ArticleJournal of virology2025
Deciphering lentiviral Vpr/Vpx determinants required for HUSH and SAMHD1 antagonism highlights the molecular plasticity of these evolutionary conflicts.
Article in Journal of virology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- Human Immunodeficiency Virus Type 2 Vpx-mediated Degradation of TASOR Activates Innate Immune Sensing of Nucleic Acids in Infected Cells.Journal of molecular biology · 2026Article
- Host restriction factors and p17-Driven inflammaging in HIV-1: From molecular pathogenesis to functional cure.AIMS microbiology · 2026Review
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10 authors.
Funding
Abstract
SAMHD1 and the HUSH complex constitute two blocks during primate lentivirus infection, the first by limiting reverse transcription and the second by inhibiting proviral expression. Vpr and Vpx of specific lentiviral lineages have evolved to antagonize these antiviral proteins. While the antagonism of SAMHD1 has been well characterized, the evolutionary and molecular determinants of the antagonism against HUSH are unknown. We used chimeric Vpr proteins between SIVagm.Ver and SIVagm.Gri lentiviruses infecting two African green monkey species to investigate viral determinants involved in HUSH and SAMHD1 antagonisms. We found that different interfaces of closely related Vpr proteins are engaged to degrade different SAMHD1 haplotypes. In addition, we identified distinct viral determinants in SIVagm.Ver Vpr for SAMHD1 and HUSH degradation. The substitution of one residue in SIVagm.Gri Vpr is sufficient to gain the capacity to degrade SAMHD1, while the substitution of α-helix 3 confers HUSH antagonism. We also found that Vpx proteins of HIV-2 from people living with HIV have different abilities to degrade HUSH. These phenotypes rely on small changes in either the N or C terminal part of Vpx, depending on the context. On the host side, we found that HIV-2 and SIVsmm Vpx degrading HUSH from human and vervet monkey cells cannot degrade HUSH in owl monkey cells, suggesting some host species specificity. Altogether, we highlight the molecular plasticity and constraints of viral proteins to adapt to host restrictions. HUSH, like SAMHD1, may have been engaged in ancient and more recent coevolution conflicts with lentiviruses and a player in viral fitness.IMPORTANCEAntiviral host proteins, the so-called restriction factors, block lentiviruses at different steps of their viral replication cycle. In return, primate lentiviruses may counteract these immune proteins to efficiently spread
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