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Crystallization of Membrane Proteins in Lipidic Mesophases

Crystallization of Membrane Proteins in Lipidic Mesophases

Published on: March 28, 2011

Plastic-embedded protein crystals.

Raimond B G Ravelli¹, Uta Haselmann-Weiss, John E McGeehan

¹EMBL Grenoble, 6 rue Jules Horowitz, BP 181, 38042 Grenoble CEDEX 9, France. ravelli@embl.fr

Journal of Synchrotron Radiation

|January 11, 2007

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This study shows freeze-substitution and plastic embedding preserve protein crystal diffraction properties for X-ray crystallography. This method prevents radiation damage, enabling detailed atomic analysis of biological samples.

Area of Science:

Structural Biology
Biophysics
Materials Science

Background:

Electron microscopy sample preparation often uses rapid vitrification, freeze substitution, and resin embedding.
This technique preserves cellular structures and allows room-temperature sectioning.
Its application to crystalline protein samples for X-ray crystallography is explored.

Purpose of the Study:

To investigate the feasibility of applying freeze-substitution and plastic embedding to crystalline protein samples.
To assess the preservation of diffraction properties after this preparation method.
To analyze the effects of X-ray radiation on plastic-embedded protein crystals.

Main Methods:

Crystalline protein samples underwent rapid vitrification.

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Crystallization of Membrane Proteins in Lipidic Mesophases

Crystallization of Membrane Proteins in Lipidic Mesophases

Published on: March 28, 2011

Production, Crystallization and Structure Determination of C. difficile PPEP-1 via Microseeding and Zinc-SAD

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Microcrystallography of Protein Crystals and In Cellulo Diffraction

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Vitrified water was replaced with a solvent via freeze substitution.

Samples were embedded in resin for room-temperature sectioning and X-ray diffraction.

Data were collected at a macromolecular crystallography synchrotron beamline.

Main Results:

Freeze-substituted and plastic-embedded crystals retained some original diffraction properties.
Complete room-temperature X-ray diffraction data sets were collected.
No radiation damage to disulfide bonds was observed, unlike with conventional methods.
Initial atomic analysis provided insights into the effects of the preparation technique.

Conclusions:

Freeze-substitution and plastic embedding are suitable for preparing protein crystals for X-ray crystallography.
This method preserves structural integrity and diffraction capabilities.
The technique offers advantages in mitigating radiation damage during data collection.