1ZEI

CROSS-LINKED B28 ASP INSULIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.176 

wwPDB Validation   3D Report Full Report


This is version 1.3 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: https://doi.org/10.1021/bi980807s
  • Primary Citation of Related Structures:  
    1ZEG, 1ZEH, 1ZEI

  • 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 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.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
INSULIN
A, B, C, D, E
A, B, C, D, E, F
53Sus scrofaMutation(s): 1 
UniProt
Find proteins for P01315 (Sus scrofa)
Explore P01315 
Go to UniProtKB:  P01315
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01315
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CRS
Query on CRS

Download Ideal Coordinates CCD File 
G [auth A]
J [auth B]
M [auth C]
N [auth D]
O [auth E]
G [auth A],
J [auth B],
M [auth C],
N [auth D],
O [auth E],
P [auth E],
Q [auth F],
R [auth F]
M-CRESOL
C7 H8 O
RLSSMJSEOOYNOY-UHFFFAOYSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
H [auth B],
K [auth C]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
I [auth B],
L [auth C]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.176 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.952α = 90
b = 64.772β = 109.81
c = 48.914γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-02-16
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Derived calculations