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Regulation of NADP-malate dehydrogenase in C4 plants: Relationship among enzyme activity, NADPH to NADP ratios, and thioredoxin redox states in intact maize mesophyll chloroplasts

Identifieur interne : 002E18 ( Istex/Checkpoint ); précédent : 002E17; suivant : 002E19

Regulation of NADP-malate dehydrogenase in C4 plants: Relationship among enzyme activity, NADPH to NADP ratios, and thioredoxin redox states in intact maize mesophyll chloroplasts

Auteurs : F. Rebeille [France] ; M. D. Hatch [Australie]

Source :

Archives of Biochemistry and Biophysics [ 0003-9861 ] ; 1986.

RBID : ISTEX:90E866557803B321AE5B1B97A60F5B24F7952018

Descripteurs français

Wicri :
- topic : Maïs.

English descriptors

KwdEn :
- Chloroplast, Dehydrogenase, Dhap, Electron flux, Enzyme activity, Ferredoxin, Final concentrations, Intact chloroplasts, Light intensity, Maize, Mesophyll, Mesophyll chloroplasts, Nadp, Nadp ratio, Nadph, Nadph concentration, Nadpmdh, Oxidized, Oxidized thioredoxin, Photosynthesis, Photosynthetic metabolites, Redox, Redox state, Reduceable, Reduceable substrates, Thioredoxin, Thioredoxin content, Thioredoxin redox state, Total amount.
Teeft :
- Chloroplast, Dehydrogenase, Dhap, Electron flux, Enzyme activity, Ferredoxin, Final concentrations, Intact chloroplasts, Light intensity, Maize, Mesophyll, Mesophyll chloroplasts, Nadp, Nadp ratio, Nadph, Nadph concentration, Nadpmdh, Oxidized, Oxidized thioredoxin, Photosynthesis, Photosynthetic metabolites, Redox, Redox state, Reduceable, Reduceable substrates, Thioredoxin, Thioredoxin content, Thioredoxin redox state, Total amount.

Abstract

Abstract: NADP-malate dehydrogenase activity, the ratio of NADPH to NADP, and thioredoxin redox state in Zea mays chloroplasts were determined after various treatments. Following transfer from dark to light, NADP-malate dehydrogenase was activated more than 20-fold within 10 min while the proportion of pyridine nucleotide as NADPH increased from about 25 to 90%, and the proportion of thioredoxin in the reduced form increased from 20 to more than 90%, in less than 1 min. After transfer back to the dark, NADPH levels dropped very rapidly to the initial values recorded before illumination, while enzyme activity and reduced thioredoxin levels decreased more slowly. Addition of oxaloacetate or 3-phosphoglyerate to illuminated chloroplasts results in a decrease of about 70% in the activity of NADP-malate dehydrogenase, a 30% decrease in the level of NADPH, and a 25% decrease in the reduced thioredoxin content. Adding dihydroxyacetone phosphate and pyruvate had no effect. These results are considered in relation to the hypothesis that NADP-malate dehydrogenase activity in chloroplasts may be determined by factors regulating the ratio of NADPH to NADP as well as those influencing the redox state of thioredoxin.

Url:

https://api.istex.fr/document/90E866557803B321AE5B1B97A60F5B24F7952018/fulltext/pdf

DOI: 10.1016/0003-9861(86)90572-2

Affiliations:

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Le document en format XML

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<sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Regulation of NADP-malate dehydrogenase in C4 plants: Relationship among enzyme activity, NADPH to NADP ratios, and thioredoxin redox states in intact maize mesophyll chloroplasts</title>
<author><name sortKey="Rebeille, F" sort="Rebeille, F" uniqKey="Rebeille F" first="F." last="Rebeille">F. Rebeille</name>
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<term>Electron flux</term>
<term>Enzyme activity</term>
<term>Ferredoxin</term>
<term>Final concentrations</term>
<term>Intact chloroplasts</term>
<term>Light intensity</term>
<term>Maize</term>
<term>Mesophyll</term>
<term>Mesophyll chloroplasts</term>
<term>Nadp</term>
<term>Nadp ratio</term>
<term>Nadph</term>
<term>Nadph concentration</term>
<term>Nadpmdh</term>
<term>Oxidized</term>
<term>Oxidized thioredoxin</term>
<term>Photosynthesis</term>
<term>Photosynthetic metabolites</term>
<term>Redox</term>
<term>Redox state</term>
<term>Reduceable</term>
<term>Reduceable substrates</term>
<term>Thioredoxin</term>
<term>Thioredoxin content</term>
<term>Thioredoxin redox state</term>
<term>Total amount</term>
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<term>Enzyme activity</term>
<term>Ferredoxin</term>
<term>Final concentrations</term>
<term>Intact chloroplasts</term>
<term>Light intensity</term>
<term>Maize</term>
<term>Mesophyll</term>
<term>Mesophyll chloroplasts</term>
<term>Nadp</term>
<term>Nadp ratio</term>
<term>Nadph</term>
<term>Nadph concentration</term>
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<term>Oxidized thioredoxin</term>
<term>Photosynthesis</term>
<term>Photosynthetic metabolites</term>
<term>Redox</term>
<term>Redox state</term>
<term>Reduceable</term>
<term>Reduceable substrates</term>
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<term>Thioredoxin content</term>
<term>Thioredoxin redox state</term>
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<front><div type="abstract" xml:lang="en">Abstract: NADP-malate dehydrogenase activity, the ratio of NADPH to NADP, and thioredoxin redox state in Zea mays chloroplasts were determined after various treatments. Following transfer from dark to light, NADP-malate dehydrogenase was activated more than 20-fold within 10 min while the proportion of pyridine nucleotide as NADPH increased from about 25 to 90%, and the proportion of thioredoxin in the reduced form increased from 20 to more than 90%, in less than 1 min. After transfer back to the dark, NADPH levels dropped very rapidly to the initial values recorded before illumination, while enzyme activity and reduced thioredoxin levels decreased more slowly. Addition of oxaloacetate or 3-phosphoglyerate to illuminated chloroplasts results in a decrease of about 70% in the activity of NADP-malate dehydrogenase, a 30% decrease in the level of NADPH, and a 25% decrease in the reduced thioredoxin content. Adding dihydroxyacetone phosphate and pyruvate had no effect. These results are considered in relation to the hypothesis that NADP-malate dehydrogenase activity in chloroplasts may be determined by factors regulating the ratio of NADPH to NADP as well as those influencing the redox state of thioredoxin.</div>
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Regulation of NADP-malate dehydrogenase in C4 plants: Relationship among enzyme activity, NADPH to NADP ratios, and thioredoxin redox states in intact maize mesophyll chloroplasts

Regulation of NADP-malate dehydrogenase in C4 plants: Relationship among enzyme activity, NADPH to NADP ratios, and thioredoxin redox states in intact maize mesophyll chloroplasts

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri