2A3G

The structure of T6 bovine insulin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The structure of T6 bovine insulin.

Smith, G.D.Pangborn, W.A.Blessing, R.H.

(2005) Acta Crystallogr D Biol Crystallogr 61: 1476-1482

  • DOI: 10.1107/S0907444905025771
  • Primary Citation of Related Structures:  
    2A3G

  • PubMed Abstract: 
  • Porcine insulin differs in sequence from bovine insulin at residues A8 (Thr in porcine-->Ala in bovine) and A10 (Ile in porcine-->Val in bovine). The structure of T6 hexameric bovine insulin has been determined to 2.25 A resolution at room temperatur ...

    Porcine insulin differs in sequence from bovine insulin at residues A8 (Thr in porcine-->Ala in bovine) and A10 (Ile in porcine-->Val in bovine). The structure of T6 hexameric bovine insulin has been determined to 2.25 A resolution at room temperature and refined to a residual of 0.162. The structure of the independent dimer is nearly identical to the T6 porcine insulin dimer: the mean displacement of all backbone atoms is 0.16 A, with the largest displacements occurring at AlaB30. Each of two independent zinc ions is octahedrally coordinated by three HisB10 side chains and three water molecules. As has been observed in both human and porcine insulin, the GluB13 side chains are directed towards the center of the hexamer, where a short contact of 2.57 A occurs between two independent carboxyl O atoms, again suggesting the presence of a centered hydrogen bond. No significant displacements of backbone atoms or changes in conformation are observed at A8 or A10. Since there are no interhexamer hydrogen-bonded contacts involving A8 in either porcine or bovine insulin, the change in the identity of this residue appears to have little or no effect upon the packing of the hexamers in the unit cell. In contrast, the side chains of the three A10 residues in one trimer make van der Waals contacts with the A10 side chains in a translationally related hexamer. As a consequence of the loss of the C(delta1) atom from the isoleucine residue in porcine insulin to produce valine in bovine insulin, there is a 0.36 A decrease in the distance between independent pairs of C(beta) atoms and a 0.24 A decrease in the c dimension of the unit cell. Thus, the net effect of the change in sequence at A10 is to strengthen the stabilizing hydrophobic interactions between hexamers.


    Related Citations: 
    • The structure of 2Zn pig insulin crystals at 1.5 A resolution
      Baker, E.N., Blundell, T.L., Cutfield, J.F., Cutfield, S.M., Dodson, E.J., Dodson, G.G., Hodgkin, D.M., Hubbard, R.E., Issacs, N.W., Reynolds, C.D., Sakabe, K., Sakabe, N., Vijayan, N.M.
      (1988) Philos Trans R Soc London,ser B 319: 369
    • The structure of T6 human insulin at 1.0 A resolution
      Smith, G.D., Pangborn, W.A., Blessing, R.H.
      (2003) Acta Crystallogr D Biol Crystallogr 59: 474
    • Lessons from an aged, dried crystal of T(6) human insulin
      Smith, G.D., Blessing, R.H.
      (2003) Acta Crystallogr D Biol Crystallogr 59: 1384

    Organizational Affiliation

    Structural Biology and Biochemistry, Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada. gdsmith@sickkids.ca



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
InsulinAC21Bos taurusMutation(s): 0 
Gene Names: INS
Find proteins for P01317 (Bos taurus)
Explore P01317 
Go to UniProtKB:  P01317
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
InsulinBD30Bos taurusMutation(s): 0 
Gene Names: INS
Find proteins for P01317 (Bos taurus)
Explore P01317 
Go to UniProtKB:  P01317
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
B, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.162 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.554α = 90
b = 82.554β = 90
c = 33.756γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance