Photosynthetic Processes and Mechanisms

Variance in Calvin-Benson cycle intermediate levels between closely-related species in the tomato clade

The paper profiles Calvin-Benson cycle intermediates in five closely-related tomato species, finding significant variance that reflects lineage-specific adaptations and phylogenetic relatedness.

Assembly of two functionally-distinct protein import complexes in the outer membrane of plant chloroplasts

The paper characterizes two distinct TOC complexes in chloroplasts and non-photosynthetic plastids, revealing differences in receptor composition and Toc75's central role in assembly.

Towards a standard approach to investigating the Thermal Load Sensitivity of photosystem II via chlorophyll fluorescence

The paper develops a protocol to assess thermal load sensitivity of photosystem II in plants by integrating temperature intensity and exposure duration, showing dose-dependent effects and light intensity impacts on tolerance thresholds.

A Conserved Mechanism for Positioning Ferredoxin NADP+ Reductase at Photosystem I in Green Algae

This study identifies a conserved mechanism in green algae where FNR is tethered to PSI-LHCI via Lhca4's N-terminal helix, revealing spatial regulation of electron transfer.

Estimation of chloroplast macromolecular complex copy numbers and subunit stoichiometries during the Chlamydomonas reinhardtii cell cycle

The paper quantifies protein abundances and stoichiometries in Chlamydomonas reinhardtii during the cell cycle using the total protein approach.

Enhanced carotenoid photoprotection in Far-Red light acclimated Chroococcidiopsis thermalis

This paper investigates how Chroococcidiopsis thermalis acclimates to far-red light, finding enhanced photoprotective mechanisms involving carotenoids and chlorophylls.

Septin-mediated coupling of protein import and division during chloroplast evolution

This study identifies SEP1, a septin in Chlamydomonas reinhardtii, as a coordinator of chloroplast protein import and division, showing its evolutionary conservation and functional interaction with TOC GTPases.

A conserved photosynthetic cytochrome enhances growth of Chlamydomonas reinhardtii in fluctuating light

This study shows that cytochrome c6A enhances growth of Chlamydomonas reinhardtii under fluctuating light by maintaining light harvesting balance between photosystems I and II.

Cryo-EM structures of photosystem I with alternative quinones reveals new insight into cofactor selectivity

The paper presents cryo-EM structures of Photosystem I with alternative quinones, revealing asymmetry in quinone binding and exchange.

The Role of Phosphoenolpyruvate Carboxylase-Protein Kinase in C4 Photosynthesis: Insights from Zea mays Mutant Analysis

This study examines the impact of PEPC phosphorylation by PEPC-PK in Zea mays mutants, finding that while phosphorylation affects in vitro enzyme sensitivity to malate, it does not significantly alter photosynthetic performance or growth under field conditions.

The new role of carbonic anhydrases and bicarbonate in acclimatization and hypoxia stress responses in Arabidopsis thaliana

This study shows that overexpressing βCAs and PsbS in Arabidopsis improves stress tolerance but reduces biomass, while bicarbonate treatment enhances biomass in triple transgenic lines.

PIFI Stabilizes Chloroplast NDH-PSI Supercomplex to Maintain Plastoquinone Redox Balance and PSII Efficiency

This study shows that PIFI stabilizes the NDH-PSI supercomplex, maintaining plastoquinone redox balance and PSII efficiency in chloroplasts.

Maturase K forms a plastidial splicing complex with a neofunctionalized branching enzyme

The paper identifies MKIP1 as a plastid-localized protein that interacts with MatK to facilitate chloroplast intron splicing, showing functional divergence from canonical branching enzymes.

Interplay between high-energy quenching and state transitions in Chlamydomonas reinhardtii: a single-cell approach

This study uses single-cell analysis to reveal cell-to-cell heterogeneity and a correlation between high-energy quenching and state transitions in Chlamydomonas reinhardtii under light stress.

Searching α-solenoid proteins involved in organellar gene expression

The paper identifies new α-solenoid proteins involved in chloroplast and mitochondrial gene expression across multiple species using computational methods.

Mitochondrial malate metabolism acts as a control hub for photosynthesis and carbon-nitrogen balance in Arabidopsis

This study shows that mitochondrial malate metabolism regulates photosynthesis and carbon-nitrogen balance in Arabidopsis under low-light conditions.

Form IF Rubiscos include highly active, specific, and small subunit-independent enzymes.

The paper identifies Form IF Rubiscos that are highly active, specific, and function without the small subunit, challenging the necessity of subunit complexity in Rubisco evolution.

Kinase KEY1 controls pyrenoid condensate size throughout the cell cycle by disrupting phase separation interactions

This study identifies the kinase KEY1 as a regulator of pyrenoid condensate size and dynamics in Chlamydomonas reinhardtii, showing it disrupts phase separation interactions to control condensate dissolution during the cell cycle.

Mature Citrus Leaves Undergo Coordinated Photosynthetic Downregulation to Support Flush-Driven Carbon and Nitrogen Sink Demand

This study shows mature citrus leaves reduce photosynthesis to supply carbon and nitrogen to new shoots, challenging the source-sink attenuation hypothesis.

Filament Formation by ChlI Challenges the Current View of Magnesium Chelatase Architecture

This study uses cryo-EM to show that ChlI forms filamentous helical oligomers in the presence of Mg2+ and nucleotides, with ATP-driven assemblies interacting with ChlD and showing subunit compaction.

Simultaneous Overexpression of Three Enzymes of Chloroplast Metabolism Fails to Improve CO2 Assimilation or Biomass.

This study tests overexpressing three chloroplast enzymes in tobacco to boost photosynthesis and biomass but finds no significant improvement under tested conditions.

GTPase-powered progressive contraction of a supramolecular ring driving chloroplast division

This study identifies Dnm2 as the motor driving GTPase-powered contraction of the chloroplast division ring in Cyanidioschzoon merolae, revealing a mechanism for chloroplast fission.

Differential photosynthetic response to phosphate starvation in C3 and C4 Flaveria species

This study compares how C3 and C4 Flaveria species respond to phosphate starvation, finding differences in photosynthetic light reaction regulation and stress responses.

Chloroplast ABC peptide transporters TAP1, NAP8, and ATH12 are essential for heat-induced peptide export and play a key role in thermotolerance in Arabidopsis thaliana.

Xylulose 5-Phosphate/Phosphate Translocator Mediates Carbon Allocation for Anabolic Metabolism in the Chlamydomonas Chloroplast

The paper identifies CreTPT10 as a chloroplast transporter critical for X5P import, showing its role in sustaining chloroplast anabolism and coordinating mitochondrial metabolism under heterotrophic conditions.

Exploring the diversity of the CO2-concentrating mechanism (CCM) in different C4 subtypes

The paper investigates C4 pathway fluxes in three C4 grass subtypes using 13CO2 pulse-chase experiments, revealing that both malate and aspartate contribute to the C4 cycle in all subtypes.

Wheat leaf dark respiration acclimates more strongly at night than in the day when responding to nocturnal warming

This study examines how wheat leaf respiration adapts to nocturnal warming, finding that respiratory rates in the dark decrease while daytime rates remain stable, suggesting improved energy efficiency in modern cultivars.

Loss of FRIENDLY MITOCHONDRIA (FMT) Restores Chloroplast Proteostasis via Inter-organelle Compensation

This study identifies loss of FMT as a suppressor of clpc1 mutant defects, revealing mitochondrial perturbation enables nuclear reprogramming to restore chloroplast proteostasis.

Rubisco Dark Inhibition in Angiosperms Shows a Complex Distribution Pattern

The paper compiles and analyzes data on Rubisco dark inhibition across 157 flowering plant species, revealing a complex distribution pattern and highlighting gaps in current knowledge.

Kinetic Insights into Photoinduced Monomer-Dimer Conversion and Activation of Orange Carotenoid Protein

This study investigates the photo-induced structural transitions and dimerization dynamics of OCP, revealing distinct reaction pathways for monomers and dimers and their impact on photo-reactivity.