1GJG

Peptide Antagonist of IGFBP1, (i,i+8) Covalently Restrained Analog, Minimized Average Structure


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure-function analysis of a phage display-derived peptide that binds to insulin-like growth factor binding protein 1.

Skelton, N.J.Chen, Y.M.Dubree, N.Quan, C.Jackson, D.Y.Cochran, A.Zobel, K.Deshayes, K.Baca, M.Pisabarro, M.T.Lowman, H.B.

(2001) Biochemistry 40: 8487-8498

  • Primary Citation of Related Structures:  1GJE, 1GJF, 1IMW, 1IN2, 1IN3

  • PubMed Abstract: 
  • Highly structured, peptide antagonists of the interaction between insulin-like growth factor 1 (IGF-I) and IGF binding protein 1 (IGFBP-1) have recently been discovered by phage display of naïve peptide libraries [Lowman, H. B., et al. (1998) Biochem ...

    Highly structured, peptide antagonists of the interaction between insulin-like growth factor 1 (IGF-I) and IGF binding protein 1 (IGFBP-1) have recently been discovered by phage display of naïve peptide libraries [Lowman, H. B., et al. (1998) Biochemistry 37, 8870--8878]. We now report a detailed analysis of the features of this turn-helix peptide motif that are necessary for IGFBP-1 binding and structural integrity. Further rounds of phage randomization indicate the importance of residues contributing to a hydrophobic patch on one face of the helix. Alanine-scanning substitutions confirm that the hydrophobic residues are necessary for binding. However, structural analysis by NMR spectroscopy indicates that some of these analogues are less well folded. Structured, high-affinity analogues that lack the disulfide bond were prepared by introducing a covalent constraint between side chains at positions i and i + 7 or i + 8 within the helix. Analogues based on this scaffold demonstrate that a helical conformation is present in the bound state, and that hydrophobic side chains in this helix, and residues immediately preceding it, interact with IGFBP-1. By comparison of alanine scanning data for IGF-I and the turn-helix peptide, we propose a model for common surface features of these molecules that recognize IGFBP-1.


    Related Citations: 
    • Molecular Mimics of Insulin-like Growth Factor 1 (IGF-1) for Inhibiting IGF-1: IGF-Binding Protein Interactions
      Lowman, H.B.,Chen, Y.M.,Skelton, N.J.,Mortensen, D.L.,Tomlinson, E.E.,Sadick, M.D.,Robinson, I.C.,Clark, R.G.
      (1998) Biochemistry 37: 8870


    Organizational Affiliation

    Department of Protein Engineering, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA. skelly@gene.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
IGFBP-1 antagonist
A
14N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LNK
Query on LNK

Download SDF File 
Download CCD File 
A
PENTANE
C5 H12
OFBQJSOFQDEBGM-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

--

ACE
Query on ACE
A
NON-POLYMERC2 H4 O

--

Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-05-30
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance