Photoprotection in a purple phototrophic bacterium mediated by oxygen-dependent alteration of carotenoid excited-state properties
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F12%3A00377720" target="_blank" >RIV/60077344:_____/12:00377720 - isvavai.cz</a>
Alternative codes found
RIV/60076658:12310/12:43883554
Result on the web
<a href="http://dx.doi.org/10.1073/pnas.1201413109" target="_blank" >http://dx.doi.org/10.1073/pnas.1201413109</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1073/pnas.1201413109" target="_blank" >10.1073/pnas.1201413109</a>
Alternative languages
Result language
angličtina
Original language name
Photoprotection in a purple phototrophic bacterium mediated by oxygen-dependent alteration of carotenoid excited-state properties
Original language description
We performed ultrafast absorption spectroscopy on membranes containing reaction center-light-harvesting 1-PufX (RC-LH1-PufX) complexes and show that when oxygen is present the incorporation of the keto group into spheroidene, forming spheroidenone, reconfigures the energy transfer pathway in the LH1, but not the LH2, antenna. The spheroidene/spheroidenone transition acts as a molecular switch, which is suggested to twist spheroidenone into an s-trans configuration, increasing its conjugation length andlowering the energy of the lowest triplet state so it can act as an effective quencher of singlet oxygen. We propose that spheroidene/spheroidenone switching represents a simple and effective photoprotective mechanism, of likely importance for phototrophic bacteria that encounter both light and oxygen.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BO - Biophysics
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GAP205%2F11%2F1164" target="_blank" >GAP205/11/1164: Excitation energy transfer in pigment-protein complexes of microorganisms</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Proceedings of the National Academy of Sciences of the United States of America
ISSN
0027-8424
e-ISSN
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Volume of the periodical
109
Issue of the periodical within the volume
22
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
8570-8575
UT code for WoS article
000304881700047
EID of the result in the Scopus database
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