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Interactome Analysis of ClpX Reveals Its Regulatory Role in Metabolism and Photosynthesis in Cyanobacteria.
J Proteome Res
April 2024
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
Protein homeostasis is essential for cyanobacteria to maintain proper cellular function under adverse and fluctuating conditions. The AAA+ superfamily of proteolytic complexes in cyanobacteria plays a critical role in this process, including ClpXP, which comprises a hexameric ATPase ClpX and a tetradecameric peptidase ClpP. Despite the physiological effects of ClpX on growth and photosynthesis, its potential substrates and underlying mechanisms in cyanobacteria remain unknown.
View Article and Find Full Text PDFCBSX2 is required for the efficient oxidation of chloroplast redox-regulated enzymes in darkness.
Plant Direct
November 2023
Shanghai Collaborative Innovation Center of Plant Germplasm Resources Development, College of Life Sciences Shanghai Normal University Shanghai China.
Thiol/disulfide-based redox regulation in plant chloroplasts is essential for controlling the activity of target proteins in response to light signals. One of the examples of such a role in chloroplasts is the activity of the chloroplast ATP synthase (CFCF), which is regulated by the redox state of the CFγ subunit and involves two cysteines in its central domain. To investigate the mechanism underlying the oxidation of CFγ and other chloroplast redox-regulated enzymes in the dark, we characterized the Arabidopsis mutant, which was isolated based on its altered NPQ (non-photochemical quenching) induction upon illumination.
View Article and Find Full Text PDFHigh Affinity Electrostatic Interactions Support the Formation of CdS Quantum Dot:Nitrogenase MoFe Protein Complexes.
Nano Lett
November 2023
Institute of Biological Chemistry, Washington State University, Pullman, Washington 99163, United States.
Article Synopsis
- Researchers found that coupling nitrogenase MoFe protein with CdS nanocrystals (NCs) can enhance photocatalytic nitrogen reduction.
- * Their study used microscale thermophoresis to analyze how different sizes of 3-mercaptopropionate capped CdS quantum dots (QDs) bind to MoFe protein.
- * The binding interactions were mainly electrostatic and were stronger for smaller QDs, which is crucial for optimizing catalytic rates in these biohybrid systems.
Thylakoid Rhodanese-like Protein-Ferredoxin:NADP Oxidoreductase Interaction Is Integrated into Plant Redox Homeostasis System.
Antioxidants (Basel)
October 2023
Laboratory for Molecular Plant Biology and Biotechnology, Division of Molecular Biology, Institute Ruđer Bošković, Bijenička cesta 54, HR-10000 Zagreb, Croatia.
In vascular plants, the final photosynthetic electron transfer from ferredoxin (Fd) to NADP is catalyzed by the flavoenzyme ferredoxin:NADP oxidoreductase (FNR). FNR is recruited to thylakoid membranes via an integral membrane protein TROL (thylakoid rhodanese-like protein) and the membrane associated protein Tic62. We have previously demonstrated that the absence of TROL triggers a very efficient superoxide (O) removal mechanism.
View Article and Find Full Text PDFAdaptation of the late ISC pathway in the anaerobic mitochondrial organelles of Giardia intestinalis.
PLoS Pathog
October 2023
Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Průmyslová Vestec, Czech Republic.
Mitochondrial metabolism is entirely dependent on the biosynthesis of the [4Fe-4S] clusters, which are part of the subunits of the respiratory chain. The mitochondrial late ISC pathway mediates the formation of these clusters from simpler [2Fe-2S] molecules and transfers them to client proteins. Here, we characterized the late ISC pathway in one of the simplest mitochondria, mitosomes, of the anaerobic protist Giardia intestinalis that lost the respiratory chain and other hallmarks of mitochondria.
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