A pathway for protective quenching in antenna proteins of Photosystem II

Abstract Photosynthesis is common in nature, converting sunlight energy into proton motive force and reducing power. The increased spectral range absorption of light exerted by pigments (i.e. chlorophylls, Chls) within Light Harvesting Complexes (LHCs) proves an important advantage under low light c...

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Autores principales:	Sotiris Papadatos, Antreas C. Charalambous, Vangelis Daskalakis
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/50e74ee039fc4d2eabba8449060f808e
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spelling	oai:doaj.org-article:50e74ee039fc4d2eabba8449060f808e2021-12-02T15:05:56ZA pathway for protective quenching in antenna proteins of Photosystem II10.1038/s41598-017-02892-w2045-2322https://doaj.org/article/50e74ee039fc4d2eabba8449060f808e2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02892-whttps://doaj.org/toc/2045-2322Abstract Photosynthesis is common in nature, converting sunlight energy into proton motive force and reducing power. The increased spectral range absorption of light exerted by pigments (i.e. chlorophylls, Chls) within Light Harvesting Complexes (LHCs) proves an important advantage under low light conditions. However, in the exposure to excess light, oxidative damages and ultimately cell death can occur. A down-regulatory mechanism, thus, has been evolved (non-photochemical quenching, NPQ). The mechanistic details of its major component (qE) are missing at the atomic scale. The research herein, initiates on solid evidence from the current NPQ state of the art, and reveals a detailed atomistic view by large scale Molecular Dynamics, Metadynamics and ab initio Simulations. The results demonstrate a complete picture of an elaborate common molecular design. All probed antenna proteins (major LHCII from spinach-pea, CP29 from spinach) show striking plasticity in helix-D, under NPQ conditions. This induces changes in Qy bands in excitation and absorption spectra of the near-by pigment pair (Chl613-614) that could emerge as a new quenching site. Zeaxanthin enhances this plasticity (and possibly the quenching) even at milder NPQ conditions.Sotiris PapadatosAntreas C. CharalambousVangelis DaskalakisNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-13 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sotiris Papadatos Antreas C. Charalambous Vangelis Daskalakis A pathway for protective quenching in antenna proteins of Photosystem II
description	Abstract Photosynthesis is common in nature, converting sunlight energy into proton motive force and reducing power. The increased spectral range absorption of light exerted by pigments (i.e. chlorophylls, Chls) within Light Harvesting Complexes (LHCs) proves an important advantage under low light conditions. However, in the exposure to excess light, oxidative damages and ultimately cell death can occur. A down-regulatory mechanism, thus, has been evolved (non-photochemical quenching, NPQ). The mechanistic details of its major component (qE) are missing at the atomic scale. The research herein, initiates on solid evidence from the current NPQ state of the art, and reveals a detailed atomistic view by large scale Molecular Dynamics, Metadynamics and ab initio Simulations. The results demonstrate a complete picture of an elaborate common molecular design. All probed antenna proteins (major LHCII from spinach-pea, CP29 from spinach) show striking plasticity in helix-D, under NPQ conditions. This induces changes in Qy bands in excitation and absorption spectra of the near-by pigment pair (Chl613-614) that could emerge as a new quenching site. Zeaxanthin enhances this plasticity (and possibly the quenching) even at milder NPQ conditions.
format	article
author	Sotiris Papadatos Antreas C. Charalambous Vangelis Daskalakis
author_facet	Sotiris Papadatos Antreas C. Charalambous Vangelis Daskalakis
author_sort	Sotiris Papadatos
title	A pathway for protective quenching in antenna proteins of Photosystem II
title_short	A pathway for protective quenching in antenna proteins of Photosystem II
title_full	A pathway for protective quenching in antenna proteins of Photosystem II
title_fullStr	A pathway for protective quenching in antenna proteins of Photosystem II
title_full_unstemmed	A pathway for protective quenching in antenna proteins of Photosystem II
title_sort	pathway for protective quenching in antenna proteins of photosystem ii
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/50e74ee039fc4d2eabba8449060f808e
work_keys_str_mv	AT sotirispapadatos apathwayforprotectivequenchinginantennaproteinsofphotosystemii AT antreasccharalambous apathwayforprotectivequenchinginantennaproteinsofphotosystemii AT vangelisdaskalakis apathwayforprotectivequenchinginantennaproteinsofphotosystemii AT sotirispapadatos pathwayforprotectivequenchinginantennaproteinsofphotosystemii AT antreasccharalambous pathwayforprotectivequenchinginantennaproteinsofphotosystemii AT vangelisdaskalakis pathwayforprotectivequenchinginantennaproteinsofphotosystemii
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A pathway for protective quenching in antenna proteins of Photosystem II

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