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111.
Julien Henri Marie-Eve Chagot Maxime Bourguet Yoann Abel Guillaume Terral Chloé Maurizy Christelle Aigueperse Florian Georgescauld Franck Vandermoere Rénette Saint-Fort Isabelle Behm-Ansmant Bruno Charpentier Bérengère Pradet-Balade Céline Verheggen Edouard Bertrand Philippe Meyer Sarah Cianférani Xavier Manival Marc Quinternet 《Structure (London, England : 1993)》2018,26(9):1196-1209.e8
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Combining reverse genetics and nuclear magnetic resonance‐based metabolomics unravels trypanosome‐specific metabolic pathways
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Frédéric Bringaud Marc Biran Yoann Millerioux Marion Wargnies Stefan Allmann Muriel Mazet 《Molecular microbiology》2015,96(5):917-926
Numerous eukaryotes have developed specific metabolic traits that are not present in extensively studied model organisms. For instance, the procyclic insect form of Trypanosoma brucei, a parasite responsible for sleeping sickness in its mammalian‐specific bloodstream form, metabolizes glucose into excreted succinate and acetate through pathways with unique features. Succinate is primarily produced from glucose‐derived phosphoenolpyruvate in peroxisome‐like organelles, also known as glycosomes, by a soluble NADH‐dependent fumarate reductase only described in trypanosomes so far. Acetate is produced in the mitochondrion of the parasite from acetyl‐CoA by a CoA‐transferase, which forms an ATP‐producing cycle with succinyl‐CoA synthetase. The role of this cycle in ATP production was recently demonstrated in procyclic trypanosomes and has only been proposed so far for anaerobic organisms, in addition to trypanosomatids. We review how nuclear magnetic resonance spectrometry can be used to analyze the metabolic network perturbed by deletion (knockout) or downregulation (RNAi) of the candidate genes involved in these two particular metabolic pathways of procyclic trypanosomes. The role of succinate and acetate production in trypanosomes is discussed, as well as the connections between the succinate and acetate branches, which increase the metabolic flexibility probably required by the parasite to deal with environmental changes such as oxidative stress. 相似文献
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Microarrays are particular biosensors with multiple grafted probes that are generally used for parallel and simultaneous detection of various targets. In this study, we used microarrays with aptamer probes in order to follow up the different biomolecular interactions of a single enzyme, the thrombin protein, involved in the complex coagulation cascade. More precisely, thanks to label-free surface plasmon resonance imaging, we were able to monitor in real time an important step in the firing of the coagulation cascade in situ—the enzymatic transformation of prothrombin into thrombin, catalyzed by factor Xa. We were also able to appraise the influence of other biochemical factors and their corresponding inhibiting or enhancing behaviors on thrombin activation. Our study opens the door for the development of a complete microarray-based platform not only for the whole coagulation cascade analysis but also for novel drug screening assays in pharmacology. 相似文献
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Salimata Bagayoko Stephen Adonai Leon-Icaza Miriam Pinilla Audrey Hessel Karin Santoni David Pricat Pierre-Jean Bordignon Flavie Moreau Elif Eren Aurlien Boyanc Emmanuelle Naser Lise Lefvre Cline Berrone Nino Iakobachvili Arnaud Metais Yoann Rombouts Geanncarlo Lugo-Villarino Agns Coste Ina Attre Dara W. Frank Hans Clevers Peter J. Peters Cline Cougoule Rmi Plans Etienne Meunier 《PLoS pathogens》2021,17(9)
Regulated cell necrosis supports immune and anti-infectious strategies of the body; however, dysregulation of these processes drives pathological organ damage. Pseudomonas aeruginosa expresses a phospholipase, ExoU that triggers pathological host cell necrosis through a poorly characterized pathway. Here, we investigated the molecular and cellular mechanisms of ExoU-mediated necrosis. We show that cellular peroxidised phospholipids enhance ExoU phospholipase activity, which drives necrosis of immune and non-immune cells. Conversely, both the endogenous lipid peroxidation regulator GPX4 and the pharmacological inhibition of lipid peroxidation delay ExoU-dependent cell necrosis and improve bacterial elimination in vitro and in vivo. Our findings also pertain to the ExoU-related phospholipase from the bacterial pathogen Burkholderia thailandensis, suggesting that exploitation of peroxidised phospholipids might be a conserved virulence mechanism among various microbial phospholipases. Overall, our results identify an original lipid peroxidation-based virulence mechanism as a strong contributor of microbial phospholipase-driven pathology. 相似文献
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Philip J.M. Brouwer Mitch Brinkkemper Pauline Maisonnasse Nathalie Dereuddre-Bosquet Marloes Grobben Mathieu Claireaux Marlon de Gast Romain Marlin Virginie Chesnais Ségolène Diry Joel D. Allen Yasunori Watanabe Julia M. Giezen Gius Kerster Hannah L. Turner Karlijn van der Straten Cynthia A. van der Linden Yoann Aldon Rogier W. Sanders 《Cell》2021,184(5):1188-1200.e19
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118.
Jean-Michel Escoffre Chloé Mauroy Thomas Portet Luc Wasungu Chrystelle Rosazza Yoann Gilbart Laetitia Mallet Elisabeth Bellard Muriel Golzio Marie-Pierre Rols Justin Teissié 《Biophysical reviews》2009,1(4)
Electropulsation is one of the nonviral methods successfully used to deliver genes into living cells in vitro and in vivo. This approach shows promise in the field of gene and cellular therapies. The present review focuses on the processes supporting gene electrotransfer in vitro. In the first part, we will report the events occurring before, during, and after pulse application in the specific field of plasmid DNA electrotransfer at the cell level. A critical discussion of the present theoretical considerations about membrane electropermeabilization and the transient structures involved in the plasmid uptake follows in a second part. 相似文献
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Yoann Lussier Pierre Bissonnette Daniel G. Bichet Jean-Yves Lapointe 《The Journal of membrane biology》2010,236(2):225-232
Myo-inositol (MI; hexahydroxycyclohexane, C6H6O12) is a small neutral molecule used as a compatible osmolyte in the kidney medulla. At high concentrations, MI appears to act
as a chemical chaperone and was shown to promote plasma membrane expression of the impaired cystic fibrosis chloride channel
(Δ508-CFTR). In the present study, we measured whether MI could increase expression of two human aquaporin 2 (AQP2) mutants
which were recently identified as causing nephrogenic diabetes insipidus (NDI). Both proteins (D150E and G196D) were expressed
in Xenopus laevis oocytes, but only D150E displayed an increase in oocyte water permeability (P
f). Adding 5 mM MI to the bathing solution for 24 h produced a 50% increase in the D150E-associated P
f, while it had no effect on noninjected oocytes or on oocytes expressing wt-AQP2 or G196D. Western blots performed on purified
plasma membrane preparations confirmed that MI increased the amount of D150E present at the plasma membrane, while G196D was
always undetectable. X. laevis oocytes are remarkably impermeable to MI, and the effect of MI on D150E expression does not require the presence of intracellular
MI. The effect of external MI was dose-dependent (K
0.5 was 130 μM) and specific with respect to other forms of inositols. Further studies on a second group of AQP2 mutants causing
NDI showed that K228E activity was similarly stimulated by MI, while V71M, A70D and S256L were not. It is concluded that physiological
concentrations of extracellular MI can stimulate the expression of a specific subgroup of AQP2 mutants. 相似文献
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