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• W3016937194 endingPage "e1008487" @default.
• W3016937194 startingPage "e1008487" @default.
• W3016937194 abstract "Most simian immunodeficiency viruses use Nef to counteract the tetherin proteins of their nonhuman primate hosts. Nef also downmodulates cell-surface CD4 and MHC class I (MHC I) molecules and enhances viral infectivity by counteracting SERINC5. We previously demonstrated that tetherin antagonism by SIV Nef is genetically separable from CD4- and MHC I-downmodulation. Here we show that disruption of tetherin antagonism by Nef impairs virus replication during acute SIV infection of rhesus macaques. A combination of mutations was introduced into the SIVmac239 genome resulting in three amino acid substitutions in Nef that impair tetherin antagonism, but not CD3-, CD4- or MHC I-downmodulation. Further characterization of this mutant (SIVmac239AAA) revealed that these changes also result in partial sensitivity to SERINC5. Separate groups of four rhesus macaques were infected with either wild-type SIVmac239 or SIVmac239AAA, and viral RNA loads in plasma and sequence changes in the viral genome were monitored. Viral loads were significantly lower during acute infection in animals infected with SIVmac239AAA than in animals infected with wild-type SIVmac239. Sequence analysis of the virus population in plasma confirmed that the substitutions in Nef were retained during acute infection; however, changes were observed by week 24 post-infection that fully restored anti-tetherin activity and partially restored anti-SERINC5 activity. These observations reveal overlap in the residues of SIV Nef required for counteracting tetherin and SERINC5 and selective pressure to overcome these restriction factors in vivo." @default.
• W3016937194 created "2020-04-24" @default.
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• W3016937194 date "2020-04-17" @default.
• W3016937194 modified "2023-09-27" @default.
• W3016937194 title "Loss of tetherin antagonism by Nef impairs SIV replication during acute infection of rhesus macaques" @default.
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• W3016937194 doi "https://doi.org/10.1371/journal.ppat.1008487" @default.
• W3016937194 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7190186" @default.
• W3016937194 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32302364" @default.
• W3016937194 hasPublicationYear "2020" @default.
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