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d-Psicose 3-epimerase from Agrobacterium tumefacience catalyzes the conversion of d-fructose to d-psicose. According to mutational analysis, the ring at position 112, the negative charge at position 156, and the positive charge at position 215 were essential components for enzyme activity and for binding fructose and psicose. The surface contact area and distance to the bound substrate by molecular...
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