4RWN

Crystal structure of the pre-reactive state of porcine OAS1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

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:  

  • 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 ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
2'-5'-oligoadenylate synthase 1
A
357Sus scrofaMutation(s): 0 
Gene Names: OAS1
EC: 2.7.7.84
Find proteins for Q29599 (Sus scrofa)
Go to Gene View: OAS1
Go to UniProtKB:  Q29599
Entity ID: 2
MoleculeChainsLengthOrganism
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
Entity ID: 3
MoleculeChainsLengthOrganism
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
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
APC
Query on APC

Download SDF File 
Download CCD File 
A
DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER
ALPHA,BETA-METHYLENEADENOSINE-5'-TRIPHOSPHATE
C11 H18 N5 O12 P3
CAWZRIXWFRFUQB-IOSLPCCCSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.188 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 72.400α = 90.00
b = 72.400β = 90.00
c = 205.950γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
MxCuBEdata collection
AMoREphasing
PHENIXrefinement
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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