COVID-19 pandemic: Insights into structure, function, and hACE2 receptor recognition by SARS-CoV-2

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) poses a significant global health threat with millions of infections and rising mortality.
• The absence of specific antiviral drugs or vaccines necessitates a deep understanding of viral entry mechanisms.
• Viral entry is a critical determinant of host range and cross-species transmission.

Purpose of the Study:

• To review the origin, evolution, and key viral factors of SARS-CoV-2.
• To elucidate the mechanism of SARS-CoV-2 host cell entry, focusing on spike protein-ACE2 interactions.
• To provide a comparative analysis of SARS-CoV and SARS-CoV-2, including their spike proteins and antigenicity.

Main Methods:

• Literature review of current knowledge on SARS-CoV-2.
• Analysis of viral structure, focusing on the spike (S) glycoprotein and RNA-dependent RNA polymerase (RdRp).
• Comparative analysis of SARS-CoV and SARS-CoV-2 spike proteins, receptor-binding domains (RBDs), and antigenicity.

Main Results:

• SARS-CoV-2 utilizes its spike protein's RBD to bind to human ACE2 receptors, initiating host cell entry and membrane fusion.
• The review summarizes knowledge on SARS-CoV-2 origins, evolution, and critical viral factors.
• Comparative analysis reveals differences in spike protein structure, receptor-binding specificity, and antigenicity between SARS-CoV and SARS-CoV-2.

Conclusions:

• Understanding the molecular mechanisms of SARS-CoV-2 entry is vital for developing effective therapeutics and vaccines.
• The spike protein-ACE2 interaction is a key target for antiviral strategies.
• Comparative analysis aids in understanding viral adaptation and host tropism.