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To better understand the autophagy process, we investigated Plasmodium falciparum Atg18 (PfAtg18), a PROPPIN family protein, whose members like S. cerevisiae Atg18 (ScAtg18) and human WIPI2 bind PI3P and play an essential role in autophagosome formation. Wild type and mutant PfAtg18 were expressed in P. falciparum and assessed for localization, the effect of various inhibitors and antimalarials on PfAtg18 localization, and identification of PfAtg18-interacting proteins. PfAtg18 is expressed in asexual erythrocytic stages and localized to the food vacuole, which was also observed with other Plasmodium Atg18 proteins, indicating that food vacuole localization is likely a shared feature. Interaction of PfAtg18 with the food vacuole-associated PI3P is essential for localization, as PfAtg18 mutants of PI3P-binding motifs neither bound PI3P nor localized to the food vacuole. Interestingly, wild type ScAtg18 interacted with PI3P, but its expression in P. falciparum showed complete cytoplasmic localization, indicating additional requirement for food vacuole localization. The food vacuole multi-drug resistance protein 1 (MDR1) was consistently identified in the immunoprecipitates of PfAtg18 and P. berghei Atg18, and also interacted with PfAtg18. In contrast with PfAtg18, ScAtg18 did not interact with MDR1, which, in addition to PI3P, could play a critical role in localization of PfAtg18. Chloroquine and amodiaquine caused cytoplasmic localization of PfAtg18, suggesting that these target PfAtg18 transport pathway. Thus, PI3P and MDR1 are critical mediators of PfAtg18 localization.<\/jats:p>","DOI":"10.1042\/bcj20210001","type":"journal-article","created":{"date-parts":[[2021,4,12]],"date-time":"2021-04-12T17:43:56Z","timestamp":1618249436000},"page":"1705-1732","update-policy":"https:\/\/doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["<i>Plasmodium falciparum<\/i> Atg18 localizes to the food vacuole via interaction with the multi-drug resistance protein 1 and phosphatidylinositol 3-phosphate"],"prefix":"10.1042","volume":"478","author":[{"given":"Renu","family":"Sudhakar","sequence":"first","affiliation":[{"name":"CSIR-Centre for Cellular and Molecular Biology, Hyderabad 500007, TS, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Divya","family":"Das","sequence":"additional","affiliation":[{"name":"CSIR-Centre for Cellular and Molecular Biology, Hyderabad 500007, TS, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Subramanian","family":"Thanumalayan","sequence":"additional","affiliation":[{"name":"CSIR-Centre for Cellular and Molecular Biology, Hyderabad 500007, TS, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Somesh","family":"Gorde","sequence":"additional","affiliation":[{"name":"CSIR-Centre for Cellular and Molecular Biology, Hyderabad 500007, TS, India"},{"name":"Academy of Scientific and Innovative Research, Ghaziabad 201002, UP, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6956-6454","authenticated-orcid":false,"given":"Puran Singh","family":"Sijwali","sequence":"additional","affiliation":[{"name":"CSIR-Centre for Cellular and Molecular Biology, Hyderabad 500007, TS, India"},{"name":"Academy of Scientific and Innovative Research, Ghaziabad 201002, UP, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"288","published-online":{"date-parts":[[2021,5,10]]},"reference":[{"key":"2021051014100053100_BCJ-2021-0001C1","doi-asserted-by":"publisher","first-page":"814","DOI":"10.1038\/ncb0910-814","article-title":"Eaten alive: a history of macroautophagy","volume":"12","year":"2010","journal-title":"Nat. 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