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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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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Protein Crystallization for X-ray Crystallography
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Watching Proteins Function with Time-resolved X-ray Crystallography.

Vukica Šrajer1, Marius Schmidt2

  • 1Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL, USA.

Journal of Physics D: Applied Physics
|January 23, 2018
PubMed
Summary
This summary is machine-generated.

Time-resolved crystallography captures proteins in action using advanced X-ray techniques. This method, utilizing synchrotrons and X-ray free-electron lasers (XFELs), reveals protein dynamics at unprecedented speeds.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Biochemistry

Background:

  • Macromolecular crystallography has generated a large protein structure database, shifting focus to protein dynamics.
  • Understanding protein function requires studying dynamic processes, not just static structures.

Purpose of the Study:

  • To review state-of-the-art time-resolved crystallography at synchrotrons and X-ray free-electron lasers (XFELs).
  • To highlight the capabilities of these techniques for studying protein dynamics and reaction intermediates.
  • To outline challenges and future developments for broader applications in biomedical research.

Main Methods:

  • Time-resolved crystallography using short, intense X-ray pulses.
  • Synchrotron X-ray sources enabling 100 ps time resolution for reversible reactions.
  • X-ray free-electron lasers (XFELs) providing femtosecond pulses for ultra-fast event studies.

Main Results:

  • Synchrotron-based time-resolved crystallography is mature for light-initiated reactions.
  • XFELs open new frontiers for studying ultra-fast events on sub-picosecond timescales.
  • High-resolution structural data can be obtained for transient protein states.

Conclusions:

  • Time-resolved crystallography is essential for elucidating dynamic aspects of protein function.
  • Advancements at synchrotrons and XFELs significantly enhance capabilities for studying protein kinetics.
  • Further developments are needed to apply these powerful methods to a wider range of medically relevant proteins and enzymes.