Facilitated transport of Mn2+ in sycamore (Acer pseudoplatanus) cells and excised maize root tips. A comparative 31P n.m.r. study in vivo.
Identifieur interne : 001291 ( Pmc/Checkpoint ); précédent : 001290; suivant : 001292Facilitated transport of Mn2+ in sycamore (Acer pseudoplatanus) cells and excised maize root tips. A comparative 31P n.m.r. study in vivo.
Auteurs : C. Roby ; R. Bligny ; R. Douce ; S I Tu ; P E PfefferSource :
- Biochemical Journal [ 0264-6021 ] ; 1988.
Abstract
Movement of paramagnetic Mn2+ into sycamore (Acer pseudoplatanus) cells has been indirectly examined by observing the line broadening exhibited in its 31P n.m.r. spectra. Mn2+ was observed to pass into the vacuole, while exhibiting a very minor accumulation in the cytoplasm. With time, gradual leakage of phosphate from the vacuole to the cytoplasm was observed along with an increase in glucose-6-phosphate. Anoxia did not appear to affect the relative distribution of Mn2+ in the cytoplasm and vacuole. Under hypoxic conditions restriction of almost all movement of Mn2+ across the plasmalemma as well as the tonoplast was observed. In contrast, maize root tips showed entry and complete complexation of nucleotide triphosphate by Mn2+ during hypoxia. The rate of passage of Mn2+ across the tonoplast in both sycamore and maize root cells is approximately the same. However, the rates of facilitated movement across the respective plasma membranes appear to differ. More rapid movement of Mn2+ across the plasmalemma in maize root tip cells allows a gradual build-up of metal ion in the cytoplasm prior to its diffusion across the tonoplast. Sycamore cells undergo a slower uptake of Mn2+ into their cytoplasms (comparable with the rate of diffusion through the tonoplast), so little or no observable accumulation of Mn2+ is observed in this compartment.
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PubMed: 3415663
PubMed Central: 1149159
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Facilitated transport of Mn2+ in sycamore (Acer pseudoplatanus) cells and excised maize root tips. A comparative 31P n.m.r. study in vivo.</title><author><name sortKey="Roby, C" sort="Roby, C" uniqKey="Roby C" first="C" last="Roby">C. Roby</name></author><author><name sortKey="Bligny, R" sort="Bligny, R" uniqKey="Bligny R" first="R" last="Bligny">R. Bligny</name></author><author><name sortKey="Douce, R" sort="Douce, R" uniqKey="Douce R" first="R" last="Douce">R. Douce</name></author><author><name sortKey="Tu, S I" sort="Tu, S I" uniqKey="Tu S" first="S I" last="Tu">S I Tu</name></author><author><name sortKey="Pfeffer, P E" sort="Pfeffer, P E" uniqKey="Pfeffer P" first="P E" last="Pfeffer">P E Pfeffer</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">3415663</idno><idno type="pmc">1149159</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1149159</idno><idno type="RBID">PMC:1149159</idno><date when="1988">1988</date><idno type="wicri:Area/Pmc/Corpus">000764</idno><idno type="wicri:Area/Pmc/Curation">000763</idno><idno type="wicri:Area/Pmc/Checkpoint">001291</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Facilitated transport of Mn2+ in sycamore (Acer pseudoplatanus) cells and excised maize root tips. A comparative 31P n.m.r. study in vivo.</title><author><name sortKey="Roby, C" sort="Roby, C" uniqKey="Roby C" first="C" last="Roby">C. Roby</name></author><author><name sortKey="Bligny, R" sort="Bligny, R" uniqKey="Bligny R" first="R" last="Bligny">R. Bligny</name></author><author><name sortKey="Douce, R" sort="Douce, R" uniqKey="Douce R" first="R" last="Douce">R. Douce</name></author><author><name sortKey="Tu, S I" sort="Tu, S I" uniqKey="Tu S" first="S I" last="Tu">S I Tu</name></author><author><name sortKey="Pfeffer, P E" sort="Pfeffer, P E" uniqKey="Pfeffer P" first="P E" last="Pfeffer">P E Pfeffer</name></author></analytic><series><title level="j">Biochemical Journal</title><idno type="ISSN">0264-6021</idno><idno type="eISSN">1470-8728</idno><imprint><date when="1988">1988</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Movement of paramagnetic Mn2+ into sycamore (Acer pseudoplatanus) cells has been indirectly examined by observing the line broadening exhibited in its 31P n.m.r. spectra. Mn2+ was observed to pass into the vacuole, while exhibiting a very minor accumulation in the cytoplasm. With time, gradual leakage of phosphate from the vacuole to the cytoplasm was observed along with an increase in glucose-6-phosphate. Anoxia did not appear to affect the relative distribution of Mn2+ in the cytoplasm and vacuole. Under hypoxic conditions restriction of almost all movement of Mn2+ across the plasmalemma as well as the tonoplast was observed. In contrast, maize root tips showed entry and complete complexation of nucleotide triphosphate by Mn2+ during hypoxia. The rate of passage of Mn2+ across the tonoplast in both sycamore and maize root cells is approximately the same. However, the rates of facilitated movement across the respective plasma membranes appear to differ. More rapid movement of Mn2+ across the plasmalemma in maize root tip cells allows a gradual build-up of metal ion in the cytoplasm prior to its diffusion across the tonoplast. Sycamore cells undergo a slower uptake of Mn2+ into their cytoplasms (comparable with the rate of diffusion through the tonoplast), so little or no observable accumulation of Mn2+ is observed in this compartment.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Biochem J</journal-id><journal-title>Biochemical Journal</journal-title><issn pub-type="ppub">0264-6021</issn><issn pub-type="epub">1470-8728</issn></journal-meta><article-meta><article-id pub-id-type="pmid">3415663</article-id><article-id pub-id-type="pmc">1149159</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title>Facilitated transport of Mn2+ in sycamore (Acer pseudoplatanus) cells and excised maize root tips. A comparative 31P n.m.r. study in vivo.</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Roby</surname><given-names>C</given-names></name></contrib><contrib contrib-type="author"><name><surname>Bligny</surname><given-names>R</given-names></name></contrib><contrib contrib-type="author"><name><surname>Douce</surname><given-names>R</given-names></name></contrib><contrib contrib-type="author"><name><surname>Tu</surname><given-names>S I</given-names></name></contrib><contrib contrib-type="author"><name><surname>Pfeffer</surname><given-names>P E</given-names></name></contrib></contrib-group><aff>Department de Recherche Fondamentale/Résonance Magnétique Biologique et Médicale, Université Scientifique et Médicale 85x, Grenoble, France.</aff><pub-date pub-type="ppub"><day>1</day><month>6</month><year>1988</year></pub-date><volume>252</volume><issue>2</issue><fpage>401</fpage><lpage>408</lpage><abstract><p>Movement of paramagnetic Mn2+ into sycamore (Acer pseudoplatanus) cells has been indirectly examined by observing the line broadening exhibited in its 31P n.m.r. spectra. Mn2+ was observed to pass into the vacuole, while exhibiting a very minor accumulation in the cytoplasm. With time, gradual leakage of phosphate from the vacuole to the cytoplasm was observed along with an increase in glucose-6-phosphate. Anoxia did not appear to affect the relative distribution of Mn2+ in the cytoplasm and vacuole. Under hypoxic conditions restriction of almost all movement of Mn2+ across the plasmalemma as well as the tonoplast was observed. In contrast, maize root tips showed entry and complete complexation of nucleotide triphosphate by Mn2+ during hypoxia. The rate of passage of Mn2+ across the tonoplast in both sycamore and maize root cells is approximately the same. However, the rates of facilitated movement across the respective plasma membranes appear to differ. More rapid movement of Mn2+ across the plasmalemma in maize root tip cells allows a gradual build-up of metal ion in the cytoplasm prior to its diffusion across the tonoplast. Sycamore cells undergo a slower uptake of Mn2+ into their cytoplasms (comparable with the rate of diffusion through the tonoplast), so little or no observable accumulation of Mn2+ is observed in this compartment.</p></abstract></article-meta></front></pmc><affiliations><list></list><tree><noCountry><name sortKey="Bligny, R" sort="Bligny, R" uniqKey="Bligny R" first="R" last="Bligny">R. Bligny</name><name sortKey="Douce, R" sort="Douce, R" uniqKey="Douce R" first="R" last="Douce">R. Douce</name><name sortKey="Pfeffer, P E" sort="Pfeffer, P E" uniqKey="Pfeffer P" first="P E" last="Pfeffer">P E Pfeffer</name><name sortKey="Roby, C" sort="Roby, C" uniqKey="Roby C" first="C" last="Roby">C. Roby</name><name sortKey="Tu, S I" sort="Tu, S I" uniqKey="Tu S" first="S I" last="Tu">S I Tu</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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