{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T14:33:12Z","timestamp":1791297192234,"version":"4.1.0"},"reference-count":74,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2011,7,1]],"date-time":"2011-07-01T00:00:00Z","timestamp":1309478400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2011,7,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>The complement system plays a pivotal protective role in the innate immune response to many pathogens including flaviviruses. Flavivirus nonstructural protein 1 (NS1) is a secreted nonstructural glycoprotein that accumulates in plasma to high levels and is displayed on the surface of infected cells but absent from viral particles. Previous work has defined an immune evasion role of flavivirus NS1 in limiting complement activation by forming a complex with C1s and C4 to promote cleavage of C4 to C4b. In this study, we demonstrate a second mechanism, also involving C4 and its active fragment C4b, by which NS1 antagonizes complement activation. Dengue, West Nile, or yellow fever virus NS1 directly associated with C4b binding protein (C4BP), a complement regulatory plasma protein that attenuates the classical and lectin pathways. Soluble NS1 recruited C4BP to inactivate C4b in solution and on the plasma membrane. Mapping studies revealed that the interaction sites of NS1 on C4BP partially overlap with the C4b binding sites. Together, these studies further define the immune evasion potential of NS1 in reducing the functional capacity of C4 in complement activation and control of flavivirus infection.<\/jats:p>","DOI":"10.4049\/jimmunol.1100750","type":"journal-article","created":{"date-parts":[[2011,6,4]],"date-time":"2011-06-04T04:33:58Z","timestamp":1307162038000},"page":"424-433","source":"Crossref","is-referenced-by-count":210,"title":["Binding of Flavivirus Nonstructural Protein NS1 to C4b Binding Protein Modulates Complement Activation"],"prefix":"10.1093","volume":"187","author":[{"given":"Panisadee","family":"Avirutnan","sequence":"first","affiliation":[{"name":"Department of Medicine, Washington University School of Medicine , St. Louis, MO 63110"},{"name":"Dengue Hemorrhagic Fever Research Unit, Office for Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University , Bangkok 10700 ,","place":["Thailand"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard E","family":"Hauhart","sequence":"additional","affiliation":[{"name":"Department of Medicine, Washington University School of Medicine , St. Louis, MO 63110"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pawit","family":"Somnuke","sequence":"additional","affiliation":[{"name":"Department of Medicine, Washington University School of Medicine , St. Louis, MO 63110"},{"name":"Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University , Bangkok 10700 ,","place":["Thailand"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna M","family":"Blom","sequence":"additional","affiliation":[{"name":"Department of Laboratory Medicine Malm\u00f6, Lund University , 20502 Malm\u00f6 ,","place":["Sweden"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael S","family":"Diamond","sequence":"additional","affiliation":[{"name":"Department of Medicine, Washington University School of Medicine , St. Louis, MO 63110"},{"name":"Department of Pathology and Immunology, Washington University School of Medicine , St. Louis, MO 63110"},{"name":"Department of Molecular Microbiology, Washington University School of Medicine , St. Louis, MO 63110"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John P","family":"Atkinson","sequence":"additional","affiliation":[{"name":"Department of Medicine, Washington University School of Medicine , St. Louis, MO 63110"},{"name":"Department of Pathology and Immunology, Washington University School of Medicine , St. Louis, MO 63110"},{"name":"Department of Molecular Microbiology, Washington University School of Medicine , St. Louis, MO 63110"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2011,7,1]]},"reference":[{"key":"2025032410195963300_r1","doi-asserted-by":"crossref","first-page":"I100","DOI":"10.1016\/j.vaccine.2008.11.061","article-title":"Complement and its role in protection and pathogenesis of flavivirus infections","volume":"26","author":"Avirutnan","year":"2008","journal-title":"Vaccine"},{"key":"2025032410195963300_r2","doi-asserted-by":"crossref","first-page":"362","DOI":"10.1016\/j.virol.2010.12.045","article-title":"Complement and viral pathogenesis","volume":"411","author":"Stoermer","year":"2011","journal-title":"Virology"},{"key":"2025032410195963300_r3","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1038\/nrmicro1824","article-title":"Complement evasion by human pathogens","volume":"6","author":"Lambris","year":"2008","journal-title":"Nat. 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