title: Plasmodium falciparum: functional mitochondrial ADP/ATP transporter in Escherichia coli plasmic membrane as a tool for selective drug screening.
abstract: Plasmodium falciparum mitochondrial ADP/ATP transporter or adenylate translocase (PfAdT) was previously characterised at the molecular level and intracellularly located by immuno-electromicroscopy. Inhibition of this transporter blocks parasite development in erythrocytes. In this study, PfAdT was expressed in C43 (DE3) Escherichia coli strain under isopropyl beta-d-thiogalacto-pyranoside (IPTG) induction to screen inhibitory molecules. PfAdT was integrated directly into the bacterial cytoplasmic membrane. Whereas IPTG-induced bacterial cells imported radioactively labelled ATP, non-induced cells did not. The transporter bound specifically ADP and ATP, but not AMP. IPTG-induced cells preloaded with labelled ATP exported ATP after exogenous addition of unlabelled ADP or ATP, indicating a counter exchange transport mechanism. Bongrekic acid and atractyloside, two well-known specific inhibitors of mitochondrial ADP/ATP transporter, were tested. This experimental model was evaluated using three Malagasy crude plants extracts which have shown antiplasmodial activity on in vitro parasite cultures.
authors.affiliation: Biologie Fonctionnelle des Protozoaires, USM504-EA3335, Département Régulations, Développement, Diversité Moléculaire, Muséum National d'Histoire Naturelle, 61 rue Buffon, 75005 Paris, France.
authors.forename: Valérie
authors.initials: V
authors.lastname: Razakantoanina
authors.forename: Isabelle
authors.initials: I
authors.lastname: Florent
authors.forename: Ginette
authors.initials: G
authors.lastname: Jaureguiberry
mesh_terms: D000818:Animals; D000962:Antimalarials / Q000494:pharmacology*; D001278:Atractyloside / Q000494:pharmacology; D015153:Blotting, Western; D001865:Bongkrekic Acid / Q000494:pharmacology; D002462:Cell Membrane / Q000201:enzymology; D002478:Cells, Cultured; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004912:Erythrocytes / Q000469:parasitology; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic; D000226:Mitochondrial ADP, ATP Translocases / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism*; D010936:Plant Extracts / Q000494:pharmacology; D010963:Plasmodium falciparum / Q000187:drug effects* / Q000201:enzymology* / Q000254:growth & development; D011994:Recombinant Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D013379:Substrate Specificity
chemical_list: D000962:Antimalarials; D004791:Enzyme Inhibitors; D010936:Plant Extracts; D011994:Recombinant Proteins; D001865:Bongkrekic Acid; D001278:Atractyloside; D000226:Mitochondrial ADP, ATP Translocases