ChloroPlantRedoxV1, Main, Exploration, bibRecord, 000128

Probing the electric field across thylakoid membranes in cyanobacteria.

Identifieur interne : 000128 ( Main/Exploration ); précédent : 000127; suivant : 000129

Probing the electric field across thylakoid membranes in cyanobacteria.

Auteurs : Stefania Viola [France, Royaume-Uni] ; Benjamin Bailleul [France] ; Jianfeng Yu [Royaume-Uni] ; Peter Nixon [Royaume-Uni] ; Julien Sellés [France] ; Pierre Joliot [France] ; Francis-André Wollman [France]

Source :

Proceedings of the National Academy of Sciences of the United States of America [ 1091-6490 ] ; 2019.

RBID : pubmed:31591197

Descripteurs français

KwdFr :
- Complexe protéique du photosystème I (métabolisme), Photosynthèse (MeSH), Plastocyanine (métabolisme), Potentiels de membrane (MeSH), Synechococcus (métabolisme), Thylacoïdes (métabolisme), Transport d'électrons (MeSH), Électrophysiologie (MeSH).
MESH :
- métabolisme : Complexe protéique du photosystème I, Plastocyanine, Synechococcus, Thylacoïdes.
- Photosynthèse, Potentiels de membrane, Transport d'électrons, Électrophysiologie.

English descriptors

KwdEn :
- Electron Transport (MeSH), Electrophysiology (MeSH), Membrane Potentials (MeSH), Photosynthesis (MeSH), Photosystem I Protein Complex (metabolism), Plastocyanin (metabolism), Synechococcus (metabolism), Thylakoids (metabolism).
MESH :
- chemical , metabolism : Photosystem I Protein Complex, Plastocyanin.
- metabolism : Synechococcus, Thylakoids.
- Electron Transport, Electrophysiology, Membrane Potentials, Photosynthesis.

Abstract

In plants, algae, and some photosynthetic bacteria, the ElectroChromic Shift (ECS) of photosynthetic pigments, which senses the electric field across photosynthetic membranes, is widely used to quantify the activity of the photosynthetic chain. In cyanobacteria, ECS signals have never been used for physiological studies, although they can provide a unique tool to study the architecture and function of the respiratory and photosynthetic electron transfer chains, entangled in the thylakoid membranes. Here, we identified bona fide ECS signals, likely corresponding to carotenoid band shifts, in the model cyanobacteria Synechococcus elongatus PCC7942 and Synechocystis sp. PCC6803. These band shifts, most likely originating from pigments located in photosystem I, have highly similar spectra in the 2 species and can be best measured as the difference between the absorption changes at 500 to 505 nm and the ones at 480 to 485 nm. These signals respond linearly to the electric field and display the basic kinetic features of ECS as characterized in other organisms. We demonstrate that these probes are an ideal tool to study photosynthetic physiology in vivo, e.g., the fraction of PSI centers that are prebound by plastocyanin/cytochrome c₆ in darkness (about 60% in both cyanobacteria, in our experiments), the conductivity of the thylakoid membrane (largely reflecting the activity of the ATP synthase), or the steady-state rates of the photosynthetic electron transport pathways.

DOI: 10.1073/pnas.1913099116
PubMed: 31591197
PubMed Central: PMC6815183

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Main, to step Corpus: 000104
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Le document en format XML

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<term>Photosystem I Protein Complex (metabolism)</term>
<term>Plastocyanin (metabolism)</term>
<term>Synechococcus (metabolism)</term>
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<term>Électrophysiologie (MeSH)</term>
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<front><div type="abstract" xml:lang="en">In plants, algae, and some photosynthetic bacteria, the ElectroChromic Shift (ECS) of photosynthetic pigments, which senses the electric field across photosynthetic membranes, is widely used to quantify the activity of the photosynthetic chain. In cyanobacteria, ECS signals have never been used for physiological studies, although they can provide a unique tool to study the architecture and function of the respiratory and photosynthetic electron transfer chains, entangled in the thylakoid membranes. Here, we identified bona fide ECS signals, likely corresponding to carotenoid band shifts, in the model cyanobacteria <i>Synechococcus elongatus</i>
 PCC7942 and <i>Synechocystis sp.</i>
 PCC6803. These band shifts, most likely originating from pigments located in photosystem I, have highly similar spectra in the 2 species and can be best measured as the difference between the absorption changes at 500 to 505 nm and the ones at 480 to 485 nm. These signals respond linearly to the electric field and display the basic kinetic features of ECS as characterized in other organisms. We demonstrate that these probes are an ideal tool to study photosynthetic physiology in vivo, e.g., the fraction of PSI centers that are prebound by plastocyanin/cytochrome <i>c</i>
<sub><i>6</i>
</sub>
 in darkness (about 60% in both cyanobacteria, in our experiments), the conductivity of the thylakoid membrane (largely reflecting the activity of the ATP synthase), or the steady-state rates of the photosynthetic electron transport pathways.</div>
</front>
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<Abstract><AbstractText>In plants, algae, and some photosynthetic bacteria, the ElectroChromic Shift (ECS) of photosynthetic pigments, which senses the electric field across photosynthetic membranes, is widely used to quantify the activity of the photosynthetic chain. In cyanobacteria, ECS signals have never been used for physiological studies, although they can provide a unique tool to study the architecture and function of the respiratory and photosynthetic electron transfer chains, entangled in the thylakoid membranes. Here, we identified bona fide ECS signals, likely corresponding to carotenoid band shifts, in the model cyanobacteria <i>Synechococcus elongatus</i>
 PCC7942 and <i>Synechocystis sp.</i>
 PCC6803. These band shifts, most likely originating from pigments located in photosystem I, have highly similar spectra in the 2 species and can be best measured as the difference between the absorption changes at 500 to 505 nm and the ones at 480 to 485 nm. These signals respond linearly to the electric field and display the basic kinetic features of ECS as characterized in other organisms. We demonstrate that these probes are an ideal tool to study photosynthetic physiology in vivo, e.g., the fraction of PSI centers that are prebound by plastocyanin/cytochrome <i>c</i>
<sub><i>6</i>
</sub>
 in darkness (about 60% in both cyanobacteria, in our experiments), the conductivity of the thylakoid membrane (largely reflecting the activity of the ATP synthase), or the steady-state rates of the photosynthetic electron transport pathways.</AbstractText>
</Abstract>
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	Serveur d'exploration sur les chloroplastes dans l'oxydoréduction chez les plantes
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Serveur d'exploration sur les chloroplastes dans l'oxydoréduction chez les plantes

Probing the electric field across thylakoid membranes in cyanobacteria.

Probing the electric field across thylakoid membranes in cyanobacteria.

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