Quinone- and nitroreductase reactions of Thermotoga maritima thioredoxin reductase.
Identifieur interne : 000516 ( Main/Exploration ); précédent : 000515; suivant : 000517Quinone- and nitroreductase reactions of Thermotoga maritima thioredoxin reductase.
Auteurs : Benjaminas Valiauga [Lituanie] ; Nicolas Rouhier [France] ; Jean-Pierre Jacquot [France] ; Narimantas Nas [Lituanie]Source :
- Acta biochimica Polonica [ 1734-154X ] ; 2015.
Descripteurs français
- KwdFr :
- Catalyse (MeSH), Cinétique (MeSH), Concentration en ions d'hydrogène (MeSH), Flavine adénine dinucléotide (métabolisme), Glutarédoxines (métabolisme), NAD (métabolisme), Nitroréductases (métabolisme), Protéines bactériennes (composition chimique), Protéines bactériennes (métabolisme), Quinones (métabolisme), Sites de fixation (MeSH), Spécificité du substrat (MeSH), Thermodynamique (MeSH), Thermotoga maritima (enzymologie), Thioredoxin-disulfide reductase (composition chimique), Thioredoxin-disulfide reductase (métabolisme).
- MESH :
- composition chimique : Protéines bactériennes, Thioredoxin-disulfide reductase.
- enzymologie : Thermotoga maritima.
- métabolisme : Flavine adénine dinucléotide, Glutarédoxines, NAD, Nitroréductases, Protéines bactériennes, Quinones, Thioredoxin-disulfide reductase.
- Catalyse, Cinétique, Concentration en ions d'hydrogène, Sites de fixation, Spécificité du substrat, Thermodynamique.
English descriptors
- KwdEn :
- Bacterial Proteins (chemistry), Bacterial Proteins (metabolism), Binding Sites (MeSH), Catalysis (MeSH), Flavin-Adenine Dinucleotide (metabolism), Glutaredoxins (metabolism), Hydrogen-Ion Concentration (MeSH), Kinetics (MeSH), NAD (metabolism), Nitroreductases (metabolism), Quinones (metabolism), Substrate Specificity (MeSH), Thermodynamics (MeSH), Thermotoga maritima (enzymology), Thioredoxin-Disulfide Reductase (chemistry), Thioredoxin-Disulfide Reductase (metabolism).
- MESH :
- chemical , chemistry : Bacterial Proteins, Thioredoxin-Disulfide Reductase.
- chemical , metabolism : Bacterial Proteins, Flavin-Adenine Dinucleotide, Glutaredoxins, NAD, Nitroreductases, Quinones, Thioredoxin-Disulfide Reductase.
- enzymology : Thermotoga maritima.
- Binding Sites, Catalysis, Hydrogen-Ion Concentration, Kinetics, Substrate Specificity, Thermodynamics.
Abstract
The Thermotoga maritima NADH:thioredoxin reductase (TmTR) contains FAD and a catalytic disulfide in the active center, and uses a relatively poorly studied physiological oxidant Grx-1-type glutaredoxin. In order to further assess the redox properties of TmTR, we used series of quinoidal and nitroaromatic oxidants with a wide range of single-electron reduction potentials (E(1)7, -0.49-0.09 V). We found that TmTR catalyzed the mixed single- and two-electron reduction of quinones and nitroaromatic compounds, which was much faster than the reduction of Grx-1. The reactivity of both groups of oxidants increased with an increase in their E(1)7, thus pointing to the absence of their structural specificity. The maximal rates of quinone reduction in the steady-state reactions were lower than the maximal rates of reduction of FAD by NADH, obtained in presteady-state experiments. The mixed-type reaction inhibition by NAD(+) was consistent with its competition for a NADH binding site in the oxidized enzyme form, and also with the reoxidation of the reduced enzyme form. The inhibition data yielded a value of the standard potential for TmTR of -0.31±0.03 V at pH 7.0, which may correspond to the FAD/FADH2 redox couple. Overall, the mechanism of quinone- and nitroreductase reactions of T. maritima TR was similar to the previously described mechanism of Arabidopsis thaliana TR, and points to their prooxidant and possibly cytotoxic role.
DOI: 10.18388/abp.2015_1003
PubMed: 26098718
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Binding Sites (MeSH)</term>
<term>Catalysis (MeSH)</term>
<term>Flavin-Adenine Dinucleotide (metabolism)</term>
<term>Glutaredoxins (metabolism)</term>
<term>Hydrogen-Ion Concentration (MeSH)</term>
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<term>Thioredoxin-disulfide reductase (métabolisme)</term>
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<term>Glutaredoxins</term>
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<front><div type="abstract" xml:lang="en">The Thermotoga maritima NADH:thioredoxin reductase (TmTR) contains FAD and a catalytic disulfide in the active center, and uses a relatively poorly studied physiological oxidant Grx-1-type glutaredoxin. In order to further assess the redox properties of TmTR, we used series of quinoidal and nitroaromatic oxidants with a wide range of single-electron reduction potentials (E(1)7, -0.49-0.09 V). We found that TmTR catalyzed the mixed single- and two-electron reduction of quinones and nitroaromatic compounds, which was much faster than the reduction of Grx-1. The reactivity of both groups of oxidants increased with an increase in their E(1)7, thus pointing to the absence of their structural specificity. The maximal rates of quinone reduction in the steady-state reactions were lower than the maximal rates of reduction of FAD by NADH, obtained in presteady-state experiments. The mixed-type reaction inhibition by NAD(+) was consistent with its competition for a NADH binding site in the oxidized enzyme form, and also with the reoxidation of the reduced enzyme form. The inhibition data yielded a value of the standard potential for TmTR of -0.31±0.03 V at pH 7.0, which may correspond to the FAD/FADH2 redox couple. Overall, the mechanism of quinone- and nitroreductase reactions of T. maritima TR was similar to the previously described mechanism of Arabidopsis thaliana TR, and points to their prooxidant and possibly cytotoxic role. </div>
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<Abstract><AbstractText>The Thermotoga maritima NADH:thioredoxin reductase (TmTR) contains FAD and a catalytic disulfide in the active center, and uses a relatively poorly studied physiological oxidant Grx-1-type glutaredoxin. In order to further assess the redox properties of TmTR, we used series of quinoidal and nitroaromatic oxidants with a wide range of single-electron reduction potentials (E(1)7, -0.49-0.09 V). We found that TmTR catalyzed the mixed single- and two-electron reduction of quinones and nitroaromatic compounds, which was much faster than the reduction of Grx-1. The reactivity of both groups of oxidants increased with an increase in their E(1)7, thus pointing to the absence of their structural specificity. The maximal rates of quinone reduction in the steady-state reactions were lower than the maximal rates of reduction of FAD by NADH, obtained in presteady-state experiments. The mixed-type reaction inhibition by NAD(+) was consistent with its competition for a NADH binding site in the oxidized enzyme form, and also with the reoxidation of the reduced enzyme form. The inhibition data yielded a value of the standard potential for TmTR of -0.31±0.03 V at pH 7.0, which may correspond to the FAD/FADH2 redox couple. Overall, the mechanism of quinone- and nitroreductase reactions of T. maritima TR was similar to the previously described mechanism of Arabidopsis thaliana TR, and points to their prooxidant and possibly cytotoxic role. </AbstractText>
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<li>Lituanie</li>
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<region><li>Grand Est</li>
<li>Lorraine (région)</li>
</region>
<settlement><li>Champenoux</li>
</settlement>
<orgName><li>Université de Lorraine</li>
</orgName>
</list>
<tree><country name="Lituanie"><noRegion><name sortKey="Valiauga, Benjaminas" sort="Valiauga, Benjaminas" uniqKey="Valiauga B" first="Benjaminas" last="Valiauga">Benjaminas Valiauga</name>
</noRegion>
<name sortKey=" Nas, Narimantas" sort=" Nas, Narimantas" uniqKey=" Nas N" first="Narimantas" last=" Nas">Narimantas Nas</name>
</country>
<country name="France"><region name="Grand Est"><name sortKey="Rouhier, Nicolas" sort="Rouhier, Nicolas" uniqKey="Rouhier N" first="Nicolas" last="Rouhier">Nicolas Rouhier</name>
</region>
<name sortKey="Jacquot, Jean Pierre" sort="Jacquot, Jean Pierre" uniqKey="Jacquot J" first="Jean-Pierre" last="Jacquot">Jean-Pierre Jacquot</name>
</country>
</tree>
</affiliations>
</record>
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