3SDL

Crystal structure of human ISG15 in complex with NS1 N-terminal region from influenza B virus, Northeast Structural Genomics Consortium Target IDs HX6481, HR2873, and OR2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.29 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for the sequence-specific recognition of human ISG15 by the NS1 protein of influenza B virus.

Guan, R.Ma, L.C.Leonard, P.G.Amer, B.R.Sridharan, H.Zhao, C.Krug, R.M.Montelione, G.T.

(2011) Proc.Natl.Acad.Sci.USA 108: 13468-13473

  • DOI: 10.1073/pnas.1107032108

  • PubMed Abstract: 
  • Interferon-induced ISG15 conjugation plays an important antiviral role against several viruses, including influenza viruses. The NS1 protein of influenza B virus (NS1B) specifically binds only human and nonhuman primate ISG15s and inhibits their conj ...

    Interferon-induced ISG15 conjugation plays an important antiviral role against several viruses, including influenza viruses. The NS1 protein of influenza B virus (NS1B) specifically binds only human and nonhuman primate ISG15s and inhibits their conjugation. To elucidate the structural basis for the sequence-specific recognition of human ISG15, we determined the crystal structure of the complex formed between human ISG15 and the N-terminal region of NS1B (NS1B-NTR). The NS1B-NTR homodimer interacts with two ISG15 molecules in the crystal and also in solution. The two ISG15-binding sites on the NS1B-NTR dimer are composed of residues from both chains, namely residues in the RNA-binding domain (RBD) from one chain, and residues in the linker between the RBD and the effector domain from the other chain. The primary contact region of NS1B-NTR on ISG15 is composed of residues at the junction of the N-terminal ubiquitin-like (Ubl) domain and the short linker region between the two Ubl domains, explaining why the sequence of the short linker in human and nonhuman primate ISG15s is essential for the species-specific binding of these ISG15s. In addition, the crystal structure identifies NS1B-NTR binding sites in the N-terminal Ubl domain of ISG15, and shows that there are essentially no contacts with the C-terminal Ubl domain of ISG15. Consequently, NS1B-NTR binding to ISG15 would not occlude access of the C-terminal Ubl domain of ISG15 to its conjugating enzymes. Nonetheless, transfection assays show that NS1B-NTR binding of ISG15 is responsible for the inhibition of interferon-induced ISG15 conjugation in cells.


    Organizational Affiliation

    Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway NJ 08854, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Non-structural protein 1
A, B
113Influenza B virus (strain B/Lee/1940)Mutation(s): 0 
Gene Names: NS
Find proteins for P03502 (Influenza B virus (strain B/Lee/1940))
Go to UniProtKB:  P03502
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin-like protein ISG15
C, D
164Homo sapiensMutation(s): 0 
Gene Names: ISG15 (G1P2, UCRP)
Find proteins for P05161 (Homo sapiens)
Go to Gene View: ISG15
Go to UniProtKB:  P05161
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.29 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.222 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 39.009α = 70.59
b = 56.142β = 84.24
c = 74.020γ = 83.91
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
PHENIXrefinement
HKL-2000data scaling
MAR345data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-07-20
    Type: Initial release
  • Version 1.1: 2011-08-03
    Type: Database references
  • Version 1.2: 2011-08-31
    Type: Database references
  • Version 1.3: 2017-11-08
    Type: Refinement description