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Proposed mechanism for UDP-galactose epimerase

Description
1. UDP-galactose is bound to the enzyme, which carries the coenzyme NAD+.

2. Hydride is transferred to NAD+ from C4 of the galactose ring to produce the carbonyl intermediate.

3. Hydride is then transferred back to C4 to give the opposite stereochemistry.

4. The product, UDP-glucose, is released.
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