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. Author manuscript; available in PMC: 2013 Feb 16.
Published in final edited form as: J Phys Chem B. 2012 Feb 3;116(6):1942–1950. doi: 10.1021/jp210578f

Figure 1.

Figure 1

A simplified catalytic cycle of SO. The Mo(VI)Fe(III) state numbered as 1 is the resting state of the enzyme. The Mo(V)Fe(III) state (number 4) is the only state with both of the metal centers being paramagnetic. This state is used in this work for the EPR distance measurements. The straight arrow connecting states 1 and 4 shows the preparation of the Mo(V)Fe(III) state from the resting state by Ti(III) citrate reduction of the Mo center.