Photosynthetica 2010, 48(3):475-480 | DOI: 10.1007/s11099-010-0063-y

Pigment composition and functional state of the thylakoid membranes during preparation of samples for pigment-protein complexes separation by nondenaturing gel electrophoresis

V. Karlický1,2, J. Podolinská2, L. Nadkanská2, M. Štroch2,*, M. Čajánek2, V. Špunda2
1 Laboratory of Biophysics, Faculty of Science, Palacký University, Olomouc, Czech Republic
2 Department of Physics, Faculty of Science, Ostrava University, Ostrava 1, Czech Republic

The present study was conducted to examine changes in photosynthetic pigment composition and functional state of the thylakoid membranes during the individual steps of preparation of samples that are intended for a separation of pigmentprotein complexes by nondenaturing polyacrylamide gel electrophoresis. The thylakoid membranes were isolated from barley leaves (Hordeum vulgare L.) grown under low irradiance (50 μmol m-2 s-1). Functional state of the thylakoid membrane preparations was evaluated by determination of the maximal photochemical efficiency of photosystem (PS) II (FV/FM) and by analysis of excitation and emission spectra of chlorophyll a (Chl a) fluorescence at 77 K. All measurements were done at three phases of preparation of the samples: (1) in the suspensions of osmotically-shocked broken chloroplasts, (2) thylakoid membranes in extraction buffer containing Tris, glycine, and glycerol and (3) thylakoid membranes solubilized with a detergent decyl-β-D-maltosid. FV/FM was reduced from 0.815 in the first step to 0.723 in the second step and to values close to zero in solubilized membranes. Pigment composition was not pronouncedly changed during preparation of the thylakoid membrane samples. Isolation of thylakoid membranes affected the efficiency of excitation energy transfer within PSII complexes only slightly. Emission and excitation fluorescence spectra of the solubilized membranes resemble spectra of trimers of PSII light-harvesting complexes (LHCII). Despite a disrupted excitation energy transfer from LHCII to PSII antenna core in solubilized membranes, energy transfer from Chl b and carotenoids to emission forms of Chl a within LHCII trimers remained effective.

Additional key words: 77-K chlorophyll fluorescence spectra; Hordeum vulgare; photochemical efficiency; polyacrylamide gel electrophoresis; thylakoid membranes isolation

Received: December 16, 2009; Accepted: May 25, 2010; Published: September 1, 2010  Show citation

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Karlický, V., Podolinská, J., Nadkanská, L., Štroch, M., Čajánek, M., & Špunda, V. (2010). Pigment composition and functional state of the thylakoid membranes during preparation of samples for pigment-protein complexes separation by nondenaturing gel electrophoresis. Photosynthetica, 48(3), 475-480. doi: 10.1007/s11099-010-0063-y
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