Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.45412

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 45, 307–315 (2005)

IDENTIFICATION OF CHLOROPHYLL MOLECULES IN PERIPHERAL LIGHT HARVESTING COMPLEX LHC II^∗
Š. Vaitekonis, G. Trinkūnas, and L. Valkūnas
Institute of Physics, Savanorių 231, LT-02300 Vilnius, Lithuania
E-mail: sarunas@ar.fi.lt

Received 27 June 2005

Chlorophyll site excitation energies of the peripheral plant light-harvesting complex (LHC-II) have been determined by simulating the steady-state absorption and circular dichroism spectra and using new structural data. By applying the genetic algorithm search procedure it has been found that the fit to circular dichroism spectra is critical in narrowing the space of possible solutions. The obtained chlorophyll energy assignment has been verified by the Monte Carlo simulations of the excitation annihilation kinetics. It suggests that the chlorophyll a dimers a611-a612, a613-a614, and a602-a603 constitute the sites for the energy migration across the peripheral plant light-harvesting antenna.

Keywords: light-harvesting, LHC-II, genetic algorithm, exciton
PACS: 92.20.Lw, 71.35.-y, 87.15.Aa.
^∗The report presented at the 36th Lithuanian National Physics Conference, 16–18 June 2005, Vilnius, Lithuania

CHLOROFILO MOLEKULIŲ IDENTIFIKACIJA PERIFERINIAME ŠVIESĄ SURENKANČIAME KOMPLEKSE LHC II
Š. Vaitekonis, G. Trinkūnas, L. Valkūnas
Fizikos institutas, Vilnius, Lietuva

Modeliuojant nuostoviuosius sugerties ir cirkuliarinio dichroizmo spektrus, panaudojus naujus struktūrinius duomenis, įvertintos periferinio šviesą surenkančio komplekso (LHC-II) chlorofilo molekulių sužadinimo energijos. Taikant genetinio algoritmo paieškos procedūrą, pastebėta, kad sprendinių paieškos erdvę labiausiai siaurina teorinio ir eksperimentinio cirkuliarinio dichroizmo spektrų sutapimas. Rastos chlorofilo molekulių sužadinimo energijos vertės patikrintos Monte Carlo metodu modeliuojant sužadinimo anihiliacijos kinetikos būdus. Pastebėta, kad chlorofilo a molekulių dimerai a611–a612, a613–a614 ir a602–a603 yra mazgai, kuriais periferinėje šviesą surenkančioje antenoje vyksta energijos migracija.

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