Oxidation of oxymyoglobin by poplar plastocyanins a and b.
Identifieur interne : 003542 ( Main/Exploration ); précédent : 003541; suivant : 003543Oxidation of oxymyoglobin by poplar plastocyanins a and b.
Auteurs : Petya K. Christova [Bulgarie] ; Anthony A. Donchev ; Alexandra Ch Shosheva ; Vladimir I. Getov ; Mitko I. DimitrovSource :
- Indian journal of biochemistry & biophysics [ 0301-1208 ] ; 2009.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- 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:
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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>
<country xml:lang="fr">Bulgarie</country>
<wicri:regionArea>Institute of Organic Chemistry, Bulgarian Academy of Sciences, Sofia-1113</wicri:regionArea>
<wicri:noRegion>Sofia-1113</wicri:noRegion>
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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="Getov, Vladimir I" sort="Getov, Vladimir I" uniqKey="Getov V" first="Vladimir I" last="Getov">Vladimir I. Getov</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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<sourceDesc><biblStruct><analytic><title xml:lang="en">Oxidation of oxymyoglobin by poplar plastocyanins a and b.</title>
<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="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="Getov, Vladimir I" sort="Getov, Vladimir I" uniqKey="Getov V" first="Vladimir I" last="Getov">Vladimir I. Getov</name>
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<series><title level="j">Indian journal of biochemistry & biophysics</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animals (MeSH)</term>
<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>
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<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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<Month>09</Month>
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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>
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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>
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<name sortKey="Getov, Vladimir I" sort="Getov, Vladimir I" uniqKey="Getov V" first="Vladimir I" last="Getov">Vladimir I. Getov</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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