The variability of light-harvesting complexes in aerobic anoxygenic phototrophs

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• 作者：Vadim Selyanin ; Dzmitry Hauruseu ; Michal Koblížek
• 关键词：Bacteriochlorophyll ; Purple non ; sulfur bacteria ; Photosynthetic unit size ; Bacterial photosynthesis ; Reaction center core complex
• 刊名：Photosynthesis Research
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：128
• 期：1
• 页码：35-43
• 全文大小：801 KB
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• 作者单位：Vadim Selyanin (1)
  Dzmitry Hauruseu (1)
  Michal Koblížek (1)
  
  1. Center Algatech, Institute of Microbiology CAS, 37981, Třeboň, Czech Republic
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5079

文摘

Light-harvesting capacity was investigated in six species of aerobic anoxygenic phototrophic (AAP) bacteria using absorption spectroscopy, fluorescence emission spectroscopy, and pigment analyses. Aerobically grown AAP cells contained approx. 140–1800 photosynthetic reaction centers per cell, an order of magnitude less than purple non-sulfur bacteria grown semiaerobically. Three of the studied AAP species did not contain outer light-harvesting complexes, and the size of their reaction center core complexes (RC–LH1 core complexes) varied between 29 and 36 bacteriochlorophyll molecules. In AAP species containing accessory antennae, the size was frequently reduced, providing between 5 and 60 additional bacteriochlorophyll molecules. In Roseobacter litoralis, it was found that cells grown at a higher light intensity contained more reaction centers per cell, while the size of the light-harvesting complexes was reduced. The presented results document that AAP species have both the reduced number and size of light-harvesting complexes which is consistent with the auxiliary role of phototrophy in this bacterial group.