4RWN

Crystal structure of the pre-reactive state of porcine OAS1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

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Literature

The Activation Mechanism of 2'-5'-Oligoadenylate Synthetase Gives New Insights Into OAS/cGAS Triggers of Innate Immunity.

Lohofener, J.Steinke, N.Kay-Fedorov, P.Baruch, P.Nikulin, A.Tishchenko, S.Manstein, D.J.Fedorov, R.

(2015) Structure 23: 851-862

  • DOI: 10.1016/j.str.2015.03.012
  • Primary Citation of Related Structures:  
    4RWQ, 4RWN, 4RWO, 4RWP

  • PubMed Abstract: 
  • 2'-5'-Oligoadenylate synthetases (OASs) produce the second messenger 2'-5'-oligoadenylate, which activates RNase L to induce an intrinsic antiviral state. We report on the crystal structures of catalytic intermediates of OAS1 including the OAS1·dsRNA complex without substrates, with a donor substrate, and with both donor and acceptor substrates ...

    2'-5'-Oligoadenylate synthetases (OASs) produce the second messenger 2'-5'-oligoadenylate, which activates RNase L to induce an intrinsic antiviral state. We report on the crystal structures of catalytic intermediates of OAS1 including the OAS1·dsRNA complex without substrates, with a donor substrate, and with both donor and acceptor substrates. Combined with kinetic studies of point mutants and the previously published structure of the apo form of OAS1, the new data suggest a sequential mechanism of OAS activation and show the individual roles of each component. They reveal a dsRNA-mediated push-pull effect responsible for large conformational changes in OAS1, the catalytic role of the active site Mg(2+), and the structural basis for the 2'-specificity of product formation. Our data reveal similarities and differences in the activation mechanisms of members of the OAS/cyclic GMP-AMP synthase family of innate immune sensors. In particular, they show how helix 3103-α5 blocks the synthesis of cyclic dinucleotides by OAS1.


    Organizational Affiliation

    Institute for Biophysical Chemistry, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany; Research Division for Structural Analysis, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany. Electronic address: fedorov.roman@mh-hannover.de.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
2'-5'-oligoadenylate synthase 1A357Sus scrofaMutation(s): 0 
Gene Names: OAS1
EC: 2.7.7.84
UniProt
Find proteins for Q29599 (Sus scrofa)
Explore Q29599 
Go to UniProtKB:  Q29599
Protein Feature View
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  • Reference Sequence
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  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    RNA (5'-R(*GP*GP*CP*UP*UP*UP*UP*GP*AP*CP*CP*UP*UP*UP*AP*UP*GP*AP*A)-3')B19synthetic construct
    Protein Feature View
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    • Reference Sequence
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    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      RNA (5'-R(*UP*UP*CP*AP*UP*AP*AP*AP*GP*GP*UP*CP*AP*AP*AP*AP*GP*CP*C)-3')C19synthetic construct
      Protein Feature View
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      • Reference Sequence
      Small Molecules
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.00 Å
      • R-Value Free: 0.234 
      • R-Value Work: 0.188 
      • R-Value Observed: 0.190 
      • Space Group: P 43 21 2
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 72.4α = 90
      b = 72.4β = 90
      c = 205.95γ = 90
      Software Package:
      Software NamePurpose
      MxCuBEdata collection
      AMoREphasing
      PHENIXrefinement
      XDSdata reduction
      XDSdata scaling

      Structure Validation

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      Ligand Structure Quality Assessment  



      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2015-05-20
        Type: Initial release