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SAMHD1 is active in cycling cells permissive to HIV-1 infection.

Abstract：

:SAMHD1 is a triphosphohydrolase that restricts HIV-1 by limiting the intracellular dNTP pool required for reverse transcription. Although SAMHD1 is expressed and active/unphosphorylated in most cell lines, its restriction activity is thought to be relevant only in non-cycling cells. However, an in depth evaluation of SAMHD1 function and relevance in cycling cells is required. Here, we show that SAMHD1-induced degradation by HIV-2 Vpx affects the dNTP pool and HIV-1 replication capacity in the presence of the 3'-azido-3'-deoxythymidine (AZT) in cycling cells. Similarly, in SAMHD1 knockout cells, HIV-1 showed increased replicative capacity in the presence of nucleoside inhibitors, especially AZT, that was reverted by re-expression of wild type SAMHD1. Sensitivity to non-nucleoside inhibitors (nevirapine and efavirenz) or the integrase inhibitor raltegravir was not affected by SAMHD1. Combination of three mutations (S18A, T21A, T25A) significantly prevented SAMHD1 phosphorylation but did not significantly affect HIV-1 replication in the presence of AZT. Our results demonstrate that SAMHD1 is active in HIV-1 permissive cells, does not modify susceptibility to HIV-1 infection but strongly affects sensitivity to nucleoside inhibitors.

journal_name

Antiviral Res

journal_title

Antiviral research

authors

Badia R,Pujantell M,Torres-Torronteras J,Menéndez-Arias L,Martí R,Ruzo A,Pauls E,Clotet B,Ballana E,Esté JA,Riveira-Muñoz E

doi

10.1016/j.antiviral.2017.03.019

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

123-135

eissn

0166-3542

issn

1872-9096

pii

S0166-3542(16)30677-5

journal_volume

142

pub_type

杂志文章

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