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We present a spectroscopic investigation of the light-harvesting role of carotenoids in aggregates of the IsiA pigment–protein complex of the cyanobacterium Synechocystis PCC 6803. The results show that carotenoids in IsiA transfer energy on the sub-100fs timescale from the S 2 state to chlorophyll to about the same extent as in the related pigment–protein complexes CP43 and CP47. Selective...
The organization of bacteriochlorophyll c (BChl c) molecules was studied in normal and carotenoid-deficient chlorosomes isolated from the green phototrophic bacterium Chloroflexus aurantiacus. Carotenoid-deficient chlorosomes were obtained from cells grown in the presence of 60 µg of 2-hydroxybiphenyl per ml. At this concentration, BChl c synthesis was not affected while the formation of the 5.7 kDa...
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