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Figure 5.
Fig. 5. Redox-controlled proton collection and supply by
His-503. Only one of the water arrays connecting W207 and W4 and
two other possible hydrogen-bonding groups to W207 is shown for
the sake of simplicity. The red and blue structures represent
the oxidized and reduced (or electron-released and
electron-accepted) states of the redox site (or sites)
controlling the conformation of the imidazole of His-503. The
structures before the oxidation state change are the stable
oxidized and reduced states. The circles with arrowheads
indicate the rotation of the imidazole group during the
transition.
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