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The baseplate subantenna in chlorosomes of green anoxygenic photosynthetic bacteria, belonging to the families  Chloroflexaceae  and  Chlorobiaceae , is known to represent a complex of bacteriochlorophyll (BChl)  a  with the ~6 kDa CsmA proteins. Earlier, we showed the existence of a similar BChl  a  subantenna in chlorosomes of the photosynthetic green bacterium  Oscillochloris trichoides , member of  Oscillochloridaceae , the third family of green photosynthetic bacteria. However, this BChl  a  subantenna was not visually identified in absorption spectra of isolated  Osc. trichoides  chlorosomes in contrast to those of  Chloroflexaceae  and  Chlorobiaceae . In this work, using room and low-temperature absorbance and fluorescence spectroscopy and sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis of alkaline-treated and untreated chlorosomes of  Osc. trichoides , we showed that the baseplate BChl  a  subantenna does exist in  Oscillochloridaceae  chlorosomes as a complex of BChl  a  with the 5.7 kDa CsmA protein. The present results support the idea that the baseplate subantenna, representing a complex of BChl  a  with a ~6 kDa CsmA protein, is a universal interface between the BChl  c  subantenna of chlorosomes and the nearest light-harvesting BChl  a  subantenna in all three known families of green anoxygenic photosynthetic bacteria.

journal of biophysics/journal of biophysics 

CsmA Protein is Associated with BChl a in the Baseplate Subantenna of Chlorosomes of the Photosynthetic Green Filamentous Bacterium Oscillochloris trichoides belonging to the Family Oscillochloridaceae