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Related Concept Videos

Amyloid Fibrils03:03

Amyloid Fibrils

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
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Updated: Sep 25, 2025

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Identifying Heterozipper β-Sheet in Twisted Amyloid Aggregation.

Yongxiu Song1,2,3, Bin Dai4, Yong Wang5

  • 1Institute for Advanced Materials, Jiangsu University, Zhenjiang, 212013, China.

Nano Letters
|April 25, 2022
PubMed
Summary

Amyloid peptide self-assembly into helical fibrils follows a hierarchical process. Researchers identified a novel heterozipper beta-sheet structure as the key building block for this ordered nanostructure formation.

Keywords:
atomic force microscopycryo-electron microscopy (cryo-EM)hierarchical nanostructurepeptide self-assemblytwisted nanofibrils

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Area of Science:

  • Biochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Amyloid peptide self-assembly is crucial for nanostructure formation.
  • Understanding the precise mechanisms of amyloid peptide (AP) hierarchical assembly remains a challenge.

Purpose of the Study:

  • To elucidate the molecular mechanisms driving AP self-assembly into well-ordered nanostructures.
  • To identify the fundamental building units and rules governing hierarchical fibril formation.

Main Methods:

  • Atomic Force Microscopy (AFM) for morphological analysis.
  • Cryo-Electron Microscopy (cryo-EM) for high-resolution structural determination.
  • Molecular Dynamics (MD) simulations for mechanistic insights.

Main Results:

  • AP self-assembly results in uniform, twisted fibrils with consistent morphology and periodicity.
  • A novel heterozipper beta-sheet structure was identified as a protofilament building block.
  • The arrangement of antiparallel beta strands within the heterozipper, driven by hydrophobic and hydrophilic interactions, dictates assembly.

Conclusions:

  • This study reveals the fundamental rule governing AP hierarchical assembly into helical fibrils.
  • The identified heterozipper beta-sheet structure is the basic unit driving the formation of ordered amyloid nanostructures.