7WQ9 | pdb_00007wq9

Crystal structure of SARS-CoV-2 main protease in complex with Z-IETD-FMK

• PDB DOI: https://doi.org/10.2210/pdb7WQ9/pdb

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


• Deposited: 2022-01-25 Released: 2023-08-02 
• Deposition Author(s): Wang, Y.C., Yang, C.S., Hou, M.H., Tsai, C.L., Chen, Y.
• Funding Organization(s): Ministry of Science and Technology (MoST, Taiwan)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 
  0.246 (Depositor), 0.242 (DCC) 
• R-Value Work: 
  0.210 (Depositor) 

Starting Models: experimental

Literature

Crystal structure of SARS-CoV-2 main protease in complex with Z-IETD-FMK

Wang, Y.C., Yang, C.S., Hou, M.H., Tsai, C.L., Chen, Y.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

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

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 34.54 kDa 
• Atom Count: 2,452 
• Modeled Residue Count: 307 
• Deposited Residue Count: 313 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3C-like proteinase	A	307	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 0  EC: 3.4.19.12 (PDB Primary Data), 3.4.22 (PDB Primary Data), 3.4.22.69 (PDB Primary Data), 2.7.7.48 (PDB Primary Data), 3.6.4.12 (PDB Primary Data), 3.6.4.13 (PDB Primary Data), 3.1.13 (PDB Primary Data), 3.1 (PDB Primary Data), 2.1.1 (PDB Primary Data)
UniProt
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTD1  Go to UniProtKB:  P0DTD1

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Z-IETD-FMK	B	6	synthetic construct	Mutation(s): 0

Small Molecules

Modified Residues  2 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
FL6	B	L-PEPTIDE LINKING	C5 H9 N O4		ASP
GME	B	L-PEPTIDE LINKING	C6 H11 N O4		GLU

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free:  0.246 (Depositor), 0.242 (DCC) 
• R-Value Work:  0.210 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 110.387	α = 90
b = 55.248	β = 101.516
c = 46.901	γ = 90

Software Package:

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

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2023-08-02 
Deposition Author(s): Wang, Y.C., Yang, C.S., Hou, M.H., Tsai, C.L., Chen, Y.

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Funding Organization	Location	Grant Number
Ministry of Science and Technology (MoST, Taiwan)	Taiwan	109-2311-B241-001

Revision History  

• Version 1.0: 2023-08-02
  Type: Initial release
  
• Version 1.1: 2026-03-04
  Changes: Data collection, Derived calculations, Refinement description, Structure summary