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Measuring the nucleation rate of Lysozyme using microfluidics.

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Summary

This study introduces the PhaseChip, a microfluidic device for protein crystal nucleation studies. It enhances crystal yield and quality by controlling supersaturation and decoupling nucleation from growth.

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Area of Science:

  • Biophysics
  • Materials Science
  • Crystallography

Background:

  • Protein crystallization is crucial for structural biology but often suffers from low yield and quality.
  • Existing methods struggle to precisely control nucleation and growth phases independently.
  • Microfluidic technologies offer potential for enhanced control over crystallization conditions.

Purpose of the Study:

  • To introduce and validate the PhaseChip, a novel microfluidic device for studying protein crystal nucleation.
  • To demonstrate the ability to decouple protein crystal nucleation from growth using the PhaseChip.
  • To improve the yield and quality of protein crystals through controlled nucleation.

Main Methods:

  • Utilized the PhaseChip, a (poly)dimethylsiloxane (PDMS) microfluidic device with dual fluidic channels separated by a water-permeable membrane.
  • Controlled protein supersaturation by reversibly adjusting the chemical potential of salt reservoirs.
  • Employed lysozyme and sodium chloride as a model system for nucleation studies.

Main Results:

  • The PhaseChip successfully decoupled nucleation and growth, leading to improved protein crystal yield and quality.
  • Demonstrated precise control over protein supersaturation within nanoliter droplets.
  • Quantified protein crystal nucleation rates as a function of supersaturation.

Conclusions:

  • The PhaseChip is an effective tool for statistical studies of protein crystal nucleation.
  • This microfluidic approach offers significant advantages for optimizing protein crystallization processes.
  • The ability to control supersaturation is key to enhancing crystal nucleation and quality.