Further studies on the pathway of serine formation from carbohydrate.

D. M. Greenberg,A. Ichihara

Published 1957 in Journal of Biological Chemistry

ABSTRACT

In a previous paper (1) the authors reported on the enzymatic formation of serine from glyceric acid (GA), 3-phosphoglyceric acid (PGA), and 3-phosphohydroxypyruvic acid (PHPA).’ It was also suggested that the biosynthesis of serine might involve the following enzyme activities: a kinase phosphorylating GA, a dehydrogenase acting on PGA, a transaminase aminating PHPA, and the dephosphorylation of phosphoserine by phosphatase. It was not proved, however, in the previous work that phosphoserine was an obligatory intermediate in the reaction sequence between GA or PGA and serine. This evidence is now provided, and the results of further studies on the nature of the different steps of the above reaction sequence are reported.

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