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Related Concept Videos

Protein Organization01:24

Protein Organization

8.5K
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.
The primary structure of a protein is its amino acid sequence....
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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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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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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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Protein Folding01:22

Protein Folding

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Overview
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Protein and Protein Structure02:15

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
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Related Experiment Video

Updated: Dec 3, 2025

Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae
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Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

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Protein Structure Analysis and Validation with X-Ray Crystallography.

Anastassios C Papageorgiou1, Nirmal Poudel2, Jesse Mattsson2

  • 1Turku Bioscience Centre, University of Turku and Åbo Akademi University, BioCity, Turku, Finland. anapap@utu.fi.

Methods in Molecular Biology (Clifton, N.J.)
|October 31, 2020
PubMed
Summary
This summary is machine-generated.

X-ray crystallography is key for determining protein structures, essential for applications in medicine and biotechnology. This method provides crucial three-dimensional protein insights for research and drug design.

Keywords:
CrystallizationData collectionProtein structureStructure determinationX-rays

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Protein Crystallization for X-ray Crystallography
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Protein Crystallization for X-ray Crystallography
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Area of Science:

  • Structural Biology
  • Biochemistry

Background:

  • X-ray crystallography is the primary method for protein structure determination, accounting for 85% of known structures.
  • Understanding protein 3D structures is vital for biotechnology, biomedicine, drug design, and basic research.
  • Crystallization requirements enhance protein purity and stability, benefiting broader research.

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:

  • Successful determination of protein three-dimensional structures.
  • Validation of protein modifications and ligand binding.

Conclusions:

  • X-ray crystallography is an indispensable tool for elucidating protein structures.
  • The technique supports advancements in drug discovery and biological research.