Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 30.11 kDa 
• Atom Count: 2,225 
• Modelled Residue Count: 182 
• Deposited Residue Count: 188 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

 2ZKO

Structural basis for dsRNA recognition by NS1 protein of human influenza virus A

• PDB DOI: 10.2210/pdb2ZKO/pdb
• NDB: PR0337

• Classification: RNA BINDING PROTEIN/RNA
• Organism(s): Influenza A virus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-03-26 Released: 2008-10-14 
• Deposition Author(s): Yuan, Y.A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.230 
• R-Value Work: 0.189 
• R-Value Observed: 0.191 

Literature

Structural basis for dsRNA recognition by NS1 protein of influenza A virus

Cheng, A., Wong, S.M., Yuan, Y.A.

(2009) Cell Res 19: 187-195

• PubMed: 18813227 
• DOI: 10.1038/cr.2008.288
• Primary Citation of Related Structures:  
  2ZKO


• PubMed Abstract: 
  

Influenza A viruses are important human pathogens causing periodic pandemic threats. Nonstructural protein 1 (NS1) protein of influenza A virus (NS1A) shields the virus against host defense. Here, we report the crystal structure of NS1A RNA-binding domain (RBD) bound to a double-stranded RNA (dsRNA) at 1.7A. NS1A RBD forms a homodimer to recognize the major groove of A-form dsRNA in a length-independent mode by its conserved concave surface formed by dimeric anti-parallel alpha-helices. dsRNA is anchored by a pair of invariable arginines (Arg38) from both monomers by extensive hydrogen bonds. In accordance with the structural observation, isothermal titration calorimetry assay shows that the unique Arg38-Arg38 pair and two Arg35-Arg46 pairs are crucial for dsRNA binding, and that Ser42 and Thr49 are also important for dsRNA binding. Agrobacterium co-infiltration assay further supports that the unique Arg38 pair plays important roles in dsRNA binding in vivo.Cell Research (2009) 19:187-195. doi: 10.1038/cr.2008.288; published online 23 September 2008.

---

Organizational Affiliation: 

Genome and Structural Biology Program, Temasek Life Sciences Laboratory, National University of Singapore, 1 Research Link, Singapore 117604, Singapore.

Macromolecules

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Non-structural protein 1	C [auth A], D [auth B]	73	Influenza A virus	Mutation(s): 0
UniProt
Find proteins for P03496 (Influenza A virus (strain A/Puerto Rico/8/1934 H1N1)) Explore P03496  Go to UniProtKB:  P03496

Entity ID: 1
Molecule	Chains	Length	Organism	Image
RNA (5'-R(P*AP*GP*AP*CP*AP*GP*CP*AP*UP*UP*AP*UP*GP*CP*UP*GP*UP*CP*UP*UP*U)-3')	A [auth C], B [auth D]	21	N/A

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	E [auth A], F [auth B]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.230 
• R-Value Work: 0.189 
• R-Value Observed: 0.191 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.707	α = 90
b = 57.218	β = 105.95
c = 83.709	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
CBASS	data collection
HKL-2000	data reduction
HKL-2000	data scaling
CCP4	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-10-14 
Deposition Author(s): Yuan, Y.A.

Revision History  

• Version 1.0: 2008-10-14
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2014-01-22
  Changes: Database references