The amino group needed for serine biosynthesis comes from glutamate (L-Glu). Its transfer onto 3-phosphonooxpyruvate (3POPA) is catalysed by PSAT1 dimer which needs pyridoxal phosphate (PXLP) as cofactor. (Baek et al. 2003)
Baek, JY, Jun, DY, Taub, D, Kim, YH
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