Serine biosynthesis starts from 3-phosphoglycerate (3PG), a glycolysis intermediate. Its dehydrogenation to 3-phosphonooxypyruvic acid (3POPA) is catalysed by tetrameric phosphoglycerate dehydrogenase (PHGDH). (Tabatabaie et al. 2009).
Berger, R, Geboers, AJ, van den Berg, IE, Klomp, LW, Tabatabaie, L, de Koning, TJ
phosphoglycerate dehydrogenase activity of PHGDH tetramer [cytosol]
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