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Ground-State Molecular Interactions of Bacteriochlorophyll C in Chlorosomes of Green Bacteria and in Model Systems: A Resonance Raman Study

  • M. Lutz
  • G. van Brakel

Abstract

Chlorosomes of green photosynthetic bacteria from the two fami lies Chlorobiaceae and Chloroflexaceae contain large amounts of BChls c, d or e, which constitute peripheral antenna systems connected to the intrinsic membrane antenna (Olson, 1980). Chlorosomes of the two best studied species, Chlorobium limicola and Chloroflexus aurantiacus contain BChl c (Fig. 1). In both species these molecules appear highly organized. Their lowest singlet electronic transitions Qy assume mutuaL coupling and the resulting transition moments exhibit non-random orientations, being predominantly parallel to the membrane COLson, 1980; Betti et al., 1982; van Dorsen et al., 1986a, b; Gerola and Olson, 1986). BChl c is thought to be associated with small polypeptides (Schmitz, 1967; Wechsler et al., 1985; Gerola et al., 1988). These associations however must be somewhat weaker than in intrinsic membrane antenna complexes, considering the ease with which BChl c can be washed from chlorosomes (Feick and Fuller, 1984), and the fact that it has not yet been possible to extract any intact BChl c-protein from chlorosomes.

Keywords

Green Sulfur Bacterium Resonance Raman Spectrum Magnesium Atom Resonance Raman Spectroscopy Hydroxyethyl Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • M. Lutz
    • 1
  • G. van Brakel
    • 2
  1. 1.Département de BiologieCEN SaclayGif-sur-YvetteFrance
  2. 2.Biokemisk InstitutOdense UniversitetOdenseDenmark

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