HIV-1 Vif binds to APOBEC3G mRNA and inhibits its translation

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HIV-1 Vif binds to APOBEC3G mRNA and inhibits its translation

The HIV-1 viral infectivity factor (Vif) allows productive infection of non-permissive cells (including most natural HIV-1 targets) by counteracting the cellular cytosine deaminases APOBEC-3G (hA3G) and hA3F. The Vif-induced degradation of these restriction factors by the proteasome has been extensively studied, but little is known about the translational repression of hA3G and hA3F by Vif, whi...

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Translational regulation of APOBEC3G mRNA by Vif requires its 5′UTR and contributes to restoring HIV-1 infectivity

The essential HIV-1 viral infectivity factor (Vif) allows productive infection of non-permissive cells expressing cytidine deaminases APOBEC3G (A3G) and A3F by decreasing their cellular level, and preventing their incorporation into virions. Unlike the Vif-induced degradation of A3G, the functional role of the inhibition of A3G translation by Vif remained unclear. Here, we show that two stem-lo...

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Different interaction between HIV-1 Vif and its cellular target proteins APOBEC3G/APOBEC3F.

We examined a series of site-directed point mutants of human immunodeficiency virus type 1 (HIV-1) Vif for their interaction with cellular anti-viral factors APOBEC3G/APOBEC3F. Mutant viruses that display growth-defect in H9 cells did not counteract effectively APOBEC3G and/or APOBEC3F without exception, as monitored by single-cycle infectivity assays. While growth-defective mutants of Vif C-te...

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Polyubiquitination of APOBEC3G is essential for its degradation by HIV-1 Vif.

Proteasomal degradation of APOBEC3G is a critical step for human immunodeficiency virus type 1 (HIV-1) replication. However, the necessity for polyubiquitination of APOBEC3G in this process is still controversial. In this study, we showed that although macaque simian immunodeficiency virus (SIVmac) Vif is more stable than HIV-1 Vif in human cells, SIVmac Vif induces degradation of APBOEC3G as e...

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ژورنال

عنوان ژورنال: Nucleic Acids Research

سال: 2009

ISSN: 1362-4962,0305-1048

DOI: 10.1093/nar/gkp1009