8IGX

SARS-CoV-2 3CL protease (3CLpro) in complex with compound 9 (simnotrelvir, SIM0417, SSD8432)

• PDB DOI: https://doi.org/10.2210/pdb8IGX/pdb

• Classification: VIRAL PROTEIN/INHIBITOR
• Organism(s): Severe acute respiratory syndrome coronavirus 2
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2023-02-21 Released: 2023-10-18 
• Deposition Author(s): Su, H.X., Zhao, W.F., Xie, H., Nie, T.Q., Li, M.J., Xu, Y.C.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.212 
• R-Value Work: 0.176 
• R-Value Observed: 0.178 

Literature

Discovery of oral simnotrelvir, an approved SARS-CoV-2 3C-like protease inhibitor for the treatment of COVID-19

Jiang, X., Su, H.

To be published.

Biological Assembly 1  

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

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

Biological Assembly Evidence: mass spectrometry

Macromolecule Content

• Total Structure Weight: 34.38 kDa 
• Atom Count: 2,538 
• Modelled Residue Count: 305 
• Deposited Residue Count: 306 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3C-like proteinase nsp5	A	306	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 0  EC: 3.4.22.69
UniProt
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTD1  Go to UniProtKB:  P0DTD1

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PQL (Subject of Investigation/LOI)	B [auth A]	(8~{S})-~{N}-[(1~{S})-1-cyano-2-[(3~{S})-2-oxidanylidenepyrrolidin-3-yl]ethyl]-7-[(2~{S})-3,3-dimethyl-2-[2,2,2-tris(fluoranyl)ethanoylamino]butanoyl]-1,4-dithia-7-azaspiro[4.4]nonane-8-carboxamide C22 H30 F3 N5 O4 S2 LQBRGTAIBBFUJJ-ZQDZILKHSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.212 
• R-Value Work: 0.176 
• R-Value Observed: 0.178 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.578	α = 90
b = 62.831	β = 90
c = 105.323	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data scaling
PHASER	phasing
HKL-2000	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2023-10-18 
Deposition Author(s): Su, H.X., Zhao, W.F., Xie, H., Nie, T.Q., Li, M.J., Xu, Y.C.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2023-10-18
  Type: Initial release