Abstract
Absorption of light is the primary event to drive photosynthesis in photosynthetic bacteria. The light energy is then transferred among antenna pigments and finally delivered to reaction center (RC) where the photochemical charge separation takes place. The RC polypeptides are known to be highly conserved through many kinds of photosynthetic organisms [1]; RC II in higher plants, “quinone type RC”, is similar to RC of purple photosynthetic bacteria, whereas RC I, “Fe-S type RC”, to that of (strictly) anaerobic green bacteria (Chlorobium limicola or Heliobacterium chlorurn). On the other hand, the polypeptides of antenna pigment protein complex are divergent; only a partial similarity is suggested [2]. Physical basis to sustain the function of pigment protein complex, however, might be similar to each other, which is not clearly elucidated.
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