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Identification of the electron donor to flavodiiron proteins in Synechocystis sp. PCC 6803 by in vivo spectroscopy.

Identifieur interne : 000106 ( Main/Exploration ); précédent : 000105; suivant : 000107

Identification of the electron donor to flavodiiron proteins in Synechocystis sp. PCC 6803 by in vivo spectroscopy.

Auteurs : Pierre Sétif [France] ; Ginga Shimakawa [Japon] ; Anja Krieger-Liszkay [France] ; Chikahiro Miyake [Japon]

Source :

RBID : pubmed:32622739

Descripteurs français

English descriptors

Abstract

Flavodiiron proteins (FDPs) of photosynthetic organisms play a photoprotective role by reducing oxygen to water and thus avoiding the accumulation of excess electrons on the photosystem I (PSI) acceptor side under stress conditions. In Synechocystis sp. PCC 6803 grown under high CO2, both FDPs Flv1 and Flv3 are indispensable for oxygen reduction. We performed a detailed in vivo kinetic study of wild-type (WT) and Δflv1/3 strains of Synechocystis using light-induced NADPH fluorescence and near-infrared absorption of iron-sulfur clusters from ferredoxin and the PSI acceptors (FAFB), collectively named FeS. These measurements were performed under conditions where the Calvin-Benson cycle is inactive or poorly activated. Under such conditions, the NADPH decay following a short illumination decays in parallel in both strains and exhibits a time lag which is correlated to the presence of reduced FeS. On the contrary, reduced FeS decays much faster in WT than in Δflv1/3 (13 vs 2 s-1). These data unambiguously show that reduced ferredoxin, or possibly reduced FAFB, is the direct electron donor to the Flv1/Flv3 heterodimer. Evidences for large reduction of (FAFB) and recombination reactions within PSI were also provided by near-infrared absorption. Mutants lacking either the NDH1-L complex, the homolog of complex I of respiration, or the Pgr5 protein show no difference with WT in the oxidation of reduced FeS following a short illumination. These observations question the participation of a significant cyclic electron flow in cyanobacteria during the first seconds of the induction phase of photosynthesis.

DOI: 10.1016/j.bbabio.2020.148256
PubMed: 32622739


Affiliations:


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Le document en format XML

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<term>Mutation (MeSH)</term>
<term>NADP (metabolism)</term>
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<term>Protéines bactériennes (métabolisme)</term>
<term>Protéines à fer non hème (génétique)</term>
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<div type="abstract" xml:lang="en">Flavodiiron proteins (FDPs) of photosynthetic organisms play a photoprotective role by reducing oxygen to water and thus avoiding the accumulation of excess electrons on the photosystem I (PSI) acceptor side under stress conditions. In Synechocystis sp. PCC 6803 grown under high CO
<sub>2</sub>
, both FDPs Flv1 and Flv3 are indispensable for oxygen reduction. We performed a detailed in vivo kinetic study of wild-type (WT) and Δflv1/3 strains of Synechocystis using light-induced NADPH fluorescence and near-infrared absorption of iron-sulfur clusters from ferredoxin and the PSI acceptors (F
<sub>A</sub>
F
<sub>B</sub>
), collectively named FeS. These measurements were performed under conditions where the Calvin-Benson cycle is inactive or poorly activated. Under such conditions, the NADPH decay following a short illumination decays in parallel in both strains and exhibits a time lag which is correlated to the presence of reduced FeS. On the contrary, reduced FeS decays much faster in WT than in Δflv1/3 (13 vs 2 s
<sup>-1</sup>
). These data unambiguously show that reduced ferredoxin, or possibly reduced F
<sub>A</sub>
F
<sub>B</sub>
, is the direct electron donor to the Flv1/Flv3 heterodimer. Evidences for large reduction of (F
<sub>A</sub>
F
<sub>B</sub>
) and recombination reactions within PSI were also provided by near-infrared absorption. Mutants lacking either the NDH1-L complex, the homolog of complex I of respiration, or the Pgr5 protein show no difference with WT in the oxidation of reduced FeS following a short illumination. These observations question the participation of a significant cyclic electron flow in cyanobacteria during the first seconds of the induction phase of photosynthesis.</div>
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<AbstractText>Flavodiiron proteins (FDPs) of photosynthetic organisms play a photoprotective role by reducing oxygen to water and thus avoiding the accumulation of excess electrons on the photosystem I (PSI) acceptor side under stress conditions. In Synechocystis sp. PCC 6803 grown under high CO
<sub>2</sub>
, both FDPs Flv1 and Flv3 are indispensable for oxygen reduction. We performed a detailed in vivo kinetic study of wild-type (WT) and Δflv1/3 strains of Synechocystis using light-induced NADPH fluorescence and near-infrared absorption of iron-sulfur clusters from ferredoxin and the PSI acceptors (F
<sub>A</sub>
F
<sub>B</sub>
), collectively named FeS. These measurements were performed under conditions where the Calvin-Benson cycle is inactive or poorly activated. Under such conditions, the NADPH decay following a short illumination decays in parallel in both strains and exhibits a time lag which is correlated to the presence of reduced FeS. On the contrary, reduced FeS decays much faster in WT than in Δflv1/3 (13 vs 2 s
<sup>-1</sup>
). These data unambiguously show that reduced ferredoxin, or possibly reduced F
<sub>A</sub>
F
<sub>B</sub>
, is the direct electron donor to the Flv1/Flv3 heterodimer. Evidences for large reduction of (F
<sub>A</sub>
F
<sub>B</sub>
) and recombination reactions within PSI were also provided by near-infrared absorption. Mutants lacking either the NDH1-L complex, the homolog of complex I of respiration, or the Pgr5 protein show no difference with WT in the oxidation of reduced FeS following a short illumination. These observations question the participation of a significant cyclic electron flow in cyanobacteria during the first seconds of the induction phase of photosynthesis.</AbstractText>
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<Keyword MajorTopicYN="Y">NADPH fluorescence</Keyword>
<Keyword MajorTopicYN="Y">NDH-1L complex</Keyword>
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<CoiStatement>Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.</CoiStatement>
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<name sortKey="Setif, Pierre" sort="Setif, Pierre" uniqKey="Setif P" first="Pierre" last="Sétif">Pierre Sétif</name>
</region>
<name sortKey="Krieger Liszkay, Anja" sort="Krieger Liszkay, Anja" uniqKey="Krieger Liszkay A" first="Anja" last="Krieger-Liszkay">Anja Krieger-Liszkay</name>
</country>
<country name="Japon">
<region name="Île-de-France">
<name sortKey="Shimakawa, Ginga" sort="Shimakawa, Ginga" uniqKey="Shimakawa G" first="Ginga" last="Shimakawa">Ginga Shimakawa</name>
</region>
<name sortKey="Miyake, Chikahiro" sort="Miyake, Chikahiro" uniqKey="Miyake C" first="Chikahiro" last="Miyake">Chikahiro Miyake</name>
</country>
</tree>
</affiliations>
</record>

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EXPLOR_STEP=$WICRI_ROOT/Bois/explor/IronSulferCluV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000106 | SxmlIndent | more

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Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Bois
   |area=    IronSulferCluV1
   |flux=    Main
   |étape=   Exploration
   |type=    RBID
   |clé=     pubmed:32622739
   |texte=   Identification of the electron donor to flavodiiron proteins in Synechocystis sp. PCC 6803 by in vivo spectroscopy.
}}

Pour générer des pages wiki

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Data generation: Sat Nov 21 15:13:39 2020. Site generation: Sat Nov 21 15:14:05 2020