8SZX image
Entry Detail
PDB ID:
8SZX
Title:
Crystal structure of b'-WD40 Lys17Ala mutant
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-05-30
Release Date:
2024-02-14
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
I 41
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Coatomer subunit beta'
Mutations:K17A
Chain IDs:A, B
Chain Length:302
Number of Molecules:2
Biological Source:Saccharomyces cerevisiae
Primary Citation
A single C-terminal residue controls SARS-CoV-2 spike trafficking and incorporation into VLPs.
Nat Commun 14 8358 8358 (2023)
PMID: 38102143 DOI: 10.1038/s41467-023-44076-3

Abstact

The spike (S) protein of SARS-CoV-2 is delivered to the virion assembly site in the ER-Golgi Intermediate Compartment (ERGIC) from both the ER and cis-Golgi in infected cells. However, the relevance and modulatory mechanism of this bidirectional trafficking are unclear. Here, using structure-function analyses, we show that S incorporation into virus-like particles (VLP) and VLP fusogenicity are determined by coatomer-dependent S delivery from the cis-Golgi and restricted by S-coatomer dissociation. Although S mimicry of the host coatomer-binding dibasic motif ensures retrograde trafficking to the ERGIC, avoidance of the host-like C-terminal acidic residue is critical for S-coatomer dissociation and therefore incorporation into virions or export for cell-cell fusion. Because this C-terminal residue is the key determinant of SARS-CoV-2 assembly and fusogenicity, our work provides a framework for the export of S protein encoded in genetic vaccines for surface display and immune activation.

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