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Pigment interactions in chlorosomes of various green bacteria

Abstract

Resonance Raman experiments were performed on different green bacteria. With blue excitation, i.e. under Soret resonance or preresonance conditions, resonance Raman contributions were essentially arising from the chlorosome pigments. By comparing these spectra and those of isolated chlorosomes, it is possible to evaluate how the latter retain their native structure during the isolation procedures. The structure of bacteriochlorophyll oligomers in chlorosomes was interspecifically compared, in bacteriochlorophyllc- and bacteriochlorophylle- synthesising bacteria. It appears that interactions assumed by the 9-keto carbonyl group are identical inChlorobium limicola, Chlorobium tepidum, andChlorobium phaeobacteroides. In the latter strain, the 3-formyl carbonyl group of bacteriochlorophylle is kept free from intermolecular interactions. By contrast, resonance Raman spectra unambiguously indicate that the structure of bacteriochlorophyll oligomers is slightly different in chlorosomes fromChloroflexus auranticus, either isolated or in the whole bacteria.

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Abbreviations

BChl:

bacteriochlorophyll

Chl:

chlorophyll

Cb. :

chlorobium

Cf. :

Chloroflexus

fwhm:

full width half maximum

RR:

resonance Raman

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Feiler, U., Albouy, D., Lutz, M. et al. Pigment interactions in chlorosomes of various green bacteria. Photosynth Res 41, 175–180 (1994). https://doi.org/10.1007/BF02184158

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  • DOI: https://doi.org/10.1007/BF02184158

Key words

  • Chlorobium
  • Chloroflexus
  • chlorophyll
  • light-harvesting
  • photosynthesis
  • resonance Raman