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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

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Published on: November 21, 2013

Ab Initio Determination of Peptide Structures by MicroED.

Chih-Te Zee¹, Ambarneil Saha¹, Michael R Sawaya²

¹Department of Chemistry and Biochemistry, UCLA-DOE Institute for Genomics and Proteomics, STROBE, NSF Science and Technology Center, University of California, Los Angeles (UCLA), Los Angeles, CA, USA.

Methods in Molecular Biology (Clifton, N.J.)

|December 28, 2020

Summary

Electron micro-diffraction (MicroED) advances crystallographic methods for determining peptide structures. This technique analyzes nano-scale peptide assemblies to reveal structures of amyloid-forming peptides.

Keywords:

Ab initio Amyloid Direct methods Nanocrystal Peptide

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Area of Science:

Structural biology
Biophysics
Materials science

Background:

Advances in crystallographic methods enhance small macromolecule structural elucidation.
Electron micro-diffraction (MicroED) is a key technology for analyzing nano-scale crystalline assemblies.

Purpose of the Study:

To describe the process of ab initio structural determination.
To highlight the application of MicroED for analyzing peptide assemblies.

Main Methods:

Utilizing electron micro-diffraction (MicroED) on protein nanocrystals.
Collecting atomic or near-atomic resolution data under cryogenic conditions.
Applying these methods to nano-scale peptide assemblies.

Main Results:

Enabled ab initio structure determination of various amyloid-forming peptides.
Successfully analyzed peptide segments from prions and ice-nucleating proteins.
Demonstrated the capability to interrogate crystalline peptide assemblies hundreds of nanometers thick.

Conclusions:

MicroED facilitates structural elucidation of small macromolecules like peptides.
Ab initio structure determination is now feasible for nano-scale peptide assemblies.
This technology opens new avenues for studying amyloid structures and related proteins.