Thermal stability studies of photosystem II complexes reconstituted into phosphatidylcholine liposomes

Thermal stability studies of photosystem II complexes reconstituted into phosphatidylcholine... Light-harvesting II complexes (LHCII) and photosystem II core complexes (PSIICC) were isolated from spinach (Spinacia oleracea L.) and reconstituted into phosphatidylcholine liposomes and, under heat stress, PSIICC-LHCII proteoliposomes were found to exhibit significantly higher oxygen evolution activity than PSIICC proteoliposomes lacking LHCII. In the presence of LHCII, the temperature of a 10-min heat stress that caused semi-inactivation of oxygen-evolving activity in these liposomes increased from 34 to ∼37°C and the total inactivation temperature increased from ∼50 to ∼60°C. Moreover, with heat stress, decreases in the absorbance and fluorescence spectra of PSIICC-LHCII proteoliposomes were smaller than in LHCII-lacking PSIICC proteoliposomes. These results demonstrated that reconstitution of PSII into liposomes with LHCII increased the antenna size and light harvesting cross-section of PSII and thus, under heat stress, enhanced PSII photochemical activity and thermal stability. Russian Journal of Plant Physiology Springer Journals

Thermal stability studies of photosystem II complexes reconstituted into phosphatidylcholine liposomes

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Springer US
Copyright © 2014 by Pleiades Publishing, Ltd.
Life Sciences; Plant Physiology; Plant Sciences
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