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Conformational Evaluation of HIV-1 Trimeric Envelope Glycoproteins Using a Cell-based ELISA Assay
Published on: September 14, 2014
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Trimer Enhancement Mutation Effects on HIV-1 Matrix Protein Binding Activities
Ayna Alfadhli1, Andrew Mack1, Christopher Ritchie1
1Department of Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, Oregon, USA.
Journal of Virology
|April 1, 2016
Summary
The HIV-1 matrix (MA) protein
Area of Science:
- Virology
- Structural Biology
- Molecular Biology
Background:
- The HIV-1 matrix (MA) protein is crucial for virus assembly.
- MA mediates interactions with membranes, RNA, and the HIV-1 envelope (Env) protein.
- MA's role in Env incorporation into virions is not fully understood.
Purpose of the Study:
- To investigate the mechanism by which MA facilitates Env incorporation into HIV-1 virions.
- To examine the binding activities of wild-type (WT) MA and a trimer-stabilizing MA mutant (62QR).
Main Methods:
- Comparative analysis of WT MA and 62QR MA binding to membranes, RNA, and Env cytoplasmic tails (CTs).
- Assessment of MA trimerization stability and membrane organization.
- Correlation of Env CT binding efficiency with MA trimerization.
Main Results:
- The 62QR mutation stabilized MA trimers but did not alter membrane organization.
- 62QR MA showed only slight differences in membrane and RNA binding compared to WT MA.
- 62QR MA exhibited significantly enhanced binding to Env CTs, correlating with trimerization efficiency.
Conclusions:
- MA trimerization is critical for efficient binding to Env CTs.
- Multivalent binding between trimeric Env proteins and trimeric MA proteins likely drives Env incorporation into virions.
- This study provides insights into the molecular mechanisms of HIV-1 assembly.
