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Serine racemase is an enzyme which generates D-serine from L-serine. D-serine acts as a neuronal signaling molecule by activating NMDA receptors in the brain.
Mammalian serine racemase is a pyridoxal 5'-phosphate dependent enzyme that catalyzes both the racemization of L-serine to D-serine and also the elimination of watre from L-serine, generating pyruvate and ammonoia. The enzyme is physiologically stimulated by divalent cations (e.g., magnesium) and ia allosterically activated by the complex Mg,ATP.
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