Baza Publikacji Pracowników Politechniki Lubelskiej

Status:
Autorzy:	Gruszecki Wiesław, Luchowski Rafał, Zubik Monika, Grudziński Wojciech, Janik Ewa, Gospodarek Małgorzata, Goc Jacek, Fiedor Leszek, Gryczyński Zygmunt, Gryczyński Ignacy
Rok wydania:	2010
Wersja dokumentu:	Drukowana \| Elektroniczna
Język:	angielski
Numer czasopisma:	1-2
Wolumen/Tom:	373
Strony:	122 - 128
Impact Factor:	2,017
Web of Science® Times Cited:	16
Scopus® Cytowania:	14
Bazy:	Web of Science \| Scopus
Efekt badań statutowych	NIE
Materiał konferencyjny:	NIE
Publikacja OA:	NIE
Abstrakty:	angielski
	The problem of photoprotection associated with the xanthophyll cycle is addressed by examination of effects of exogenous violaxanthin and zeaxanthin on isolated antenna complex LHCII. Analysis of electronic absorption spectra suggests multiple sites of binding of violaxanthin and zeaxanthin to the protein environment. Xanthophyll binding results in enhancement of excitonic bands at ca. 530 and 740 nm, as concluded on the basis of Resonance Light Scattering spectra. The energy states attributed to these excitonic bands are concluded to quench singlet excitations. Fluorescence Lifetime Imaging Microscopy shows that both xanthophylls, but in particular zeaxanthin, promote formation of supramolecular structures characterized by extremely low fluorescence yield. Photoprotective meaning of the xanthophyll cycle is concluded to be primarily based upon role of zeaxanthin in promoting formation of supramolecular structures of LHCII characterized by high rate of energy dissipation.

Photoprotective role of the xanthophyll cycle studied by means of modeling of xanthophyll–LHCII interactions