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Updated: Jun 13, 2026
08:48
High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
Published on: April 28, 2022
Assessing protein-specific radiation damage in time-resolved X-ray solution-scattering experiments at high-brilliance
Fatemeh Sabzian-Molaei1, Tomás S Plivelic2, Magnus Andersson1
1Department of Chemistry, Umeå University, Umeå, Sweden.
Acta Crystallographica. Section D, Structural Biology
|June 12, 2026
Summary
Time-resolved X-ray solution scattering (TR-XSS) requires careful dose management to prevent radiation damage. Beam focusing significantly impacts sample integrity, with detector-focused conditions preserving protein stability better than sample-focused conditions.
Area of Science:
- Structural Biology
- Biophysical Chemistry
- X-ray Scattering
Background:
- Time-resolved X-ray solution scattering (TR-XSS) is crucial for studying protein dynamics.
- Continuous X-ray exposure at multipurpose small-angle X-ray scattering (SAXS) beamlines can induce radiation damage.
- Understanding radiation effects is vital for reliable TR-XSS experiments.
Purpose of the Study:
- To systematically assess factors influencing adenylate kinase (AdK) stability during TR-XSS.
- To determine optimal experimental parameters for minimizing radiation damage.
- To establish practical dose limits for TR-XSS at multipurpose SAXS beamlines.
Main Methods:
- Performed static SAXS measurements to determine suitable protein concentrations.
- Investigated AdK stability under varying X-ray doses and exposure times.
- Compared TR-XSS results under detector-focused versus sample-focused beam conditions.
Main Results:
- Adenylate kinase (AdK) showed minimal interparticle effects at concentrations up to 21 mg/ml.
- AdK remained stable up to 3.13 kGy under detector-focused conditions.
- Sample-focused conditions increased absorbed dose to 21.3 kGy, causing significant radiation damage.
Conclusions:
- Protein concentration and beam focusing are critical determinants of sample integrity in TR-XSS.
- Established system-specific dose limits and guidelines for minimizing radiation artifacts.
- The presented workflow aids in performing reliable TR-XSS on multipurpose SAXS beamlines.
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