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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

135
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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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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Protein Organization01:24

Protein Organization

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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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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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Related Experiment Video

Updated: May 2, 2026

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
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Protein structure validation and analysis with X-ray crystallography.

Anastassios C Papageorgiou1, Jesse Mattsson

  • 1Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, BioCity, Tykistökatu 6, Turku, 20521, Finland, tassos.papageorgiou@btk.fi.

Methods in Molecular Biology (Clifton, N.J.)
|March 21, 2014
PubMed
Summary
This summary is machine-generated.

X-ray crystallography is a key method for determining protein structures, essential for biotechnology and drug design. This technique provides valuable insights into protein function and validation.

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Area of Science:

  • Structural Biology
  • Biochemistry

Background:

  • X-ray crystallography is the primary method for protein structure determination, accounting for approximately 85% of known protein structures.
  • Understanding protein 3D structure is crucial for applications in biotechnology, biomedicine, drug design, and fundamental research.
  • The process necessitates pure, homogeneous, and stable protein solutions, aiding other protein research areas.

Purpose of the Study:

  • To describe the technique of X-ray protein crystallography.
  • To outline the essential steps for successful 3D crystal structure determination.

Main Methods:

  • X-ray diffraction analysis of protein crystals.
  • Data collection and processing.
  • 3D model building and refinement.

Main Results:

  • Detailed explanation of the X-ray crystallography process.
  • Identification of critical steps for achieving high-resolution protein structures.

Conclusions:

  • X-ray crystallography is a powerful and indispensable technique for elucidating protein structures.
  • The methodology supports advancements in drug discovery, protein engineering, and understanding biological mechanisms.