Understanding the association of cell-surface proteins (ACE2 and GRP78) facilitating pathogen recognition: a...

Area of Science:

• Molecular Biology
• Virology
• Structural Biology

Background:

• Angiotensin-converting enzyme 2 (ACE2) is the primary receptor for SARS-CoV and SARS-CoV-2 spike proteins.
• Viral hijacking of ACE2 facilitates cell entry.
• Glucose-regulated protein 78 (GRP78) mediates ACE2 trafficking to the cell membrane.

Purpose of the Study:

• To predict potential binding sites between ACE2 and GRP78.
• To understand the role of ACE2-GRP78 interaction in viral recognition and infection.
• To identify potential therapeutic targets for inhibiting viral entry.

Main Methods:

• Sequence alignment
• Protein-protein docking
• Molecular dynamics simulation (MDS)
• MM-GBSA calculations

Main Results:

• Three critical binding regions identified in ACE2 (C133-C141, C344-C361, C530-C542) for GRP78.
• The region C344-C361 in ACE2 is predicted as the optimal binding site.
• Identified ACE2 regions share similarity with Pep42, a known GRP78 targeting peptide.

Conclusions:

• The study elucidates the structural basis of ACE2-GRP78 interaction.
• The findings suggest a novel strategy for developing inhibitors by preventing ACE2 and GRP78 association.
• This research opens avenues for new antiviral therapies against SARS-CoV-2.