Role of Carotenoids in Light-Harvesting Processes in an Antenna Protein from the Chromophyte Xanthonema debile

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F12%3A00381460" target="_blank" >RIV/60077344:_____/12:00381460 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12310/12:43883428

Výsledek na webu

<a href="http://dx.doi.org/10.1021/jp3042796" target="_blank" >http://dx.doi.org/10.1021/jp3042796</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/jp3042796" target="_blank" >10.1021/jp3042796</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Role of Carotenoids in Light-Harvesting Processes in an Antenna Protein from the Chromophyte Xanthonema debile

Popis výsledku v původním jazyce

We employed femtosecond transient absorption spectroscopy to study energy transfer pathways in the main light-harvesting complex of Xanthonema debile, denoted XLH, which contains four carotenoids, diadinoxanthin, heteroxanthin, diatoxanthin and vaucheriaxanthin, and Chl-a. Overall carotenoid-to-chlorophyll energy transfer efficiency is about 60%, but energy transfer pathways are excitation wavelength dependent. Energy transfer from the carotenoid S2 state is active after excitation at both 490 nm (maximum of carotenoid absorption) and 510 nm (red edge of carotenoid absorption), but this channel is significantly more efficient after 510 nm excitation. Concerning the energy transfer pathway from the S1 state, XLH contains two groups of carotenoids: thosethat have the S1 route active (25%) and those having the S1 pathway silent. Besides the light-harvesting function, carotenoids in XLH also have photoprotective role; they quench Chl-a triplets via triplet-triplet energy transfer from Chl

Název v anglickém jazyce

Role of Carotenoids in Light-Harvesting Processes in an Antenna Protein from the Chromophyte Xanthonema debile

Popis výsledku anglicky

We employed femtosecond transient absorption spectroscopy to study energy transfer pathways in the main light-harvesting complex of Xanthonema debile, denoted XLH, which contains four carotenoids, diadinoxanthin, heteroxanthin, diatoxanthin and vaucheriaxanthin, and Chl-a. Overall carotenoid-to-chlorophyll energy transfer efficiency is about 60%, but energy transfer pathways are excitation wavelength dependent. Energy transfer from the carotenoid S2 state is active after excitation at both 490 nm (maximum of carotenoid absorption) and 510 nm (red edge of carotenoid absorption), but this channel is significantly more efficient after 510 nm excitation. Concerning the energy transfer pathway from the S1 state, XLH contains two groups of carotenoids: thosethat have the S1 route active (25%) and those having the S1 pathway silent. Besides the light-harvesting function, carotenoids in XLH also have photoprotective role; they quench Chl-a triplets via triplet-triplet energy transfer from Chl

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BO - Biofyzika

OECD FORD obor

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Projekt

<a href="/cs/project/GAP205%2F11%2F1164" target="_blank" >GAP205/11/1164: Přenos excitační energie v pigment-proteinových komplexech mikroorganismů</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry B

ISSN

1520-6106

e-ISSN

—

Svazek periodika

116

Číslo periodika v rámci svazku

30

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

8880-8889

Kód UT WoS článku

000306989800017

EID výsledku v databázi Scopus

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