1Q2W

X-Ray Crystal Structure of the SARS Coronavirus Main Protease

• PDB DOI: https://doi.org/10.2210/pdb1Q2W/pdb

• Classification: HYDROLASE
• Organism(s): Severe acute respiratory syndrome-related coronavirus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-07-26 Released: 2003-07-29 
• Deposition Author(s): Bonanno, J.B., Fowler, R., Gupta, S., Hendle, J., Lorimer, D., Romero, R., Sauder, J.M., Wei, C.L., Liu, E.T., Burley, S.K., Harris, T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.86 Å
• R-Value Free: 
  0.249 (Depositor), 0.240 (DCC) 
• R-Value Work: 
  0.194 (Depositor), 0.190 (DCC) 
• R-Value Observed: 
  0.207 (Depositor) 

Starting Model: experimental

Literature

Company Says It Mapped Part of SARS Virus

Bonanno, J.B., Fowler, R., Gupta, S., Hendle, J., Lorimer, D., Romero, R., Sauder, J.M., Wei, C.L., Liu, E.T., Burley, S.K., Harris, T.

(2003) N Y Times Web 30 July: C2-C2

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)

Macromolecule Content

• Total Structure Weight: 68.09 kDa 
• Atom Count: 5,104 
• Modelled Residue Count: 592 
• Deposited Residue Count: 616 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3C-like protease	A, B	308	Severe acute respiratory syndrome-related coronavirus	Mutation(s): 0  Gene Names: 1a EC: 3.4.22
UniProt
Find proteins for P0C6U8 (Severe acute respiratory syndrome coronavirus) Explore P0C6U8  Go to UniProtKB:  P0C6U8

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MPD	C [auth A]	(4S)-2-METHYL-2,4-PENTANEDIOL C6 H14 O2 SVTBMSDMJJWYQN-YFKPBYRVSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.86 Å
• R-Value Free:  0.249 (Depositor), 0.240 (DCC) 
• R-Value Work:  0.194 (Depositor), 0.190 (DCC) 
• R-Value Observed: 0.207 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.244	α = 90
b = 98.287	β = 102.86
c = 67.822	γ = 90

Software Package:

Software Name	Purpose
MAR345	data collection
SCALA	data scaling
EPMR	phasing
REFMAC	refinement
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-07-29 
Deposition Author(s): Bonanno, J.B., Fowler, R., Gupta, S., Hendle, J., Lorimer, D., Romero, R., Sauder, J.M., Wei, C.L., Liu, E.T., Burley, S.K., Harris, T.

Revision History  

• Version 1.0: 2003-07-29
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-11
  Changes: Refinement description
• Version 1.4: 2018-11-14
  Changes: Data collection, Database references, Structure summary
• Version 1.5: 2020-02-12
  Changes: Database references, Source and taxonomy, Structure summary
• Version 1.6: 2020-02-26
  Changes: Database references
• Version 1.7: 2021-02-03
  Changes: Database references, Derived calculations, Structure summary
• Version 1.8: 2023-08-16
  Changes: Data collection, Database references, Refinement description