Spectral dependence of energy transfer in wild-type peripheral light-harvesting complexes of photosynthetic bacteria.
The precise position of the upper exciton component and relevant vibronic transitions of the B850 ring in peripheral light-harvesting complexes from purple photosynthetic bacteria are important values for determining the exciton bandwidth and electronic structure of the B850 ring. To determine the presence of these components in wild-type LH2 complexes the pump-probe femtosecond transient spectra obtained with excitation into the 730-840 nm spectral range are analyzed. We show that at excitation wavelengths less than 780 nm B850 absorption bands are present and that, in accordance with exciton theory, these bands peak further in the blue when the lowest optically allowed transition is more red-shifted.
Gall
Andrew
A
CEA, Institut de Biologie et Technologie de Saclay, et CNRS, 91191 Gif-sur-Yvette cedex, France. andrew.gall@cea.fr
Sogaila
Egidijus
E
Gulbinas
Vidmantas
V
Ilioaia
Oana
O
Robert
Bruno
B
Valkunas
Leonas
L
D001419:Bacteria / Q000378:metabolism*; D004735:Energy Transfer; D045342:Light-Harvesting Protein Complexes / Q000378:metabolism*; D010788:Photosynthesis; D013057:Spectrum Analysis
D045342:Light-Harvesting Protein Complexes