Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria

Abstract Chlorosomes are the main light-harvesting complexes of green photosynthetic bacteria that are adapted to a phototrophic life at low-light conditions. They contain a large number of bacteriochlorophyll c, d, or e molecules organized in self-assembling aggregates. Tight packing of the pigment...

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Autores principales:	Tomáš Malina, Rob Koehorst, David Bína, Jakub Pšenčík, Herbert van Amerongen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/886aec814f1e4f3cb024a1ee5ce74d4f
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spelling	oai:doaj.org-article:886aec814f1e4f3cb024a1ee5ce74d4f2021-12-02T14:26:26ZSuperradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria10.1038/s41598-021-87664-32045-2322https://doaj.org/article/886aec814f1e4f3cb024a1ee5ce74d4f2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87664-3https://doaj.org/toc/2045-2322Abstract Chlorosomes are the main light-harvesting complexes of green photosynthetic bacteria that are adapted to a phototrophic life at low-light conditions. They contain a large number of bacteriochlorophyll c, d, or e molecules organized in self-assembling aggregates. Tight packing of the pigments results in strong excitonic interactions between the monomers, which leads to a redshift of the absorption spectra and excitation delocalization. Due to the large amount of disorder present in chlorosomes, the extent of delocalization is limited and further decreases in time after excitation. In this work we address the question whether the excitonic interactions between the bacteriochlorophyll c molecules are strong enough to maintain some extent of delocalization even after exciton relaxation. That would manifest itself by collective spontaneous emission, so-called superradiance. We show that despite a very low fluorescence quantum yield and short excited state lifetime, both caused by the aggregation, chlorosomes indeed exhibit superradiance. The emission occurs from states delocalized over at least two molecules. In other words, the dipole strength of the emissive states is larger than for a bacteriochlorophyll c monomer. This represents an important functional mechanism increasing the probability of excitation energy transfer that is vital at low-light conditions. Similar behaviour was observed also in one type of artificial aggregates, and this may be beneficial for their potential use in artificial photosynthesis.Tomáš MalinaRob KoehorstDavid BínaJakub PšenčíkHerbert van AmerongenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tomáš Malina Rob Koehorst David Bína Jakub Pšenčík Herbert van Amerongen Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria
description	Abstract Chlorosomes are the main light-harvesting complexes of green photosynthetic bacteria that are adapted to a phototrophic life at low-light conditions. They contain a large number of bacteriochlorophyll c, d, or e molecules organized in self-assembling aggregates. Tight packing of the pigments results in strong excitonic interactions between the monomers, which leads to a redshift of the absorption spectra and excitation delocalization. Due to the large amount of disorder present in chlorosomes, the extent of delocalization is limited and further decreases in time after excitation. In this work we address the question whether the excitonic interactions between the bacteriochlorophyll c molecules are strong enough to maintain some extent of delocalization even after exciton relaxation. That would manifest itself by collective spontaneous emission, so-called superradiance. We show that despite a very low fluorescence quantum yield and short excited state lifetime, both caused by the aggregation, chlorosomes indeed exhibit superradiance. The emission occurs from states delocalized over at least two molecules. In other words, the dipole strength of the emissive states is larger than for a bacteriochlorophyll c monomer. This represents an important functional mechanism increasing the probability of excitation energy transfer that is vital at low-light conditions. Similar behaviour was observed also in one type of artificial aggregates, and this may be beneficial for their potential use in artificial photosynthesis.
format	article
author	Tomáš Malina Rob Koehorst David Bína Jakub Pšenčík Herbert van Amerongen
author_facet	Tomáš Malina Rob Koehorst David Bína Jakub Pšenčík Herbert van Amerongen
author_sort	Tomáš Malina
title	Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria
title_short	Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria
title_full	Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria
title_fullStr	Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria
title_full_unstemmed	Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria
title_sort	superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/886aec814f1e4f3cb024a1ee5ce74d4f
work_keys_str_mv	AT tomasmalina superradianceofbacteriochlorophyllcaggregatesinchlorosomesofgreenphotosyntheticbacteria AT robkoehorst superradianceofbacteriochlorophyllcaggregatesinchlorosomesofgreenphotosyntheticbacteria AT davidbina superradianceofbacteriochlorophyllcaggregatesinchlorosomesofgreenphotosyntheticbacteria AT jakubpsencik superradianceofbacteriochlorophyllcaggregatesinchlorosomesofgreenphotosyntheticbacteria AT herbertvanamerongen superradianceofbacteriochlorophyllcaggregatesinchlorosomesofgreenphotosyntheticbacteria
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Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria

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