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Microsecond time-resolved X-ray scattering by utilizing MHz repetition rate at second-generation XFELs.

Patrick E Konold1, Leonardo Monrroy2, Alfredo Bellisario1

  • 1Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden.

Nature Methods
|July 5, 2024
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Summary
This summary is machine-generated.

Researchers developed a new method using X-ray lasers to observe tiny protein structure changes in microseconds. This technique offers a clear view of biomolecular dynamics, crucial for biology and medicine.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Understanding rapid structural changes in biomolecules is vital for numerous scientific fields.
  • Existing methods often lack the speed or sensitivity to capture fleeting molecular dynamics.

Purpose of the Study:

  • To introduce a novel time-resolved X-ray scattering technique for detecting microsecond structural perturbations in biomolecules.
  • To demonstrate the application of this method in observing protein unfolding dynamics.

Main Methods:

  • Utilizing MHz repetition rates at X-ray free-electron lasers (XFELs).
  • Acquiring time-series data of protein scattering with ultra-low noise levels (0.001%).
  • Applying the technique to study the Jɑ helix unfolding of a light-oxygen-voltage photosensory domain.

Main Results:

  • Successfully generated microsecond time-series of protein scattering data.
  • Achieved exceptionally low noise levels, enabling sensitive detection of structural changes.
  • Provided direct observation of the Jɑ helix unfolding process.

Conclusions:

  • The developed MHz XFEL time-resolved scattering approach is effective for observing microsecond biomolecular dynamics.
  • This strategy is easy to implement and broadly applicable for studying various biochemical processes.
  • Offers a powerful new tool for direct observation of structural dynamics in biological systems.