7AD1 image
Entry Detail
PDB ID:
7AD1
EMDB ID:
Keywords:
Title:
Cryo-EM structure of a prefusion stabilized SARS-CoV-2 Spike (D614N, R682S, R685G, A892P, A942P and V987P)(One up trimer)
Biological Source:
PDB Version:
Deposition Date:
2020-09-14
Release Date:
2020-11-04
Method Details:
Experimental Method:
Resolution:
2.92 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Spike glycoprotein,Envelope glycoprotein,Spike glycoprotein,Envelope glycoprotein,SARS-CoV-2 S protein
Chain IDs:A, B, C
Chain Length:1297
Number of Molecules:3
Biological Source:Severe acute respiratory syndrome coronavirus 2, Human immunodeficiency virus 1
Ligand Molecules
Primary Citation
Stabilizing the closed SARS-CoV-2 spike trimer.
Nat Commun 12 244 244 (2021)
PMID: 33431842 DOI: 10.1038/s41467-020-20321-x

Abstact

The trimeric spike (S) protein of SARS-CoV-2 is the primary focus of most vaccine design and development efforts. Due to intrinsic instability typical of class I fusion proteins, S tends to prematurely refold to the post-fusion conformation, compromising immunogenic properties and prefusion trimer yields. To support ongoing vaccine development efforts, we report the structure-based design of soluble S trimers with increased yields and stabilities, based on introduction of single point mutations and disulfide-bridges. We identify regions critical for stability: the heptad repeat region 1, the SD1 domain and position 614 in SD2. We combine a minimal selection of mostly interprotomeric mutations to create a stable S-closed variant with a 6.4-fold higher expression than the parental construct while no longer containing a heterologous trimerization domain. The cryo-EM structure reveals a correctly folded, predominantly closed pre-fusion conformation. Highly stable and well producing S protein and the increased understanding of S protein structure will support vaccine development and serological diagnostics.

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Primary Citation of related structures