4F02

Crystal structure of the PABP-binding site of eIF4G in complex with RRM1-2 of PABP and poly(A)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Interdomain Allostery Promotes Assembly of the Poly(A) mRNA Complex with PABP and eIF4G.

Safaee, N.Kozlov, G.Noronha, A.M.Xie, J.Wilds, C.J.Gehring, K.

(2012) Mol.Cell 48: 375-386

  • DOI: 10.1016/j.molcel.2012.09.001
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Many RNA-binding proteins contain multiple single-strand nucleic acid-binding domains and assemble into large multiprotein messenger ribonucleic acid protein (mRNP) complexes. The mechanisms underlying the self-assembly of these complexes are largely ...

    Many RNA-binding proteins contain multiple single-strand nucleic acid-binding domains and assemble into large multiprotein messenger ribonucleic acid protein (mRNP) complexes. The mechanisms underlying the self-assembly of these complexes are largely unknown. In eukaryotes, the association of the translation factors polyadenylate-binding protein-1 (PABP) and eIF4G is essential for high-level expression of polyadenylated mRNAs. Here, we report the crystal structure of the ternary complex poly(A)(11)·PABP(1-190)·eIF4G(178-203) at 2.0 Å resolution. Our NMR and crystallographic data show that eIF4G interacts with the RRM2 domain of PABP. Analysis of the interaction by small-angle X-ray scattering, isothermal titration calorimetry, and electromobility shift assays reveals that this interaction is allosterically regulated by poly(A) binding to PABP. Furthermore, we have confirmed the importance of poly(A) for the endogenous PABP and eIF4G interaction in immunoprecipitation experiments using HeLa cell extracts. Our findings reveal interdomain allostery as a mechanism for cooperative assembly of RNP complexes.


    Organizational Affiliation

    Department of Biochemistry, McGill University, Montréal, QC H3G 0B1, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Polyadenylate-binding protein 1
A, D
213Homo sapiensMutation(s): 0 
Gene Names: PABPC1 (PAB1, PABP1, PABPC2)
Find proteins for P11940 (Homo sapiens)
Go to Gene View: PABPC1
Go to UniProtKB:  P11940
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Eukaryotic translation initiation factor 4 gamma 1
C, F
27Homo sapiensMutation(s): 0 
Gene Names: EIF4G1 (EIF4F, EIF4G, EIF4GI)
Find proteins for Q04637 (Homo sapiens)
Go to Gene View: EIF4G1
Go to UniProtKB:  Q04637
Entity ID: 2
MoleculeChainsLengthOrganism
RNA (5'-R(*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*A)-3')B,E11N/A
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.204 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 130.191α = 90.00
b = 130.191β = 90.00
c = 86.872γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data scaling
MxDCdata collection
REFMACrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-08-08
    Type: Initial release
  • Version 1.1: 2013-01-02
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Advisory, Refinement description