Spectroscopic Properties of Violaxanthin and Lutein Triplet States in LHCII are Independent of Carotenoid Composition

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F19%3A43899725" target="_blank" >RIV/60076658:12310/19:43899725 - isvavai.cz</a>
Alternative codes found
RIV/61388971:_____/19:00518123
Result on the web
<a href="https://pubs.acs.org/doi/pdf/10.1021/acs.jpcb.9b06293" target="_blank" >https://pubs.acs.org/doi/pdf/10.1021/acs.jpcb.9b06293</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jpcb.9b06293" target="_blank" >10.1021/acs.jpcb.9b06293</a>

Result language
angličtina
Original language name
Spectroscopic Properties of Violaxanthin and Lutein Triplet States in LHCII are Independent of Carotenoid Composition
Original language description
Chlorophyll triplet excited states are byproducts of photosynthetic processes that can indirectly harm biological membranes by forming highly reactive oxygen species. A crucial photoprotective mechanism evolved by plants to counter this threat involves the triplet energy transfer from chlorophylls to carotenoid molecules, in which triplet states are not reactive. In the major light-harvesting complex of photosystem II (LHCII), the two central luteins play an important role in the mechanism, but it has been shown that carotenoid triplets are formed even when other carotenoids replace them in their binding sites. In this work, we have investigated carotenoid triplet formation in LHCII isolated from Arabidopsis thaliana npq1lut2 plants, in which violaxanthin replaces lutein. Although transient absorption spectroscopy showed altered singlet excited-state dynamics in the mutant LHCII without lutein, these antennae formed carotenoid triplets that were spectrally and dynamically identical to the wild-type protein. We conclude that lutein-binding sites in LHCII have conserved characteristics to ensure efficient triplet energy transfer to the carotenoid molecules that they accommodate, making the identity of the carotenoid trivial per se.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10403 - Physical chemistry

Project
<a href="/en/project/GX19-28323X" target="_blank" >GX19-28323X: Relation between structure and function of carotenoids: New pathways to answer unresolved questions</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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