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Insights into ascorbate regeneration in plants: investigating the redox and structural properties of dehydroascorbate reductases from Populus trichocarpa.

Identifieur interne : 001810 ( Main/Exploration ); précédent : 001809; suivant : 001811

Insights into ascorbate regeneration in plants: investigating the redox and structural properties of dehydroascorbate reductases from Populus trichocarpa.

Auteurs : Pierre-Alexandre Lallement [France] ; Thomas Roret [France] ; Pascale Tsan [France] ; José M. Gualberto [France] ; Jean-Michel Girardet [France] ; Claude Didierjean [France] ; Nicolas Rouhier [France] ; Arnaud Hecker [France]

Source :

RBID : pubmed:26699905

Descripteurs français

English descriptors

Abstract

Dehydroascorbate reductases (DHARs), enzymes belonging to the GST superfamily, catalyse the GSH-dependent reduction of dehydroascorbate into ascorbate in plants. By maintaining a reduced ascorbate pool, they notably participate to H2O2 detoxification catalysed by ascorbate peroxidases (APXs). Despite this central role, the catalytic mechanism used by DHARs is still not well understood and there is no supportive 3D structure. In this context, we have performed a thorough biochemical and structural analysis of the three poplar DHARs and coupled this to the analysis of their transcript expression patterns and subcellular localizations. The transcripts for these genes are mainly detected in reproductive and green organs and the corresponding proteins are expressed in plastids, in the cytosol and in the nucleus, but not in mitochondria and peroxisomes where ascorbate regeneration is obviously necessary. Comparing the kinetic properties and the sensitivity to GSSG-mediated oxidation of DHAR2 and DHAR3A, exhibiting 1 or 3 cysteinyl residues respectively, we observed that the presence of additional cysteines in DHAR3A modifies the regeneration mechanism of the catalytic cysteine by forming different redox states. Finally, from the 3D structure of DHAR3A solved by NMR, we were able to map the residues important for the binding of both substrates (GSH and DHA), showing that DHAR active site is very selective for DHA recognition and providing further insights into the catalytic mechanism and the roles of the additional cysteines found in some DHARs.

DOI: 10.1042/BJ20151147
PubMed: 26699905


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<term>Ascorbic Acid (metabolism)</term>
<term>Binding Sites (MeSH)</term>
<term>Gene Expression Regulation, Enzymologic (physiology)</term>
<term>Gene Expression Regulation, Plant (physiology)</term>
<term>Magnetic Resonance Spectroscopy (MeSH)</term>
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<term>Régulation de l'expression des gènes végétaux</term>
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<div type="abstract" xml:lang="en">Dehydroascorbate reductases (DHARs), enzymes belonging to the GST superfamily, catalyse the GSH-dependent reduction of dehydroascorbate into ascorbate in plants. By maintaining a reduced ascorbate pool, they notably participate to H2O2 detoxification catalysed by ascorbate peroxidases (APXs). Despite this central role, the catalytic mechanism used by DHARs is still not well understood and there is no supportive 3D structure. In this context, we have performed a thorough biochemical and structural analysis of the three poplar DHARs and coupled this to the analysis of their transcript expression patterns and subcellular localizations. The transcripts for these genes are mainly detected in reproductive and green organs and the corresponding proteins are expressed in plastids, in the cytosol and in the nucleus, but not in mitochondria and peroxisomes where ascorbate regeneration is obviously necessary. Comparing the kinetic properties and the sensitivity to GSSG-mediated oxidation of DHAR2 and DHAR3A, exhibiting 1 or 3 cysteinyl residues respectively, we observed that the presence of additional cysteines in DHAR3A modifies the regeneration mechanism of the catalytic cysteine by forming different redox states. Finally, from the 3D structure of DHAR3A solved by NMR, we were able to map the residues important for the binding of both substrates (GSH and DHA), showing that DHAR active site is very selective for DHA recognition and providing further insights into the catalytic mechanism and the roles of the additional cysteines found in some DHARs. </div>
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<Year>2016</Year>
<Month>08</Month>
<Day>08</Day>
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<ISSN IssnType="Electronic">1470-8728</ISSN>
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<Issue>6</Issue>
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<Month>Mar</Month>
<Day>15</Day>
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<Title>The Biochemical journal</Title>
<ISOAbbreviation>Biochem J</ISOAbbreviation>
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<ArticleTitle>Insights into ascorbate regeneration in plants: investigating the redox and structural properties of dehydroascorbate reductases from Populus trichocarpa.</ArticleTitle>
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<AbstractText>Dehydroascorbate reductases (DHARs), enzymes belonging to the GST superfamily, catalyse the GSH-dependent reduction of dehydroascorbate into ascorbate in plants. By maintaining a reduced ascorbate pool, they notably participate to H2O2 detoxification catalysed by ascorbate peroxidases (APXs). Despite this central role, the catalytic mechanism used by DHARs is still not well understood and there is no supportive 3D structure. In this context, we have performed a thorough biochemical and structural analysis of the three poplar DHARs and coupled this to the analysis of their transcript expression patterns and subcellular localizations. The transcripts for these genes are mainly detected in reproductive and green organs and the corresponding proteins are expressed in plastids, in the cytosol and in the nucleus, but not in mitochondria and peroxisomes where ascorbate regeneration is obviously necessary. Comparing the kinetic properties and the sensitivity to GSSG-mediated oxidation of DHAR2 and DHAR3A, exhibiting 1 or 3 cysteinyl residues respectively, we observed that the presence of additional cysteines in DHAR3A modifies the regeneration mechanism of the catalytic cysteine by forming different redox states. Finally, from the 3D structure of DHAR3A solved by NMR, we were able to map the residues important for the binding of both substrates (GSH and DHA), showing that DHAR active site is very selective for DHA recognition and providing further insights into the catalytic mechanism and the roles of the additional cysteines found in some DHARs. </AbstractText>
<CopyrightInformation>© 2016 Authors; published by Portland Press Limited.</CopyrightInformation>
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<LastName>Lallement</LastName>
<ForeName>Pierre-Alexandre</ForeName>
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<ForeName>Pascale</ForeName>
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<Affiliation>Université de Lorraine, CRM2, UMR 7036, 54506 Vandœuvre-lès-Nancy, France CNRS, CRM2, UMR 7036, 54506 Vandœuvre-lès-Nancy, France.</Affiliation>
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<Year>2015</Year>
<Month>12</Month>
<Day>23</Day>
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<Country>England</Country>
<MedlineTA>Biochem J</MedlineTA>
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<ISSNLinking>0264-6021</ISSNLinking>
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<Chemical>
<RegistryNumber>0</RegistryNumber>
<NameOfSubstance UI="D010940">Plant Proteins</NameOfSubstance>
</Chemical>
<Chemical>
<RegistryNumber>EC 1.-</RegistryNumber>
<NameOfSubstance UI="D010088">Oxidoreductases</NameOfSubstance>
</Chemical>
<Chemical>
<RegistryNumber>EC 1.8.5.1</RegistryNumber>
<NameOfSubstance UI="C020666">glutathione dehydrogenase (ascorbate)</NameOfSubstance>
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<Chemical>
<RegistryNumber>PQ6CK8PD0R</RegistryNumber>
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<DescriptorName UI="D001205" MajorTopicYN="N">Ascorbic Acid</DescriptorName>
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