Some physicochemical peculiarities of poplar plastocyanins a and b.
Identifieur interne : 003403 ( Main/Exploration ); précédent : 003402; suivant : 003404Some physicochemical peculiarities of poplar plastocyanins a and b.
Auteurs : Petya K. Christova [Bulgarie] ; Anthony A. Donchev ; Alexandra C. Shosheva ; Vladimir I. Getov ; Mitko I. DimitrovSource :
- Zeitschrift fur Naturforschung. C, Journal of biosciences [ 0939-5075 ]
Descripteurs français
- KwdFr :
- MESH :
- composition chimique : Cucurbita, Eucaryotes, Plastocyanine, Populus.
- isolement et purification : Plastocyanine.
- Concentration en ions d'hydrogène, Oxydoréduction, Spectrophotométrie.
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Plastocyanin.
- chemistry : Cucurbita, Eukaryota, Populus.
- chemical , isolation & purification : Plastocyanin.
- Hydrogen-Ion Concentration, Oxidation-Reduction, Spectrophotometry.
Abstract
The redox potentials of poplar plastocyanins a and b (PCa, PCb) were determined by spectrophotometric titrations of their reduced forms with [Fe(CN)6]3-. It was found that the two isoforms have the following millimolar extinction coefficients epsilon597 equilibrium constants Keq of one-electron exchange with [Fe(CN)6]4-/[Fe(CN)6]3-, and standard electron potentials E0: PCa: epsilon597 = (4.72 +/- 0.08) mM(-1) cm(-1), Keq = 0.133 +/- 0.009, E0' = (354 +/- 11) mV; PCb: epsilon597 = (5.23 +/- 0.16) mM(-1) cm(-1), Keq = 0.175 +/- 0.010, E0' = (363 +/- 12) mV. The pH dependence of the redox potential of PCb was studied too. It was found, that the value of E0' for PCb is constant in the pH range 6.5-9.5, but decreases in the range 4.8-6.5. On the whole, the dependence resembles that of PC from some well-known plant species, including poplar PCa. The changes of E0' in the pH-dependent region for poplar PCb, however, are smaller and are 13 mV per pH unit, whereas in the other well-known plant species the changes are about 50-60 mV per pH unit. It has been assumed that the weaker pH dependence of EO' of PCb accounts for some structural differences between PCa and PCb.
DOI: 10.1515/znc-2009-5-617
PubMed: 19678546
Affiliations:
Links toward previous steps (curation, corpus...)
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Shosheva</name></author><author><name sortKey="Getov, Vladimir I" sort="Getov, Vladimir I" uniqKey="Getov V" first="Vladimir I" last="Getov">Vladimir I. Getov</name></author><author><name sortKey="Dimitrov, Mitko I" sort="Dimitrov, Mitko I" uniqKey="Dimitrov M" first="Mitko I" last="Dimitrov">Mitko I. Dimitrov</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2009">2009 May-Jun</date><idno type="RBID">pubmed:19678546</idno><idno type="pmid">19678546</idno><idno type="doi">10.1515/znc-2009-5-617</idno><idno type="wicri:Area/Main/Corpus">003483</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">003483</idno><idno type="wicri:Area/Main/Curation">003483</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Curation">003483</idno><idno type="wicri:Area/Main/Exploration">003483</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Some physicochemical peculiarities of 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. 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Dimitrov</name></author></analytic><series><title level="j">Zeitschrift fur Naturforschung. C, Journal of biosciences</title><idno type="ISSN">0939-5075</idno></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cucurbita (chemistry)</term><term>Eukaryota (chemistry)</term><term>Hydrogen-Ion Concentration (MeSH)</term><term>Oxidation-Reduction (MeSH)</term><term>Plastocyanin (chemistry)</term><term>Plastocyanin (isolation & purification)</term><term>Populus (chemistry)</term><term>Spectrophotometry (MeSH)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Concentration en ions d'hydrogène (MeSH)</term><term>Cucurbita (composition chimique)</term><term>Eucaryotes (composition chimique)</term><term>Oxydoréduction (MeSH)</term><term>Plastocyanine (composition chimique)</term><term>Plastocyanine (isolement et purification)</term><term>Populus (composition chimique)</term><term>Spectrophotométrie (MeSH)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Plastocyanin</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Cucurbita</term><term>Eukaryota</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="composition chimique" xml:lang="fr"><term>Cucurbita</term><term>Eucaryotes</term><term>Plastocyanine</term><term>Populus</term></keywords><keywords scheme="MESH" type="chemical" qualifier="isolation & purification" xml:lang="en"><term>Plastocyanin</term></keywords><keywords scheme="MESH" qualifier="isolement et purification" xml:lang="fr"><term>Plastocyanine</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Hydrogen-Ion Concentration</term><term>Oxidation-Reduction</term><term>Spectrophotometry</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Concentration en ions d'hydrogène</term><term>Oxydoréduction</term><term>Spectrophotométrie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The redox potentials of poplar plastocyanins a and b (PCa, PCb) were determined by spectrophotometric titrations of their reduced forms with [Fe(CN)6]3-. It was found that the two isoforms have the following millimolar extinction coefficients epsilon597 equilibrium constants Keq of one-electron exchange with [Fe(CN)6]4-/[Fe(CN)6]3-, and standard electron potentials E0: PCa: epsilon597 = (4.72 +/- 0.08) mM(-1) cm(-1), Keq = 0.133 +/- 0.009, E0' = (354 +/- 11) mV; PCb: epsilon597 = (5.23 +/- 0.16) mM(-1) cm(-1), Keq = 0.175 +/- 0.010, E0' = (363 +/- 12) mV. The pH dependence of the redox potential of PCb was studied too. It was found, that the value of E0' for PCb is constant in the pH range 6.5-9.5, but decreases in the range 4.8-6.5. On the whole, the dependence resembles that of PC from some well-known plant species, including poplar PCa. The changes of E0' in the pH-dependent region for poplar PCb, however, are smaller and are 13 mV per pH unit, whereas in the other well-known plant species the changes are about 50-60 mV per pH unit. It has been assumed that the weaker pH dependence of EO' of PCb accounts for some structural differences between PCa and PCb.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">19678546</PMID><DateCompleted><Year>2009</Year><Month>09</Month><Day>25</Day></DateCompleted><DateRevised><Year>2019</Year><Month>10</Month><Day>21</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0939-5075</ISSN><JournalIssue CitedMedium="Print"><Volume>64</Volume><Issue>5-6</Issue><PubDate><MedlineDate>2009 May-Jun</MedlineDate></PubDate></JournalIssue><Title>Zeitschrift fur Naturforschung. C, Journal of biosciences</Title><ISOAbbreviation>Z Naturforsch C J Biosci</ISOAbbreviation></Journal><ArticleTitle>Some physicochemical peculiarities of poplar plastocyanins a and b.</ArticleTitle><Pagination><MedlinePgn>399-404</MedlinePgn></Pagination><Abstract><AbstractText>The redox potentials of poplar plastocyanins a and b (PCa, PCb) were determined by spectrophotometric titrations of their reduced forms with [Fe(CN)6]3-. It was found that the two isoforms have the following millimolar extinction coefficients epsilon597 equilibrium constants Keq of one-electron exchange with [Fe(CN)6]4-/[Fe(CN)6]3-, and standard electron potentials E0: PCa: epsilon597 = (4.72 +/- 0.08) mM(-1) cm(-1), Keq = 0.133 +/- 0.009, E0' = (354 +/- 11) mV; PCb: epsilon597 = (5.23 +/- 0.16) mM(-1) cm(-1), Keq = 0.175 +/- 0.010, E0' = (363 +/- 12) mV. The pH dependence of the redox potential of PCb was studied too. It was found, that the value of E0' for PCb is constant in the pH range 6.5-9.5, but decreases in the range 4.8-6.5. On the whole, the dependence resembles that of PC from some well-known plant species, including poplar PCa. The changes of E0' in the pH-dependent region for poplar PCb, however, are smaller and are 13 mV per pH unit, whereas in the other well-known plant species the changes are about 50-60 mV per pH unit. It has been assumed that the weaker pH dependence of EO' of PCb accounts for some structural differences between PCa and PCb.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Christova</LastName><ForeName>Petya K</ForeName><Initials>PK</Initials><AffiliationInfo><Affiliation>Institute of Organic Chemistry, Bulgarian Academy of Sciences, Sofia-1113, Bulgaria.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Donchev</LastName><ForeName>Anthony A</ForeName><Initials>AA</Initials></Author><Author ValidYN="Y"><LastName>Shosheva</LastName><ForeName>Alexandra C</ForeName><Initials>AC</Initials></Author><Author ValidYN="Y"><LastName>Getov</LastName><ForeName>Vladimir I</ForeName><Initials>VI</Initials></Author><Author ValidYN="Y"><LastName>Dimitrov</LastName><ForeName>Mitko I</ForeName><Initials>MI</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>Germany</Country><MedlineTA>Z Naturforsch C J Biosci</MedlineTA><NlmUniqueID>8912155</NlmUniqueID><ISSNLinking>0341-0382</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>9014-09-9</RegistryNumber><NameOfSubstance UI="D010970">Plastocyanin</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D028464" MajorTopicYN="N">Cucurbita</DescriptorName><QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D056890" MajorTopicYN="N">Eukaryota</DescriptorName><QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D006863" MajorTopicYN="N">Hydrogen-Ion Concentration</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D010084" MajorTopicYN="N">Oxidation-Reduction</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D010970" MajorTopicYN="N">Plastocyanin</DescriptorName><QualifierName UI="Q000737" MajorTopicYN="Y">chemistry</QualifierName><QualifierName UI="Q000302" MajorTopicYN="N">isolation & purification</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName><QualifierName UI="Q000737" MajorTopicYN="Y">chemistry</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D013053" MajorTopicYN="N">Spectrophotometry</DescriptorName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2009</Year><Month>8</Month><Day>15</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2009</Year><Month>8</Month><Day>15</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2009</Year><Month>9</Month><Day>26</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">19678546</ArticleId><ArticleId IdType="doi">10.1515/znc-2009-5-617</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Bulgarie</li></country></list><tree><noCountry><name sortKey="Dimitrov, Mitko I" sort="Dimitrov, Mitko I" uniqKey="Dimitrov M" first="Mitko I" last="Dimitrov">Mitko I. Dimitrov</name><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 C" sort="Shosheva, Alexandra C" uniqKey="Shosheva A" first="Alexandra C" last="Shosheva">Alexandra C. Shosheva</name></noCountry><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></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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