In situ mapping of the energy flow through the entire photosynthetic apparatus
Jazyk angličtina Země Velká Británie, Anglie Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
27325098
DOI
10.1038/nchem.2525
PII: nchem.2525
Knihovny.cz E-zdroje
- MeSH
- Chlorobi metabolismus MeSH
- fotosyntéza MeSH
- přenos energie MeSH
- sluneční záření MeSH
- spektrální analýza metody MeSH
- světlo MeSH
- světlosběrné proteinové komplexy chemie MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- světlosběrné proteinové komplexy MeSH
Absorption of sunlight is the first step in photosynthesis, which provides energy for the vast majority of organisms on Earth. The primary processes of photosynthesis have been studied extensively in isolated light-harvesting complexes and reaction centres, however, to understand fully the way in which organisms capture light it is crucial to also reveal the functional relationships between the individual complexes. Here we report the use of two-dimensional electronic spectroscopy to track directly the excitation-energy flow through the entire photosynthetic system of green sulfur bacteria. We unravel the functional organization of individual complexes in the photosynthetic unit and show that, whereas energy is transferred within subunits on a timescale of subpicoseconds to a few picoseconds, across the complexes the energy flows at a timescale of tens of picoseconds. Thus, we demonstrate that the bottleneck of energy transfer is between the constituents.
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