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

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.168 

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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: https://doi.org/10.1093/nar/gkv389
  • Primary Citation of Related Structures:  

  • 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 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 rh@mbg.au.dk.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
2'-5'-oligoadenylate synthase-like protein359Homo sapiensMutation(s): 0 
Gene Names: OASLTRIP14
UniProt & NIH Common Fund Data Resources
Find proteins for Q15646 (Homo sapiens)
Explore Q15646 
Go to UniProtKB:  Q15646
PHAROS:  Q15646
GTEx:  ENSG00000135114 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15646
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CME
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.168 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.8α = 90
b = 57.62β = 99.44
c = 64.79γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Cootmodel building
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-04-22
    Type: Initial release
  • Version 1.1: 2015-05-13
    Changes: Database references
  • Version 1.2: 2015-06-10
    Changes: Database references
  • Version 1.3: 2018-01-17
    Changes: Data collection
  • Version 1.4: 2024-01-10
    Changes: Data collection, Database references, Refinement description