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• W2912378596 endingPage "e1007533" @default.
• W2912378596 startingPage "e1007533" @default.
• W2912378596 abstract "Retroviruses have evolved multiple means to counteract host restriction factors such as single-stranded DNA-specific deoxycytidine deaminases (APOBEC3s, A3s). These include exclusion of A3s from virions by an A3-unreactive nucleocapsid or expression of an A3-neutralizing protein (Vif, Bet). However, a number of retroviruses package A3s and do not encode apparent vif- or bet-like genes, yet they replicate in the presence of A3s. The mode by which they overcome deleterious restriction remains largely unknown. Here we show that the prototypic betaretrovirus, mouse mammary tumor virus (MMTV), packages similar amounts of A3s as HIV-1ΔVif, yet its proviruses carry a significantly lower level of A3-mediated deamination events than the lentivirus. The G-to-A mutation rate increases when the kinetics of reverse transcription is reduced by introducing a mutation (F120L) to the DNA polymerase domain of the MMTV reverse transcriptase (RT). A similar A3-sensitizing effect was observed when the exposure time of single-stranded DNA intermediates to A3s during reverse transcription was lengthened by reducing the dNTP concentration or by adding suboptimal concentrations of an RT inhibitor to infected cells. Thus, the MMTV RT has evolved to impede access of A3s to transiently exposed minus DNA strands during reverse transcription, thereby alleviating inhibition by A3 family members. A similar mechanism may be used by other retroviruses and retrotransposons to reduce deleterious effects of A3 proteins." @default.
• W2912378596 created "2019-02-21" @default.
• W2912378596 creator A5055147479 @default.
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• W2912378596 date "2019-02-15" @default.
• W2912378596 modified "2023-09-24" @default.
• W2912378596 title "A high rate of polymerization during synthesis of mouse mammary tumor virus DNA alleviates hypermutation by APOBEC3 proteins" @default.
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• W2912378596 doi "https://doi.org/10.1371/journal.ppat.1007533" @default.
• W2912378596 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6395001" @default.
• W2912378596 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30768644" @default.
• W2912378596 hasPublicationYear "2019" @default.
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