Human Insulin-like growth factor; SRS Daresbury data

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.260 

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This is version 1.4 of the entry. See complete history


Structural Origins of the Functional Divergence of Human Insulin-Like Growth Factor-I and Insulin

Brzozowski, A.M.Dodson, E.J.Dodson, G.G.Murshudov, G.Verma, C.Turkenburg, J.P.De Bree, F.M.Dauter, Z.

(2002) Biochemistry 41: 9389

  • DOI: https://doi.org/10.1021/bi020084j
  • Primary Citation of Related Structures:  
    1GZR, 1GZY, 1GZZ, 1H02

  • PubMed Abstract: 

    Human insulin-like growth factors I and II (hIGF-I, hIGF-II) are potent stimulators of cell and growth processes. They display high sequence similarity to both the A and B chains of insulin but contain an additional connecting C-domain, which reflects their secretion without specific packaging or precursor conversion. IGFs also have an extension at the C-terminus known as the D-domain. This paper describes four homologous hIGF-1 structures, obtained from crystals grown in the presence of the detergent SB12, which reveal additional detail in the C- and D-domains. Two different detergent binding modes observed in the crystals may reflect different hIGF-I biological properties such as the interaction with IGF binding proteins and self-aggregation. While the helical core of hIGF-I is very similar to that in insulin, there are distinct differences in the region of hIGF-I corresponding to the insulin B chain C-terminus, residues B25-B30. In hIGF-I, these residues (24-29) and the following C-domain form an extensive loop protruding 20 A from the core, which results in a substantially different conformation for the receptor binding epitope in hIGF-I compared to insulin. One notable feature of the structures presented here is demonstration of peptide-bond cleavage between Ser35 and Arg36 resulting in an apparent gap between residues 35 and 39. The equivalent region of proinsulin is involved in hormone processing demanding a reassessment of the structural integrity of hIGF-I in relation to its biological function.

  • Organizational Affiliation

    Structural Biology Laboratory, Chemistry Department, University of York, Heslington, York YO10 5DD, United Kingdom. marek@ysbl.york.ac.uk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
INSULIN-LIKE GROWTH FACTOR IA [auth B]70Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P05019 (Homo sapiens)
Explore P05019 
Go to UniProtKB:  P05019
PHAROS:  P05019
GTEx:  ENSG00000017427 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05019
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on C15

Download Ideal Coordinates CCD File 
C17 H38 N O3 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.260 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 30.723α = 90
b = 69.282β = 90
c = 64.528γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-07-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-05-08
    Changes: Advisory, Data collection, Experimental preparation, Other
  • Version 1.4: 2023-12-13
    Changes: Advisory, Data collection, Database references, Refinement description