Cold Inactivation of Phosphoenolpyruvate Carboxylase and Pyruvate Orthophosphate Dikinase from the C4 Perennial Plant Atriplex halimus

Cold Inactivation of Phosphoenolpyruvate Carboxylase and Pyruvate Orthophosphate Dikinase from... Phosphoenolpyruvate carboxylase (PEPC) and pyruvate orthophosphate dikinase (PPDK) cold inactivation was studied in leaf extracts from Atriplex halimus L. Both enzyme activities gradually reduced as the temperature and the total soluble protein decreased. Mg2+ at a concentration of 10 mM stabilized PEPC and PPDK activities against cold inactivation. At low Mg2+ concentration (4 mM), PEPC was strongly protected by phosphoenolpyruvate, glucose-6-phosphate, and, partially, byL-malate, while PPDK was protected by PEP, but not by its substrate, pyruvate. High concentrations of compatible solutes (glycerol, betaine, proline, sorbitol and trehalose) proved to be good protectants for both enzyme activities against cold inactivation. When illuminated leaves were exposed to low temperature, PPDK was partially inactivated, while the activity of PEPC was not altered. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Cold Inactivation of Phosphoenolpyruvate Carboxylase and Pyruvate Orthophosphate Dikinase from the C4 Perennial Plant Atriplex halimus

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Publisher
Springer Journals
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1014849506484
Publisher site
See Article on Publisher Site

Abstract

Phosphoenolpyruvate carboxylase (PEPC) and pyruvate orthophosphate dikinase (PPDK) cold inactivation was studied in leaf extracts from Atriplex halimus L. Both enzyme activities gradually reduced as the temperature and the total soluble protein decreased. Mg2+ at a concentration of 10 mM stabilized PEPC and PPDK activities against cold inactivation. At low Mg2+ concentration (4 mM), PEPC was strongly protected by phosphoenolpyruvate, glucose-6-phosphate, and, partially, byL-malate, while PPDK was protected by PEP, but not by its substrate, pyruvate. High concentrations of compatible solutes (glycerol, betaine, proline, sorbitol and trehalose) proved to be good protectants for both enzyme activities against cold inactivation. When illuminated leaves were exposed to low temperature, PPDK was partially inactivated, while the activity of PEPC was not altered.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 13, 2004

References

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