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Related Experiment Video

Updated: Jun 24, 2026

Improving the Success Rate of Protein Crystallization by Random Microseed Matrix Screening
12:24

Improving the Success Rate of Protein Crystallization by Random Microseed Matrix Screening

Published on: August 31, 2013

Microseeding - a powerful tool for crystallizing proteins complexed with hydrolyzable substrates.

Christine Oswald1, Sander H J Smits1, Erhard Bremer2

  • 1Institute of Biochemistry, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225 Duesseldorf, Germany.

International Journal of Molecular Sciences
|March 28, 2009
PubMed
Summary

Hydrolysis of acetylcholine often prevents crystallization of the choline substrate binding protein (ChoX). A new microseeding method rapidly crystallizes ChoX with acetylcholine, overcoming this hydrolysis challenge.

Keywords:
acetylchline binding proteinco-crystallizationcrystal twinning

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Crystallography

Background:

  • Protein crystallization is crucial for structural determination but hindered by ligand hydrolysis.
  • Non-enzymatic hydrolysis of unstable ligands, like acetylcholine, is common during lengthy crystallization processes, especially at non-neutral pH.
  • The substrate binding protein ChoX crystallized with acetylcholine, but only the hydrolysis product, choline, was observed in the binding site.

Purpose of the Study:

  • To overcome the obstacle of ligand hydrolysis during protein crystallization.
  • To develop a method for obtaining crystals of ChoX with bound acetylcholine.

Main Methods:

  • Devised a microseeding protocol for protein crystallization.
  • Applied the microseeding protocol to the ChoX-acetylcholine system.

Main Results:

  • Successfully obtained crystals of ChoX with bound acetylcholine within 24 hours.
  • The microseeding protocol significantly reduced crystallization time compared to conventional methods.
  • Rapid crystal growth led to a high twinning fraction, suggesting a need for optimization.

Conclusions:

  • Microseeding is an effective strategy to circumvent ligand hydrolysis in protein crystallization.
  • Rapid crystallization protocols can yield high-quality crystals but may require further optimization to minimize defects like twinning.