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. Author manuscript; available in PMC: 2010 Nov 10.
Published in final edited form as: Biochemistry. 2009 Nov 10;48(44):10608–10619. doi: 10.1021/bi901353v

Figure 1.

Figure 1

Schematic depiction of the proton transfer reactions catalyzed by KSI. In the first step, the proton transfers from the C4 atom of the substrate to the Asp38 residue. In the second step, the proton transfers from the Asp38 residue to the C6 atom of the substrate. The reactant, intermediate, and product states of the overall reaction are labeled.