3SZN | pdb_00003szn

Crystal structure of SARS coronavirus main protease complexed with an alpha, beta-unsaturated ethyl ester SG75

• PDB DOI: https://doi.org/10.2210/pdb3SZN/pdb

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


• Deposited: 2011-07-19 Released: 2012-07-25 
• Deposition Author(s): Zhu, L., Hilgenfeld, R.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.69 Å
• R-Value Free: 
  0.207 (Depositor), 0.216 (DCC) 
• R-Value Work: 
  0.185 (Depositor), 0.195 (DCC) 
• R-Value Observed: 
  0.186 (Depositor) 

Literature

Crystal structures of SARS-Cov main protease complexed with a series of unsaturated esters

Zhu, L., Hilgenfeld, R.

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)

Macromolecule Content 

• Total Structure Weight: 34.39 kDa 
• Atom Count: 2,854 
• Modeled Residue Count: 306 
• Deposited Residue Count: 306 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3C-like proteinase	A	306	Severe acute respiratory syndrome-related coronavirus	Mutation(s): 0  EC: 3.4.22
UniProt
Find proteins for P0C6X7 (Severe acute respiratory syndrome coronavirus) Explore P0C6X7  Go to UniProtKB:  P0C6X7

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
G75	B [auth A]	ETHYL (4R)-4-({N-[(BENZYLOXY)CARBONYL]-L-PHENYLALANYL}AMINO)-5-[(3S)-2-OXOPYRROLIDIN-3-YL]PENTANOATE C28 H35 N3 O6 PIZHLOUXQJUQHF-VXNXHJTFSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.69 Å
• R-Value Free:  0.207 (Depositor), 0.216 (DCC) 
• R-Value Work:  0.185 (Depositor), 0.195 (DCC) 
• R-Value Observed: 0.186 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 107.98	α = 90
b = 82.3	β = 104.38
c = 53.23	γ = 90

Software Package:

Software Name	Purpose
MAR345	data collection
MOLREP	phasing
REFMAC	refinement
iMOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-07-25 
Deposition Author(s): Zhu, L., Hilgenfeld, R.

Revision History  

• Version 1.0: 2012-07-25
  Type: Initial release
  
• Version 1.1: 2017-11-08
  Changes: Refinement description
• Version 1.2: 2024-11-06
  Changes: Data collection, Database references, Derived calculations, Structure summary