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Isolation and pigment composition of the antenna system of four species of green sulfur bacteria

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Abstract

New and rapid procedures were developed for the isolation of chlorosomes and FMO-protein from the green sulfur bacteria Prosthecochloris (P.) aestuarii, Chlorobium (Cb.) phaeovibrioides, Cb. tepidum and Cb. vibrioforme. The resulting preparations were free from contaminating pigments and proteins as was shown by absorption spectroscopy, pigment analysis and SDS-PAGE. Two spectrally different types of FMO-protein were found. The first type, present in P. aestuarii and Cb. vibrioforme, has a main absorption band at 6 K at 815 nm, whereas the second type, isolated from Cb. tepidum and Cb. phaeovibrioides, has a strong band at 806 nm. In contrast to what was recently suggested (Tronrud DE and Matthews BW (1993) In: Deisenhofer J and Norris J (eds) The Photosynthetic Reaction Center, Vol 1, pp 13–21. Academic Press, San Diego, CA) the FMO-proteins contained no polar BChl a homologue. The isolated chlorosomes showed a small blue-shift of the QY absorption maximum with respect to intact cells. For the different species, grown under the same light conditions, the homologue composition of BChls c and d was approximately identical whereas for the BChl e in Cb. phaeovibrioides the relative amounts of homologues with larger alkyl substituents at position 8 were considerably larger. Baseplate BChl a was present in all chlorosomes and comprised 1–2% of the chlorosomal BChl. Its QY absorption band was located at about 802 nm and was clearly separated from the major QY absorption band at 6 K. The predominant esterifying alcohol of BChl a in the chlorosomes as well as in the FMO-proteins was phytol, but both antenna complexes also contained small amounts of BChl a esterified with the metabolic intermediates geranylgeraniol, dihydrogeranylgeraniol and tetrahydrogeranylgeraniol, like most purple bacteria. Since the esterifying alcohols of the chlorosomal BChl a and of the main chlorosomal pigments (BChls c, d and e) are different, esterification, and perhaps also the synthesis, of the BChls in the interior of the chlorosome and of the BChls in the baseplate must be spatially and genetically separated processes.

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  1. Christof Francke

    Present address: Department of Biological Chemistry, Hebrew University, Givat Ram, Jerusalem, Israel

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  1. Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA, Leiden, the Netherlands

    Christof Francke & Jan Amesz

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Francke, C., Amesz, J. Isolation and pigment composition of the antenna system of four species of green sulfur bacteria. Photosynthesis Research 52, 137–146 (1997). https://doi.org/10.1023/A:1005845828676

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