NDLI: Singlet-triplet excitation fission in light-harvesting complexes of photosynthetic bacteria and in isolated carotenoids

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Singlet-triplet excitation fission in light-harvesting complexes of photosynthetic bacteria and in isolated carotenoids

Content Provider	Springer Nature Link
Author	Klenina, I. B. Makhneva, Z. K. Moskalenko, A. A. Kuzmin, A. N. Proskuryakov, I. I.
Copyright Year	2013
Abstract	Time-resolved electron paramagnetic resonance was used to study the properties of carotenoid triplet states populated in LH2 light-harvesting complexes of phototrophic bacteria Allochromatium minutissimum, Rhodopseudomonas palustris, and in carotenoid films free of bacteriochlorophyll. The study was performed on purified LH2 preparations not contaminated by reaction centers, and under selective pigment excitation. The obtained results enable a conclusion that the carotenoid triplet states, both in LH2 complexes and films, are populated in the process of homofission of singlet excitation into two triplets, which involves only carotenoid molecules. It is observed that the fission process in magnetic field leads to predominant population of the T$_{0}$ spin sublevel of the triplet. One molecular spin sublevel of the triplet is demonstrated to possess an increased probability of intersystem crossing to the ground state, independent of the carotenoid configuration. Pigment composition of the LH2 protein heterodimers is discussed, and a conclusion of the possible presence of two interacting carotenoid molecules is made.
Starting Page	43
Ending Page	50
Page Count	8
File Format	PDF
ISSN	00063509
Journal	Biophysics
Volume Number	58
Issue Number	1
e-ISSN	15556654
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2013-04-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	light-harvesting complexes carotenoid triplet state singlet-triplet excitation fission electron paramagnetic resonance phototrophic bacteria Biophysics and Biological Physics
Content Type	Text
Resource Type	Article
Subject	Biophysics

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Singlet-triplet fission of carotenoid excitation in light-harvesting LH2 complexes of purple phototrophic bacteria

Singlet-triplet fission of carotenoid excitation in light-harvesting LH2 complexes of purple phototrophic bacteria

Carotenoid triplet states in vitro and in light-harvesting complexes of the phototrophic bacterium Allochromatium minutissimum

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Singlet-triplet excitation fission in light-harvesting complexes of photosynthetic bacteria and in isolated carotenoids

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Can giant chlorosomes be part of the light-harvesting antennae of green bacteria?

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Singlet-triplet excitation fission in light-harvesting complexes of photosynthetic bacteria and in isolated carotenoids