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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

118
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...
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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 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.
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X-ray Diffraction of Biological Samples01:10

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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

Protein Organization

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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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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Related Experiment Video

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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From protein structure to function via single crystal optical spectroscopy.

Luca Ronda1, Stefano Bruno2, Stefano Bettati3

  • 1Department of Neurosciences, University of Parma Parma, Italy.

Frontiers in Molecular Biosciences
|May 20, 2015
PubMed
Summary
This summary is machine-generated.

Crystallographic protein structures can be limited by artifacts. Spectroscopic methods, like UV-vis microspectrophotometry, offer functional insights into proteins in their crystalline state, aiding structure-function correlation.

Keywords:
X-ray crystallographyconformational changesmetastable intermediatemicrospectrophotometryprotein crystalstructure-function relationshipsynchrotron source

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • X-ray crystallography has elucidated over 100,000 protein structures, offering molecular-level insights into biological processes.
  • Crystallographic artifacts (e.g., conformational selection, radiation damage) can compromise electron density map quality and interpretation.
  • Limited functional data in the crystalline state raises questions about the validity of structure-based mechanisms.

Purpose of the Study:

  • To address limitations in interpreting crystallographic protein structures.
  • To explore the application of spectroscopic methods for characterizing proteins in the crystalline state.
  • To provide an overview of functional characterization using single crystal polarized absorption UV-vis microspectrophotometry.

Main Methods:

  • Application of spectroscopic methods including UV-vis spectrophotometry, spectrofluorimetry, IR, EPR, Raman, and resonance Raman spectroscopy.
  • Implementation of on-line instruments at X-ray synchrotron beamlines.
  • Detailed investigation using single crystal polarized absorption UV-vis microspectrophotometry for functional characterization.

Main Results:

  • Spectroscopic methods determine equilibrium and kinetic properties of proteins within crystals.
  • UV-vis microspectrophotometry is a key technique for functional analysis of crystalline proteins.
  • Studies on hemoglobins, pyridoxal 5'-phosphate dependent enzymes, and green fluorescent protein revealed structure-function correlations and limitations.

Conclusions:

  • Spectroscopic techniques enhance the functional relevance of protein crystal structures.
  • Single crystal UV-vis microspectrophotometry provides crucial data for understanding protein mechanisms.
  • This approach bridges structural information with functional insights, validating or refining proposed mechanisms.