{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T08:24:37Z","timestamp":1772958277478,"version":"3.50.1"},"reference-count":58,"publisher":"American Society for Microbiology","issue":"21","license":[{"start":{"date-parts":[[2010,11,1]],"date-time":"2010-11-01T00:00:00Z","timestamp":1288569600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["J Virol"],"published-print":{"date-parts":[[2010,11]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n          <jats:p>\n            Cells and mice infected with arthropod-borne flaviviruses produce a small subgenomic RNA that is colinear with the distal part of the viral 3\u2032-untranslated region (UTR). This small subgenomic flavivirus RNA (sfRNA) results from the incomplete degradation of the viral genome by the host 5\u2032-3\u2032 exonuclease XRN1. Production of the sfRNA is important for the pathogenicity of the virus. This study not only presents a detailed description of the yellow fever virus (YFV) sfRNA but, more importantly, describes for the first time the molecular characteristics of the stalling site for XRN1 in the flavivirus genome. Similar to the case for West Nile virus, the YFV sfRNA was produced by XRN1. However, in contrast to the case for other arthropod-borne flaviviruses, not one but two sfRNAs were detected in YFV-infected mammalian cells. The smaller of these two sfRNAs was not observed in infected mosquito cells. The larger sfRNA could also be produced\n            <jats:italic>in vitro<\/jats:italic>\n            by incubation with purified XRN1. These two YFV sfRNAs formed a 5\u2032-nested set. The 5\u2032 ends of the YFV sfRNAs were found to be just upstream of the previously predicted RNA pseudoknot PSK3. RNA structure probing and mutagenesis studies provided strong evidence that this pseudoknot structure was formed and served as the molecular signal to stall XRN1. The sequence involved in PSK3 formation was cloned into the Sinrep5 expression vector and shown to direct the production of an sfRNA-like RNA. These results underscore the importance of the RNA pseudoknot in stalling XRN1 and also demonstrate that it is the sole viral requirement for sfRNA production.\n          <\/jats:p>","DOI":"10.1128\/jvi.01047-10","type":"journal-article","created":{"date-parts":[[2010,8,26]],"date-time":"2010-08-26T01:52:55Z","timestamp":1282787575000},"page":"11395-11406","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":158,"title":["An RNA Pseudoknot Is Required for Production of Yellow Fever Virus Subgenomic RNA by the Host Nuclease XRN1"],"prefix":"10.1128","volume":"84","author":[{"given":"Patri\u0301cia A. G. C.","family":"Silva","sequence":"first","affiliation":[{"name":"Department of Medical Microbiology, Center of Infectious Diseases, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, Netherlands"}]},{"given":"Carina F.","family":"Pereira","sequence":"additional","affiliation":[{"name":"Department of Medical Microbiology, Center of Infectious Diseases, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, Netherlands"}]},{"given":"Tim J.","family":"Dalebout","sequence":"additional","affiliation":[{"name":"Department of Medical Microbiology, Center of Infectious Diseases, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, Netherlands"}]},{"given":"Willy J. M.","family":"Spaan","sequence":"additional","affiliation":[{"name":"Department of Medical Microbiology, Center of Infectious Diseases, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, Netherlands"}]},{"given":"Peter J.","family":"Bredenbeek","sequence":"additional","affiliation":[{"name":"Department of Medical Microbiology, Center of Infectious Diseases, Leiden University Medical Center, P.O. 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