Journal of Photoscience

Korean Society of Photoscience (한국광과학회)
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Variation in the Size of Light Harvesting 1 of Purple Bacteria

  • Akiyama, Machiko (Institute of Materials Science, University of Tsukuba) ;
  • Nagashima, Kenji V.P. (Department of Biology. Tokyo Metropolitan University) ;
  • Inoue, Ryouji (Institute of Materials Science, University of Tsukuba) ;
  • Wakayama, Tatsuki (NIBH Laboratory. AIST/MITI) ;
  • Kise, Hideo (Institute of Materials Science, University of Tsukuba) ;
  • Hara, Masayuki (Res. Inst. Advanced Sci. Technol., Osaka Prefecture Univ) ;
  • Kobayashi, Masami (Institute of Materials Science, University of Tsukuba)
  • Published : 2002.08.01
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Abstract

We examined the bacteriochlorophyill/bacteriopheophytin ratios in several species of purple bacteria containing only LHI. The pigment ratios depended greatly on species. Further, Rhodospirillum rubrum showed wide variation when grown under different light intensity, and Rhodobium marinum showed significant variation from culture to culture even under the same light conditions. The protein ratios of a/RC and $\beta$/RC estimated by SDS-PAGE of chromatophores of Rsp. rubrum and Rbi. marinum exhibited the ratio of $\beta$/$\alpha$ > 1. These findings gave us the novel idea that there are two types of LHl; one is a C-shaped open antenna composed by $\alpha$$\beta$ units surrounding a RC, and another is a small closed ring antenna composed by $\alpha$$\beta$ units located peripherally in a variable ratio to the core complex like LH2.

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