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In this study, we corroborate that the SARS-CoV-2 non-structural proteins 3 and 4 (nsp3 and nsp4) suffice to remodel the endoplasmic reticulum to form double-membrane vesicles similar to ROs observed in viral infection. Cellular membrane alterations induced by nsp3\/4 expression were evaluated through electron tomography and confocal microscopy, and nsp3\/4-associated host factors were identified using mass spectrometry. The role of these host factors in virus infection was determined using gene silencing, identifying several host proteins involved in the SARS-CoV-2 replication cycle. Combining the gene silencing approach with ultrastructural analysis of nsp3\/4-expressing cells, we found that the host dependency factors FAM149B1, CCAR2, and ZC3HAV1 play a role in the formation of double-membrane vesicles in a replication-independent manner.<\/jats:p>\n                  <jats:sec>\n                    <jats:title>IMPORTANCE<\/jats:title>\n                    <jats:p>Remodeling of the cellular endomembrane system by viruses allows for efficient and coordinated replication of the viral genome in distinct subcellular compartments termed replication organelles. As a critical step in the viral life cycle, replication organelle formation is an attractive target for therapeutic intervention, but factors central to this process are only partially understood. In this study, we corroborate that two viral proteins, nsp3 and nsp4, are the major drivers of membrane remodeling in SARS-CoV-2 infection. We further report a number of host cell factors interacting with these viral proteins and supporting the viral replication cycle, some of them by contributing to the formation of the SARS-CoV-2 replication organelle.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1128\/jvi.00878-23","type":"journal-article","created":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T09:01:10Z","timestamp":1698742870000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":22,"title":["Identification of host dependency factors involved in SARS-CoV-2 replication organelle formation through proteomics and ultrastructural analysis"],"prefix":"10.1128","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7445-2259","authenticated-orcid":true,"given":"Felix","family":"Pahmeier","sequence":"first","affiliation":[{"name":"Department of Infectious Diseases, Molecular Virology, Heidelberg University, Medical Faculty Heidelberg, 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