1CPH

CONFORMATIONAL CHANGES IN CUBIC INSULIN CRYSTALS IN THE PH RANGE 7-11

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å

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This is version 1.3 of the entry. See complete history. 

Literature

Conformational changes in cubic insulin crystals in the pH range 7-11.

Gursky, O., Badger, J., Li, Y., Caspar, D.L.

(1992) Biophys.J. 63: 1210-1220

  • DOI: 10.1016/S0006-3495(92)81697-1
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • To determine the effect of variations in the charge distribution on the conformation of a protein molecule, we have solved the structures of bovine cubic insulin over a pH range from 7 to 11 in 0.1 M and 1 M sodium salt solutions. The x-ray data were ...

    To determine the effect of variations in the charge distribution on the conformation of a protein molecule, we have solved the structures of bovine cubic insulin over a pH range from 7 to 11 in 0.1 M and 1 M sodium salt solutions. The x-ray data were collected beyond 2-A resolution and the R factors for the refined models ranged from 0.16 to 0.20. Whereas the positions of most protein and well-ordered solvent atoms are conserved, about 30% of residues alter their predominant conformation as the pH is changed. Conformational switching of A5 Gln and B10 His correlates with the pH dependence of monovalent cation binding to insulin in cubic crystals. Shifts in the relative positions of the A chain NH2-terminal and B chain COOH-terminal groups are probably due to titration of the A1 alpha-amino group. Two alternative positions of B25 Phe and A21 Asn observed in cubic insulin at pH 11 are similar to those found in two independent molecules of the 2Zn insulin dimer at pH 6.4. The conformational changes of the insulin amino acids appear to be only loosely coupled at distant protein sites. Shifts in the equilibrium between distinct conformational substates as the charge distribution on the protein is altered are analogous to the electrostatically triggered movements that occur in many functional protein reactions.

    Related Citations: 
    • Structure of the Pig Insulin Dimer in the Cubic Crystal
      Badger, J.,Harris, M.R.,Reynolds, C.D.,Evans, A.C.,Dodson, E.J.,Dodson, G.G.,North, A.C.T.
      (1991) Acta Crystallogr.,Sect.B 47: 127
    • Water Structure in Cubic Insulin Crystals
      Badger, J.,Caspar, D.L.D.
      (1991) Proc.Natl.Acad.Sci.USA 88: 622
    • Zinc-Free Cubic Pig Insulin: Crystallization and Structure Determination
      Dodson, E.J.,Dodson, G.G.,Lewitova, A.,Sabesan, M.
      (1978) J.Mol.Biol. 125: 387
    • Flexibility in Crystalline Insulins
      Badger, J.
      (1992) Biophys.J. 61: 816
    • Monovalent Cation Binding in Cubic Insulin Crystals
      Gursky, O.,Li, Y.,Badger, J.,Caspar, D.L.D.
      (1992) Biophys.J. 61: 604

    Organizational Affiliation: 

    Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts 02254-9110.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INSULIN (PH 10)
A
21Bos taurusMutation(s): 0 
Gene Names: INS
Find proteins for P01317 (Bos taurus)
Go to Gene View: INS
Go to UniProtKB:  P01317
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
INSULIN (PH 10)
B
30Bos taurusMutation(s): 0 
Gene Names: INS
Find proteins for P01317 (Bos taurus)
Go to Gene View: INS
Go to UniProtKB:  P01317
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA
Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
DCE
Query on DCE
Download SDF File 
Download CCD File 
B
1,2-DICHLOROETHANE
ETHYLENE DICHLORIDE
C2 H4 Cl2
WSLDOOZREJYCGB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • Space Group: I 21 3
Unit Cell:
Length (Å)Angle (°)
a = 78.900α = 90.00
b = 78.900β = 90.00
c = 78.900γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1993-01-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other