2FXP image
Deposition Date 2006-02-06
Release Date 2006-03-07
Last Version Date 2024-05-29
Entry Detail
PDB ID:
2FXP
Keywords:
Title:
Solution Structure of the SARS-Coronavirus HR2 Domain
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Conformers Submitted:
1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Spike glycoprotein
Gene (Uniprot):S
Chain IDs:A, B, C
Chain Length:55
Number of Molecules:3
Biological Source:SARS coronavirus
Ligand Molecules
Primary Citation
Solution structure of the severe acute respiratory syndrome-coronavirus heptad repeat 2 domain in the prefusion state
J.Biol.Chem. 281 11965 11971 (2006)
PMID: 16507566 DOI: 10.1074/jbc.M601174200

Abstact

The envelope glycoprotein, termed the spike protein, of severe acute respiratory syndrome coronavirus (SARS-CoV) is known to mediate viral entry. Similar to other class 1 viral fusion proteins, the heptad repeat regions of SARS-CoV spike are thought to undergo conformational changes from a prefusion form to a subsequent post-fusion form that enables fusion of the viral and host membranes. Recently, the structure of a post-fusion form of SARS-CoV spike, which consists of isolated domains of heptad repeats 1 and 2 (HR1 and HR2), has been determined by x-ray crystallography. To date there is no structural information for the prefusion conformations of SARS-CoV HR1 and HR2. In this work we present the NMR structure of the HR2 domain (residues 1141-1193) from SARS-CoV (termed S2-HR2) in the presence of the co-solvent trifluoroethanol. We find that in the absence of HR1, S2-HR2 forms a coiled coil symmetric trimer with a complex molecular mass of 18 kDa. The S2-HR2 structure, which is the first example of the prefusion form of coronavirus envelope, supports the current model of viral membrane fusion and gives insight into the design of structure-based antagonists of SARS.

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