4AZA

Improved eIF4E binding peptides by phage display guided design.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Improved Eif4E Binding Peptides by Phage Display Guided Design: Plasticity of Interacting Surfaces Yield Collective Effects.

Zhou, W.Quah, S.T.Verma, C.S.Liu, Y.Lane, D.P.Brown, C.J.

(2012) Plos One 7: 47235

  • DOI: 10.1371/journal.pone.0047235

  • PubMed Abstract: 
  • Eukaryotic initiation factor (eIF)4E is over-expressed in many types of cancer such as breast, head and neck, and lung. A consequence of increased levels of eIF4E is the preferential translation of pro-tumorigenic proteins (e.g. c-Myc and vascular en ...

    Eukaryotic initiation factor (eIF)4E is over-expressed in many types of cancer such as breast, head and neck, and lung. A consequence of increased levels of eIF4E is the preferential translation of pro-tumorigenic proteins (e.g. c-Myc and vascular endothelial growth factor) and as a result is regarded as a potential therapeutic target. In this work a novel phage display peptide has been isolated against eIF4E. From the phage sequence two amino acids were delineated which improved binding when substituted into the eIF4G1 sequence. Neither of these substitutions were involved in direct interactions with eIF4E and acted either via optimization of the helical capping motif or restricting the conformational flexibility of the peptide. In contrast, substitutions of the remaining phage derived amino acids into the eIF4G1 sequence disrupted binding of the peptide to eIF4E. Interestingly when some of these disruptive substitutions were combined with key mutations from the phage peptide, they lead to improved affinities. Atomistic computer simulations revealed that the phage and the eIF4G1 derivative peptide sequences differ subtly in their interaction sites on eIF4E. This raises the issue, especially in the context of planar interaction sites such as those exhibited by eIF4E, that given the intricate plasticity of protein surfaces, the construction of structure-activity relationships should account for the possibility of significant movement in the spatial positioning of the peptide binding interface, including significant librational motions of the peptide.


    Organizational Affiliation

    Bioinformatics Institute, Agency for Science, Technology and Research (ASTAR), Singapore.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC TRANSLATION INITIATION FACTOR 4E
A, C
217Homo sapiensMutation(s): 0 
Gene Names: EIF4E (EIF4EL1, EIF4F)
Find proteins for P06730 (Homo sapiens)
Go to Gene View: EIF4E
Go to UniProtKB:  P06730
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
EIF4G1_D5S PEPTIDE
B, D
14Homo sapiensMutation(s): 0 
Gene Names: EIF4G1 (EIF4F, EIF4G, EIF4GI)
Find proteins for Q04637 (Homo sapiens)
Go to Gene View: EIF4G1
Go to UniProtKB:  Q04637
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MGO
Query on MGO

Download SDF File 
Download CCD File 
A, C
[[(2R,3S,4R,5R)-5-(6-AMINO-3-METHYL-4-OXO-5H-IMIDAZO[4,5-C]PYRIDIN-1-YL)-3,4-DIHYDROXY-OXOLAN-2-YL]METHOXY-HYDROXY-PHOSPHORYL] PHOSPHONO HYDROGEN PHOSPHATE
C12 H20 N4 O14 P3
LPHBJZOLBGBNJF-XYHAGOFUSA-O
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
B, D
NON-POLYMERH2 N

--

ACE
Query on ACE
B, D
NON-POLYMERC2 H4 O

--

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.233 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 60.662α = 90.00
b = 38.168β = 90.00
c = 121.758γ = 90.00
Software Package:
Software NamePurpose
PROTEUM2data reduction
REFMACrefinement
PHASERphasing
PROTEUM2data scaling

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: 2013-03-06
    Type: Database references