Plants glyceraldehyde-3-phosphate dehydrogenases

Aside from PEPCase, a number of other CAM-related genes have been partially characterised (Table 1). These include cDNA clones for pyruvate, orthophosphate dikinase (PPDK), a specific NADP malate dehydrogenase (MDH), glyceraldehyde phosphate dehydrogenase (GaPDH) and NADP-dependent malic enzyme (MOD). Previous studies indicated that the enzymatic activities of these gene products increased upon salt stress in the ice plant (Holtum Winter, 1982). As in the case... 

There are two different forms of glyceraldehyde-3-phosphate dehydrogenase in higher plant cells. 

Gowri, G. Campbell, W.H. (1989). cDNA clones for corn leaf NAD-H nitrate reductase and chloroplast NAD(P)+ glyceraldehyde-3-phosphate dehydrogenase. Characterization of the clones and analysis of the expression of the genes in leaves as influenced by nitrate in the light and dark. Plant Physiology 90, 792-8. 

Plants follow the Meyerhof pattern, but no less than three different glyceraldehyde-3-phosphate dehydrogenases exist one reacts with NAD, two with NADP, processes linked to photosynthesis. In older plant tissues, the pentose phosphate pathway is also utilized and up to 50 per cent of all carbohydrate may be metabolized by this route. 

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