1RMJ

C-terminal domain of insulin-like growth factor (IGF) binding protein-6: structure and interaction with IGF-II


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.2 of the entry. See complete history


Literature

C-terminal domain of insulin-like growth factor (IGF) binding protein-6: structure and interaction with IGF-II.

Headey, S.J.Keizer, D.W.Yao, S.Brasier, G.Kantharidis, P.Bach, L.A.Norton, R.S.

(2004) Mol Endocrinol 18: 2740-2750

  • DOI: 10.1210/me.2004-0248
  • Primary Citation of Related Structures:  
    1RMJ

  • PubMed Abstract: 
  • IGFs are important mediators of growth. IGF binding proteins (IGFBPs) 1-6 regulate IGF actions and have IGF-independent actions. The C-terminal domains of IGFBPs contribute to high-affinity IGF binding and modulation of IGF actions and confer some IGF-independent properties, but understanding how they achieve this has been constrained by the lack of a three-dimensional structure ...

    IGFs are important mediators of growth. IGF binding proteins (IGFBPs) 1-6 regulate IGF actions and have IGF-independent actions. The C-terminal domains of IGFBPs contribute to high-affinity IGF binding and modulation of IGF actions and confer some IGF-independent properties, but understanding how they achieve this has been constrained by the lack of a three-dimensional structure. We therefore determined the solution structure of the C-domain of IGFBP-6 using nuclear magnetic resonance (NMR). The domain consists of a thyroglobulin type 1 fold comprising an alpha-helix followed by a loop, a three-stranded antiparallel beta-sheet incorporating a second loop, and finally a disulfide-bonded flexible third loop. The IGF-II binding site on the C-domain was identified by examining NMR spectral changes upon complex formation. It consists of a largely hydrophobic surface patch involving the alpha-helix, the first beta-strand, and the first and second loops. The site was confirmed by mutagenesis of several residues, which resulted in decreased IGF binding affinity. The IGF-II binding site lies adjacent to surfaces likely to be involved in glycosaminoglycan binding of IGFBPs, which might explain their decreased IGF affinity when bound to glycosaminoglycans, and nuclear localization. Our structure provides a framework for understanding the roles of IGFBP C-domains in modulating IGF actions and conferring IGF-independent actions, as well as ultimately for the development of therapeutic IGF inhibitors for diseases including cancer.


    Related Citations: 
    • 1H, 13C and 15N resonance assignments of the C-terminal domain of insulin-like growth factor binding protein-6 (IGFBP-6).
      Headey, S.J., Yao, S., Parker, N.J., Kantharidis, P., Bach, L.A., Norton, R.S.
      (2003) J Biomol NMR 25: 251
    • Binding site for the C-domain of insulin-like growth factor (IGF) binding protein-6 on IGF-II; implications for inhibition of IGF actions.
      Headey, S.J., Keizer, D.W., Yao, S., Wallace, J.C., Bach, L.A., Norton, R.S.
      (2004) FEBS Lett 568: 19
    • C-Terminal Domain of Insulin-like Growth Factor (IGF) Binding Protein 6: Conformational Exchange and Its Correlation with IGF-II Binding
      Yao, S., Headey, S.J., Keizer, D.W., Bach, L.A., Norton, R.S.
      (2004) Biochemistry 43: 11187

    Organizational Affiliation

    The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville 3050, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin-like growth factor binding protein 6 A107Homo sapiensMutation(s): 0 
Gene Names: IGFBP6IBP6
Find proteins for P24592 (Homo sapiens)
Explore P24592 
Go to UniProtKB:  P24592
NIH Common Fund Data Resources
PHAROS:  P24592
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 1RMJ Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-09-14
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance