Long COVID Atlas
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Plain-language first, with specialist detail below. For understanding, not medical advice.

Long COVID Atlas › Glossary › ACE2

Gene/Protein

ACE2

https://longcovidatlas.org/glossary/ace2

In plain language

What it is

A protein on the surface of many cells, including vessel-lining cells, that the virus uses as its doorway.

Why it matters

When spike protein occupies and uses up ACE2, the system that keeps vessels relaxed tips toward constriction and inflammation.

Think of it like

A door handle the virus grabs; with the handle jammed, the room loses its thermostat.

Healthy: ACE2 keeps the balance ACE2 converts angiotensin II into the protective, vessel-relaxing form endothelial cell surface ACE2 relaxAng IIbalanced Long COVID: spike occupies ACE2, the balance tips spike protein angiotensin II rises endothelial cell surface the balance tips spike blocks ACE2 → angiotensin II rises → vessels constrict & inflame → endothelial dysfunction
Spike protein docks onto ACE2, the same receptor the virus uses to enter cells. With ACE2 occupied and depleted, the protective arm that relaxes vessels falls and angiotensin II rises, tipping the balance toward constriction and inflammation. That tilt is endothelial dysfunction beginning.

For specialists

Formal definition

Angiotensin-converting enzyme 2, a carboxypeptidase that converts angiotensin II to angiotensin-(1-7) and serves as the SARS-CoV-2 entry receptor.

Mechanism

Loss of ACE2 activity reduces protective angiotensin-(1-7) signaling and raises angiotensin II, promoting vasoconstriction and inflammation.

Related terms

Spike proteinEndothelial dysfunction