[Calculation of spectra of absorption and circular dichroism of Rhodopseudomonas acidophila light harvesting complexes based on roentgen structural data].
Absorption and circular dichroism spectra of two forms of the peripheral light-harvesting complex from photosynthetic purple bacteria Rhodopseudomonas acidophila were calculated. Calculations were carried out on the basis of exciton theory for circular aggregates of bacteriochlorophyll molecules and X-ray data for these forms of the complex. It was shown that theoretical spectra fit well experimental ones at the same values of excitation energy, homogeneous and inhomogeneous broadening, and bandwidth for all bacteriochlorophyll molecules of complexes. To approximate the circular dichroism spectra of complexes, it was necessary to change the orientations and the values of the moments of transition of Qy molecules relative to their orientation determined on the basis of X-ray structure analysis data.
Belozerskii Research Institute of Physicochemical Biology, Lomonosov State University, Vorob'evy Gory, Moscow, 119992 Russia.
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RIu
Pishchal'nikov
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AP
Razzhivin
D000465:Algorithms; D002942:Circular Dichroism; D018360:Crystallography, X-Ray; D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry*; D012241:Rhodopseudomonas / Q000737:chemistry*; D013053:Spectrophotometry
D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins