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. Author manuscript; available in PMC: 2013 Sep 1.
Published in final edited form as: Arch Biochem Biophys. 2012 May 26;525(1):82–91. doi: 10.1016/j.abb.2012.05.012

Figure 3. Proposed mechanism of intramolecular electron transfer in tyrosine-cysteine-containing peptides.

Figure 3

The mechanism involves three discrete steps that may occur significantly separated in time: (1) deprotonation of the cysteine thiol; (2) intramolecular electron transfer from cysteine to tyrosine which determines KIET; and (3) protonation of the tyrosine phenolate.