Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 18.93 kDa 
• Atom Count: 1369 
• Modelled Residue Count: 149 
• Deposited Residue Count: 171 
• Unique protein chains: 1

3W95

Crystal structure of 2A proteinase (C110A) from enterovirus 71

• DOI: 10.2210/pdb3W95/pdb

• Classification: HYDROLASE
• Organism(s): Human enterovirus 71 (strain 7423/MS/87)
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-03-27 Released: 2013-09-04 
• Deposition Author(s): Mu, Z., Gao, X., Cui, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.249 
• R-Value Work: 0.217 
• R-Value Observed: 0.219 

Literature

Crystal Structure of 2A Proteinase from Hand, Foot and Mouth Disease Virus

Mu, Z., Wang, B., Zhang, X., Gao, X., Qin, B., Zhao, Z., Cui, S.

(2013) J Mol Biol 425: 4530-4543

• PubMed: 23973886 
• DOI: 10.1016/j.jmb.2013.08.016
• Primary Citation of Related Structures:  
  3W95


• PubMed Abstract: 
  

EV71 is responsible for several epidemics worldwide; however, the effective antiviral drug is unavailable to date. The 2A proteinase (2A(pro)) of EV71 presents a promising drug target due to its multiple roles in virus replication, inhibition of host protein synthesis and evasion of innate immunity. We determined the crystal structure of EV71 2A(pro) at 1.85Å resolution, revealing that the proteinase maintains a chymotrypsin-like fold. The active site is composed of the catalytic triads C110A, H21 and D39 with the geometry similar to that in other picornaviral 2A(pro), 3C(pro) and serine proteinases. The cI-to-eI2 loop at the N-terminal domain of EV71 2A(pro) adopts a highly stable conformation and contributes to the hydrophilic surface property, which are strikingly different in HRV2 2A(pro) but are similar in CVB4 2A(pro). We identified a hydrophobic motif "LLWL" followed by an acidic motif "DEE" at the C-terminus of EV71 2A(pro). The "LLWL" motif is folded into the β-turn structure that is essential for the positioning of the acidic motif. Our structural and mutagenesis study demonstrated that both the negative charging and the correct positioning of the C-terminus are essential for EV71 replication. Deletion of the "LLWL" motif abrogated the proteolytic activity, indicating that the motif is critical for maintaining the active proteinase conformation. Our findings provide the structural and functional insights into EV71 2A(pro) and establish a framework for structure-based inhibitor design.

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Organizational Affiliation: 

MOH Key Laboratory of Systems Biology of Pathogens, Institute of Pathogen Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, 9 Dong Dan San Tiao, Beijing 100730, People's Republic of China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Genome polyprotein	A	171	Human enterovirus 71 (strain 7423/MS/87)	Mutation(s): 0  EC: 3.4.22.29 (PDB Primary Data), 3.6.1.15 (PDB Primary Data), 3.4.22.28 (PDB Primary Data), 2.7.7.48 (PDB Primary Data)
Find proteins for Q66479 (Human enterovirus 71 (strain 7423/MS/87)) Explore Q66479  Go to UniProtKB:  Q66479

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.249 
• R-Value Work: 0.217 
• R-Value Observed: 0.219 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 92.5238	α = 90
b = 92.5238	β = 90
c = 36.1267	γ = 90

Software Package:

Software Name	Purpose
CrystalClear	data collection
PHASER	phasing
PHENIX	refinement
CrystalClear	data reduction
CrystalClear	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-03-27 
• Released Date: 2013-09-04 
Deposition Author(s): Mu, Z., Gao, X., Cui, S.

Revision History  

• Version 1.0: 2013-09-04
  Type: Initial release
  
• Version 1.1: 2013-11-20
  Changes: Database references