SARS-CoV-2 first contact: Spike-ACE2 interactions in COVID-19

Area of Science:

• Structural biology
• Biochemistry
• Molecular interactions

Background:

• The Angiotensin-Converting Enzyme 2 (ACE2) is a crucial host receptor for SARS-CoV-2 entry.
• Understanding the structural basis of ACE2 interactions is vital for developing antiviral strategies.

Purpose of the Study:

• To elucidate the structural complex of full-length human ACE2 with B0AT1.
• To characterize the pre-fusion state of ACE2 involved in initial viral interactions.

Main Methods:

• Cryo-electron microscopy (Cryo-EM) or X-ray crystallography to determine the structure of the ACE2-B0AT1 complex.
• Biochemical assays to confirm binding interactions and functional relevance.

Main Results:

• The full-length human ACE2 forms a stable complex with B0AT1.
• The complex adopts an open pre-fusion conformation.
• This conformation facilitates pre-invasion interactions with the ACE2 N-terminal domain.

Conclusions:

• The ACE2-B0AT1 complex structure reveals a novel conformation facilitating host-pathogen interactions.
• This structural insight provides a basis for understanding early steps in viral invasion.