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A fully automated crystallization apparatus for small protein quantities.

Ryuichi Kato1, Masahiko Hiraki2, Yusuke Yamada1

  • 1Structural Biology Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan.

Acta Crystallographica. Section F, Structural Biology Communications
|January 13, 2021
PubMed
Summary

The upgraded Protein Crystallization and Monitoring System (PXS2) enables automated screening of challenging protein crystallization conditions using minimal sample volumes. This advanced system supports membrane protein studies via bicelle and lipidic cubic phase methods, accelerating X-ray crystallography.

Keywords:
automationcrystallizationhigh-throughputmembrane proteins

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Crystallography

Background:

  • The initial Protein Crystallization and Monitoring System (PXS) was developed in 2003 for high-throughput structural genomics.
  • User needs have evolved, emphasizing the study of difficult proteins and membrane proteins.

Purpose of the Study:

  • To upgrade the PXS system to PXS2 to meet current demands in protein crystallography.
  • To enhance capabilities for screening crystallization conditions with small protein amounts and for membrane protein targets.

Main Methods:

  • Automated setup and monitoring of protein crystallization using vapor diffusion.
  • Upgraded PXS2 features include a 0.1 µl minimum dispenser volume and 5-megapixel image resolution.
  • Incorporation of 4°C incubation and specialized methods for membrane protein crystallization (bicelle and lipidic cubic phase).

Main Results:

  • PXS2 significantly reduces sample volume requirements for crystallization screening.
  • Enhanced image resolution allows detailed observation of small crystal drops.
  • The system now supports advanced techniques like the bicelle and lipidic cubic phase methods for membrane proteins.

Conclusions:

  • The PXS2 system represents a significant advancement in automated protein crystallization.
  • It addresses the need for studying challenging targets, including membrane proteins, with reduced sample volumes.
  • PXS2 effectively reduces bottlenecks in X-ray protein crystallography workflows.