{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T05:02:26Z","timestamp":1784091746306,"version":"3.55.0"},"update-to":[{"DOI":"10.1371\/journal.ppat.1011281","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2023,4,12]],"date-time":"2023-04-12T00:00:00Z","timestamp":1681257600000}}],"reference-count":78,"publisher":"Public Library of Science (PLoS)","issue":"3","license":[{"start":{"date-parts":[[2023,3,31]],"date-time":"2023-03-31T00:00:00Z","timestamp":1680220800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100010269","name":"Wellcome Trust","doi-asserted-by":"publisher","award":["09095\/Z\/10\/Z"],"award-info":[{"award-number":["09095\/Z\/10\/Z"]}],"id":[{"id":"10.13039\/100010269","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010269","name":"Wellcome Trust","doi-asserted-by":"publisher","award":["221521\/Z\/20\/Z"],"award-info":[{"award-number":["221521\/Z\/20\/Z"]}],"id":[{"id":"10.13039\/100010269","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100021082","name":"Birkbeck, University of London","doi-asserted-by":"publisher","award":["Birkbeck Anniversary Scholarship"],"award-info":[{"award-number":["Birkbeck Anniversary Scholarship"]}],"id":[{"id":"10.13039\/501100021082","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plospathogens.org"],"crossmark-restriction":false},"short-container-title":["PLoS Pathog"],"abstract":"<jats:p>During the blood stage of a malaria infection, malaria parasites export both soluble and membrane proteins into the erythrocytes in which they reside. Exported proteins are trafficked via the parasite endoplasmic reticulum and secretory pathway, before being exported across the parasitophorous vacuole membrane into the erythrocyte. Transport across the parasitophorous vacuole membrane requires protein unfolding, and in the case of membrane proteins, extraction from the parasite plasma membrane. We show that trafficking of the exported<jats:italic>Plasmodium<\/jats:italic>protein, Pf332, differs from that of canonical eukaryotic soluble-secreted and transmembrane proteins. Pf332 is initially ER-targeted by an internal hydrophobic sequence that unlike a signal peptide, is not proteolytically removed, and unlike a transmembrane segment, does not span the ER membrane. Rather, both termini of the hydrophobic sequence enter the ER lumen and the ER-lumenal species is a productive intermediate for protein export. Furthermore, we show in intact cells, that two other exported membrane proteins, SBP1 and MAHRP2, assume a lumenal topology within the parasite secretory pathway. Although the addition of a C-terminal ER-retention sequence, recognised by the lumenal domain of the KDEL receptor, does not completely block export of SBP1 and MAHRP2, it does enhance their retention in the parasite ER. This indicates that a sub-population of each protein adopts an ER-lumenal state that is an intermediate in the export process. Overall, this suggests that although many exported proteins traverse the parasite secretory pathway as typical soluble or membrane proteins, some exported proteins that are ER-targeted by a transmembrane segment-like, internal, non-cleaved hydrophobic segment, do not integrate into the ER membrane, and form an ER-lumenal species that is a productive export intermediate. This represents a novel means, not seen in typical membrane proteins found in model systems, by which exported transmembrane-like proteins can be targeted and trafficked within the lumen of the secretory pathway.<\/jats:p>","DOI":"10.1371\/journal.ppat.1011281","type":"journal-article","created":{"date-parts":[[2023,3,31]],"date-time":"2023-03-31T18:19:13Z","timestamp":1680286753000},"page":"e1011281","update-policy":"https:\/\/doi.org\/10.1371\/journal.ppat.corrections_policy","source":"Crossref","is-referenced-by-count":6,"title":["Formation of ER-lumenal intermediates during export of Plasmodium proteins containing transmembrane-like hydrophobic sequences"],"prefix":"10.1371","volume":"19","author":[{"given":"Yvette S.","family":"Levray","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bianca","family":"Bana","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah J.","family":"Tarr","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emilia J.","family":"McLaughlin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Rossi-Smith","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anita","family":"Waltho","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Georgina H.","family":"Charlton","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Riccardo Zenezini","family":"Chiozzi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Colin R.","family":"Straton","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Konstantinos","family":"Thalassinos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8525-5464","authenticated-orcid":true,"given":"Andrew R.","family":"Osborne","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2023,3,31]]},"reference":[{"issue":"4","key":"ppat.1011281.ref001","doi-asserted-by":"crossref","first-page":"e1009394","DOI":"10.1371\/journal.ppat.1009394","article-title":"Transport mechanisms at the malaria parasite-host cell interface","volume":"17","author":"JR Beck","year":"2021","journal-title":"PLoS Pathog"},{"key":"ppat.1011281.ref002","doi-asserted-by":"crossref","first-page":"901864","DOI":"10.3389\/fimmu.2022.901864","article-title":"Mechanisms for Host Immune Evasion Mediated by Plasmodium falciparum-Infected Erythrocyte Surface Antigens","volume":"13","author":"A Sakoguchi","year":"2022","journal-title":"Front Immunol"},{"issue":"3","key":"ppat.1011281.ref003","doi-asserted-by":"crossref","first-page":"610","DOI":"10.1016\/j.cell.2016.07.055","article-title":"Malaria: Biology and Disease","volume":"167","author":"AF Cowman","year":"2016","journal-title":"Cell"},{"issue":"4","key":"ppat.1011281.ref004","doi-asserted-by":"crossref","first-page":"e13009","DOI":"10.1111\/cmi.13009","article-title":"Illuminating how malaria parasites export proteins into host erythrocytes","volume":"21","author":"KM Matthews","year":"2019","journal-title":"Cell Microbiol"},{"issue":"4","key":"ppat.1011281.ref005","doi-asserted-by":"crossref","DOI":"10.1128\/MMBR.00013-19","article-title":"Host Cytoskeleton Remodeling throughout the Blood Stages of Plasmodium falciparum","volume":"83","author":"JD Warncke","year":"2019","journal-title":"Microbiol Mol Biol Rev"},{"key":"ppat.1011281.ref006","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1016\/j.mib.2016.04.013","article-title":"Protein trafficking in apicomplexan parasites: crossing the vacuolar Rubicon","volume":"32","author":"K. 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