1ZEH

STRUCTURE OF INSULIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.159 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Interactions of phenol and m-cresol in the insulin hexamer, and their effect on the association properties of B28 pro --> Asp insulin analogues.

Whittingham, J.L.Edwards, D.J.Antson, A.A.Clarkson, J.M.Dodson, G.G.

(1998) Biochemistry 37: 11516-11523

  • DOI: 10.1021/bi980807s
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Insulin's natural tendency to form dimers and hexamers is significantly reduced in a mutant insulin B28 Pro --> Asp, which has been designed as a monomeric, rapid-acting hormone for therapeutic purposes. This molecule can be induced to form zinc hexa ...

    Insulin's natural tendency to form dimers and hexamers is significantly reduced in a mutant insulin B28 Pro --> Asp, which has been designed as a monomeric, rapid-acting hormone for therapeutic purposes. This molecule can be induced to form zinc hexamers in the presence of small phenolic derivatives which are routinely used as antimicrobial agents in insulin preparations. Two structures of B28 Asp insulin have been determined from crystals grown in the presence of phenol and m-cresol. In these crystals, insulin exists as R6 zinc hexamers containing a number of phenol or m-cresol molecules associated with aromatic side chains at the dimer-dimer interfaces. At the monomer-monomer interfaces, the B28 Pro --> Asp mutation leads to increased conformational flexibility in the B chain C termini, resulting in the loss of important intermolecular van der Waals contacts, thus explaining the monomeric character of B28 Asp insulin. The structure of a cross-linked derivative of B28 Asp insulin, containing an Ala-Lys dipeptide linker between residues B30 Ala and A1 Gly, has also determined. This forms an R6 zinc hexamer containing several m-cresol molecules. Of particular interest in this structure are two m-cresol molecules whose binding disrupted the beta-strand in one of the dimers. This observation suggests that the cross-link introduces mechanical strain on the B chain C terminus, thereby weakening the monomer-monomer interactions.


    Related Citations: 
    • Role of C-Terminal B-Chain Residues in Insulin Assembly: The Structure of Hexameric Lysb28Prob29-Human Insulin
      Ciszak, E.,Beals, J.M.,Frank, B.H.,Baker, J.C.,Carter, N.D.,Smith, G.D.
      (1995) Structure 3: 615
    • The Structure of a Rhombohedral R6 Insulin Hexamer that Binds Phenol
      Smith, G.D.,Dodson, G.G.
      (1992) Biopolymers 32: 441


    Organizational Affiliation

    Department of Chemistry, University of York, Heslington, England.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INSULIN
A, C
21Homo sapiensMutation(s): 0 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Go to Gene View: INS
Go to UniProtKB:  P01308
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
INSULIN
B, D
30Homo sapiensMutation(s): 1 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Go to Gene View: INS
Go to UniProtKB:  P01308
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CRS
Query on CRS

Download SDF File 
Download CCD File 
A, C, D
M-CRESOL
C7 H8 O
RLSSMJSEOOYNOY-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download SDF File 
Download CCD File 
B, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
B, D
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.159 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 77.490α = 90.00
b = 77.490β = 90.00
c = 38.910γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-12-09
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance