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Proposed reaction mechanism for d-glucose oxidation at C2 in pose A (a) and at C3 in pose B (b). Both His-512 and His-556 can act as catalytic bases, with a slight preference for His-556 in the case of C2-oxidation (pose A) and for His-512 for C3-oxidation (pose B). The two suggested schemes are in agreement with the reaction mechanism of the reductive half-reaction of the structurally related P2O [26]
