Cited by 79Photosynthetic Processes and MechanismsPlant nutrient uptake and metabolismPlant biochemistry and biosynthesis

Flux Control of the Malate Valve in Leaf Cells

Fridlyand, Leonid E., Backhausen, Jan E., Scheibe, Renate·1998·Archives of Biochemistry and Biophysics

Abstract

The coupled processes of the chloroplast trans-envelope transport of malate and oxaloacetate and their interconversion as catalyzed by the stromal NADP-linked malate dehydrogenase are quantitatively analyzed by means of a steady-state model. The equation for the NADP-malate dehydrogenase reaction is developed. The empirical dependence of enzyme activity on NADPH and NADP+ is used to determine its actual activity. The trans-envelope counter exchange of malate and oxaloacetate is described by a kinetic model of the translocator. Kinetic parameters are derived from known data, except for the Km value and the maximum rate for oxaloacetate transport, which are estimated from oxaloacetate-dependent malate formation in isolated intact chloroplasts. Using the kinetic properties of the system and the known metabolite concentrations, the model demonstrates that photosynthetically generated NADPH can be exported efficiently from the chloroplasts to the cytosol by the malate-valve system. The transfer capacity of the malate valve is estimated not to exceed 20 mumol (mg Chl)-1 h-1 (or 5% of the electron transport) under normal physiological conditions. The possible role of the malate valve in leaf cells under normal conditions and during stress is discussed.

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Registry

Crossref · 10.1006/abbi.1997.0482

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  • The flux of the chloroplast malate valve (1.81 μmol m−2 s−1) exceeded the upper flux limit of 0.75 μmol m−2 s−1 estimated by kinetic modeling.

    “However, the flux of the chloroplast malate valve (1.81 μmol m−2 s−1) exceeded the upper flux limit of 0.75 μmol m−2 s−1 estimated by kinetic modeling (Fridlyand et al., 1998).”

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Authors
Fridlyand, L. E., Backhausen, J. E., & Scheibe, R.
Affiliations
  • National Academy of Sciences of Belarus (BY)
  • Osnabrück University (DE)
Corresponding author
Scheibe, Renate
Venue
Archives of Biochemistry and Biophysics
Publisher
Elsevier BV
Published
1998-01
Volume
349
Issue
2
Pages
290-298
ISSN
0003-9861 (ISSN-L)
OpenAlex
W2088174162
Cited by
79
References
37
Citations by year
2025: 2 · 2024: 1 · 2022: 1 · 2021: 2 · 2020: 6 · 2019: 3 · 2018: 3 · 2017: 5 · 2016: 1 · 2015: 3 · 2014: 3 · 2012: 7
FWCI
0.82
Type
journal article
Language
en
Open access
closed
Locations
  • Archives of Biochemistry and Biophysics (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant biochemistry and biosynthesis
Keywords
oxaloacetate, NADPH/NADP+ ratio, enzyme kinetics, malate transport, leaf cells, photosynthesis, stress response
MeSH terms
Chloroplasts, Homeostasis, Kinetics, Malate Dehydrogenase, Malates, Models, Chemical, NADP, Oxaloacetates, Oxidation-Reduction, Photosynthesis, Plant Leaves, Malate Dehydrogenase (NADP+)

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