4XQ7

The crystal structure of the OAS-like domain (OLD) of human OASL


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural and functional analysis reveals that human OASL binds dsRNA to enhance RIG-I signaling.

Ibsen, M.S.Gad, H.H.Andersen, L.L.Hornung, V.Julkunen, I.Sarkar, S.N.Hartmann, R.

(2015) Nucleic Acids Res. 43: 5236-5248

  • DOI: 10.1093/nar/gkv389

  • PubMed Abstract: 
  • The oligoadenylate synthetase (OAS) enzymes are cytoplasmic dsRNA sensors belonging to the antiviral innate immune system. Upon binding to viral dsRNA, the OAS enzymes synthesize 2'-5' linked oligoadenylates (2-5As) that initiate an RNA decay pathway ...

    The oligoadenylate synthetase (OAS) enzymes are cytoplasmic dsRNA sensors belonging to the antiviral innate immune system. Upon binding to viral dsRNA, the OAS enzymes synthesize 2'-5' linked oligoadenylates (2-5As) that initiate an RNA decay pathway to impair viral replication. The human OAS-like (OASL) protein, however, does not harbor the catalytic activity required for synthesizing 2-5As and differs from the other human OAS family members by having two C-terminal ubiquitin-like domains. In spite of its lack of enzymatic activity, human OASL possesses antiviral activity. It was recently demonstrated that the ubiquitin-like domains of OASL could substitute for K63-linked poly-ubiquitin and interact with the CARDs of RIG-I and thereby enhance RIG-I signaling. However, the role of the OAS-like domain of OASL remains unclear. Here we present the crystal structure of the OAS-like domain, which shows a striking similarity with activated OAS1. Furthermore, the structure of the OAS-like domain shows that OASL has a dsRNA binding groove. We demonstrate that the OAS-like domain can bind dsRNA and that mutating key residues in the dsRNA binding site is detrimental to the RIG-I signaling enhancement. Hence, binding to dsRNA is an important feature of OASL that is required for enhancing RIG-I signaling.


    Organizational Affiliation

    Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
2'-5'-oligoadenylate synthase-like protein
A
359Homo sapiensMutation(s): 0 
Gene Names: OASL (TRIP14)
Find proteins for Q15646 (Homo sapiens)
Go to Gene View: OASL
Go to UniProtKB:  Q15646
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CME
Query on CME
A
L-PEPTIDE LINKINGC5 H11 N O3 S2CYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.167 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 54.800α = 90.00
b = 57.620β = 99.44
c = 64.790γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
Cootmodel building
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-04-22
    Type: Initial release
  • Version 1.1: 2015-05-13
    Type: Database references
  • Version 1.2: 2015-06-10
    Type: Database references
  • Version 1.3: 2018-01-17
    Type: Data collection