul 1;23(7):690–695. doi: 10.1002/poc.1688

Figure 5.

Figure 5

The chemical reaction catalyzed by purine nucleoside phosphorylase. It this were solution phase chemistry, one would suppose that this is an SN2 reaction with phosphate the attacking nucleophile. Our results show that the enzymatic reaction proceeds by a completely difference chemical mechanism.