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Variable fluorescence in green sulfur bacteria.

Martin F Hohmann-Marriott1, Robert E Blankenship

  • 1Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, USA.

Biochimica Et Biophysica Acta
|December 27, 2006
PubMed
Summary
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Green sulfur bacteria exhibit surprising fluorescence modulation, similar to oxygenic phototrophs. This regulation primarily occurs at the Fenna-Matthews-Olson (FMO) protein level, not in chlorosomes.

Area of Science:

  • Photosynthesis research
  • Bacteriochlorophyll fluorescence
  • Microbial photobiology

Background:

  • Green sulfur bacteria utilize complex photosynthetic machinery, including chlorosomes for light harvesting.
  • Energy transfer involves bacteriochlorophyll a-containing baseplate and Fenna-Matthews-Olson (FMO) antenna proteins connecting to reaction centers.

Purpose of the Study:

  • To investigate fluorescence yield and spectral properties of photosynthetic complexes in intact green sulfur bacteria.
  • To compare fluorescence modulation in green sulfur bacteria with oxygenic phototrophs.

Main Methods:

  • Studied intact cells of green sulfur bacteria under physiological, anaerobic conditions.
  • Utilized fluorescence yield and spectral property analysis.
  • Focused on the Fenna-Matthews-Olson (FMO) protein and chlorosome emission.

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Main Results:

  • Observed complex fluorescence yield modulation upon illumination, mirroring oxygenic phototrophs.
  • Fluorescence initially peaks and then decreases to a lower steady state within minutes.
  • Modulation primarily affects the FMO protein, with minimal change in chlorosome emission.

Conclusions:

  • Green sulfur bacteria display a sophisticated regulatory mechanism for light harvesting.
  • Potential mechanisms include direct excitation quenching at the FMO protein or indirect modulation by electron carrier reduction state.