PT  - JOURNAL ARTICLE
AU  - Dongchun Ni
AU  - Kelvin Lau
AU  - Frank Lehmann
AU  - Andri Fränkl
AU  - David Hacker
AU  - Florence Pojer
AU  - Henning Stahlberg
TI  - Structural investigation of ACE2 dependent disassembly of the trimeric SARS-CoV-2 Spike glycoprotein
AID  - 10.1101/2020.10.12.336016
DP  - 2020 Jan 01
TA  - bioRxiv
PG  - 2020.10.12.336016
4099  - http://biorxiv.org/content/early/2020/10/12/2020.10.12.336016.short
4100  - http://biorxiv.org/content/early/2020/10/12/2020.10.12.336016.full
AB  - The human membrane protein Angiotensin-converting enzyme 2 (hACE2) acts as the main receptor for host cells invasion of the new coronavirus SARS-CoV-2. The viral surface glycoprotein Spike binds to hACE2, which triggers virus entry into cells. As of today, the role of hACE2 for virus fusion is not well understood. Blocking the transition of Spike from its prefusion to post-fusion state might be a strategy to prevent or treat COVID-19. Here we report a single particle cryo-electron microscopy analysis of SARS-CoV-2 trimeric Spike in presence of the human ACE2 ectodomain. The binding of purified hACE2 ectodomain to Spike induces the disassembly of the trimeric form of Spike and a structural rearrangement of its S1 domain to form a stable, monomeric complex with hACE2. This observed hACE2 dependent dissociation of the Spike trimer suggests a mechanism for the therapeutic role of recombinant soluble hACE2 for treatment of COVID-19.Competing Interest StatementThe authors have declared no competing interest.