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APOBEC3 family DNA cytosine deaminases provide overlapping defenses against pathogen infections. However, most viruses have elaborate evasion mechanisms such as the HIV-1 Vif protein, which subverts cellular CBF-β and a polyubiquitin ligase complex to neutralize these enzymes. Despite advances in APOBEC3 and Vif biology, a full understanding of this direct host-pathogen conflict has been elusive....
APOBEC3F (A3F) and APOBEC3G (A3G) are DNA cytosine deaminases that potently restrict human immunodeficiency virus type 1 replication when the virus is deprived of its accessory protein Vif (virion infectivity factor). Vif counteracts these restriction factors by recruiting A3F and A3G to an E3 ubiquitin (Ub) ligase complex that mediates their polyubiquitination (polyUb) and proteasomal degradation...
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