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Updated: Jul 9, 2025
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Preparation of Graphene-Supported Microwell Liquid Cells for In Situ Transmission Electron Microscopy
Published on: July 15, 2019
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Single-Molecule Graphene Liquid Cell Electron Microscopy for Instability of Intermediate Amyloid Fibrils
Jungjae Park1, Hyeongseop Jeong2, Namgyu Noh1
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
Advanced Materials (Deerfield Beach, Fla.)
|November 28, 2023
Summary
Graphene liquid-cell transmission electron microscopy (GLC-TEM) allows real-time observation of amyloid fibril structure. This technique overcomes limitations of other methods, revealing early structural changes that drive amyloid polymorph formation.
Area of Science:
- Biophysics
- Materials Science
- Microscopy
Background:
- Single-molecule techniques offer high-resolution biological insights.
- Optical methods face spatiotemporal resolution limits.
- Existing liquid-phase transmission electron microscopy (LP-TEM) struggles with molecular damage and species identification.
Purpose of the Study:
- Introduce a novel graphene liquid-cell TEM (GLC-TEM) technique.
- Investigate real-time structural perturbations in intact amyloid fibrils.
- Overcome limitations of current single-molecule LP-TEM methods.
Main Methods:
- Developed a single-molecule graphene liquid-cell TEM (GLC-TEM) system.
- Utilized graphene membranes to protect native amyloid beta proteins from electron-beam damage.
- Performed stochastic and time-resolved imaging of single amyloid fibrils.
Main Results:
- Graphene membranes significantly extended observation times for amyloid fibrils.
- The GLC-TEM technique prevented electron-beam-induced oxidative damage.
- Early-stage structural perturbations were identified as key drivers of amyloid polymorph formation.
Conclusions:
- GLC-TEM provides unprecedented real-time resolution for observing structural dynamics.
- This technique offers a valuable complementary approach to existing single-molecule methods.
- GLC-TEM enables detailed studies of amyloid fibril structural evolution.
