Dependence of Chlorophyll Fluorescence Quenching on the Lipid-to-Protein Ratio in Reconstituted Light-Harvesting Complex II Membranes Containing Lipid Labels

The quenching of chlorophyll-a fluorescence was investigated in plant light-harvesting complex II (LHCII) embedded in reconstituted membranes containing thylakoid lipids and a lipid label. The proteoliposomes were further separated by density and the protein and lipid contents of the fractions were...

Teljes leírás

Elmentve itt :
Bibliográfiai részletek
Szerzők: Akhtar Parveen
Görföl Fanni
Garab Győző
Lambrev Petar
Dokumentumtípus: Cikk
Megjelent: 2019
Sorozat:CHEMICAL PHYSICS 522
Tárgyszavak:
doi:10.1016/j.chemphys.2019.03.012

mtmt:30629753
Online Access:http://publicatio.bibl.u-szeged.hu/27330
Leíró adatok
Tartalmi kivonat:The quenching of chlorophyll-a fluorescence was investigated in plant light-harvesting complex II (LHCII) embedded in reconstituted membranes containing thylakoid lipids and a lipid label. The proteoliposomes were further separated by density and the protein and lipid contents of the fractions were quantified spectrophotometrically, allowing tighter control over the L/P ratios in a wide range of values. Using time-resolved fluorescence, we found a strong correlation between the fluorescence quenching and the L/P ratio, in line with other studies reporting progressive quenching at low L/P ratios, presumably triggered by self-clustering in the membrane. The average fluorescence lifetimes decreased to 0.3 ns at L/P ratios below 50:1; these values are comparable to the quenching observed in plants under excess-light conditions and are accompanied by a similar far-red fluorescence signature. It is hypothesized that plants can exploit the intrinsic quenching propensity of LHCII-only membrane domains to safely store extra antenna units.
Terjedelem/Fizikai jellemzők:242-248
ISSN:0301-0104