PoplarV1, Main, Exploration, bibRecord, 003542

Oxidation of oxymyoglobin by poplar plastocyanins a and b.

Identifieur interne : 003542 ( Main/Exploration ); précédent : 003541; suivant : 003543

Oxidation of oxymyoglobin by poplar plastocyanins a and b.

Auteurs : Petya K. Christova [Bulgarie] ; Anthony A. Donchev ; Alexandra Ch Shosheva ; Vladimir I. Getov ; Mitko I. Dimitrov

Source :

Indian journal of biochemistry & biophysics [ 0301-1208 ] ; 2009.

RBID : pubmed:20027868

Descripteurs français

KwdFr :
- Animaux (MeSH), Cinétique (MeSH), Concentration en ions d'hydrogène (MeSH), Concentration osmolaire (MeSH), Myoglobine (métabolisme), Plastocyanine (métabolisme), Populus (MeSH), Transport d'électrons (MeSH).
MESH :
- métabolisme : Myoglobine, Plastocyanine.
- Animaux, Cinétique, Concentration en ions d'hydrogène, Concentration osmolaire, Populus, Transport d'électrons.

English descriptors

KwdEn :
- Animals (MeSH), Electron Transport (MeSH), Hydrogen-Ion Concentration (MeSH), Kinetics (MeSH), Myoglobin (metabolism), Osmolar Concentration (MeSH), Plastocyanin (metabolism), Populus (MeSH).
MESH :
- chemical , metabolism : Myoglobin, Plastocyanin.
- Animals, Electron Transport, Hydrogen-Ion Concentration, Kinetics, Osmolar Concentration, Populus.

Abstract

Oxidation of oxymyoglobin [MbO2(Fe2+)] by isoplastocyanins a (PCa) and b (PCb) was experimentally investigated and the corresponding redox reaction was modeled using the physicochemical parameters of the isoforms to study the effect of the dimorphism. The kinetic curve of oxidation of MbO2 (Fe2+) by oxidized PCa [PCa(Cu2+)] and PCb [PCb(Cu2+)] and the pH-dependence of the rate constant kI were determined. In the range of pH 4.8-9.0, PCb reacts with higher k1, compared with PCa. For example, at pH 7.0, k1(PCb) = 4 x 10(2) M(-1)s(-1), whereas k1(PCa)= 2 x 10(2) M(-1)S(-1). The observed values of deltaE(0) for the reaction pairs Mb-PCa and Mb-PCb were -304 mV and -319 mV, respectively. The effect of the ionic strength (mu) on the rate of the electron transfer was also studied. It was found that: (i) the net charge Z1 of PCa and PCb fully corresponds to that calculated by their primary structures and Z2 of Mb corresponds to that calculated by its titration curve; (ii) the In k as function of mean square of mu was similar for both PCa and PCb; (iii) the curve of the reaction PCb <----(e(-1)) Mb (pH 7.0) wasshifted towards higher values of k, in agreement with the larger net negative charge of PCb; and (iv) the character of the electrostatic interactions remained unchanged by a replacement of PCa by PCb and by the change of pH from 7.0 to 4.8.

PubMed: 20027868

Affiliations:

Bulgarie

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Le document en format XML

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<author><name sortKey="Christova, Petya K" sort="Christova, Petya K" uniqKey="Christova P" first="Petya K" last="Christova">Petya K. Christova</name>
<affiliation wicri:level="1"><nlm:affiliation>Institute of Organic Chemistry, Bulgarian Academy of Sciences, Sofia-1113, Bulgaria.</nlm:affiliation>
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<author><name sortKey="Donchev, Anthony A" sort="Donchev, Anthony A" uniqKey="Donchev A" first="Anthony A" last="Donchev">Anthony A. Donchev</name>
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<author><name sortKey="Shosheva, Alexandra Ch" sort="Shosheva, Alexandra Ch" uniqKey="Shosheva A" first="Alexandra Ch" last="Shosheva">Alexandra Ch Shosheva</name>
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<author><name sortKey="Dimitrov, Mitko I" sort="Dimitrov, Mitko I" uniqKey="Dimitrov M" first="Mitko I" last="Dimitrov">Mitko I. Dimitrov</name>
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<author><name sortKey="Christova, Petya K" sort="Christova, Petya K" uniqKey="Christova P" first="Petya K" last="Christova">Petya K. Christova</name>
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<author><name sortKey="Shosheva, Alexandra Ch" sort="Shosheva, Alexandra Ch" uniqKey="Shosheva A" first="Alexandra Ch" last="Shosheva">Alexandra Ch Shosheva</name>
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<term>Electron Transport (MeSH)</term>
<term>Hydrogen-Ion Concentration (MeSH)</term>
<term>Kinetics (MeSH)</term>
<term>Myoglobin (metabolism)</term>
<term>Osmolar Concentration (MeSH)</term>
<term>Plastocyanin (metabolism)</term>
<term>Populus (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Animaux (MeSH)</term>
<term>Cinétique (MeSH)</term>
<term>Concentration en ions d'hydrogène (MeSH)</term>
<term>Concentration osmolaire (MeSH)</term>
<term>Myoglobine (métabolisme)</term>
<term>Plastocyanine (métabolisme)</term>
<term>Populus (MeSH)</term>
<term>Transport d'électrons (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Myoglobin</term>
<term>Plastocyanin</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Myoglobine</term>
<term>Plastocyanine</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Animals</term>
<term>Electron Transport</term>
<term>Hydrogen-Ion Concentration</term>
<term>Kinetics</term>
<term>Osmolar Concentration</term>
<term>Populus</term>
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<keywords scheme="MESH" xml:lang="fr"><term>Animaux</term>
<term>Cinétique</term>
<term>Concentration en ions d'hydrogène</term>
<term>Concentration osmolaire</term>
<term>Populus</term>
<term>Transport d'électrons</term>
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<front><div type="abstract" xml:lang="en">Oxidation of oxymyoglobin [MbO2(Fe2+)] by isoplastocyanins a (PCa) and b (PCb) was experimentally investigated and the corresponding redox reaction was modeled using the physicochemical parameters of the isoforms to study the effect of the dimorphism. The kinetic curve of oxidation of MbO2 (Fe2+) by oxidized PCa [PCa(Cu2+)] and PCb [PCb(Cu2+)] and the pH-dependence of the rate constant kI were determined. In the range of pH 4.8-9.0, PCb reacts with higher k1, compared with PCa. For example, at pH 7.0, k1(PCb) = 4 x 10(2) M(-1)s(-1), whereas k1(PCa)= 2 x 10(2) M(-1)S(-1). The observed values of deltaE(0) for the reaction pairs Mb-PCa and Mb-PCb were -304 mV and -319 mV, respectively. The effect of the ionic strength (mu) on the rate of the electron transfer was also studied. It was found that: (i) the net charge Z1 of PCa and PCb fully corresponds to that calculated by their primary structures and Z2 of Mb corresponds to that calculated by its titration curve; (ii) the In k as function of mean square of mu was similar for both PCa and PCb; (iii) the curve of the reaction PCb <----(e(-1)) Mb (pH 7.0) wasshifted towards higher values of k, in agreement with the larger net negative charge of PCb; and (iv) the character of the electrostatic interactions remained unchanged by a replacement of PCa by PCb and by the change of pH from 7.0 to 4.8.</div>
</front>
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<DateCompleted><Year>2010</Year>
<Month>09</Month>
<Day>17</Day>
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<DateRevised><Year>2009</Year>
<Month>12</Month>
<Day>23</Day>
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<JournalIssue CitedMedium="Print"><Volume>46</Volume>
<Issue>5</Issue>
<PubDate><Year>2009</Year>
<Month>Oct</Month>
</PubDate>
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<Title>Indian journal of biochemistry & biophysics</Title>
<ISOAbbreviation>Indian J Biochem Biophys</ISOAbbreviation>
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<ArticleTitle>Oxidation of oxymyoglobin by poplar plastocyanins a and b.</ArticleTitle>
<Pagination><MedlinePgn>383-8</MedlinePgn>
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<Abstract><AbstractText>Oxidation of oxymyoglobin [MbO2(Fe2+)] by isoplastocyanins a (PCa) and b (PCb) was experimentally investigated and the corresponding redox reaction was modeled using the physicochemical parameters of the isoforms to study the effect of the dimorphism. The kinetic curve of oxidation of MbO2 (Fe2+) by oxidized PCa [PCa(Cu2+)] and PCb [PCb(Cu2+)] and the pH-dependence of the rate constant kI were determined. In the range of pH 4.8-9.0, PCb reacts with higher k1, compared with PCa. For example, at pH 7.0, k1(PCb) = 4 x 10(2) M(-1)s(-1), whereas k1(PCa)= 2 x 10(2) M(-1)S(-1). The observed values of deltaE(0) for the reaction pairs Mb-PCa and Mb-PCb were -304 mV and -319 mV, respectively. The effect of the ionic strength (mu) on the rate of the electron transfer was also studied. It was found that: (i) the net charge Z1 of PCa and PCb fully corresponds to that calculated by their primary structures and Z2 of Mb corresponds to that calculated by its titration curve; (ii) the In k as function of mean square of mu was similar for both PCa and PCb; (iii) the curve of the reaction PCb <----(e(-1)) Mb (pH 7.0) wasshifted towards higher values of k, in agreement with the larger net negative charge of PCb; and (iv) the character of the electrostatic interactions remained unchanged by a replacement of PCa by PCb and by the change of pH from 7.0 to 4.8.</AbstractText>
</Abstract>
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<name sortKey="Donchev, Anthony A" sort="Donchev, Anthony A" uniqKey="Donchev A" first="Anthony A" last="Donchev">Anthony A. Donchev</name>
<name sortKey="Getov, Vladimir I" sort="Getov, Vladimir I" uniqKey="Getov V" first="Vladimir I" last="Getov">Vladimir I. Getov</name>
<name sortKey="Shosheva, Alexandra Ch" sort="Shosheva, Alexandra Ch" uniqKey="Shosheva A" first="Alexandra Ch" last="Shosheva">Alexandra Ch Shosheva</name>
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<country name="Bulgarie"><noRegion><name sortKey="Christova, Petya K" sort="Christova, Petya K" uniqKey="Christova P" first="Petya K" last="Christova">Petya K. Christova</name>
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Oxidation of oxymyoglobin by poplar plastocyanins a and b.

Oxidation of oxymyoglobin by poplar plastocyanins a and b.

Source :

Descripteurs français

English descriptors

Abstract

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

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki