{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T11:31:58Z","timestamp":1777375918016,"version":"3.51.4"},"reference-count":88,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2022,11,30]],"date-time":"2022-11-30T00:00:00Z","timestamp":1669766400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000925","name":"National Health and Medical Research Council","doi-asserted-by":"publisher","award":["APP2001073"],"award-info":[{"award-number":["APP2001073"]}],"id":[{"id":"10.13039\/501100000925","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell. Infect. Microbiol."],"abstract":"<jats:p>The cation efflux pump <jats:italic>Plasmodium falciparum<\/jats:italic> ATPase 4 (<jats:italic>Pf<\/jats:italic>ATP4) maintains Na<jats:sup>+<\/jats:sup> homeostasis in malaria parasites and has been implicated in the mechanism of action of many structurally diverse antimalarial agents, including &amp;gt;7% of the antimalarial compounds in the Medicines for Malaria Venture\u2019s \u2018Malaria Box\u2019 and \u2018Pathogen Box\u2019. Recent screens of the \u2018Malaria Box\u2019 and \u2018Pathogen Box\u2019 revealed that many <jats:italic>Pf<\/jats:italic>ATP4 inhibitors prevent parasites from exiting their host red blood cell (egress) or entering new host cells (invasion), suggesting that these compounds may have additional molecular targets involved in egress or invasion. Here, we demonstrate that five <jats:italic>Pf<\/jats:italic>ATP4 inhibitors reduce egress but not invasion. These compounds appear to inhibit egress by blocking the activation of protein kinase G, an enzyme that, once stimulated, rapidly activates parasite egress. We establish a direct link between egress and <jats:italic>Pf<\/jats:italic>ATP4 function by showing that the inhibition of egress is attenuated in a Na<jats:sup>+<\/jats:sup>-depleted environment and in parasites with a mutation in <jats:italic>pfatp4<\/jats:italic>. Finally, we show that <jats:italic>Pf<\/jats:italic>ATP4 inhibitors induce host cell lysis when administered prior to the completion of parasite replication. Since host cell lysis mimics egress but is not followed by invasion, this phenomenon likely explains why several <jats:italic>Pf<\/jats:italic>ATP4 inhibitors were previously classified as invasion inhibitors. Collectively, our results confirm that <jats:italic>Pf<\/jats:italic>ATP4-mediated Na<jats:sup>+<\/jats:sup> efflux is critical to the regulation of parasite egress.<\/jats:p>","DOI":"10.3389\/fcimb.2022.1060202","type":"journal-article","created":{"date-parts":[[2022,11,30]],"date-time":"2022-11-30T04:39:13Z","timestamp":1669783153000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":15,"title":["PfATP4 inhibitors in the Medicines for Malaria Venture Malaria Box and Pathogen Box block the schizont-to-ring transition by inhibiting egress rather than invasion"],"prefix":"10.3389","volume":"12","author":[{"given":"Claudia B. 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