The activity and malate inhibition/stimulation of phosphoenolpyruvate-carboxylase in crassulacean-acid-metabolism plants in their natural environment

Planta ◽  
1979 ◽  
Vol 147 (1) ◽  
pp. 31-36 ◽  
Author(s):  
D. J. von Willert ◽  
E. Brinckmann ◽  
B. Scheitler ◽  
D. A. Thomas ◽  
S. Treichel
Keyword(s):  
Natural Environment ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Stimulation Of

How to tell the time: the regulation of phosphoenolpyruvate carboxylase in Crassulacean acid metabolism (CAM) plants

2003 ◽  
Vol 31 (3) ◽  
pp. 728-730 ◽  
Author(s):  
H.G. Nimmo
Keyword(s):  
Circadian Rhythms ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Circadian Oscillator ◽  
Cam Plants ◽  
Reversible Phosphorylation ◽  
Circadian Expression ◽  
Phosphoenolpyruvate Carboxylase Kinase ◽  
Co2 Metabolism

Crassulacean acid metabolism (CAM) plants exhibit persistent circadian rhythms of CO2 metabolism. These rhythms are driven by changes in the flux through phosphoenolpyruvate carboxylase, which is regulated by reversible phosphorylation in response to a circadian oscillator. This article reviews progress in our understanding of the circadian expression of phosphoenolpyruvate carboxylase kinase.

scholarly journals Metabolite Activation of Crassulacean Acid Metabolism and C4 Phosphoenolpyruvate Carboxylase

1992 ◽  
Vol 100 (3) ◽  
pp. 1411-1416 ◽  
Author(s):  
Vahe Bandarian ◽  
William J. Poehner ◽  
Scott D. Grover
Keyword(s):  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism

Daily rhythm of phosphoenolpyruvate carboxylase in Crassulacean acid metabolism plants

Planta ◽  
1982 ◽  
Vol 156 (1) ◽  
pp. 92-94 ◽  
Author(s):  
J. Brulfert ◽  
J. Vidal ◽  
P. Gadal ◽  
O. Queiroz
Keyword(s):  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Daily Rhythm

scholarly journals Phosphoenolpyruvate carboxylase from pennywort (Umbilicus rupestris). Changes in properties after exposure to water stress

1984 ◽  
Vol 218 (2) ◽  
pp. 387-393 ◽  
Author(s):  
P P Daniel ◽  
J A Bryant ◽  
F I Woodward
Keyword(s):  
Water Stress ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Marked Decrease ◽  
Cam Plants ◽  
Allosteric Inhibitor ◽  
Allosteric Effector ◽  
Incomplete Form ◽  
C3 Photosynthesis

Umbilicus rupestris (pennywort) switches from C3 photosynthesis to an incomplete form of crassulacean acid metabolism (referred to as ‘CAM-idling’) when exposed to water stress (drought). This switch is accompanied by an increase in the activity of phosphoenolpyruvate carboxylase. This enzyme also shows several changes in properties, including a marked decrease in sensitivity to acid pH, a lower Km for phosphoenolpyruvate, very much decreased sensitivity to the allosteric inhibitor malate, and increased responsiveness to the allosteric effector glucose 6-phosphate. The Mr of the enzyme remains unchanged, at approx. 185 000. These changes in properties of phosphoenolpyruvate carboxylase are discussed in relation to the roles of the enzyme in C3 and in CAM plants.

Effect of Different CO2 Regimes on the Induction of Crassulacean Acid Metabolism in Mesembryanthemum crystallinum L

1979 ◽  
Vol 6 (6) ◽  
pp. 589 ◽  
Author(s):  
K Winter
Keyword(s):  
Water Stress ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
High Salinity ◽  
Stomatal Closure ◽  
Initial Step ◽  
Mesembryanthemum Crystallinum ◽  
Initial Event ◽  
Response To Water

Induction of crassulacean acid metabolism (CAM) in Mesembryanthemum crystallinum in response to high salinity was studied in plants grown in different CO2 regimes to determine whether the induction of CAM could be controlled by CO2 supply in the light and dark; a possible consequence of stomatal closure in response to water stress. The activity of extractable phosphoenolpyruvate carboxylase (EC 4.1.1.31) and the nocturnal change in malate content were followed at frequent intervals after onset of the treatments. The results suggest that the initial event during the induction of CAM is a change in the biochemical apparatus, indicated by the activity of phosphoenolpyruvate carboxylase, which then leads to the day/night fluctuations of malate synthesis typical of CAM. This initial step is not controlled by the availability of CO2 in the light or dark.

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