Journal
PHOTOSYNTHETICA
Volume 56, Issue 1, Pages 254-264Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s11099-018-0782-z
Keywords
circular dichroism; merocyanine-540; non-bilayer lipids; osmolyte; time-resolved fluorescence spectroscopy
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Funding
- Hungarian Ministry for National Economy [GINOP-2.3.2-15-2016-00001, GINOP-2.3.2-15-2016-00058]
- National Research Development and Innovation Office of Hungary [OTKA K 112688]
- Hungarian Academy of Sciences
- Moravian-Silesian Region [01211/2016/RRC]
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The principal function of the thylakoid membrane depends on the integrity of the lipid bilayer, yet almost half of the thylakoid lipids are of non-bilayer-forming type, whose exact functions are not fully understood. Non-bilayer lipids can be extruded from the membrane in the presence of high concentrations of co-solutes. We applied 2 M sucrose to induce lipid phase separation in isolated thylakoid membranes, following consequent structural and physiological effects. Circular dichroism spectroscopy indicated significant changes in the chiral macro-arrangement of the pigment-protein complexes, which were reversed after washing out the co-solute. Similarly, merocyanine-540 fluorescence suggested reversible changes in the lipid phases. The PSII function, as tested by chlorophyll fluorescence induction transients and time-resolved fluorescence, was almost unaffected. However, the presence of sucrose dramatically increased the PSII thermostability, which can partly be explained by a direct osmolyte effect and partly by the lipid phase separation stabilizing the stacked membrane.
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