Extraordinary μs-ms backbone dynamics in Arabidopsis thaliana peroxiredoxin Q.
Identifieur interne : 000948 ( Main/Exploration ); précédent : 000947; suivant : 000949Extraordinary μs-ms backbone dynamics in Arabidopsis thaliana peroxiredoxin Q.
Auteurs : Jörgen Adén [Suède] ; Marcus Wallgren ; Patrik Storm ; Christoph F. Weise ; Alexander Christiansen ; Wolfgang P. Schröder ; Christiane Funk ; Magnus Wolf-WatzSource :
- Biochimica et biophysica acta [ 0006-3002 ] ; 2011.
Descripteurs français
- KwdFr :
- Arabidopsis (composition chimique), Arabidopsis (enzymologie), Arabidopsis (métabolisme), Modèles moléculaires (MeSH), Oxydoréduction (MeSH), Peroxirédoxines (analyse), Peroxirédoxines (composition chimique), Peroxirédoxines (isolement et purification), Peroxirédoxines (métabolisme), Pliage des protéines (MeSH), Protéines d'Arabidopsis (analyse), Protéines d'Arabidopsis (composition chimique), Protéines d'Arabidopsis (isolement et purification), Protéines d'Arabidopsis (métabolisme), Résonance magnétique nucléaire biomoléculaire (MeSH), Simulation de dynamique moléculaire (MeSH), Stabilité protéique (MeSH), Structure secondaire des protéines (MeSH), Séquence d'acides aminés (MeSH), Température (MeSH), Thermodynamique (MeSH).
- MESH :
- analyse : Peroxirédoxines, Protéines d'Arabidopsis.
- composition chimique : Arabidopsis, Peroxirédoxines, Protéines d'Arabidopsis.
- enzymologie : Arabidopsis.
- isolement et purification : Peroxirédoxines, Protéines d'Arabidopsis.
- métabolisme : Arabidopsis, Peroxirédoxines, Protéines d'Arabidopsis.
- Modèles moléculaires, Oxydoréduction, Pliage des protéines, Résonance magnétique nucléaire biomoléculaire, Simulation de dynamique moléculaire, Stabilité protéique, Structure secondaire des protéines, Séquence d'acides aminés, Température, Thermodynamique.
English descriptors
- KwdEn :
- Amino Acid Sequence (MeSH), Arabidopsis (chemistry), Arabidopsis (enzymology), Arabidopsis (metabolism), Arabidopsis Proteins (analysis), Arabidopsis Proteins (chemistry), Arabidopsis Proteins (isolation & purification), Arabidopsis Proteins (metabolism), Models, Molecular (MeSH), Molecular Dynamics Simulation (MeSH), Nuclear Magnetic Resonance, Biomolecular (MeSH), Oxidation-Reduction (MeSH), Peroxiredoxins (analysis), Peroxiredoxins (chemistry), Peroxiredoxins (isolation & purification), Peroxiredoxins (metabolism), Protein Folding (MeSH), Protein Stability (MeSH), Protein Structure, Secondary (MeSH), Temperature (MeSH), Thermodynamics (MeSH).
- MESH :
- chemical , analysis : Arabidopsis Proteins, Peroxiredoxins.
- chemistry : Arabidopsis, Arabidopsis Proteins, Peroxiredoxins.
- enzymology : Arabidopsis.
- chemical , isolation & purification : Arabidopsis Proteins, Peroxiredoxins.
- metabolism : Arabidopsis, Arabidopsis Proteins, Peroxiredoxins.
- Amino Acid Sequence, Models, Molecular, Molecular Dynamics Simulation, Nuclear Magnetic Resonance, Biomolecular, Oxidation-Reduction, Protein Folding, Protein Stability, Protein Structure, Secondary, Temperature, Thermodynamics.
Abstract
Peroxiredoxin Q (PrxQ) isolated from Arabidopsis thaliana belongs to a family of redox enzymes called peroxiredoxins, which are thioredoxin- or glutaredoxin-dependent peroxidases acting to reduce peroxides and in particular hydrogen peroxide. PrxQ cycles between an active reduced state and an inactive oxidized state during its catalytic cycle. The catalytic mechanism involves a nucleophilic attack of the catalytic cysteine on hydrogen peroxide to generate a sulfonic acid intermediate with a concerted release of a water molecule. This intermediate is subsequently relaxed by the reaction of a second cysteine, denoted the resolving cysteine, generating an intramolecular disulfide bond and release of a second water molecule. PrxQ is recycled to the active state by a thioredoxin-dependent reduction. Previous structural studies of PrxQ homologues have provided the structural basis for the switch between reduced and oxidized conformations. Here, we have performed a detailed study of the activity, structure and dynamics of PrxQ in both the oxidized and reduced states. Reliable and experimentally validated structural models of PrxQ in both oxidation states were generated using homology based modeling. Analysis of NMR spin relaxation rates shows that PrxQ is monomeric in both oxidized and reduced states. As evident from R(2) relaxation rates the reduced form of PrxQ undergoes unprecedented dynamics on the slow μs-ms timescale. The ground state of this conformational dynamics is likely the stably folded reduced state as implied by circular dichroism spectroscopy. We speculate that the extensive dynamics is intimately related to the catalytic function of PrxQ.
DOI: 10.1016/j.bbapap.2011.07.011
PubMed: 21798375
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Arabidopsis (enzymology)</term>
<term>Arabidopsis (metabolism)</term>
<term>Arabidopsis Proteins (analysis)</term>
<term>Arabidopsis Proteins (chemistry)</term>
<term>Arabidopsis Proteins (isolation & purification)</term>
<term>Arabidopsis Proteins (metabolism)</term>
<term>Models, Molecular (MeSH)</term>
<term>Molecular Dynamics Simulation (MeSH)</term>
<term>Nuclear Magnetic Resonance, Biomolecular (MeSH)</term>
<term>Oxidation-Reduction (MeSH)</term>
<term>Peroxiredoxins (analysis)</term>
<term>Peroxiredoxins (chemistry)</term>
<term>Peroxiredoxins (isolation & purification)</term>
<term>Peroxiredoxins (metabolism)</term>
<term>Protein Folding (MeSH)</term>
<term>Protein Stability (MeSH)</term>
<term>Protein Structure, Secondary (MeSH)</term>
<term>Temperature (MeSH)</term>
<term>Thermodynamics (MeSH)</term>
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<term>Arabidopsis (enzymologie)</term>
<term>Arabidopsis (métabolisme)</term>
<term>Modèles moléculaires (MeSH)</term>
<term>Oxydoréduction (MeSH)</term>
<term>Peroxirédoxines (analyse)</term>
<term>Peroxirédoxines (composition chimique)</term>
<term>Peroxirédoxines (isolement et purification)</term>
<term>Peroxirédoxines (métabolisme)</term>
<term>Pliage des protéines (MeSH)</term>
<term>Protéines d'Arabidopsis (analyse)</term>
<term>Protéines d'Arabidopsis (composition chimique)</term>
<term>Protéines d'Arabidopsis (isolement et purification)</term>
<term>Protéines d'Arabidopsis (métabolisme)</term>
<term>Résonance magnétique nucléaire biomoléculaire (MeSH)</term>
<term>Simulation de dynamique moléculaire (MeSH)</term>
<term>Stabilité protéique (MeSH)</term>
<term>Structure secondaire des protéines (MeSH)</term>
<term>Séquence d'acides aminés (MeSH)</term>
<term>Température (MeSH)</term>
<term>Thermodynamique (MeSH)</term>
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<keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Arabidopsis Proteins</term>
<term>Peroxiredoxins</term>
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<term>Protéines d'Arabidopsis</term>
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<term>Arabidopsis Proteins</term>
<term>Peroxiredoxins</term>
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<term>Protéines d'Arabidopsis</term>
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<term>Peroxiredoxins</term>
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<term>Models, Molecular</term>
<term>Molecular Dynamics Simulation</term>
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<term>Temperature</term>
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<term>Résonance magnétique nucléaire biomoléculaire</term>
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<term>Stabilité protéique</term>
<term>Structure secondaire des protéines</term>
<term>Séquence d'acides aminés</term>
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<front><div type="abstract" xml:lang="en">Peroxiredoxin Q (PrxQ) isolated from Arabidopsis thaliana belongs to a family of redox enzymes called peroxiredoxins, which are thioredoxin- or glutaredoxin-dependent peroxidases acting to reduce peroxides and in particular hydrogen peroxide. PrxQ cycles between an active reduced state and an inactive oxidized state during its catalytic cycle. The catalytic mechanism involves a nucleophilic attack of the catalytic cysteine on hydrogen peroxide to generate a sulfonic acid intermediate with a concerted release of a water molecule. This intermediate is subsequently relaxed by the reaction of a second cysteine, denoted the resolving cysteine, generating an intramolecular disulfide bond and release of a second water molecule. PrxQ is recycled to the active state by a thioredoxin-dependent reduction. Previous structural studies of PrxQ homologues have provided the structural basis for the switch between reduced and oxidized conformations. Here, we have performed a detailed study of the activity, structure and dynamics of PrxQ in both the oxidized and reduced states. Reliable and experimentally validated structural models of PrxQ in both oxidation states were generated using homology based modeling. Analysis of NMR spin relaxation rates shows that PrxQ is monomeric in both oxidized and reduced states. As evident from R(2) relaxation rates the reduced form of PrxQ undergoes unprecedented dynamics on the slow μs-ms timescale. The ground state of this conformational dynamics is likely the stably folded reduced state as implied by circular dichroism spectroscopy. We speculate that the extensive dynamics is intimately related to the catalytic function of PrxQ.</div>
</front>
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<Abstract><AbstractText>Peroxiredoxin Q (PrxQ) isolated from Arabidopsis thaliana belongs to a family of redox enzymes called peroxiredoxins, which are thioredoxin- or glutaredoxin-dependent peroxidases acting to reduce peroxides and in particular hydrogen peroxide. PrxQ cycles between an active reduced state and an inactive oxidized state during its catalytic cycle. The catalytic mechanism involves a nucleophilic attack of the catalytic cysteine on hydrogen peroxide to generate a sulfonic acid intermediate with a concerted release of a water molecule. This intermediate is subsequently relaxed by the reaction of a second cysteine, denoted the resolving cysteine, generating an intramolecular disulfide bond and release of a second water molecule. PrxQ is recycled to the active state by a thioredoxin-dependent reduction. Previous structural studies of PrxQ homologues have provided the structural basis for the switch between reduced and oxidized conformations. Here, we have performed a detailed study of the activity, structure and dynamics of PrxQ in both the oxidized and reduced states. Reliable and experimentally validated structural models of PrxQ in both oxidation states were generated using homology based modeling. Analysis of NMR spin relaxation rates shows that PrxQ is monomeric in both oxidized and reduced states. As evident from R(2) relaxation rates the reduced form of PrxQ undergoes unprecedented dynamics on the slow μs-ms timescale. The ground state of this conformational dynamics is likely the stably folded reduced state as implied by circular dichroism spectroscopy. We speculate that the extensive dynamics is intimately related to the catalytic function of PrxQ.</AbstractText>
<CopyrightInformation>Copyright © 2011 Elsevier B.V. All rights reserved.</CopyrightInformation>
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<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Adén</LastName>
<ForeName>Jörgen</ForeName>
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<Author ValidYN="Y"><LastName>Weise</LastName>
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