Alternative photosynthesis pathways drive the algal CO2-concentrating mechanism

Burlacot, Adrien; Dao, Ousmane; Auroy, Pascaline; Cuiné, Stéphan; Li‐Beisson, Yonghua; Peltier, Gilles

doi:10.1038/s41586-022-04662-9

Cited by 108 publications

(107 citation statements)

References 61 publications

(59 reference statements)

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“…In particular, metabolic pathways involving malate shuttles increased in the mutant such as the tricarboxylic acid cycle (TCA) and the glyoxylate pathway [ 77 ]. Malate shuttles, combined with other signaling factors, play a putative role in algal CO 2 -concentrating mechanisms (CCM) [ 82 , 83 ]. In relation to this, it can be noticed that CP12 increases in low CO 2 conditions in T. pseudonana , conditions that trigger CCM [ 84 ].…”

Section: One Gene One Protein Many Functionsmentioning

confidence: 99%

A Trajectory of Discovery: Metabolic Regulation by the Conditionally Disordered Chloroplast Protein, CP12

et al. 2022

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The chloroplast protein CP12, which is widespread in photosynthetic organisms, belongs to the intrinsically disordered proteins family. This small protein (80 amino acid residues long) presents a bias in its composition; it is enriched in charged amino acids, has a small number of hydrophobic residues, and has a high proportion of disorder-promoting residues. More precisely, CP12 is a conditionally disordered proteins (CDP) dependent upon the redox state of its four cysteine residues. During the day, reducing conditions prevail in the chloroplast, and CP12 is fully disordered. Under oxidizing conditions (night), its cysteine residues form two disulfide bridges that confer some stability to some structural elements. Like many CDPs, CP12 plays key roles, and its redox-dependent conditional disorder is important for the main function of CP12: the dark/light regulation of the Calvin-Benson-Bassham (CBB) cycle responsible for CO2 assimilation. Oxidized CP12 binds to glyceraldehyde-3-phosphate dehydrogenase and phosphoribulokinase and thereby inhibits their activity. However, recent studies reveal that CP12 may have other functions beyond the CBB cycle regulation. In this review, we report the discovery of this protein, its features as a disordered protein, and the many functions this small protein can have.

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Section: One Gene One Protein Many Functionsmentioning

confidence: 99%

A Trajectory of Discovery: Metabolic Regulation by the Conditionally Disordered Chloroplast Protein, CP12

et al. 2022

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“…Therefore, these kinetics are directly related to chlorophyll fluorescence quenching, rather than other nonquenching processes that affect chlorophyll fluorescence. This phenomenon of decreasing NPQ during the light has been previously attributed to the consumption of the proton gradient by the activity of the CO 2 concentration mechanism (CCM) (Burlacot et al, 2022). In addition to the effect arising from CCM, state transition via the induction of State 1 could also play some role in the NPQ decrease observed during HL periods, though this would not contribute during the first HL period in which cells are already in State 1 (following far-red acclimation).…”

Section: Varying Light Fluctuation Periods Affect the Dynamic Npq Res...mentioning

confidence: 81%

Interplay between LHCSR proteins and state transitions governs the NPQ response in Chlamydomonas during light fluctuations

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Burlacot

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et al. 2022

Plant Cell & Environment

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Photosynthetic organisms use sunlight as the primary energy source to fix CO 2 .However, in nature, light energy is highly variable, reaching levels of saturation for periods ranging from milliseconds to hours. In the green microalga Chlamydomonas reinhardtii, safe dissipation of excess light energy by nonphotochemical quenching (NPQ) is mediated by light-harvesting complex stressrelated (LHCSR) proteins and redistribution of light-harvesting antennae between the photosystems (state transition). Although each component

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“…Specific activities of the mitochondria were shown to be involved in the maintenance of the balance between energy, carbon, and nutrients in fluctuating environments, thereby directly optimizing photosynthesis [ 14 , 15 , 16 ]. In addition, chloroplasts also possess the ability to activate mitochondrial functions to help energy synthesis [ 17 ]. Furthermore, the mechanisms to adjust morphology and internal energy states in response to changes in environments rely on an internal capacity to sense environmental situations and to process this information [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms Regulating Energy Homeostasis in Plant Cells and Their Potential to Inspire Electrical Microgrids Models

et al. 2022

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In this paper, the main features of systems that are required to flexibly modulate energy states of plant cells in response to environmental fluctuations are surveyed and summarized. Plant cells possess multiple sources (chloroplasts and mitochondria) to produce energy that is consumed to drive many processes, as well as mechanisms that adequately provide energy to the processes with high priority depending on the conditions. Such energy-providing systems are tightly linked to sensors that monitor the status of the environment and inside the cell. In addition, plants possess the ability to efficiently store and transport energy both at the cell level and at a higher level. Furthermore, these systems can finely tune the various mechanisms of energy homeostasis in plant cells in response to the changes in environment, also assuring the plant survival under adverse environmental conditions. Electrical power systems are prone to the effects of environmental changes as well; furthermore, they are required to be increasingly resilient to the threats of extreme natural events caused, for example, by climate changes, outages, and/or external deliberate attacks. Starting from this consideration, similarities between energy-related processes in plant cells and electrical power grids are identified, and the potential of mechanisms regulating energy homeostasis in plant cells to inspire the definition of new models of flexible and resilient electrical power grids, particularly microgrids, is delineated. The main contribution of this review is surveying energy regulatory mechanisms in detail as a reference and helping readers to find useful information for their work in this research field.

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Alternative photosynthesis pathways drive the algal CO2-concentrating mechanism

Abstract: Author contributions: A.B. and G.P. designed the research; A.B., O.D., P.A., S.C., and G.P. performed research; A.B. and G.P. contributed new reagents/analytic tools; A.B. and G.P. analyzed data; A.B. and G.P. wrote the paper with inputs from Y.L.-B.

Cited by 108 publications

References 61 publications

A Trajectory of Discovery: Metabolic Regulation by the Conditionally Disordered Chloroplast Protein, CP12

A Trajectory of Discovery: Metabolic Regulation by the Conditionally Disordered Chloroplast Protein, CP12

Interplay between LHCSR proteins and state transitions governs the NPQ response in Chlamydomonas during light fluctuations

Mechanisms Regulating Energy Homeostasis in Plant Cells and Their Potential to Inspire Electrical Microgrids Models

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