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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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X-ray Diffraction of Biological Samples01:10

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Racemic Mixtures and the Resolution of Enantiomers02:30

Racemic Mixtures and the Resolution of Enantiomers

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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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Updated: Feb 25, 2026

Protein Crystallization for X-ray Crystallography
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Protein Structure Determination by Racemic and Quasi-Racemic X-Ray Crystallography.

Stephen B H Kent1

  • 1Department of Chemistry, Department of Biochemistry & Molecular Biology, The University of Chicago, Chicago, Illinois, USA.

Chembiochem : a European Journal of Chemical Biology
|February 23, 2026
PubMed
Summary
This summary is machine-generated.

Racemic protein crystallography, using mixtures of L- and D-protein enantiomers, significantly improves the success rate for determining protein structures via X-ray diffraction, even for difficult proteins.

Keywords:
X‐ray crystallographychemical ligationchemical protein synthesismirror image proteinsprotein structure

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Crystallography

Background:

  • Determining protein molecular structures is crucial for understanding biological functions.
  • Conventional X-ray diffraction methods face challenges, especially with recalcitrant proteins.
  • Racemic crystallography offers a novel approach to overcome these limitations.

Purpose of the Study:

  • To review fundamental aspects of racemic protein crystallography.
  • To highlight the advantages of using racemic mixtures for protein structure determination.
  • To illustrate the utility of this technique with literature examples.

Main Methods:

  • Crystallization of proteins from racemic mixtures of enantiomers (L- and D-proteins).
  • Utilizing quasi-racemic mixtures of protein isomorphs.
  • Preparation of D-protein molecules via total synthesis and chemical ligation.

Main Results:

  • Racemic mixtures yield highly ordered, centrosymmetric crystals with increased success rates.
  • This method facilitates crystallization of proteins previously recalcitrant to conventional techniques.
  • Centrosymmetric crystals simplify structure solution and yield high-quality electron density maps.

Conclusions:

  • Racemic protein crystallography is a powerful technique for enhancing protein structure determination.
  • It offers significant advantages over conventional methods, particularly for challenging proteins.
  • The approach simplifies data analysis and improves the quality of structural results.