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Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers

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Coiled-coil surface presentation: an efficient HIV gp41 binding interface mimic.

Nathan A Schnarr¹, Alan J Kennan

¹Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.

Journal of the American Chemical Society

|August 19, 2004

Summary

Researchers developed a novel peptide mimic of the gp41 N-terminal coiled-coil trimer, crucial for viral infectivity. This stable mimic enables specific binding to viral C-terminal peptides, aiding therapeutic development.

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Area of Science:

Biochemistry
Structural Biology
Virology

Background:

The gp41 N-terminal coiled-coil trimer is essential for viral and cellular membrane fusion, a key step in viral infectivity.
Inhibiting the interaction between the gp41 trimer and its C-terminal binding partner is a promising therapeutic strategy.
The native trimer's hydrophobic pocket causes aggregation, hindering its use as a screening target.

Purpose of the Study:

To design and characterize an efficient, purely peptidic mimic of the gp41 N-terminal coiled-coil trimer.
To create a stable and specific model system for studying the gp41 trimer-peptide interaction.
To develop a versatile platform for targeting viral fusion mechanisms.

Main Methods:

Designed a 1:1:1 heterotrimer using steric matching of alanine/cyclohexylalanine core layers.
Incorporated solubilizing Glu/Lys pairs and a specific gp41 interface on the trimer surface.
Utilized biophysical methods to characterize the complex and its binding specificity.

Main Results:

Successfully created a stable, purely peptidic mimic of the gp41 N-terminal coiled-coil trimer.
The designed heterotrimer specifically binds the C-terminal gp41 peptide.
A control complex lacking half the interface showed no binding, confirming specificity.

Conclusions:

The developed peptidic system effectively mimics the native gp41 trimer's function and specificity.
Control over complex stoichiometry is achievable through interior core residue manipulation.
This approach offers a versatile platform for developing antiviral therapies and can be extended to other viral systems.