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Related Experiment Video

Updated: Jan 28, 2026

Improving High Viscosity Extrusion of Microcrystals for Time-resolved Serial Femtosecond Crystallography at X-ray Lasers
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Resolving polymorphs and radiation-driven effects in microcrystals using fixed-target serial synchrotron

Ali Ebrahim1, Martin V Appleby2, Danny Axford2

  • 1School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England.

Acta Crystallographica. Section D, Structural Biology
|March 2, 2019
PubMed
Summary
This summary is machine-generated.

Determining high-quality microcrystal structures is challenging due to radiation damage. This study presents a method to separate crystal polymorphs and track X-ray damage in metalloproteins, enabling complete dataset determination.

Keywords:
fixed-target serial crystallographymetalloproteinspolymorphismradiation damageroom temperature

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Crystallography

Background:

  • High-quality structure determination in micro-crystallography faces challenges from radiation damage and crystal variations.
  • Metalloproteins are particularly susceptible to rapid X-ray-induced changes at their active sites, complicating structural analysis.
  • A multi-crystal approach is essential for obtaining complete datasets from microcrystals.

Purpose of the Study:

  • To develop and demonstrate an approach for resolving, separating, and determining structures of crystal polymorphs from microcrystals.
  • To track X-ray-induced structural changes and radiation damage within microcrystal populations.
  • To overcome challenges in obtaining complete datasets from variable and radiation-sensitive microcrystalline samples.

Main Methods:

  • Utilized a high-throughput, high-speed fixed-target approach for serial structure determination from microcrystals.
  • Employed robust data processing techniques to handle crystal-to-crystal variations and X-ray-induced changes.
  • Applied the method to a population of copper nitrite reductase microcrystals.

Main Results:

  • Successfully separated two distinct polymorphs of copper nitrite reductase with different unit-cell sizes.
  • Determined two independent structures corresponding to the separated polymorphs.
  • Tracked an X-ray-driven structural transformation between the identified polymorphs.

Conclusions:

  • The described approach enables the resolution and structure determination of crystal polymorphs from microcrystal samples.
  • It provides a means to monitor and understand X-ray-induced damage and transformations in sensitive samples like metalloproteins.
  • This method facilitates the acquisition of complete structural datasets from challenging microcrystalline materials.