Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 24.45 kDa 
• Atom Count: 1810 
• Residue Count: 202 
• Unique protein chains: 1

7JTL

Structure of SARS-CoV-2 ORF8 accessory protein

• DOI: 10.2210/pdb7JTL/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Severe acute respiratory syndrome coronavirus 2
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2020-08-18 Released: 2020-08-26 
• Deposition Author(s): Flower, T.G., Buffalo, C.Z., Hooy, R.M., Allaire, M., Ren, X., Hurley, J.H.
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.04 Å
• R-Value Free: 0.264 
• R-Value Work: 0.220 
• R-Value Observed: 0.224 

Literature

Structure of SARS-CoV-2 ORF8, a rapidly evolving coronavirus protein implicated in immune evasion.

Flower, T.G., Buffalo, C.Z., Hooy, R.M., Allaire, M., Ren, X., Hurley, J.H.

(2020) Biorxiv 

• PubMed: 32869027 
• DOI: 10.1101/2020.08.27.270637
• Primary Citation of Related Structures:  
  7JTL


• PubMed Abstract: 
  

The molecular basis for the severity and rapid spread of the COVID-19 disease caused by SARS-CoV-2 is largely unknown. ORF8 is a rapidly evolving accessory protein that has been proposed to interfere with immune responses. The crystal structure of SARS-CoV-2 ORF8 was determined at 2.04 Å resolution by x-ray crystallography. The structure reveals a ~60 residue core similar to SARS-CoV ORF7a with the addition of two dimerization interfaces unique to SARS-CoV-2 ORF8. A covalent disulfide-linked dimer is formed through an N-terminal sequence specific to SARS-CoV-2, while a separate non-covalent interface is formed by another SARS-CoV-2-specific sequence, ₇₃ YIDI ₇₆ . Together the presence of these interfaces shows how SARS-CoV-2 ORF8 can form unique large-scale assemblies not possible for SARS-CoV, potentially mediating unique immune suppression and evasion activities.

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Organizational Affiliation: 

Biochemistry Research Group, Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Nonstructural protein NS8	A, B	107	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 0  Gene Names: 8
Find proteins for P0DTC8 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTC8  Go to UniProtKB:  P0DTC8

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.04 Å
• R-Value Free: 0.264 
• R-Value Work: 0.220 
• R-Value Observed: 0.224 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 44.258	α = 90
b = 44.258	β = 90
c = 264.111	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
PHASER	phasing
XDS	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2020-08-18 
• Released Date: 2020-08-26 
Deposition Author(s): Flower, T.G., Buffalo, C.Z., Hooy, R.M., Allaire, M., Ren, X., Hurley, J.H.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R37 AI112442
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	F32 GM125209

Revision History 

• Version 1.0: 2020-08-26
  Type: Initial release
  
• Version 1.1: 2020-09-09
  Changes: Database references, Source and taxonomy, Structure summary
• Version 1.2: 2020-09-16
  Changes: Database references