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pubmed-article:2384921pubmed:abstractTextAlterations in either the E1 or the E2 glycoprotein of Sindbis virus can affect pathogenesis in animals. Previously, we identified two distinct E1 glycoprotein gene sequences which differed in their effect on pathogenesis. One had an attenuation phenotype following subcutaneous inoculation of neonatal mice (E1 Ala-72, Gly-75, and Ser-237), while the other was virulent (E1 Val-72, Asp-75, and Ala-237). In this study, we examined the basis for this difference in pathogenesis by using a full-length cDNA clone of Sindbis virus from which infectious RNA could be transcribed in vitro. The relative contribution of each E1 residue to the pathogenesis phenotype was determined by using site-directed mutagenesis to alter each codon individually and in combination. Residues 75 and 237, in combination, appeared to be the major E1 determinants affecting pathogenesis. In addition, the effect of directly combining independently attenuating E1 and E2 mutations in the same virus was examined. The attenuating E1 sequences characterized in this study were coupled to a previously characterized attenuating mutation at E2 residue 114. The resulting recombinant virus, constructed in vitro, exhibited an increased attenuation of neurovirulence as compared with recombinant viruses containing either of the attenuating elements alone.lld:pubmed
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pubmed-article:2384921pubmed:authorpubmed-author:JohnstonR ERElld:pubmed
pubmed-article:2384921pubmed:authorpubmed-author:PoloJ MJMlld:pubmed
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pubmed-article:2384921pubmed:articleTitleAttenuating mutations in glycoproteins E1 and E2 of Sindbis virus produce a highly attenuated strain when combined in vitro.lld:pubmed
pubmed-article:2384921pubmed:affiliationDepartment of Microbiology and Immunology, University of North Carolina, Chapel Hill 27599.lld:pubmed
pubmed-article:2384921pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2384921pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:2384921pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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