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Towards RIP using free-electron laser SFX data.

Lorenzo Galli1, Sang Kil Son1, Thomas A White1

  • 1Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany.

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|February 28, 2015
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Summary
This summary is machine-generated.

Simulated serial femtosecond crystallography (SFX) data for cathepsin B can be phased using sulfur atom ionization. This radiation-damage-induced phasing (RIP) method is explored for current free-electron laser capabilities.

Keywords:
SFXX-ray FELphasingradiation damage

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Area of Science:

  • Structural biology
  • Biophysics
  • Crystallography

Background:

  • Serial femtosecond crystallography (SFX) is a powerful technique for determining protein structures.
  • Radiation damage is an inherent challenge in SFX experiments.
  • Phasing is crucial for solving the electron density map in crystallography.

Purpose of the Study:

  • To investigate the feasibility of phasing simulated native serial femtosecond crystallography (SFX) cathepsin B data.
  • To explore the impact of sulfur atom ionization on phasing.
  • To evaluate the effectiveness of radiation-damage-induced phasing (RIP) under current experimental conditions.

Main Methods:

  • Simulated native serial femtosecond crystallography (SFX) data for cathepsin B.
  • Rapid ionization of sulfur atoms for phasing.
  • Utilizing standard software for radiation-damage-induced phasing (RIP).
  • Exploring the effects of collected patterns and fluences.

Main Results:

  • Demonstrated successful phasing of simulated SFX cathepsin B data by rapid sulfur ionization.
  • Analyzed the influence of the number of collected patterns on substructure determination and phasing.
  • Investigated the impact of radiation fluences on phasing outcomes.
  • Validated the approach for experimental conditions at current free-electron laser facilities.

Conclusions:

  • Rapid ionization of sulfur atoms presents a viable method for phasing SFX data.
  • Radiation-damage-induced phasing (RIP) is a promising strategy for overcoming phasing challenges in SFX.
  • The findings support the application of this method at existing free-electron laser infrastructure.