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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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 crystal...
X-ray Crystallography02:18

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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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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...
Cryo-electron Microscopy01:28

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Published on: November 5, 2018

Las estructuras de la difracción anómala de las macromoléculas biológicas nativas.

Qun Liu1, Tassadite Dahmane, Zhen Zhang

  • 1New York Structural Biology Center, National Synchrotron Light Source (NSLS) X4, Brookhaven National Laboratory, Upton, NY 11973, USA.

Science (New York, N.Y.)
|May 26, 2012
PubMed
Resumen

Este estudio introduce un nuevo método multicristalino de difracción anómala de una sola longitud de onda (SAD) para determinar las estructuras de las proteínas. Este enfoque utiliza la dispersión anómala nativa, eliminando la necesidad de incorporar átomos pesados, ofreciendo una alternativa más simple a los métodos tradicionales.

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Área de la Ciencia:

  • Biología Estructural Biología estructural.
  • La cristalografía es una técnica de cristalografía.
  • La biofísica es la biofísica.

Sus antecedentes:

  • Resolver el problema de la fase cristalográfica es crucial para la determinación de la estructura de novo de las nuevas macromoléculas biológicas.
  • Los métodos convencionales a menudo se basan en la incorporación de átomos pesados, como el uso de proteínas selenometionil para la difracción anómala de múltiples longitudes de onda (MAD) o los experimentos de difracción anómala de una sola longitud de onda (SAD).

Objetivo del estudio:

  • Desarrollar y validar un método de rutina para la determinación de la estructura cristalina de novo utilizando dispersión anómala intrínseca de macromoléculas nativas.
  • Proporcionar una alternativa a los experimentos de selenometionil SAD que eluden la necesidad de incorporar átomos pesados.

Principales métodos:

  • Desarrolló procedimientos robustos para mejorar la relación señal-ruido de la dispersión anómala nativa.
  • Se empleó un enfoque SAD multicristalino, combinando datos de múltiples cristales (5 a 13) a energías de rayos X más bajas.
  • Recogió datos a energías de rayos X más bajas de lo habitual para amplificar señales de dispersión anómalas.

Principales resultados:

  • Determinó con éxito las estructuras de proteínas nativas a resoluciones modestas (2,3 a 2,8 angstroms).
  • Aplicó el método a proteínas de diferentes tamaños (127 a 1148 residuos) y recuentos de átomos de azufre (3 a 28).
  • Determinación de la estructura de rutina demostrada sin necesidad de incorporación de átomos pesados.

Conclusiones:

  • El método SAD multicristalino que utiliza dispersión anómala intrínseca es una alternativa viable y atractiva para la determinación de la estructura de novo.
  • Esta técnica simplifica el proceso al eliminar el requisito de la derivación de átomos pesados, haciendo que la biología estructural sea más accesible.
  • Los hallazgos allanan el camino para una determinación más eficiente de la estructura de nuevas macromoléculas biológicas.