Glyceraldehyde-3-phosphate dehydrogenase distribution

Reaction (6) is similar to that catalyzed by the D-glyceric dehydrogenase described by Stafford et al. (328) and reported to be widely distributed in green leaves. However, preparations of the carboxyla-tion enzyme contain little or no triosephosphate dehydrogenase and the stimulation by TPN (387), found with crude spinach extracts, is absent with the purified preparations. Glyceraldehyde 3 phosphate has been shown not to be a free intermediate in PGA formation from RuDP (386). 

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