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. Author manuscript; available in PMC: 2012 May 31.
Published in final edited form as: Biochemistry. 2011 May 6;50(21):4813–4818. doi: 10.1021/bi200638x

Figure 1.

Figure 1

Reactions catalyzed by PfOPRT and HsOPRT and the relationship between BIE, kcat/Km KIE and kcat KIE. The substrate pair of orotidine–pyrophosphate (PPi) is shown. A similar transition state is formed when PPi is replaced with phosphonoacetic acid. Transition state features are shown in brackets.