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NUP98 is one of the major components of the NPC, being involved in the RNA export pathway by interacting with several transport factors. Previous studies have suggested both proviral and antiviral functions of NUP98 in viral infection, yet little is known about its function in orthoflavivirus infection. In this study we show that NUP98 is a proviral cellular protein that is recruited to the cytoplasm during orthoflavivirus infection. We observe that NUP98 is found specifically in the vicinity of the replication vesicles during infections with tick-borne encephalitis virus, Japanese encephalitis virus, and yellow fever virus. Furthermore, using surface plasmon resonance, cross-link immunoprecipitation, and cross-link immunoprecipitation-sequencing we observe that the C-terminal domain of NUP98 directly interacts with a conserved site of the viral RNA (vRNA) in the E coding region promoting viral replication. We identified a peptide that binds to NUP98 that is antivirally active against several orthoflaviviruses by outcompeting the binding between NUP98 and vRNA, making NUP98 an attractive target for antiviral development.<\/jats:p>","DOI":"10.1093\/nar\/gkag027","type":"journal-article","created":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T12:49:50Z","timestamp":1767962990000},"source":"Crossref","is-referenced-by-count":2,"title":["NUP98 regulates orthoflavivirus replication through interaction with vRNA and can be targeted for antiviral purposes"],"prefix":"10.1093","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8994-0864","authenticated-orcid":false,"given":"Marie B A","family":"Peters","sequence":"first","affiliation":[{"name":"Department of Clinical Microbiology, Ume\u00e5 University , 90185 Ume\u00e5 ,","place":["Sweden"]},{"name":"Laboratory for Molecular Infection Medicine Sweden (MIMS), Ume\u00e5 University , 90187 Ume\u00e5 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