2ZPP

Neutron crystal structure of cubic insulin at pD9


Experimental Data Snapshot

  • Method: NEUTRON DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

An abnormal pK(a) value of internal histidine of the insulin molecule revealed by neutron crystallographic analysis

Ishikawa, T.Chatake, T.Morimoto, Y.Maeda, M.Kurihara, K.Tanaka, I.Niimura, N.

(2008) Biochem Biophys Res Commun 376: 32-35

  • DOI: 10.1016/j.bbrc.2008.08.071
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Insulin is stored in pancreatic beta-cell as hexameric form with Zn2+ ions, while the hormonally active form is monomer. The hexamer requires the coordination of Zn2+ ions to the HisB10. In order to reveal the mechanism of the hexamerization of insul ...

    Insulin is stored in pancreatic beta-cell as hexameric form with Zn2+ ions, while the hormonally active form is monomer. The hexamer requires the coordination of Zn2+ ions to the HisB10. In order to reveal the mechanism of the hexamerization of insulin, we investigated the Zn2+ free insulin at pD6.6 and pD9 by neutron crystallographic analyses. HisB10 is doubly protonated not only at pD6.6 but also at pD9, indicating an abnormal pK(a) of this histidine. It is suggested that HisB10 acts on a strong cation capture and contributes to the high stability of the hexameric form in pancreas.


    Organizational Affiliation

    Kyoto University Research Reactor, Asashironishi 2, Kumatori, Osaka 590-0494, Japan.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Insulin A chain
A
21Sus scrofaMutation(s): 0 
Gene Names: INS
Find proteins for P01315 (Sus scrofa)
Go to UniProtKB:  P01315

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Insulin B chain
B
30Sus scrofaMutation(s): 0 
Gene Names: INS
Find proteins for P01315 (Sus scrofa)
Go to UniProtKB:  P01315
Experimental Data & Validation

Experimental Data

  • Method: NEUTRON DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.222 
  • Space Group: I 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.04α = 90
b = 79.04β = 90
c = 79.04γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-10-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2013-08-21
    Changes: Other
  • Version 1.3: 2018-03-07
    Changes: Data collection