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• W2091844054 endingPage "7094" @default.
• W2091844054 startingPage "7081" @default.
• W2091844054 abstract "ABSTRACT The adenovirus type 5 (Ad5) E1B-55K and E4orf6 (E1B-55K/E4orf6) proteins are multifunctional regulators of Ad5 replication, participating in many processes required for virus growth. A complex containing the two proteins mediates the degradation of cellular proteins through assembly of an E3 ubiquitin ligase and induces shutoff of host cell protein synthesis through selective nucleocytoplasmic viral late mRNA export. Both proteins shuttle between the nuclear and cytoplasmic compartments via leucine-rich nuclear export signals (NES). However, the role of their NES-dependent export in viral replication has not been established. It was initially shown that mutations in the E4orf6 NES negatively affect viral late gene expression in transfection/infection complementation assays, suggesting that E1B-55K/E4orf6-dependent viral late mRNA export involves a CRM1 export pathway. However, a different conclusion was drawn from similar studies showing that E1B-55K/E4orf6 promote late gene expression without active CRM1 or functional NES. To evaluate the role of the E1B-55K/E4orf6 NES in viral replication in the context of Ad-infected cells and in the presence of functional CRM1, we generated virus mutants carrying amino acid exchanges in the NES of either or both proteins. Phenotypic analyses revealed that mutations in the NES of E1B-55K and/or E4orf6 had no or only moderate effects on viral DNA replication, viral late protein synthesis, or viral late mRNA export. Significantly, such mutations also did not interfere with the degradation of cellular substrates, indicating that the NES of E1B-55K or E4orf6 is dispensable both for late gene expression and for the activity associated with the E3 ubiquitin ligase." @default.
• W2091844054 created "2016-06-24" @default.
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• W2091844054 date "2011-07-15" @default.
• W2091844054 modified "2023-10-16" @default.
• W2091844054 title "The E3 Ubiquitin Ligase Activity Associated with the Adenoviral E1B-55K–E4orf6 Complex Does Not Require CRM1-Dependent Export" @default.
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• W2091844054 doi "https://doi.org/10.1128/jvi.02368-10" @default.
• W2091844054 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3126608" @default.
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