Cytosolic fructose - an underestimated player in the regulation of sucrose biosynthesis

Abstract Background Plants must continuously adapt to environmental fluctuations, which significantly influence their photosynthetic performance and overall metabolism. The sucrose cycling system within plant cells plays a critical regulatory role during stress conditions. This study employed a syst...

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Main Authors: Oliver Giesbrecht, Christina Bonn, Lisa Fürtauer
Format: Article
Language:English
Published: BMC 2025-04-01
Series:BMC Plant Biology
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Online Access:https://doi.org/10.1186/s12870-025-06493-y
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author Oliver Giesbrecht
Christina Bonn
Lisa Fürtauer
author_facet Oliver Giesbrecht
Christina Bonn
Lisa Fürtauer
author_sort Oliver Giesbrecht
collection DOAJ
description Abstract Background Plants must continuously adapt to environmental fluctuations, which significantly influence their photosynthetic performance and overall metabolism. The sucrose cycling system within plant cells plays a critical regulatory role during stress conditions. This study employed a systems biology approach to analyze system stabilities mathematically under various regulatory conditions impacting sucrose cycling dynamics. We investigated the effects of mutations within this cycle, specifically HEXOKINASE1 (Arabidopsis thaliana gin2-1), alongside high-light exposure. Finally, we confirmed the modeling output in vitro by enzyme assays. Results The implementation of experimental subcellular metabolite data into a Structural Kinetic Model (SKM) enabled exploration of regulatory responses and system stabilities within a three-compartment model. Within system instabilities, gin2-1 was more instable than its wild type. The gin2-1 mutation particularly was destabilized when fructokinase function was impaired by phosphorylated sugars. Additionally, we confirmed that phosphorylated sugars serve as stronger activators of sucrose-phosphate synthase (SPS) than glucose. Interestingly, models with fructose SPS activation exhibited a similar stability pattern. Consequently, we proposed and confirmed in silico a triple activation of SPS by highly activating phosphorylated sugars and lower activating non-phosphorylated hexoses. Additionally, we biochemically confirmed the previously unknown, but now predicted, activation of SPS by fructose in vitro. Conclusion In summary, our study highlights the essential role of sucrose cycling in plant cells under stress conditions. The in silico findings reveal that phosphorylated sugars are stronger activators of SPS than glucose and introduce a previously unknown activation mechanism by fructose. These potential activation capacities were confirmed in vitro through SPS enzyme activity assays, underscoring the efficiency of our systems biology approach. Overall, this research provides valuable insights into carbohydrate metabolism regulation and paves the way for future investigations to deepen our understanding of the complexities involved in sucrose cycling and biosynthesis in plants.
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spelling doaj-art-bc4269ecb91d461c8554ef7ef631ca522025-08-20T03:14:07ZengBMCBMC Plant Biology1471-22292025-04-0125111610.1186/s12870-025-06493-yCytosolic fructose - an underestimated player in the regulation of sucrose biosynthesisOliver Giesbrecht0Christina Bonn1Lisa Fürtauer2Plant Molecular Systems Biology, Department of Biology III, RWTH Aachen UniversityPlant Molecular Systems Biology, Department of Biology III, RWTH Aachen UniversityPlant Molecular Systems Biology, Department of Biology III, RWTH Aachen UniversityAbstract Background Plants must continuously adapt to environmental fluctuations, which significantly influence their photosynthetic performance and overall metabolism. The sucrose cycling system within plant cells plays a critical regulatory role during stress conditions. This study employed a systems biology approach to analyze system stabilities mathematically under various regulatory conditions impacting sucrose cycling dynamics. We investigated the effects of mutations within this cycle, specifically HEXOKINASE1 (Arabidopsis thaliana gin2-1), alongside high-light exposure. Finally, we confirmed the modeling output in vitro by enzyme assays. Results The implementation of experimental subcellular metabolite data into a Structural Kinetic Model (SKM) enabled exploration of regulatory responses and system stabilities within a three-compartment model. Within system instabilities, gin2-1 was more instable than its wild type. The gin2-1 mutation particularly was destabilized when fructokinase function was impaired by phosphorylated sugars. Additionally, we confirmed that phosphorylated sugars serve as stronger activators of sucrose-phosphate synthase (SPS) than glucose. Interestingly, models with fructose SPS activation exhibited a similar stability pattern. Consequently, we proposed and confirmed in silico a triple activation of SPS by highly activating phosphorylated sugars and lower activating non-phosphorylated hexoses. Additionally, we biochemically confirmed the previously unknown, but now predicted, activation of SPS by fructose in vitro. Conclusion In summary, our study highlights the essential role of sucrose cycling in plant cells under stress conditions. The in silico findings reveal that phosphorylated sugars are stronger activators of SPS than glucose and introduce a previously unknown activation mechanism by fructose. These potential activation capacities were confirmed in vitro through SPS enzyme activity assays, underscoring the efficiency of our systems biology approach. Overall, this research provides valuable insights into carbohydrate metabolism regulation and paves the way for future investigations to deepen our understanding of the complexities involved in sucrose cycling and biosynthesis in plants.https://doi.org/10.1186/s12870-025-06493-yArabidopsis thalianaEnvironmental perturbationsSubcellular metabolismSucrose cyclingFructoseSKM modeling
spellingShingle Oliver Giesbrecht
Christina Bonn
Lisa Fürtauer
Cytosolic fructose - an underestimated player in the regulation of sucrose biosynthesis
BMC Plant Biology
Arabidopsis thaliana
Environmental perturbations
Subcellular metabolism
Sucrose cycling
Fructose
SKM modeling
title Cytosolic fructose - an underestimated player in the regulation of sucrose biosynthesis
title_full Cytosolic fructose - an underestimated player in the regulation of sucrose biosynthesis
title_fullStr Cytosolic fructose - an underestimated player in the regulation of sucrose biosynthesis
title_full_unstemmed Cytosolic fructose - an underestimated player in the regulation of sucrose biosynthesis
title_short Cytosolic fructose - an underestimated player in the regulation of sucrose biosynthesis
title_sort cytosolic fructose an underestimated player in the regulation of sucrose biosynthesis
topic Arabidopsis thaliana
Environmental perturbations
Subcellular metabolism
Sucrose cycling
Fructose
SKM modeling
url https://doi.org/10.1186/s12870-025-06493-y
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AT christinabonn cytosolicfructoseanunderestimatedplayerintheregulationofsucrosebiosynthesis
AT lisafurtauer cytosolicfructoseanunderestimatedplayerintheregulationofsucrosebiosynthesis