1GZR

Human Insulin-like growth factor; ESRF data


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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

  • Primary Citation of Related Structures:  

  • 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 reflect ...

    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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INSULIN-LIKE GROWTH FACTOR I
B
70Homo sapiensMutation(s): 0 
Gene Names: IGF1 (IBP1)
Find proteins for P05019 (Homo sapiens)
Go to Gene View: IGF1
Go to UniProtKB:  P05019
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C15
Query on C15

Download SDF File 
Download CCD File 
B
N-DODECYL-N,N-DIMETHYL-3-AMMONIO-1-PROPANESULFONATE
C17 H38 N O3 S
IZWSFJTYBVKZNK-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.237 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 30.777α = 90.00
b = 69.468β = 90.00
c = 65.003γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance