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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 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

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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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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.
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Protein Crystallization for X-ray Crystallography
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Protein Crystallization for X-ray Crystallography

Published on: January 16, 2011

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Determining Protein Structures Using X-Ray Crystallography.

Subhash Narasimhan1

  • 1Central European Institute of Technology (CEITEC), Masaryk University, Brno, Czech Republic.

Methods in Molecular Biology (Clifton, N.J.)
|April 24, 2024
PubMed
Summary
This summary is machine-generated.

X-ray crystallography determines protein 3D structures using X-ray diffraction. This guide details the gene-to-structure pipeline, addressing challenges for accurate protein structure determination.

Keywords:
CCP4CootCryoprotectantCrystallizationData collectionData reductionIndexingMolecular replacementPDBPhasingProtein homogeneityProtein stabilitySalt crystalScalingStructure refinementTwinningXDS

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Molecular Biology

Background:

  • X-ray crystallography is a key technique for atomic-scale protein structure determination.
  • Challenges include protein purity, crystallization efficiency, and crystal quality, impacting high-resolution structure achievement.

Purpose of the Study:

  • To provide a comprehensive overview of the X-ray crystallography pipeline from gene to protein structure.
  • To detail critical steps: protein crystallization, data collection, processing, structure determination, and refinement.
  • To address common challenges and emphasize standardized protocols for reproducibility and accuracy.

Main Methods:

  • Detailed explanation of the gene-to-structure determination pipeline in X-ray crystallography.
  • Coverage of protein crystallization, X-ray diffraction data collection, and computational analysis.
  • Discussion of structure refinement and common procedural hurdles.

Main Results:

  • The chapter outlines the complete workflow for determining protein structures via X-ray crystallography.
  • It identifies key challenges encountered during the process.
  • It highlights the necessity of standardized protocols for reliable results.

Conclusions:

  • Understanding the complete X-ray crystallography pipeline is crucial for advancing protein structure and function studies.
  • Addressing challenges and implementing standardized protocols enhances the accuracy and reproducibility of structural data.
  • This methodology is vital for detailed insights into protein architecture.