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Proposed scheme of photochemical reactions in CarH (5, 6, 7). Postexcited-state charge transfer, the formation of 4′,5′-anhydroadenosine may be accompanied by hydride coordination to Co(III), with the resulting hydridocobalamin subsequently undergoing oxidation. X-ray crystallography has revealed His132 to be the final upper axial ligand of Co (5), which probably gets deprotonated by the nearby Glu129.
