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Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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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Structure and conformational changes in NSF and its membrane receptor complexes visualized by quick-freeze/deep-etch

P I Hanson1, R Roth, H Morisaki

  • 1Department of Pharmacology and HHMI, Yale University School of Medicine, New Haven, CT 06510, USA.

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Summary

The NSF ATPase, crucial for membrane fusion, forms a hollow cylinder whose shape changes with nucleotide binding. This structural insight reveals how NSF interacts with the SNARE complex to mediate membrane fusion.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cell Biology

Background:

  • Membrane fusion is a critical cellular process.
  • The N-ethylmaleimide-sensitive factor (NSF) ATPase and the SNARE complex are key regulators of membrane fusion.
  • Understanding their structure and interaction is vital for elucidating fusion mechanisms.

Purpose of the Study:

  • To visualize the three-dimensional structure of NSF and the SNARE complex using electron microscopy.
  • To investigate the conformational changes of NSF upon nucleotide binding.
  • To determine how NSF interacts with the SNARE complex and alpha-SNAP.

Main Methods:

  • Quick-freeze/deep-etch electron microscopy of recombinant proteins.
  • Utilizing epitope tags, antibodies, and maltose-binding protein markers.
  • Biochemical assays to study protein interactions and nucleotide dependence.

Main Results:

  • NSF is a hollow cylinder (10 x 16 nm) with nucleotide-dependent conformational changes.
  • The SNARE complex is a rod-like structure (4 x 14 nm) with aligned syntaxin and synaptobrevin.
  • NSF binds the SNARE complex and alpha-SNAP to form an asymmetric 20S complex.

Conclusions:

  • The study provides high-resolution structural insights into NSF and the SNARE complex.
  • Proposed mechanism for NSF-mediated SNARE complex disassembly.
  • Structural understanding advances knowledge of the molecular machinery of membrane fusion.