Monte Carlo simulations of excitation and electron transfer in grana membranes
| Autor: | Grzegorz Jackowski, Małgorzata Adamiec, Rienk van Grondelle, Weronika Sipińska, Robert Luciński, Krzysztof Gibasiewicz, Przemyslaw Chelminiak, Wojciech Giera, Edyta Głów, Jerzy Karolczak, Sebastian Szewczyk |
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| Přispěvatelé: | Biophysics Photosynthesis/Energy, LaserLaB - Energy |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Photosynthetic reaction centre
Light Harvesting Complex II Monte Carlo method Analytical chemistry Arabidopsis Light-Harvesting Protein Complexes Biophysics Primary charge separation Molecular physics Models Biological Thylakoids Biochemistry Photosystem II Electron Transport Electron transfer Excitation energy transfer Computer Simulation Diffusion (business) Photosynthesis Monte Carlo simulation Range (particle radiation) Chemistry Arabidopsis Proteins Serine Endopeptidases Photosystem II Protein Complex Streak camera Cell Biology Plants Genetically Modified Kinetics Membrane Spectrometry Fluorescence Energy Transfer Mutation Chlorophyll Binding Proteins Monte Carlo Method Excitation |
| Zdroj: | Biochimica et Biophysica Acta (BBA)-Bioenergetics, 1847(3), 314-327. Elsevier Gibasiewisz, K, Adamiec, M, Lucinski, R, Giera, W, Chelminiak, P, Szewcyk, S, Sipinska, W, Glow, E, Karolczak, J, van Grondelle, R & Jackowski, G 2015, ' Monte Carlo simulations of excitation and electron transfer in grana membranes ', Biochimica et Biophysica Acta (BBA)-Bioenergetics, vol. 1847, no. 3, pp. 314-327 . https://doi.org/10.1016/j.bbabio.2014.12.004 |
| ISSN: | 0005-2728 |
| Popis: | Time-resolved fluorescence measurements on grana membranes with instrumental response function of 3 ps reveal faster excitation dynamics (120 ps) than those reported previously. A possible reason for the faster decay may be a relatively low amount of "extra" LHCII trimers per reaction center of Photosystem II. Monte Carlo modeling of excitation dynamics in C2S2M2 form of PSII-LHCII supercomplexes has been performed using a coarse grained model of this complex, constituting a large majority of proteins in grana membranes. The main factor responsible for the fast fluorescence decay reported in this work was the deep trap constituted by the primary charge separated state in the reaction center (950-1090 cm- 1). This value is critical for a good fit, whereas typical hopping times between antenna polypeptides (from ~ 4.5 to ~ 10.5 ps) and reversible primary charge separation times (from ~ 4 to ~ 1.5 ps, respectively) are less critical. Consequently, respective mean migration times of excitation from anywhere in the PSII-LHCII supercomplexes to reaction center range from ~ 30 to ~ 80 ps. Thus 1/4-2/3 of the ~ 120-ps average excitation lifetime is necessary for the diffusion of excitation to reaction center, whereas the remaining time is due to the bottle-neck effect of the trap. Removal of 27% of the Lhcb6 apoprotein pool by mutagenesis of DEG5 gene caused the acceleration of the excitation decay from ~ 120 to ~ 100 ps. This effect may be due to the detachment of LHCII-M trimers from PSII-LHCII supercomplexes, accompanied by deepening of the reaction center trap. |
| Databáze: | OpenAIRE |
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