Transient depletion of transported metabolites in the streaming cytoplasm of Chara upon shading the long-distance transmission pathway.
Identifieur interne : 000005 ( Main/Exploration ); précédent : 000004; suivant : 000006Transient depletion of transported metabolites in the streaming cytoplasm of Chara upon shading the long-distance transmission pathway.
Auteurs : Alexander A. Bulychev [Russie]Source :
- Biochimica et biophysica acta. Bioenergetics [ 1879-2650 ] ; 2020.
Descripteurs français
- KwdFr :
- MESH :
- cytologie : Chara.
- effets des radiations : Chara, Transport biologique.
- métabolisme : Chara, Cytoplasme.
- Cinétique, Obscurité.
English descriptors
- KwdEn :
- MESH :
Abstract
Export of reducing power from chloroplasts to cytoplasm serves to balance the NADPH/ATP ratio that is optimal for CO2 assimilation. Rapid cytoplasmic streaming in characean algae conveys the exported metabolites downstream towards the shaded plastids where envelope transporters may operate for the import of reducing power in accordance with the direction of concentration gradients. Import of reducing equivalents by chloroplasts in the analyzed area transiently enhances the pulse-modulated chlorophyll fluorescence F' controlled by the redox state of photosystem II acceptor QA. When the microfluidic pathway was transferred to darkness while the analyzed cell area remained in dim background light, the amplitude of cyclosis-mediated F' changes dropped sharply and then recovered within 5-10 min. The suppression of long-distance signaling indicates temporal depletion of transmitted metabolites in the streaming cytoplasm. The return to overall background illumination induced an exceptionally large F' response to the first local light pulse admitted to a remote cell region. This indicates the appearance of excess reductants in the streaming cytoplasm at a certain stage of photosynthetic induction. The results suggest highly dynamic exchange of metabolites between stationary chloroplasts lining the microfluidic pathway and the streaming cytoplasm upon light-dark and dark-light transitions. Evidence is obtained that slow stages of chlorophyll fluorescence induction in algae with rapid cytoplasmic streaming directly depend on cyclosis-mediated long-distance delivery of metabolites produced far beyond the analyzed cell area.
DOI: 10.1016/j.bbabio.2020.148257
PubMed: 32621805
Affiliations:
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Rapid cytoplasmic streaming in characean algae conveys the exported metabolites downstream towards the shaded plastids where envelope transporters may operate for the import of reducing power in accordance with the direction of concentration gradients. Import of reducing equivalents by chloroplasts in the analyzed area transiently enhances the pulse-modulated chlorophyll fluorescence F' controlled by the redox state of photosystem II acceptor Q<sub>A</sub>. When the microfluidic pathway was transferred to darkness while the analyzed cell area remained in dim background light, the amplitude of cyclosis-mediated F' changes dropped sharply and then recovered within 5-10 min. The suppression of long-distance signaling indicates temporal depletion of transmitted metabolites in the streaming cytoplasm. The return to overall background illumination induced an exceptionally large F' response to the first local light pulse admitted to a remote cell region. This indicates the appearance of excess reductants in the streaming cytoplasm at a certain stage of photosynthetic induction. The results suggest highly dynamic exchange of metabolites between stationary chloroplasts lining the microfluidic pathway and the streaming cytoplasm upon light-dark and dark-light transitions. Evidence is obtained that slow stages of chlorophyll fluorescence induction in algae with rapid cytoplasmic streaming directly depend on cyclosis-mediated long-distance delivery of metabolites produced far beyond the analyzed cell area.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">32621805</PMID><DateCompleted><Year>2020</Year><Month>10</Month><Day>26</Day></DateCompleted><DateRevised><Year>2020</Year><Month>10</Month><Day>26</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1879-2650</ISSN><JournalIssue CitedMedium="Internet"><Volume>1861</Volume><Issue>10</Issue><PubDate><Year>2020</Year><Month>10</Month><Day>01</Day></PubDate></JournalIssue><Title>Biochimica et biophysica acta. Bioenergetics</Title><ISOAbbreviation>Biochim Biophys Acta Bioenerg</ISOAbbreviation></Journal><ArticleTitle>Transient depletion of transported metabolites in the streaming cytoplasm of Chara upon shading the long-distance transmission pathway.</ArticleTitle><Pagination><MedlinePgn>148257</MedlinePgn></Pagination><ELocationID EIdType="pii" ValidYN="Y">S0005-2728(20)30107-9</ELocationID><ELocationID EIdType="doi" ValidYN="Y">10.1016/j.bbabio.2020.148257</ELocationID><Abstract><AbstractText>Export of reducing power from chloroplasts to cytoplasm serves to balance the NADPH/ATP ratio that is optimal for CO<sub>2</sub> assimilation. Rapid cytoplasmic streaming in characean algae conveys the exported metabolites downstream towards the shaded plastids where envelope transporters may operate for the import of reducing power in accordance with the direction of concentration gradients. Import of reducing equivalents by chloroplasts in the analyzed area transiently enhances the pulse-modulated chlorophyll fluorescence F' controlled by the redox state of photosystem II acceptor Q<sub>A</sub>. When the microfluidic pathway was transferred to darkness while the analyzed cell area remained in dim background light, the amplitude of cyclosis-mediated F' changes dropped sharply and then recovered within 5-10 min. The suppression of long-distance signaling indicates temporal depletion of transmitted metabolites in the streaming cytoplasm. The return to overall background illumination induced an exceptionally large F' response to the first local light pulse admitted to a remote cell region. This indicates the appearance of excess reductants in the streaming cytoplasm at a certain stage of photosynthetic induction. The results suggest highly dynamic exchange of metabolites between stationary chloroplasts lining the microfluidic pathway and the streaming cytoplasm upon light-dark and dark-light transitions. Evidence is obtained that slow stages of chlorophyll fluorescence induction in algae with rapid cytoplasmic streaming directly depend on cyclosis-mediated long-distance delivery of metabolites produced far beyond the analyzed cell area.</AbstractText><CopyrightInformation>Copyright © 2020 Elsevier B.V. All rights reserved.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Bulychev</LastName><ForeName>Alexander A</ForeName><Initials>AA</Initials><AffiliationInfo><Affiliation>Department of Biophysics, Faculty of Biology, Moscow State University, Moscow 119991, Russia. Electronic address: bulychev@biophys.msu.ru.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2020</Year><Month>07</Month><Day>01</Day></ArticleDate></Article><MedlineJournalInfo><Country>Netherlands</Country><MedlineTA>Biochim Biophys Acta Bioenerg</MedlineTA><NlmUniqueID>101731706</NlmUniqueID><ISSNLinking>0005-2728</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D001692" MajorTopicYN="N">Biological Transport</DescriptorName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D044784" MajorTopicYN="N">Chara</DescriptorName><QualifierName UI="Q000166" MajorTopicYN="Y">cytology</QualifierName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D003593" MajorTopicYN="N">Cytoplasm</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D003624" MajorTopicYN="N">Darkness</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D007700" MajorTopicYN="N">Kinetics</DescriptorName></MeshHeading></MeshHeadingList><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="Y">Chlorophyll fluorescence induction curves</Keyword><Keyword MajorTopicYN="Y">Chloroplast envelope</Keyword><Keyword MajorTopicYN="Y">Cytoplasmic streaming</Keyword><Keyword MajorTopicYN="Y">Long-distance communications</Keyword><Keyword MajorTopicYN="Y">Metabolite translocators</Keyword></KeywordList><CoiStatement>Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.</CoiStatement></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2020</Year><Month>04</Month><Day>04</Day></PubMedPubDate><PubMedPubDate PubStatus="revised"><Year>2020</Year><Month>06</Month><Day>11</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2020</Year><Month>06</Month><Day>18</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2020</Year><Month>7</Month><Day>6</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2020</Year><Month>10</Month><Day>27</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2020</Year><Month>7</Month><Day>5</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">32621805</ArticleId><ArticleId IdType="pii">S0005-2728(20)30107-9</ArticleId><ArticleId IdType="doi">10.1016/j.bbabio.2020.148257</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Russie</li></country><region><li>District fédéral central</li></region><settlement><li>Moscou</li></settlement><orgName><li>Université d'État de Moscou</li></orgName></list><tree><country name="Russie"><region name="District fédéral central"><name sortKey="Bulychev, Alexander A" sort="Bulychev, Alexander A" uniqKey="Bulychev A" first="Alexander A" last="Bulychev">Alexander A. 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