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Related Concept Videos

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...
Determination of Crystal Structures01:29

Determination of Crystal Structures

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...
X-ray Crystallography02:18

X-ray Crystallography

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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Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
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Robust structural analysis of native biological macromolecules from multi-crystal anomalous diffraction data.

Qun Liu1, Qinglian Liu, Wayne A Hendrickson

  • 1New York Structural Biology Center, NSLS X4, Building 725, Brookhaven National Laboratory, Upton, NY 11973, USA.

Acta Crystallographica. Section D, Biological Crystallography
|June 25, 2013
PubMed
Summary

This study introduces a multi-crystal native single-wavelength anomalous diffraction (SAD) method for determining the structures of biological macromolecules. This approach enhances signal-to-noise ratios, enabling routine structure determination of native proteins containing only light atoms.

Keywords:
anomalous scatteringmultiple crystalsphase determinationsulfur SAD

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Area of Science:

  • Structural Biology
  • Biophysics
  • Crystallography

Background:

  • De novo structure determination of novel biological macromolecules often requires incorporating heavy atoms.
  • Current methods like selenomethionyl proteins with single- or multi-wavelength anomalous diffraction (SAD/MAD) are common, but SAD analyses with only light atoms (Zmax ≤ 20) are less frequent.
  • While metal ions and sulfur SAD are options, robust methods for light-atom-only structures are needed.

Purpose of the Study:

  • To develop and validate robust procedures for enhancing signal-to-noise in anomalous diffraction measurements.
  • To enable routine de novo structure determination of native macromolecules using only light atoms.
  • To demonstrate the applicability of multi-crystal native SAD for complex structures.

Main Methods:

  • A multi-crystal native SAD method was developed, combining data from multiple crystals at lower X-ray energies.
  • Data were collected from 5 to 13 crystals for each structure determination.
  • Statistical equivalence of crystals was rigorously tested, and elemental identities (Ca, Cl, S, P, Mg) were confirmed via f'' scattering-factor refinements.

Main Results:

  • The multi-crystal native SAD method was successfully applied to five structure determinations.
  • Substructures of 4 to 52 anomalous scatterers (Z ≤ 20) were determined, leading to full structures of 127 to 1200 residues.
  • High-resolution data (2.3–2.8 Å) were achieved, demonstrating the robustness of the method for light-atom-only macromolecules.

Conclusions:

  • Robust procedures for enhancing anomalous diffraction signals have been established.
  • The multi-crystal native SAD method facilitates routine structure determination of native macromolecules without heavy atom incorporation.
  • Optimized synchrotron beamlines for low-energy X-ray diffraction will further advance direct structural analysis of biological molecules.