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• W2782653721 abstract "Trypanosoma cruzi, the etiologic agent of Chagas disease, undergoes drastic metabolic changes when it transits between a vector and mammalian hosts. Amino acid catabolism leads to the production of ammonium (NH4+), which needs to be detoxified. However, T. cruzi does not possess a urea cycle, and it is unknown how intracellular levels of ammonium are controlled. In this work, we identified an intracellular ammonium transporter of T. cruzi (TcAMT) that localizes to acidic compartments (reservosomes, lysosomes). TcAMT has 11 transmembrane domains and possesses all conserved and functionally important amino acid residues that form the pore in other ammonium transporters. Functional expression in Xenopus oocytes followed by a two-electrode voltage clamp showed an inward current that is NH4+ dependent at a resting membrane potential (Vh ) lower than -120 mV and is not pH dependent, suggesting that TcAMT is not an NH4+/H+ cotransporter but an NH4+ or NH3/H+ transporter. Ablation of TcAMT by clustered regularly interspaced short palindromic repeat analysis with Cas9 (CRISPR-Cas9) resulted in significant defects in epimastigote and amastigote replication, differentiation, and resistance to starvation and osmotic stress. IMPORTANCETrypanosoma cruzi is an important human and animal pathogen and the etiologic agent of Chagas disease. The parasite undergoes drastic changes in its metabolism during its life cycle. Amino acid consumption becomes important in the infective stages and leads to the production of ammonia (NH3), which needs to be detoxified. We report here the identification of an ammonium (NH4+) transporter that localizes to acidic compartments and is important for replication, differentiation, and resistance to starvation and osmotic stress." @default.
• W2782653721 created "2018-01-26" @default.
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• W2782653721 date "2018-02-28" @default.
• W2782653721 modified "2023-09-27" @default.
• W2782653721 title "An Intracellular Ammonium Transporter Is Necessary for Replication, Differentiation, and Resistance to Starvation and Osmotic Stress in Trypanosoma cruzi" @default.
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• W2782653721 doi "https://doi.org/10.1128/msphere.00377-17" @default.
• W2782653721 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5770540" @default.
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