ArticleBiophysical journal2007
Triplet exciton formation as a novel photoprotection mechanism in chlorosomes of Chlorobium tepidum.
Article in Biophysical journal, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed.
- Early Archean origin of Photosystem II.Geobiology · 2019Article
- Coherent phenomena in photosynthetic light harvesting: part one-theory and spectroscopy.Biophysical reviews · 2018Review
- Photoprotective, excited-state quenching mechanisms in diverse photosynthetic organisms.The Journal of biological chemistry · 2018Review
- An unusual role for the phytyl chains in the photoprotection of the chlorophylls bound to Water-Soluble Chlorophyll-binding Proteins.Scientific reports · 2017Article
- Oxygen concentration inside a functioning photosynthetic cell.Biophysical journal · 2014Article
- Structural and functional roles of carotenoids in chlorosomes.Journal of bacteriology · 2013Article
- Identification of the bacteriochlorophylls, carotenoids, quinones, lipids, and hopanoids of "Candidatus Chloracidobacterium thermophilum".Journal of bacteriology · 2012Article
- The chlorosome: a prototype for efficient light harvesting in photosynthesis.Photosynthesis research · 2010Review
- Alternating syn-anti bacteriochlorophylls form concentric helical nanotubes in chlorosomes.Proceedings of the National Academy of Sciences of the United States of America · 2009Article
- Functional analysis of three sulfide:quinone oxidoreductase homologs in Chlorobaculum tepidum.Journal of bacteriology · 2009Article
- Isorenieratene biosynthesis in green sulfur bacteria requires the cooperative actions of two carotenoid cyclases.Journal of bacteriology · 2008Article
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5 authors.
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Abstract
Chlorosomes comprise thousands of bacteriochlorophylls (BChl c, d, or e) in a closely packed structure surrounded by a lipid-protein envelope and additionally contain considerable amounts of carotenoids, quinones, and BChl a. It has been suggested that carotenoids in chlorosomes provide photoprotection by rapidly quenching triplet excited states of BChl via a triplet-triplet energy transfer mechanism that prevents energy transfer to oxygen and the formation of harmful singlet oxygen. In this work we studied triplet energy transfer kinetics and photodegradation of chlorosomes isolated from wild-type Chlorobium tepidum and from genetically modified species with different types of carotenoids and from a carotenoid-free mutant. Supporting a photoprotective function of carotenoids, carotenoid-free chlorosomes photodegrade approximately 3 times faster than wild-type chlorosomes. However, a significant fraction of the BChls forms a long-lived, triplet-like state that does not interact with carotenoids or with oxygen. We propose that these states are triplet excitons that form due to triplet-triplet interaction between the closely packed BChls. Numerical exciton simulations predict that the energy of these triplet excitons may fall below that of singlet oxygen and triplet carotenoids; this would prevent energy transfer from triplet BChl. Thus, the formation of triplet excitons in chlorosomes serves as an alternative photoprotection mechanism.
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