{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T07:44:23Z","timestamp":1791877463285,"version":"4.3.4"},"reference-count":131,"publisher":"Public Library of Science (PLoS)","issue":"5","license":[{"start":{"date-parts":[[2022,5,4]],"date-time":"2022-05-04T00:00:00Z","timestamp":1651622400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000923","name":"The Australian Research Council","doi-asserted-by":"crossref","award":["FT160100226"],"award-info":[{"award-number":["FT160100226"]}],"id":[{"id":"10.13039\/501100000923","id-type":"DOI","asserted-by":"crossref"}]},{"name":"The National Health and Medical Research Council","award":["1127338"],"award-info":[{"award-number":["1127338"]}]},{"name":"The National Health and Medical Research Council","award":["1053082"],"award-info":[{"award-number":["1053082"]}]},{"name":"Department of Education, Australian Government"},{"name":"Department of Education, Australian Government"}],"content-domain":{"domain":["www.plosbiology.org"],"crossmark-restriction":false},"short-container-title":["PLoS Biol"],"abstract":"<jats:p>\n                    Polymorphisms in the\n                    <jats:italic>Plasmodium falciparum<\/jats:italic>\n                    multidrug resistance protein 1 (\n                    <jats:italic>pfmdr1<\/jats:italic>\n                    ) gene and the\n                    <jats:italic>Plasmodium falciparum<\/jats:italic>\n                    chloroquine resistance transporter (\n                    <jats:italic>pfcrt<\/jats:italic>\n                    ) gene alter the malaria parasite\u2019s susceptibility to most of the current antimalarial drugs. However, the precise mechanisms by which PfMDR1 contributes to multidrug resistance have not yet been fully elucidated, nor is it understood why polymorphisms in\n                    <jats:italic>pfmdr1<\/jats:italic>\n                    and\n                    <jats:italic>pfcrt<\/jats:italic>\n                    that cause chloroquine resistance simultaneously increase the parasite\u2019s susceptibility to lumefantrine and mefloquine\u2014a phenomenon known as collateral drug sensitivity. Here, we present a robust expression system for PfMDR1 in\n                    <jats:italic>Xenopus<\/jats:italic>\n                    oocytes that enables direct and high-resolution biochemical characterizations of the protein. We show that wild-type PfMDR1 transports diverse pharmacons, including lumefantrine, mefloquine, dihydroartemisinin, piperaquine, amodiaquine, methylene blue, and chloroquine (but not the antiviral drug amantadine). Field-derived mutant isoforms of PfMDR1 differ from the wild-type protein, and each other, in their capacities to transport these drugs, indicating that PfMDR1-induced changes in the distribution of drugs between the parasite\u2019s digestive vacuole (DV) and the cytosol are a key driver of both antimalarial resistance and the variability between multidrug resistance phenotypes. Of note, the PfMDR1 isoforms prevalent in chloroquine-resistant isolates exhibit reduced capacities for chloroquine, lumefantrine, and mefloquine transport. We observe the opposite relationship between chloroquine resistance-conferring mutations in PfCRT and drug transport activity. Using our established assays for characterizing PfCRT in the\n                    <jats:italic>Xenopus<\/jats:italic>\n                    oocyte system and in live parasite assays, we demonstrate that these PfCRT isoforms transport all 3 drugs, whereas wild-type PfCRT does not. We present a mechanistic model for collateral drug sensitivity in which mutant isoforms of PfMDR1 and PfCRT cause chloroquine, lumefantrine, and mefloquine to remain in the cytosol instead of sequestering within the DV. This change in drug distribution increases the access of lumefantrine and mefloquine to their primary targets (thought to be located outside of the DV), while simultaneously decreasing chloroquine\u2019s access to its target within the DV. The mechanistic insights presented here provide a basis for developing approaches that extend the useful life span of antimalarials by exploiting the opposing selection forces they exert upon PfCRT and PfMDR1.\n                  <\/jats:p>","DOI":"10.1371\/journal.pbio.3001616","type":"journal-article","created":{"date-parts":[[2022,5,4]],"date-time":"2022-05-04T13:28:45Z","timestamp":1651670925000},"page":"e3001616","update-policy":"https:\/\/doi.org\/10.1371\/journal.pbio.corrections_policy","source":"Crossref","is-referenced-by-count":62,"title":["Mechanistic basis for multidrug resistance and collateral drug sensitivity conferred to the malaria parasite by polymorphisms in PfMDR1 and PfCRT"],"prefix":"10.1371","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6503-3565","authenticated-orcid":true,"given":"Sarah 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