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: assay for oligomerization

Macromolecule Content

• Total Structure Weight: 33.83 kDa 
• Atom Count: 2454 
• Residue Count: 306 
• Unique protein chains: 1

6M03

The crystal structure of COVID-19 main protease in apo form

• DOI: 10.2210/pdb6M03/pdb

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


• Deposited: 2020-02-19 Released: 2020-03-11 
• Deposition Author(s): Zhang, B., Zhao, Y., Jin, Z., Liu, X., Yang, H., Rao, Z.
• Funding Organization(s): Chinese Academy of Sciences, National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.246 
• R-Value Work: 0.196 
• R-Value Observed: 0.201 

Literature

The crystal structure of COVID-19 main protease in apo form

Zhang, B., Zhao, Y., Jin, Z., Liu, X., Yang, H., Rao, Z.

To be published.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
main protease	A	306	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 0  Gene Names: rep, 1a-1b EC: 3.4.22.69 (PDB Primary Data), 3.4.19.12 (UniProt), 3.4.22 (UniProt), 2.7.7.48 (UniProt), 3.6.4.12 (UniProt), 3.6.4.13 (UniProt), 3.1.13 (UniProt), 3.1 (UniProt), 2.1.1 (UniProt)
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2) Go to UniProtKB:  P0DTD1

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.246 
• R-Value Work: 0.196 
• R-Value Observed: 0.201 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 113.964	α = 90
b = 53.45	β = 101.83
c = 45.029	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XSCALE	data scaling
PDB_EXTRACT	data extraction
XDS	data reduction
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2020-02-19 
• Released Date: 2020-03-11 
Deposition Author(s): Zhang, B., Zhao, Y., Jin, Z., Liu, X., Yang, H., Rao, Z.

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Funding Organization	Location	Grant Number
Chinese Academy of Sciences	China	2017YFC0840300
National Natural Science Foundation of China (NSFC)	China	81520108019

Revision History 

• Version 1.0: 2020-03-11
  Type: Initial release
  
• Version 1.1: 2020-05-06
  Changes: Database references, Source and taxonomy, Structure summary
• Version 1.2: 2020-06-10
  Changes: Database references, Structure summary