Crystal structure of human LGP2 C-terminal domain in complex with dsRNA

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.214 

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The RIG-I-like Receptor LGP2 Recognizes the Termini of Double-stranded RNA

Li, X.Ranjith-Kumar, C.T.Brooks, M.T.Dharmaiah, S.Herr, A.B.Kao, C.Li, P.

(2009) J Biol Chem 284: 13881-13891

  • DOI: https://doi.org/10.1074/jbc.M900818200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The RIG-I-like receptors (RLRs), RIG-I and MDA5, recognize single-stranded RNA with 5' triphosphates and double-stranded RNA (dsRNA) to initiate innate antiviral immune responses. LGP2, a homolog of RIG-I and MDA5 that lacks signaling capability, regulates the signaling of the RLRs. To establish the structural basis of dsRNA recognition by the RLRs, we have determined the 2.0-A resolution crystal structure of human LGP2 C-terminal domain bound to an 8-bp dsRNA. Two LGP2 C-terminal domain molecules bind to the termini of dsRNA with minimal contacts between the protein molecules. Gel filtration chromatography and analytical ultracentrifugation demonstrated that LGP2 binds blunt-ended dsRNA of different lengths, forming complexes with 2:1 stoichiometry. dsRNA with protruding termini bind LGP2 and RIG-I weakly and do not stimulate the activation of RIG-I efficiently in cells. Surprisingly, full-length LGP2 containing mutations that abolish dsRNA binding retained the ability to inhibit RIG-I signaling.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A & M University, College Station, Texas 77843-2128.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-dependent RNA helicase DHX58
A, B
145Homo sapiensMutation(s): 0 
Gene Names: D11LGP2EDHX58LGP2
EC: 3.6.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q96C10 (Homo sapiens)
Explore Q96C10 
Go to UniProtKB:  Q96C10
GTEx:  ENSG00000108771 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96C10
Sequence Annotations
  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains LengthOrganismImage
C, D
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.214 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.458α = 90
b = 54.191β = 97.26
c = 67.203γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2009-03-10 
  • Deposition Author(s): Li, P., Li, X.

Revision History  (Full details and data files)

  • Version 1.0: 2009-03-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description