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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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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.
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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution
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Using Small-angle X-ray Scattering to Characterize Biological Systems: A General Overview and Practical Tips.

João Paquete-Ferreira1,2, Francisco Leisico1,2,3, Márcia A S Correia1,2

  • 1Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica, Portugal.

Methods in Molecular Biology (Clifton, N.J.)
|April 24, 2023
PubMed
Summary

Small-angle X-ray Scattering (SAXS) is a versatile technique for studying biomolecules in solution, providing insights into size, shape, and dynamics. This guide details SAXS methodology, sample preparation, and data analysis for successful experiments.

Keywords:
Data analysisProtein characterizationSample preparationSmall-angle X-ray Scattering (SAXS)Structural Biology

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Small-angle X-ray Scattering (SAXS) is a widely applicable technique for structural characterization.
  • Advancements in hardware and software have increased SAXS popularity and reliability.
  • SAXS is suitable for studying flexible and dynamic systems in solution, including proteins and biomolecules.

Purpose of the Study:

  • To provide a concise overview of SAXS methodology.
  • To systematically outline key steps in SAXS experiments: sample preparation, data collection, processing, and analysis.
  • To offer practical guidance for overcoming common challenges in SAXS experiments.

Main Methods:

  • Overview of Small-angle X-ray Scattering (SAXS) principles.
  • Detailed description of experimental procedures for sample preparation and data collection.
  • Explanation of data processing and analysis techniques for SAXS data.

Main Results:

  • SAXS provides information on particle size and shape in solution.
  • The technique is applicable to a wide range of particle sizes, with no limitations.
  • SAXS can reveal insights into folding-unfolding, conformational changes, and complex formation.

Conclusions:

  • SAXS is a powerful and versatile tool for studying biomolecular structure and dynamics.
  • This chapter serves as a practical guide for users to design and conduct successful SAXS experiments.
  • Understanding the methodology and potential pitfalls is crucial for obtaining reliable SAXS data.