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MITD1 restricts HIV-1 release by targeting ESCRT-III proteins
Jim Zoladek1, Marion Cannac2, Claire Lacouture1
1Institut de Recherche en Infectiologie de Montpellier (IRIM), Montpellier University, Centre National de la Recherche Scientifique (CNRS) UMR 9004, INSERM, Montpellier, France.
MITD1, an interferon-stimulated gene, inhibits HIV-1 release by disrupting the ESCRT-III machinery essential for viral budding. This discovery identifies MITD1 as a key factor in innate immunity
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- HIV-1 egress relies on the Gag protein and host ESCRT machinery.
- The role of innate immunity in regulating ESCRT function for viral release is not fully understood.
Purpose of the Study:
- To investigate how innate immunity regulates ESCRT function to limit HIV-1 egress.
- To identify specific host factors involved in restricting viral budding.
Main Methods:
- Investigated MITD1, a cell type-specific interferon-stimulated gene.
- Analyzed MITD1's interaction with ESCRT-III subunits (CHMP1B, CHMP4B).
- Assessed the impact of MITD1 on HIV-1 release in various cell types.
Main Results:
- MITD1 inhibits ESCRT-dependent HIV-1 budding by impairing ESCRT-III assembly.
- MITD1 causes accumulation of immature HIV-1 particles at the plasma membrane.
- Overexpression of MITD1 reduces HIV-1 release in cell lines, PBMCs, and microglia.
Conclusions:
- MITD1 acts as an interferon-stimulated restriction factor against HIV-1.
- MITD1 limits HIV-1 egress by disrupting ESCRT-III assembly.
- MITD1's inhibitory effect is specific to ESCRT-dependent viruses.
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