D-isomer specific 2-hydroxyacid dehydrogenase
2-Aminomalonate semialdehyde + Hydrogen Ion + NADPH ↔ L-Serine + NADP
3-phosphoserine aminotransferase / phosphohydroxythreonine aminotransferase
D-3-phosphoglycerate dehydrogenase / α-ketoglutarate reductase
Secondary Metabolites: Cysteine Biosynthesis from Serine
Hydrogen sulfide + O-Acetylserine → Acetic acid + Hydrogen Ion + L-Cysteine
3-Phosphoglyceric acid + NAD → Hydrogen Ion + NADH + Phosphohydroxypyruvic acid
L-Glutamic acid + Phosphohydroxypyruvic acid → DL-O-Phosphoserine + Oxoglutaric acid
DL-O-Phosphoserine + Water → L-Serine + Phosphate
Acetyl-CoA + L-Serine → Coenzyme A + O-Acetylserine