4IDW

Polycrystalline T6 Bovine Insulin: Anisotropic Lattice Evolution and Novel Structure Refinement Strategy


Experimental Data Snapshot

  • Method: POWDER DIFFRACTION

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

High-resolution powder X-ray data reveal the T6 hexameric form of bovine insulin

Margiolaki, I.Giannopoulou, A.E.Wright, J.P.Knight, L.Norrman, M.Schluckebier, G.Fitch, A.N.Von Dreele, R.B.

(2013) Acta Crystallogr.,Sect.D 69: 978-990

  • DOI: 10.1107/S0907444913003867

  • PubMed Abstract: 
  • A series of bovine insulin samples were obtained as 14 polycrystalline precipitates at room temperature in the pH range 5.0-7.6. High-resolution powder X-ray diffraction data were collected to reveal the T6 hexameric insulin form. Sample homogeneity ...

    A series of bovine insulin samples were obtained as 14 polycrystalline precipitates at room temperature in the pH range 5.0-7.6. High-resolution powder X-ray diffraction data were collected to reveal the T6 hexameric insulin form. Sample homogeneity and reproducibility were verified by additional synchrotron measurements using an area detector. Pawley analyses of the powder patterns displayed pH- and radiation-induced anisotropic lattice modifications. The pronounced anisotropic lattice variations observed for T6 insulin were exploited in a 14-data-set Rietveld refinement to obtain an average crystal structure over the pH range investigated. Only the protein atoms of the known structure with PDB code 2a3g were employed in our starting model. A novel approach for refining protein structures using powder diffraction data is presented. In this approach, each amino acid is represented by a flexible rigid body (FRB). The FRB model requires a significantly smaller number of refinable parameters and restraints than a fully free-atom refinement. A total of 1542 stereochemical restraints were imposed in order to refine the positions of 800 protein atoms, two Zn atoms and 44 water molecules in the asymmetric unit using experimental data in the resolution range 18.2-2.7 Å for all profiles.


    Organizational Affiliation

    Department of Biology, Section of Genetics, Cell Biology and Development, University of Patras, GR-26500 Patras, Greece. imargiola@upatras.gr




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Insulin A chain
A, C
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 B chain
B, D
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 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

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

Experimental Data

  • Method: POWDER DIFFRACTION
Software Package:
Software NamePurpose
FIT2Ddata reduction
ID31sumdata scaling
MOLREPphasing
ID31sumdata collection
GSASrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-06-05
    Type: Initial release