title: Mutations in the feline immunodeficiency virus envelope glycoprotein confer resistance to a dominant-negative fragment of Tsg101 by enhancing infectivity and cell-to-cell virus transmission.
abstract: The Pro-Ser-Ala-Pro (PSAP) motif in the p2 domain of feline immunodeficiency virus (FIV) Gag is required for efficient virus release, virus replication, and Gag binding to the ubiquitin-E2-variant (UEV) domain of Tsg101. As a result of this direct interaction, expression of an N-terminal fragment of Tsg101 containing the UEV domain (referred to as TSG-5') inhibits FIV release. In these respects, the FIV p2(Gag) PSAP motif is analogous to the PTAP motif of HIV-1 p6(Gag). To evaluate the feasibility of a late domain-targeted inhibition of virus replication, we created an enriched Crandell-Rees feline kidney (CRFK) cell line (T5'(hi)) that stably expresses high levels of TSG-5'. Here we show that mutations in either the V3 loop or the second heptad repeat (HR2) domain of the FIV envelope glycoprotein (Env) rescue FIV replication in T5'(hi) cells without increasing FIV release efficiency. TSG-5'-resistance mutations in Env enhance virion infectivity and the cell-cell spread of FIV when diffusion is limited using a semi-solid growth medium. These findings show that mutations in functional domains of Env confer TSG-5'-resistance, which we propose enhances specific infectivity and the cell-cell transmission of virus to counteract inefficient virus release. This article is part of a Special Issue entitled: Viral Membrane Proteins-Channels for Cellular Networking.
authors.affiliation: Virus-Cell Interaction Section, HIV Drug Resistance Program, National Cancer Institute-Frederick, Frederick, MD 21702, USA.
authors.forename: Benjamin G
authors.initials: BG
authors.lastname: Luttge
authors.affiliation: Virus-Cell Interaction Section, HIV Drug Resistance Program, National Cancer Institute-Frederick, Frederick, MD 21702, USA.
authors.forename: Prashant
authors.initials: P
authors.lastname: Panchal
authors.affiliation: Virus-Cell Interaction Section, HIV Drug Resistance Program, National Cancer Institute-Frederick, Frederick, MD 21702, USA.
authors.forename: Vinita
authors.initials: V
authors.lastname: Puri
authors.affiliation: Virus-Cell Interaction Section, HIV Drug Resistance Program, National Cancer Institute-Frederick, Frederick, MD 21702, USA.
authors.forename: Mary Ann
authors.initials: MA
authors.lastname: Checkley
authors.affiliation: Virus-Cell Interaction Section, HIV Drug Resistance Program, National Cancer Institute-Frederick, Frederick, MD 21702, USA. Electronic address: efreed@nih.gov.
authors.forename: Eric O
authors.initials: EO
authors.lastname: Freed
mesh_terms: D000818:Animals; D002415:Cats; D002478:Cells, Cultured; D004268:DNA-Binding Proteins / Q000502:physiology*; D056827:Endosomal Sorting Complexes Required for Transport / Q000502:physiology*; D016089:Immunodeficiency Virus, Feline / Q000472:pathogenicity*; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D010446:Peptide Fragments / Q000502:physiology*; D014157:Transcription Factors / Q000502:physiology*; D014759:Viral Envelope Proteins / Q000502:physiology*; D000099177:Tsg101 Protein
chemical_list: D004268:DNA-Binding Proteins; D056827:Endosomal Sorting Complexes Required for Transport; D010446:Peptide Fragments; D014157:Transcription Factors; D014759:Viral Envelope Proteins; D000099177:Tsg101 Protein
keywords: AIDS; Cell-to-cell virus transmission; ESCRT; FIV; HIV-1; Late domain; TSG-5' resistance; Tsg101
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