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Reactions catalyzed by serine racemase: (A) racemization; (B) α, β-elimination. Lys56 of SR binds the PLP cofactor, forming an internal aldimine; then SR reacts with L-serine to yield an external aldimine; α-proton abstraction from this intermediate gives a resonance-stabilized carbanion. Two alternative pathways are possible starting from this intermediate (see text for details).
