6D3L

Crystal structure of unphosphorylated human PKR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.347 
  • R-Value Work: 0.259 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural Basis of Protein Kinase R Autophosphorylation.

Mayo, C.B.Erlandsen, H.Mouser, D.J.Feinstein, A.G.Robinson, V.L.May, E.R.Cole, J.L.

(2019) Biochemistry --: --

  • DOI: 10.1021/acs.biochem.9b00161
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The RNA-activated protein kinase, PKR, is a key mediator of the innate immunity response to viral infection. Viral double-stranded RNAs induce PKR dimerization and autophosphorylation. The PKR kinase domain forms a back-to-back dimer. However, interm ...

    The RNA-activated protein kinase, PKR, is a key mediator of the innate immunity response to viral infection. Viral double-stranded RNAs induce PKR dimerization and autophosphorylation. The PKR kinase domain forms a back-to-back dimer. However, intermolecular ( trans) autophosphorylation is not feasible in this arrangement. We have obtained PKR kinase structures that resolves this dilemma. The kinase protomers interact via the known back-to-back interface as well as a front-to-front interface that is formed by exchange of activation segments. Mutational analysis of the front-to-front interface support a functional role in PKR activation. Molecular dynamics simulations reveal that the activation segment is highly dynamic in the front-to-front dimer and can adopt conformations conducive to phosphoryl transfer. We propose a mechanism where back-to-back dimerization induces a conformational change that activates PKR to phosphorylate a "substrate" kinase docked in a front-to-front geometry. This mechanism may be relevant to related kinases that phosphorylate the eukaryotic initiation factor eIF2α.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Interferon-induced, double-stranded RNA-activated protein kinase
A
323Homo sapiensMutation(s): 0 
Gene Names: EIF2AK2 (PKR, PRKR)
EC: 2.7.11.1
Find proteins for P19525 (Homo sapiens)
Go to Gene View: EIF2AK2
Go to UniProtKB:  P19525
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.347 
  • R-Value Work: 0.259 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 92.689α = 90.00
b = 92.689β = 90.00
c = 123.325γ = 120.00
Software Package:
Software NamePurpose
Aimlessdata scaling
MOSFLMdata reduction
PDB_EXTRACTdata extraction
PHASERphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesRO1-AI053615

Revision History 

  • Version 1.0: 2019-07-10
    Type: Initial release