SARS-CoV-2 Membrane Protein: From Genomic Data to Structural New Insights

Area of Science:

• Virology
• Structural Biology
• Drug Discovery

Background:

• Severe Acute Respiratory Syndrome CoronaVirus-2 (SARS-CoV-2) possesses structural and non-structural proteins crucial for its lifecycle and host immune evasion.
• The SARS-CoV-2 Membrane (M) protein, the most abundant structural protein, plays a key role in viral replication and interferon antagonism.
• The conserved nature of the M protein makes it a promising target for therapeutic interventions against SARS-CoV-2.

Purpose of the Study:

• To elucidate the structural characteristics of the SARS-CoV-2 M protein homodimer.
• To analyze the impact of Single Nucleotide Polymorphisms (SNPs) on M protein dimer stability and its relevance in viral variants.

Main Methods:

• Development and application of a computational workflow to predict M protein dimeric structure, membrane orientation, and interface.
• Analysis of over 1.2 million SARS-CoV-2 genomes to identify M protein SNPs, particularly those at the dimer interface.
• Evaluation of binding free energy differences for interfacial SNPs to assess mutant protein stability.

Main Results:

• Successfully predicted the dimeric structure, membrane orientation, and interface of the SARS-CoV-2 M protein.
• Identified 91 SNPs at the M protein dimer interface, including those found in Variants of Concern (VOC) and Variants of Interest (VOI).
• Determined that certain high-prevalence mutated residues within VOCs and VOIs significantly impact M protein dimer stability.

Conclusions:

• The study provides critical insights into the structural basis of SARS-CoV-2 M protein dimerization.
• Understanding the role of interfacial SNPs in M protein stability offers a new avenue for developing targeted therapeutics.
• This work may facilitate structure-driven drug design for novel SARS-CoV-2 treatments.