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Cryo-electron Microscopy01:28

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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...
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Light-coupled cryo-plunger for time-resolved cryo-EM.

Nate Yoder1, Farzad Jalali-Yazdi1, Sigrid Noreng1

  • 1Vollum Institute, Oregon Health & Science University, Portland, OR 97239, USA.

Journal of Structural Biology
|September 20, 2020
PubMed
Summary

Researchers developed a flash-plunger to capture rapid protein movements using cryo-electron microscopy. This tool enables the study of short-lived protein structures, advancing structural biology.

Keywords:
Cryo-EMCryo-electron microscopyManual cryo-plungerSingle particleTime-resolved

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Area of Science:

  • Structural Biology
  • Biophysics
  • Biochemistry

Background:

  • Proteins are dynamic molecules exhibiting conformational changes crucial for function.
  • Understanding these time-dependent structural dynamics is vital but challenging.
  • Existing methods limit the capture of transient protein states.

Purpose of the Study:

  • To develop a novel method for time-resolved structural determination of proteins.
  • To enable the capture of short-lived protein conformational states.
  • To integrate flash-photolysis with rapid cryo-vitrification.

Main Methods:

  • Development of a light-coupled cryo-plunger device.
  • Utilizing flash-photolysis of caged ligands to trigger conformational changes.
  • Rapid sample vitrification within milliseconds of stimulus delivery.
  • Application of single particle cryo-electron microscopy (cryo-EM).

Main Results:

  • The flash-plunger successfully immobilizes protein targets in vitreous ice.
  • Capture of protein conformations within a programmable time window as short as tens of milliseconds.
  • Demonstration of a method to access previously unobtainable short-lived conformational states.

Conclusions:

  • The flash-plunger is an effective tool for time-resolved cryo-EM studies.
  • This method opens new avenues for investigating protein dynamics.
  • It provides a simple, inexpensive, and flexible approach to structural biology.