Number of the records: 1

Carotenoids in Energy Transfer and Quenching Processes in Pcb and Pcb-PS I Complexes from Prochlorothrix hollandica

SYSNO ASEP	0345900
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Carotenoids in Energy Transfer and Quenching Processes in Pcb and Pcb-PS I Complexes from Prochlorothrix hollandica
Author(s)	Durchan, Milan (BC-A)_RID Herbstová, Miroslava (BC-A)_RID Fuciman, M. (CZ) Gardian, Zdenko (BC-A)_RID Vácha, František (BC-A)_RID Polívka, Tomáš (BC-A)_{RID, ORCID}
Number of authors	6
Source Title	Journal of Physical Chemistry B. - : American Chemical Society - ISSN 1520-6106 Roč. 114, č. 28 (2010), s. 9275-9282
Number of pages	8 s.
Language	eng - English
Country	US - United States
Keywords	carotenoids ; oxyphotobacteria ; energy transfer
Subject RIV	BO - Biophysics
R&D Projects	IAA608170604 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	IAA608170603 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z50510513 - UMBR-M, BC-A (2005-2011)
UT WOS	000279787400022
DOI	10.1021/jp1026724
Annotation	Chlorophyll (Chl) a/b-binding proteins from Prochlorothrix hollandica known as Pcb antennae were studied by femtosecond transient absorption to identify energy transfer rates and pathways. Carotenoids transfer energy to Chl with low efficiency of ~25% in Pcb complexes. Analysis of transient absorption spectra identified a pathway from the hot S1 state of carotenoids as the major energy transfer channel between whereas the S2 state contributes only marginally to energy transfer. Due to energetic reasons, no energy transfer is possible via the relaxed S1 state of carotenoids. The low overall energy transfer efficiency of carotenoids recognizes chlorophylls as the main light-harvesting pigments. Besides Chl a, presence of Chl b, which transfers energy to Chl a with nearly 100% efficiency, significantly broadens the spectral range accessible for light-harvesting and improves cross-section of Pcb complexes. The major role of carotenoids in Pcb is photoprotection.
Workplace	Biology Centre (since 2006)
Contact	Dana Hypšová, eje@eje.cz, Tel.: 387 775 214
Year of Publishing	2012

Number of the records: 1