Chloroplasts play a pivotal role in the metabolism of leaf mesophyll cells, functioning as a cellular hub that orchestrates molecular reactions in response to environmental stimuli. These organelles contain complex protein machinery for energy conversion and are indispensable for essential metabolic pathways. Proteins located within the chloroplast envelope membranes facilitate bidirectional communication with the cell and connect essential pathways, thereby influencing acclimation processes to challenging environmental conditions such as temperature fluctuations and light intensity changes. Despite their importance, a comprehensive overview of the impact of envelope-located proteins during acclimation to environmental changes is lacking. Understanding the role of these proteins in acclimation processes could provide insights into enhancing stress tolerance under increasingly challenging environments. This review highlights the significance of envelope-located proteins in plant acclimation.
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http://dx.doi.org/10.1093/jxb/erae436 | DOI Listing |
J Exp Bot
January 2025
Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan USA.
Plastid-localized plastoglobules (PGs) are monolayer lipid droplets typically associated with the outer envelope of thylakoid membranes in chloroplasts. The size and number of PGs can vary significantly in response to different environmental stimuli. Since the early 21st century, a variety of proteins attached to the surface of PGs have been identified and experimentally characterized using advanced biotechnological techniques, revealing their biological functions.
View Article and Find Full Text PDFFunct Integr Genomics
January 2025
The Energy and Resources Institute, Lodi Road, New Delhi, 110003, India.
The major limiting factor of photosynthesis in C3 plants is the enzyme, rubisco which inadequately distinguishes between carbon dioxide and oxygen. To overcome catalytic deficiencies of Rubisco, cyanobacteria utilize advanced protein microcompartments, called the carboxysomes which envelopes the enzymes, Rubisco and Carbonic Anhydrase (CA). These microcompartments facilitate the diffusion of bicarbonate ions which are converted to CO by CA, following in an increase in carbon flux near Rubisco boosting CO fixation process.
View Article and Find Full Text PDFPlants (Basel)
October 2024
Department of Biosphere Sciences and Engineering, The Carnegie Institution for Science, 260 Panama Street, Stanford, CA 94305, USA.
Photosynthetic eukaryotes have metabolic pathways that occur in distinct subcellular compartments. However, because metabolites synthesized in one compartment, including fixed carbon compounds and reductant generated by photosynthetic electron flows, may be integral to processes in other compartments, the cells must efficiently move metabolites among the different compartments. This review examines the various photosynthetic electron flows used to generate ATP and fixed carbon and the trafficking of metabolites in the green alga ; information on other algae and plants is provided to add depth and nuance to the discussion.
View Article and Find Full Text PDFJ Exp Bot
January 2025
University of Kaiserslautern, Plant Physiology, Paul-Ehrlich-Str., D-67663 Kaiserslautern, Germany.
Chloroplasts play a pivotal role in the metabolism of leaf mesophyll cells, functioning as a cellular hub that orchestrates molecular reactions in response to environmental stimuli. These organelles contain complex protein machinery for energy conversion and are indispensable for essential metabolic pathways. Proteins located within the chloroplast envelope membranes facilitate bidirectional communication with the cell and connect essential pathways, thereby influencing acclimation processes to challenging environmental conditions such as temperature fluctuations and light intensity changes.
View Article and Find Full Text PDFPlant Cell
October 2024
Laboratoire de Physiologie Cellulaire et Végétale, Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement, Centre National de la Recherche Scientifique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes; IRIG, CEA-Grenoble, 17 rue des Martyrs; 38000 Grenoble, France.
Diatoms derive from a secondary endosymbiosis event, which occurred when a eukaryotic host cell engulfed a red alga. This led to the formation of a complex plastid enclosed by four membranes: two innermost membranes originating from the red alga chloroplast envelope, and two additional peri- and epiplastidial membranes (PPM, EpM). The EpM is linked to the endoplasmic reticulum (ER).
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