National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
United States
Citation
Journal: EMBO Rep / Year: 2021 Title: Structural basis of transport and inhibition of the Plasmodium falciparum transporter PfFNT. Authors: Meinan Lyu / Chih-Chia Su / James W Kazura / Edward W Yu / Abstract: The intra-erythrocyte stage of P. falciparum relies primarily on glycolysis to generate adenosine triphosphate (ATP) and the energy required to support growth and reproduction. Lactic acid, a ...The intra-erythrocyte stage of P. falciparum relies primarily on glycolysis to generate adenosine triphosphate (ATP) and the energy required to support growth and reproduction. Lactic acid, a metabolic byproduct of glycolysis, is potentially toxic as it lowers the pH inside the parasite. Plasmodium falciparum formate-nitrite transporter (PfFNT), a 34-kDa transmembrane protein, has been identified as a novel drug target as it exports lactate from inside the parasite to the surrounding parasitophorous vacuole within the erythrocyte cytosol. The structure and detailed molecular mechanism of this membrane protein are not yet available. Here we present structures of PfFNT in the absence and presence of the functional inhibitor MMV007839 at resolutions of 2.56 Å and 2.78 Å using single-particle cryo-electron microscopy. Genetic analysis and transport assay indicate that PfFNT is able to transfer lactate across the membrane. Combined, our data suggest a stepwise displacement mechanism for substrate transport. The PfFNT membrane protein is capable of picking up lactate ions from the parasite's cytosol, converting them to lactic acids and then exporting these acids into the extracellular space.
History
Deposition
May 19, 2021
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Header (metadata) release
Dec 8, 2021
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Map release
Dec 8, 2021
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Update
May 29, 2024
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Current status
May 29, 2024
Processing site: RCSB / Status: Released
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Structure visualization
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Surface view with section colored by density value
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