4HTQ

Mitigation of X-ray damage in macromolecular crystallography by submicrometer line focusing; total dose 6.70 x 10e+11 X-ray photons

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.399 Å
  • R-Value Free: 0.163 
  • R-Value Work: 0.130 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

Mitigation of X-ray damage in macromolecular crystallography by submicrometre line focusing.

Finfrock, Y.Z., Stern, E.A., Alkire, R.W., Kas, J.J., Evans-Lutterodt, K., Stein, A., Duke, N., Lazarski, K., Joachimiak, A.

(2013) Acta Crystallogr.,Sect.D 69: 1463-1469

  • DOI: 10.1107/S0907444913009335
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Reported here are measurements of the penetration depth and spatial distribution of photoelectron (PE) damage excited by 18.6 keV X-ray photons in a lysozyme crystal with a vertical submicrometre line-focus beam of 0.7 µm full-width half-maximum (FWH ...

    Reported here are measurements of the penetration depth and spatial distribution of photoelectron (PE) damage excited by 18.6 keV X-ray photons in a lysozyme crystal with a vertical submicrometre line-focus beam of 0.7 µm full-width half-maximum (FWHM). The experimental results determined that the penetration depth of PEs is 5 ± 0.5 µm with a monotonically decreasing spatial distribution shape, resulting in mitigation of diffraction signal damage. This does not agree with previous theoretical predication that the mitigation of damage requires a peak of damage outside the focus. A new improved calculation provides some qualitative agreement with the experimental results, but significant errors still remain. The mitigation of radiation damage by line focusing was measured experimentally by comparing the damage in the X-ray-irradiated regions of the submicrometre focus with the large-beam case under conditions of equal exposure and equal volumes of the protein crystal, and a mitigation factor of 4.4 ± 0.4 was determined. The mitigation of radiation damage is caused by spatial separation of the dominant PE radiation-damage component from the crystal region of the line-focus beam that contributes the diffraction signal. The diffraction signal is generated by coherent scattering of incident X-rays (which introduces no damage), while the overwhelming proportion of damage is caused by PE emission as X-ray photons are absorbed.

    Organizational Affiliation: 

    Physics Department, University of Washington, Seattle, WA 98195, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Lysozyme C
A
129Gallus gallusMutation(s): 0 
Gene Names: LYZ
EC: 3.2.1.17
Find proteins for P00698 (Gallus gallus)
Go to Gene View: LYZ
Go to UniProtKB:  P00698
Small Molecules
Ligands 3 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
CL
Query on CL
Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO
Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.399 Å
  • R-Value Free: 0.163 
  • R-Value Work: 0.130 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 78.922α = 90.00
b = 78.922β = 90.00
c = 36.868γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
PHENIXrefinement
MOLREPphasing
DENZOdata reduction
SCALEPACKdata scaling
SBC-Collectdata collection

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-15
    Type: Initial release
  • Version 1.1: 2013-08-28
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Refinement description