SAMHD1 is a cellular dNTPase proposed to inhibit HIV-1 reverse transcription in non-cycling immune cells by limiting dNTP substrate supply; its anti-viral but not dNTPase function is downregulated by phosphorylation of T592. Here, Martinat et al. describe an additional SUMOylation at residue K595, which promotes the dNTPase-independent restriction activity.
- Charlotte Martinat
- Arthur Cormier
- Alessia Zamborlini
