Quenching of chlorophyll fluorescence in the major light-harvesting complex of photosystem II: a systematic study of the effect of carotenoid structure.
AUTOR(ES)
Phillip, D
RESUMO
The role of carotenoids in quenching of chlorophyll fluorescence in the major light-harvesting complex of photosystem II has been studied with a view to understanding the molecular basis of the control of photoprotective nonradiative energy dissipation by the xanthophyll cycle in vivo. The control of chlorophyll fluorescence quenching in the isolated complex has been investigated in terms of the number of the conjugated double bonds for a series of carotenoids ranging from n = 5-19, giving an estimated first excited singlet state energy from 20,700 cm-1 to 10,120 cm-1. At pH 7.8 the addition of exogenous carotenoids with >=10 conjugated double bonds (including zeaxanthin) stimulated fluorescence quenching relative to the control with no added carotenoid, whereas those with n
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=39967Documentos Relacionados
- Chlorophyll a and carotenoid triplet states in light-harvesting complex II of higher plants.
- A Major Light-Harvesting Polypeptide of Photosystem II Functions in Thermal DissipationW⃞
- A Role for a Light-Harvesting Antenna Complex of Photosystem II in Photoprotection
- Chlorophyll and carotenoid binding in a simple red algal light-harvesting complex crosses phylogenetic lines
- Structure of a photosystem II supercomplex isolated from Prochloron didemni retaining its chlorophyll a/b light-harvesting system
