The variability of light-harvesting complexes in aerobic anoxygenic phototrophs
Jazyk angličtina Země Nizozemsko Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
26482589
DOI
10.1007/s11120-015-0197-7
PII: 10.1007/s11120-015-0197-7
Knihovny.cz E-zdroje
- Klíčová slova
- Bacterial photosynthesis, Bacteriochlorophyll, Photosynthetic unit size, Purple non-sulfur bacteria, Reaction center core complex,
- MeSH
- aerobióza MeSH
- Alphaproteobacteria chemie metabolismus MeSH
- bakteriochlorofyly metabolismus MeSH
- fotosyntetické reakční centrum - proteinové komplexy chemie metabolismus MeSH
- fototrofní procesy MeSH
- Gammaproteobacteria chemie metabolismus MeSH
- světlosběrné proteinové komplexy chemie metabolismus MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- bakteriochlorofyly MeSH
- fotosyntetické reakční centrum - proteinové komplexy MeSH
- světlosběrné proteinové komplexy MeSH
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.
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