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Inhibition of fructokinase and sucrose synthase by cytosolic levels of fructose in young tomato fruit undergoing transient starch synthesis
Year:
1997
Source of publication :
Physiologia Plantarum
Authors :
Petreikov, Marina
;
.
Schaffer, Arthur
;
.
Volume :
101
Co-Authors:
Schaffer, A.A., Dept of Vegetable Crops, Volcani Center-ARO, 50250 Bet Dagan, Israel
Petreikov, M., Dept of Vegetable Crops, Volcani Center-ARO, 50250 Bet Dagan, Israel
Facilitators :
From page:
800
To page:
806
(
Total pages:
7
)
Abstract:
Immature tomato fruit are characterized by a transient period of starch accumulation. Sucrose synthase (EC 2.4.1.13) and fructokinase (EC 2.7.1.4) are two of the initial enzymes in the sucrose to starch synthetic pathway. Both enzymes in tomato fruit are significantly inhibited by fructose at concentrations physiological to young tomato fruit. Compartmental analysis is immature fruit pericarp indicates that fructose is not specifically compartmentalized in the vacuole and that physiological cytosolic concentrations of fructose in young tomato fruit are above 30 mM. Such physiological levels of fructose significantly inhibit sucrose synthase cleavage activity as well as the activity of a partially purified fructokinase. These data suggest a mechanism of a coordinated, in vivo regulation of tomato sucrose synthase and fructokinase activity, which may be potentially limiting to starch accumulation in young tomato fruit.
Note:
Related Files :
carbohydrate metabolism
enzyme inhibition
Fructokinase
fructose
Lycopersicon esculentum
Starch
Sucrose metabolism
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Related Content
More details
DOI :
10.1034/j.1399-3054.1997.1010417.x
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30457
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:54
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Scientific Publication
Inhibition of fructokinase and sucrose synthase by cytosolic levels of fructose in young tomato fruit undergoing transient starch synthesis
101
Schaffer, A.A., Dept of Vegetable Crops, Volcani Center-ARO, 50250 Bet Dagan, Israel
Petreikov, M., Dept of Vegetable Crops, Volcani Center-ARO, 50250 Bet Dagan, Israel
Inhibition of fructokinase and sucrose synthase by cytosolic levels of fructose in young tomato fruit undergoing transient starch synthesis
Immature tomato fruit are characterized by a transient period of starch accumulation. Sucrose synthase (EC 2.4.1.13) and fructokinase (EC 2.7.1.4) are two of the initial enzymes in the sucrose to starch synthetic pathway. Both enzymes in tomato fruit are significantly inhibited by fructose at concentrations physiological to young tomato fruit. Compartmental analysis is immature fruit pericarp indicates that fructose is not specifically compartmentalized in the vacuole and that physiological cytosolic concentrations of fructose in young tomato fruit are above 30 mM. Such physiological levels of fructose significantly inhibit sucrose synthase cleavage activity as well as the activity of a partially purified fructokinase. These data suggest a mechanism of a coordinated, in vivo regulation of tomato sucrose synthase and fructokinase activity, which may be potentially limiting to starch accumulation in young tomato fruit.
Scientific Publication
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