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. 1983 Nov;73(3):735–739. doi: 10.1104/pp.73.3.735

Photoregulation of Phosphoenolpyruvate Carboxylase in Salsola soda L. and Other C4 Plants 1

George Karabourniotis 1,2, Yiannis Manetas 1, Nikos A Gavalas 1
PMCID: PMC1066540  PMID: 16663292

Abstract

Photoactivation of phosphoenolpyruvate carboxylase was found to occur in several, though not all, C4 species examined; Salsola soda L. was used for a detailed study of this effect of light.

Activity differences between light and darkness are maximized when glycerol (25% v/v) is included in the extraction medium and in the absence of mercaptoethanol. In plants grown in the growth chamber, the night-form of the enzyme, in addition to low activity, shows a positive cooperativity (with phosphoenolpyruvate), which is gradually abolished by light of increasing intensities. This allosteric behavior is absent in plants adapted to a high light environment. Activation and deactivation, under light and darkness respectively, are quite fast, suggesting post-translational regulation. The photoactivation appears to depend on photosynthetic electron flow, since it is saturated at high photon fluxes (around 1000 microeinsteins per square meter per second) and inhibited by 3-(3,4-dichlorophenyl)-1,1-dimethylurea.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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