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CD4: its structure, role in immune function and AIDS pathogenesis, and potential as a pharmacological target
R W Sweet1, A Truneh, W A Hendrickson
1SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania.
Current Opinion in Biotechnology
|August 1, 1991
Summary
The CD4 molecule is essential for T cell development and serves as the entry point for HIV. Recent structural studies reveal CD4's unique immunoglobulin fold, aiding understanding of its interactions with MHC class II and HIV's gp120 protein.
Area of Science:
- Immunology
- Structural Biology
- Virology
Background:
- CD4 is a critical T-cell surface glycoprotein essential for immune responses.
- CD4 also functions as the primary receptor for Human Immunodeficiency Virus (HIV) entry.
- Understanding CD4's molecular interactions is key to T cell function and HIV pathogenesis.
Purpose of the Study:
- To elucidate the structural basis of CD4 interactions.
- To provide an atomic framework for CD4's role in T cell activation and viral binding.
- To detail novel structural features of the CD4 molecule.
Main Methods:
- Determination of the three-dimensional structure of an extracellular CD4 fragment.
- Analysis of structural variations in the immunoglobulin fold.
- Interpretation of molecular interactions based on the determined structure.
Main Results:
- Novel variations of the immunoglobulin fold within the CD4 structure were identified.
- An atomic framework was established for CD4's interactions with MHC class II molecules.
- The structural basis for CD4 binding to the HIV gp120 glycoprotein was elucidated.
Conclusions:
- The determined CD4 structure provides critical insights into its dual role in immunity and viral infection.
- Structural information facilitates the design of therapeutic interventions targeting CD4-mediated processes.
- This work enhances our understanding of molecular recognition involving CD4.