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. 2001 Nov 6;98(23):12932–12937. doi: 10.1073/pnas.231463798

Figure 4.

Figure 4

Potential mechanisms for thioether bond formation in galactose oxidase. (a) Mechanisms involving initial Tyr→Cu electron transfer. (b) Mechanisms involving initial mono-oxygenation of Cys-228 to a sulfenate group. Species A is a [Cu(II)-Y] intermediate that is common to both mechanisms.