2BN1

Insulin after a high dose x-ray burn


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.131 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Improving Radiation-Damage Substructures for Rip.

Nanao, M.H.Sheldrick, G.M.Ravelli, R.B.G.

(2005) Acta Crystallogr.,Sect.D 61: 1227

  • DOI: 10.1107/S0907444905019360
  • Primary Citation of Related Structures:  
  • Also Cited By: 3N03, 3N02, 3MZR, 3MZQ

  • PubMed Abstract: 
  • Specific radiation damage can be used to solve macromolecular structures using the radiation-damage-induced phasing (RIP) method. The method has been investigated for six disulfide-containing test structures (elastase, insulin, lysozyme, ribonuclease ...

    Specific radiation damage can be used to solve macromolecular structures using the radiation-damage-induced phasing (RIP) method. The method has been investigated for six disulfide-containing test structures (elastase, insulin, lysozyme, ribonuclease A, trypsin and thaumatin) using data sets that were collected on a third-generation synchrotron undulator beamline with a highly attenuated beam. Each crystal was exposed to the unattenuated X-ray beam between the collection of a 'before' and an 'after' data set. The X-ray 'burn'-induced intensity differences ranged from 5 to 15%, depending on the protein investigated. X-ray-susceptible substructures were determined using the integrated direct and Patterson methods in SHELXD. The best substructures were found by downscaling the 'after' data set in SHELXC by a scale factor K, with optimal values ranging from 0.96 to 0.99. The initial substructures were improved through iteration with SHELXE by the addition of negatively occupied sites as well as a large number of relatively weak sites. The final substructures ranged from 40 to more than 300 sites, with strongest peaks as high as 57sigma. All structures except one could be solved: it was not possible to find the initial substructure for ribonuclease A, however, SHELXE iteration starting with the known five most susceptible sites gave excellent maps. Downscaling proved to be necessary for the solution of elastase, lysozyme and thaumatin and reduced the number of SHELXE iterations in the other cases. The combination of downscaling and substructure iteration provides important benefits for the phasing of macromolecular structures using radiation damage.


    Organizational Affiliation

    EMBL, 6 Rue Jules Horowitz, 38042 Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INSULIN A CHAIN
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 B CHAIN
B
30Bos taurusMutation(s): 0 
Gene Names: INS
Find proteins for P01317 (Bos taurus)
Go to Gene View: INS
Go to UniProtKB:  P01317
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.131 
  • Space Group: I 21 3
Unit Cell:
Length (Å)Angle (°)
a = 77.900α = 90.00
b = 77.900β = 90.00
c = 77.900γ = 90.00
Software Package:
Software NamePurpose
SHELXDphasing
REFMACrefinement
XDSdata reduction
SHELXEphasing
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-09-07
    Type: Initial release
  • Version 1.1: 2013-04-03
    Type: Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance