TY - JOUR
T1 - The retroviral restriction ability of SAMHD1, but not its deoxynucleotide triphosphohydrolase activity, is regulated by phosphorylation
AU - White, Tommy E.
AU - Brandariz-Nuñez, Alberto
AU - Valle-Casuso, Jose Carlos
AU - Amie, Sarah
AU - Nguyen, Laura Anh
AU - Kim, Baek
AU - Tuzova, Marina
AU - Diaz-Griffero, Felipe
N1 - Funding Information:
We would like to thank Nadine Laguette for helpful discussions. This work was funded by NIH grant R01 AI087390 to F.D.-G.
PY - 2013/4/17
Y1 - 2013/4/17
N2 - 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.
AB - 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.
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U2 - 10.1016/j.chom.2013.03.005
DO - 10.1016/j.chom.2013.03.005
M3 - Article
C2 - 23601106
AN - SCOPUS:84876369203
SN - 1931-3128
VL - 13
SP - 441
EP - 451
JO - Cell Host and Microbe
JF - Cell Host and Microbe
IS - 4
ER -