Exciton Delocalization Promotes Far-Red Absorption in a Tetrameric Chlorophyll a Light-Harvesting Complex from Trachydiscus minutus
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F25%3A00646030" target="_blank" >RIV/60077344:_____/25:00646030 - isvavai.cz</a>
Alternative codes found
RIV/61388971:_____/25:00646030 RIV/60076658:12310/25:43910790
Result on the web
<a href="https://pubs.acs.org/doi/pdf/10.1021/jacs.5c17299?ref=article_openPDF" target="_blank" >https://pubs.acs.org/doi/pdf/10.1021/jacs.5c17299?ref=article_openPDF</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/jacs.5c17299" target="_blank" >10.1021/jacs.5c17299</a>
Alternative languages
Result language
angličtina
Original language name
Exciton Delocalization Promotes Far-Red Absorption in a Tetrameric Chlorophyll a Light-Harvesting Complex from Trachydiscus minutus
Original language description
Photosynthetic organisms employ light-harvesting complexes (LHCs) to optimize energy capture under variable light conditions. The freshwater eustigmatophyte Trachydiscus minutus accumulates a red-shifted violaxanthin-chlorophyll protein (rVCP) that contributes to far-red light harvesting using only chlorophyll (Chl) a molecules, without chemical modification or substitution of pigments. Based on high-resolution cryo-EM and multiscale quantum chemical calculations, we uncovered a heterodimer-based tetrameric architecture, representing a unique oligomerization mode among LHCs. Within each heterodimer, Chls a are distinctively arranged adjacent to the terminal emitter, forming an unprecedentedly extended chlorophyll cluster. Quantum chemical calculations reveal three strong exciton-coupled pigment domains, two of which reside in the large cluster and solely account for the intense far-red absorption near 700 nm without contributions from charge-transfer states. Our structural and quantum chemical characterizations of far-red light harvesting reveal a molecular mechanism of red spectral tuning that relies on protein-controlled excitonic coupling of identical Chl a pigments, as demonstrated here in this eustigmatophyte, highlighting diverse adaptations for harvesting spectrally shifted, low-energy light.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10608 - Biochemistry and molecular biology
Result continuities
Project
<a href="/en/project/EH22_008%2F0004624" target="_blank" >EH22_008/0004624: PHOTOMACHINES - Photosynthetic cell redesign for high yields of therapeutic peptides</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of the American Chemical Society
ISSN
0002-7863
e-ISSN
1520-5126
Volume of the periodical
147
Issue of the periodical within the volume
51
Country of publishing house
US - UNITED STATES
Number of pages
15
Pages from-to
47675-47689
UT code for WoS article
001638309000001
EID of the result in the Scopus database
2-s2.0-105025677468