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<dc:title xml:lang="fr">GcpE, une cible pour le développement de nouveaux agents antibactériens : mécanisme catalytique et inhibition</dc:title>
<dcterms:alternative xml:lang="en">GcpE, a target for the development of new antibacterial agents : catalytic mechanism and inhibition</dcterms:alternative>
<dc:subject xml:lang="fr">GcpE</dc:subject>
<dc:subject xml:lang="fr">IspG</dc:subject>
<dc:subject xml:lang="fr">Métalloenzyme</dc:subject>
<dc:subject xml:lang="fr">Voie du méthylérythritol phosphate (la voie du MEP)</dc:subject>
<dc:subject xml:lang="fr">Mécanisme catalytique</dc:subject>
<dc:subject xml:lang="fr">Inhibition enzymatique</dc:subject>
<dc:subject xml:lang="fr">Résistance aux antibiotiques</dc:subject>
<dc:subject xml:lang="en">GcpE</dc:subject>
<dc:subject xml:lang="en">IspG</dc:subject>
<dc:subject xml:lang="en">Metalloenzyme</dc:subject>
<dc:subject xml:lang="en">Methylerythritol phosphate pathway (MEP pathway)</dc:subject>
<dc:subject xml:lang="en">Catalytic mechanism</dc:subject>
<dc:subject xml:lang="en">Enzyme inhibition</dc:subject>
<dc:subject xml:lang="en">Antibiotic resistance</dc:subject>
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<dcterms:abstract xml:lang="fr">Les isoprénoïdes remplissent diverses fonctions biologiques dont certaines sont cruciales pour la survie de tous les organismes. Ils sont biosynthétisés à partir de deux précurseurs, le diphosphate d'isopentényle (IPP) et le diphosphate de diméthylallyle (DMAPP), qui sont fournis par deux voies métaboliques différentes : la voie du mévalonate et la voie du méthylérythritol phosphate (MEP). Contrairement aux humains qui utilisent la voie du mévalonate pour la synthèse de l'IPP et du DMAPP, la majorité des bactéries pathogènes et certains parasites utilisent la voie du MEP, faisant ainsi des enzymes de la voie du MEP des cibles intéressantes pour le développement de nouveaux antibiotiques.La métalloenzyme GcpE, également appelée IspG, appartient à la voie du MEP et a été étudiée. Cette enzyme contient un centre [4Fe 4S]2+ très sensible à l’oxygène. Une méthode a été mise au point permettant de produire et de purifier GcpE d'Escherichia coli sous forme d’holoenzyme. Des essais enzymatiques de GcpE d’E. coli en présence d’outils moléculaires conçus à partir du mécanisme hypothétique de GcpE ont permis d'identifier les premiers inhibiteurs basés sur le mécanisme et les premiers inhibiteurs irréversibles de GcpE. Ces derniers ouvrent la voie vers le développement d’agents antibactériens innovants.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Isoprenoids fulfil various biological functions, some of which are crucial for the survival of all organisms. They are biosynthesised from the two precursors isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP) that are provided by two different pathways: the mevalonate pathway and the methylerythritol phosphate (MEP) pathway. While humans utilise the mevalonate pathway for the synthesis of IPP and DMAPP, the majority of pathogenic bacteria and some parasites rely on the MEP pathway, making the enzymes of the MEP pathway interesting targets for the development of new antibiotics.The metalloenzyme GcpE, also known as IspG, belongs to the MEP pathway and was investigated. GcpE contains an oxygen sensitive [4Fe 4S]2+ cluster. A method was developed that allows to produce and purify GcpE from Escherichia coli in the form of the holoenzyme. Subsequent enzymatic assays performed with GcpE from E. coli in presence of molecular tools which were designed based on the hypothetical mechanism of GcpE lead to the identification of the first mechanism-based and the first irreversible inhibitors of GcpE. These latter open the door to development of innovative antibacterial agents.</dcterms:abstract>
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