SARS-CoV-2 Spike Protein Interaction Space | JoVE Visualize

Area of Science:

Molecular biology
Virology
Computational chemistry

Background:

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a single-strand RNA virus with surface proteins (spike, envelope, membrane, nucleocapsid) that mediate interactions with host cells.
Angiotensin-converting enzyme 2 (ACE2) serves as the primary cell receptor for SARS-CoV-2, with the virus exhibiting higher affinity for human ACE2 than the original SARS strain.
The topological and symmetrical properties of viral surface proteins are critical for understanding molecular interactions and identifying potential drug targets.

Purpose of the Study:

To computationally model and analyze the topological space and symmetry of SARS-CoV-2 spike proteins in complex with ACE2.
To compare the structural and topological characteristics of SARS-CoV-2 spike proteins with those of the original SARS virus.
To elucidate the role of viral surface protein symmetry in receptor binding and identify potential therapeutic targets.

Main Methods:

Generation of computational models for SARS and SARS-CoV-2 spike proteins complexed with ACE2 using silica methods.
High-throughput computational screening to probe topological spaces and characterize ligand spaces.
Utilizing computational and statistical analysis techniques, including crystallographic protein data bank (PDB) models, to identify symmetry clusters and analyze dihedral angles.
Multimodal representation of spike protein interactions with fragment proteins.

Main Results:

The study identified mirror symmetry between SARS and SARS-CoV-2 spike proteins.
Computational analysis revealed that the topological space of SARS-CoV-2 is variable and possesses a distinct topology compared to SARS.
The chemical space of the receptors, characterized by dimensional volume, highlights the significance of these proteins as drug targets.
Dihedral angle cluster analysis indicated mirror symmetry, correlating with high receptor space specificity.

Conclusions:

Viral surface proteins confer variability and symmetry to the virion, crucial for interactions with complementary targets such as proteins, antibodies, or ligands.
The identified mirror symmetry in dihedral angle clusters of SARS-CoV-2 spike proteins is a key determinant of receptor binding specificity.
These findings underscore the importance of topological and symmetry analysis in understanding viral mechanisms and designing targeted antiviral strategies.