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Protein-protein Interfaces

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...

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Related Experiment Video

Updated: Jul 20, 2025

Analysis of Group IV Viral SSHHPS Using In Vitro and In Silico Methods

Analysis of Group IV Viral SSHHPS Using In Vitro and In Silico Methods

Published on: December 21, 2019

In Silico Substrate-Binding Profiling for SARS-CoV-2 Main Protease (M^pro) Using Hexapeptide Substrates.

Sophakama Zabo¹, Kevin Alan Lobb¹

¹Department of Chemistry, Rhodes University, Makhanda 6139, South Africa.

|July 29, 2023

Summary

Researchers explored how SARS-CoV-2 main protease (Mpro) interacts with peptide substrates. Molecular dynamics and PCA revealed distinct protein motions, aiding the design of novel COVID-19 inhibitors.

Keywords:

PCA SARS-CoV-2 main protease molecular docking molecular dynamics multi-conformer substrate library protein substrate

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A Fluorogenic Peptide Cleavage Assay to Screen for Proteolytic Activity: Applications for coronavirus spike protein activation

A Fluorogenic Peptide Cleavage Assay to Screen for Proteolytic Activity: Applications for coronavirus spike protein activation

Published on: January 9, 2019

Area of Science:

Biochemistry
Structural Biology
Computational Chemistry

Background:

The SARS-CoV-2 main protease (Mpro) is a critical enzyme for viral replication.
Mpro facilitates viral maturation by cleaving polyproteins at specific sites, such as Leu-Gln↓(Ser/Ala/Gly).
Understanding Mpro-substrate interactions is key to developing antiviral therapies.

Purpose of the Study:

To investigate the binding and dynamics of hexapeptide substrates with the SARS-CoV-2 Mpro.
To analyze substrate-induced conformational changes in Mpro using molecular dynamics simulations.
To identify patterns in protein motion that can inform the design of Mpro inhibitors.

Main Methods:

Construction of hexapeptide analogs using RDKit libraries.
Molecular docking of peptides to the Mpro crystal structure (PDB ID 6XHM).
Extensive molecular dynamics (MD) simulations (20 ns) of selected Lys-Leu-Gln*** (KLQ***) complexes.
Analysis of MD trajectories using Principal Component Analysis (PCA) and a novel PCA comparison method.

Main Results:

Hexapeptides formed stable complexes with Mpro, confirmed by reproducible docking.
MD simulations and PCA revealed four distinct classifications of protein motions within KLQ*** complexes.
Substrate variations significantly impacted Mpro's active site dynamics.
A method for comparing PCA plots across different simulations was developed.

Conclusions:

The study provides insights into substrate recognition mechanisms of SARS-CoV-2 Mpro.
Observed protein dynamics highlight the influence of substrate sequence on Mpro active site behavior.
Findings support the rational design of small molecule inhibitors targeting Mpro for COVID-19 treatment.