Jean Alric
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View article: Acclimation of photosynthesis began with a Cu-binding superoxide detoxifying enzyme
Acclimation of photosynthesis began with a Cu-binding superoxide detoxifying enzyme Open
Plant acclimation is a growing scientific concept, at molecular, cellular and global scales. All photosynthetic organisms that created an oxic atmosphere on earth possess a gene of unknown function “ Acclimation of Photosynthesis to the En…
View article: Structural and functional characterization of two conserved lumenal TPM-domain proteins involved in the maturation of Photosystem II
Structural and functional characterization of two conserved lumenal TPM-domain proteins involved in the maturation of Photosystem II Open
Many proteins conserved across oxygenic phototrophs play essential roles in photosynthetic function and acclimation, yet many remain unidentified or poorly characterized. In the green alga Chlamydomonas reinhardtii we identified two paralo…
View article: Participation of the stress‐responsive CDSP32 thioredoxin in the modulation of chloroplast ATP‐synthase activity in <i>Solanum tuberosum</i>
Participation of the stress‐responsive CDSP32 thioredoxin in the modulation of chloroplast ATP‐synthase activity in <i>Solanum tuberosum</i> Open
Plant thioredoxins (TRXs) are involved in numerous metabolic and signalling pathways, such as light‐dependent regulation of photosynthesis. The atypical TRX CDSP32, chloroplastic drought‐induced stress protein of 32 kDa, includes two TRX‐f…
View article: The stromal side of the cytochrome <i>b</i>6<i>f</i> complex regulates state transitions
The stromal side of the cytochrome <i>b</i>6<i>f</i> complex regulates state transitions Open
In oxygenic photosynthesis, state transitions distribute light energy between PSI and PSII. This regulation involves reduction of the plastoquinone pool, activation of the state transitions 7 (STT7) protein kinase by the cytochrome (cyt) b…
View article: <i>In vivo</i>ElectroChromic Shift measurements of photosynthetic activity in far-red absorbing cyanobacteria
<i>In vivo</i>ElectroChromic Shift measurements of photosynthetic activity in far-red absorbing cyanobacteria Open
Some cyanobacteria can do photosynthesis using not only visible but also far-red light that is unused by most other oxygenic photoautotrophs because of its lower energy content. These species have a modified photosynthetic apparatus contai…
View article: Redox regulation by the CDSP32 thioredoxin of ATP-synthase activity and enzymatic antioxidant network in<i>Solanum tuberosum</i>
Redox regulation by the CDSP32 thioredoxin of ATP-synthase activity and enzymatic antioxidant network in<i>Solanum tuberosum</i> Open
Plant thioredoxins (TRXs) form a complex family involved in numerous metabolic and signalling pathways, such as the regulation of photosynthetic metabolism in relation with light conditions. The atypical CDSP32, chloroplastic drought-induc…
View article: The stromal side of cytochrome<i>b</i><sub>6</sub><i>f</i>complex regulates state transitions
The stromal side of cytochrome<i>b</i><sub>6</sub><i>f</i>complex regulates state transitions Open
In oxygenic photosynthesis, state transitions distribute light energy between Photosystem I and Photosystem II. This regulation involves the reduction of the plastoquinone pool, activation of the STT7 protein kinase by cytochrome b 6 f com…
View article: Guanosine tetraphosphate ( <scp>ppGpp</scp> ) accumulation inhibits chloroplast gene expression and promotes super grana formation in the moss <i>Physcomitrium</i> ( <i>Physcomitrella</i> ) <i>patens</i>
Guanosine tetraphosphate ( <span>ppGpp</span> ) accumulation inhibits chloroplast gene expression and promotes super grana formation in the moss <i>Physcomitrium</i> ( <i>Physcomitrella</i> ) <i>patens</i> Open
Summary The nucleotides guanosine tetraphosphate and pentaphosphate (or (p)ppGpp) are implicated in the regulation of chloroplast function in plants. (p)ppGpp signalling is best understood in the model vascular plant Arabidopsis thaliana i…
View article: Interactions Between Carbon Metabolism and Photosynthetic Electron Transport in a Chlamydomonas reinhardtii Mutant Without CO2 Fixation by RuBisCO
Interactions Between Carbon Metabolism and Photosynthetic Electron Transport in a Chlamydomonas reinhardtii Mutant Without CO2 Fixation by RuBisCO Open
A Chlamydomonas reinhardtii RuBisCO-less mutant, Δ rbcL , was used to study carbohydrate metabolism without fixation of atmospheric carbon. The regulatory mechanism(s) that control linear electron flow, known as “photosynthetic control,” a…
View article: Standard units for ElectroChromic Shift measurements in plant biology
Standard units for ElectroChromic Shift measurements in plant biology Open
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View article: ACCLIMATION OF PHOTOSYNTHESIS TO THE ENVIRONMENT 1 regulates Photosystem II Supercomplex dynamics in response to light in<i>Chlamydomonas reinhardtii</i>
ACCLIMATION OF PHOTOSYNTHESIS TO THE ENVIRONMENT 1 regulates Photosystem II Supercomplex dynamics in response to light in<i>Chlamydomonas reinhardtii</i> Open
Photosynthetic organisms require acclimation mechanisms to regulate photosynthesis in response to light conditions. Here, two mutant alleles of ACCLIMATION OF PHOTOSYNTHESIS TO THE ENVIRONMENT 1 ( ape1 ) have been characterized in Chlamydo…
View article: The function of PROTOPORPHYRINOGEN IX OXIDASE in chlorophyll biosynthesis requires oxidised plastoquinone in Chlamydomonas reinhardtii
The function of PROTOPORPHYRINOGEN IX OXIDASE in chlorophyll biosynthesis requires oxidised plastoquinone in Chlamydomonas reinhardtii Open
In the last common enzymatic step of tetrapyrrole biosynthesis, prior to the branching point leading to the biosynthesis of heme and chlorophyll, protoporphyrinogen IX (Protogen) is oxidised to protoporphyrin IX (Proto) by protoporphyrinog…
View article: Structure-Function Analysis of Chloroplast Proteins via Random Mutagenesis Using Error-Prone PCR
Structure-Function Analysis of Chloroplast Proteins via Random Mutagenesis Using Error-Prone PCR Open
Site-directed mutagenesis of chloroplast genes was developed three decades ago and has greatly advanced the field of photosynthesis research. Here, we describe a new approach for generating random chloroplast gene mutants that combines err…
View article: The plastoquinone pool outside the thylakoid membrane serves in plant photoprotection as a reservoir of singlet oxygen scavengers
The plastoquinone pool outside the thylakoid membrane serves in plant photoprotection as a reservoir of singlet oxygen scavengers Open
The Arabidopsis vte1 mutant is devoid of tocopherol and plastochromanol (PC‐8). When exposed to excess light energy, vte1 produced more singlet oxygen ( 1 O 2 ) and suffered from extensive oxidative damage compared with the wild type. Here…
View article: A stromal region of cytochrome <i>b</i> <sub>6</sub> <i>f</i> subunit IV is involved in the activation of the Stt7 kinase in <i>Chlamydomonas</i>
A stromal region of cytochrome <i>b</i> <sub>6</sub> <i>f</i> subunit IV is involved in the activation of the Stt7 kinase in <i>Chlamydomonas</i> Open
Significance Sunlight is a powerful but fluctuating energy source used by photosynthetic organisms as a substrate for biochemistry. To optimize photosynthetic efficiency, the distribution of energy input between the two photosystems is reg…