Crystal structure of two-domain RSV INTEGRASE covalently linked with DNA

Experimental Data Snapshot

  • Resolution: 1.86 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.175 

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A possible role for the asymmetric C-terminal domain dimer of Rous sarcoma virus integrase in viral DNA binding.

Shi, K.Pandey, K.K.Bera, S.Vora, A.C.Grandgenett, D.P.Aihara, H.

(2013) PLoS One 8: e56892-e56892

  • DOI: https://doi.org/10.1371/journal.pone.0056892
  • Primary Citation of Related Structures:  
    4FW1, 4FW2

  • PubMed Abstract: 

    Integration of the retrovirus linear DNA genome into the host chromosome is an essential step in the viral replication cycle, and is catalyzed by the viral integrase (IN). Evidence suggests that IN functions as a dimer that cleaves a dinucleotide from the 3' DNA blunt ends while a dimer of dimers (tetramer) promotes concerted integration of the two processed ends into opposite strands of a target DNA. However, it remains unclear why a dimer rather than a monomer of IN is required for the insertion of each recessed DNA end. To help address this question, we have analyzed crystal structures of the Rous sarcoma virus (RSV) IN mutants complete with all three structural domains as well as its two-domain fragment in a new crystal form at an improved resolution. Combined with earlier structural studies, our results suggest that the RSV IN dimer consists of highly flexible N-terminal domains and a rigid entity formed by the catalytic and C-terminal domains stabilized by the well-conserved catalytic domain dimerization interaction. Biochemical and mutational analyses confirm earlier observations that the catalytic and the C-terminal domains of an RSV IN dimer efficiently integrates one viral DNA end into target DNA. We also show that the asymmetric dimeric interaction between the two C-terminal domains is important for viral DNA binding and subsequent catalysis, including concerted integration. We propose that the asymmetric C-terminal domain dimer serves as a viral DNA binding surface for RSV IN.

  • Organizational Affiliation

    Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota, United States of America.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
222Rous sarcoma virus - Prague CMutation(s): 5 
Gene Names: gag-pro-pol
Find proteins for P03354 (Rous sarcoma virus subgroup C (strain Prague))
Explore P03354 
Go to UniProtKB:  P03354
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03354
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.86 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.8α = 90
b = 67.48β = 90
c = 126.56γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-15
    Type: Initial release