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Modifications that stabilize human immunodeficiency virus envelope glycoprotein trimers in solution
1Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Harvard Medical School, Harvard School of Public Health, Boston, Massachusetts 02115, USA.
Journal of Virology
|April 25, 2000
Summary
Researchers stabilized human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein trimers using three modifications. These stable, soluble trimers retain structural integrity, aiding further HIV-1 research.
Area of Science:
- Virology
- Structural Biology
- Biochemistry
Background:
- The human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein functional unit is a trimer of gp120 and gp41 subunits.
- Instability of intersubunit interactions has limited the study of soluble HIV-1 envelope glycoprotein trimers.
Purpose of the Study:
- To develop stabilized, soluble forms of HIV-1 envelope glycoprotein trimers.
- To facilitate the characterization and structural understanding of HIV-1 envelope spikes.
Main Methods:
- Modification of HIV-1 envelope glycoproteins by disrupting the gp120/gp41 cleavage site.
- Introduction of intersubunit disulfide bonds using cysteine residues.
- Incorporation of GCN4 trimeric coiled-coil domains for stabilization.
Main Results:
- Successfully produced stable, soluble HIV-1 envelope glycoprotein trimers.
- Characterization confirmed the structural integrity of the stabilized trimers.
- Demonstrated interaction with a gp41 peptide (DP178), supporting a coiled-coil model for gp41.
Conclusions:
- The three modifications effectively stabilize soluble HIV-1 envelope glycoprotein trimers.
- Stable trimers retain native-like structure and are suitable for further investigation.
- This advancement is expected to accelerate understanding of HIV-1 virion structure and function.