The retroviral restriction ability of SAMHD1, but not its deoxynucleotide triphosphohydrolase activity, is regulated by phosphorylation

Tommy E. White, Alberto Brandariz-Nuñez, Jose Carlos Valle-Casuso, Sarah Amie, Laura Anh Nguyen, Baek Kim, Marina Tuzova, Felipe Diaz-Griffero

Research output: Contribution to journalArticle

192 Scopus citations

Abstract

SAMHD1 is a cellular enzyme that depletes intracellular deoxynucleoside triphosphates (dNTPs) and inhibits the ability of retroviruses, notably HIV-1, to infect myeloid cells. Although SAMHD1 is expressed in both cycling and noncycling cells, the antiviral activity of SAMHD1 is limited to noncycling cells. We determined that SAMHD1 is phosphorylated on residue T592 in cycling cells but that this phosphorylation is lost when cells are in a noncycling state. Reverse genetic experiments revealed that SAMHD1 phosphorylated on residue T592 is unable to block retroviral infection, but this modification does not affect the ability of SAMHD1 to decrease cellular dNTP levels. SAMHD1 contains a target motif for cyclin-dependent kinase 1 (cdk1) ( 592TPQK595), and cdk1 activity is required for SAMHD1 phosphorylation. Collectively, these findings indicate that phosphorylation modulates the ability of SAMHD1 to block retroviral infection without affecting its ability to decrease cellular dNTP levels.

Original languageEnglish (US)
Pages (from-to)441-451
Number of pages11
JournalCell Host and Microbe
Volume13
Issue number4
DOIs
StatePublished - Apr 17 2013

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Virology

Fingerprint Dive into the research topics of 'The retroviral restriction ability of SAMHD1, but not its deoxynucleotide triphosphohydrolase activity, is regulated by phosphorylation'. Together they form a unique fingerprint.

  • Cite this