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Structural basis for viral late-domain binding to Alix
Sangho Lee1, Anjali Joshi, Kunio Nagashima
1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), US Department of Health and Human Services, Bethesda, Maryland 20892, USA.
Nature Structural & Molecular Biology
|February 6, 2007
Summary
Alix protein
Area of Science:
- Cell biology
- Virology
- Structural biology
Background:
- Alix protein is crucial for endosomal-lysosomal trafficking and HIV-1 budding.
- HIV-1 Gag p6 protein interacts with Alix via a specific motif.
Purpose of the Study:
- To elucidate the structural basis of the Alix-p6 interaction.
- To investigate the role of the Alix V domain in HIV-1 release.
Main Methods:
- X-ray crystallography to determine the structure of the Alix V domain.
- Biochemical assays to study the binding of Alix V domain to HIV-1 p6 peptides.
- Cell-based assays to assess the effect of V domain overexpression on HIV-1 release.
Main Results:
- The Alix V domain (residues 360-702) has a V-shaped structure with 11 alpha-helices.
- A conserved phenylalanine residue (Phe676) is critical for binding to the HIV-1 p6 peptide.
- Overexpression of the Alix V domain inhibits HIV-1 release, an effect reversed by mutations disrupting p6 binding.
Conclusions:
- The Alix V domain's structure is key to its interaction with HIV-1 p6.
- Alix plays a vital role in regulating HIV-1 budding and release.
- Targeting the Alix-p6 interaction could be a strategy for inhibiting HIV-1 replication.
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