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Related Experiment Video

Updated: Jul 11, 2025

Monitoring Protein Aggregation Kinetics In Vivo using Automated Inclusion Counting in Caenorhabditis elegans

Monitoring Protein Aggregation Kinetics In Vivo using Automated Inclusion Counting in Caenorhabditis elegans

Published on: December 17, 2021

Pathologic polyglutamine aggregation begins with a self-poisoning polymer crystal.

Tej Kandola^1,2, Shriram Venkatesan¹, Jiahui Zhang³

¹Stowers Institute for Medical Research, Kansas City, United States.

|November 3, 2023

Summary

Polyglutamine (polyQ) amyloid formation in neurodegenerative diseases is initiated by a specific three-glutamine pattern. This pattern forms a self-poisoning steric zipper, which can be blocked to prevent aggregation.

Keywords:

Huntington's disease S. cerevisiae aging amyloid molecular biophysics phase separation polyglutamine structural biology

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Last Updated: Jul 11, 2025

Monitoring Protein Aggregation Kinetics In Vivo using Automated Inclusion Counting in Caenorhabditis elegans

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Published on: December 17, 2021

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Published on: June 27, 2018

Assays for the Degradation of Misfolded Proteins in Cells

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Published on: August 28, 2016

Area of Science:

Biochemistry
Structural Biology
Neuroscience

Background:

Amyloid research aims to understand the nucleation event.
The transient nature of nucleation hinders characterization.
Polyglutamine (polyQ) expansion causes neurodegenerative diseases.

Purpose of the Study:

Characterize the structural basis of polyQ amyloid nucleation.
Identify key features of the polyQ amyloid nucleus.
Explore therapeutic strategies targeting polyQ aggregation.

Main Methods:

Intracellular reporter of self-association to quantify amyloid formation.
Analysis of polyQ concentration, conformational templates, and sequence permutations.
Molecular simulations to determine structural features.
Genetic oligomerization to block amyloid formation.

Main Results:

PolyQ nucleation involves segments of three glutamine residues at alternating positions.
This pattern forms a four-stranded steric zipper with interdigitated glutamine side chains.
The zipper self-poisons its own growth by engaging naive polypeptides.
Genetic oligomerization prior to nucleation effectively blocks amyloid formation.

Conclusions:

Elucidated the physical nature of the rate-limiting polyQ aggregation event in cells.
Identified a specific structural motif responsible for polyQ amyloid nucleation.
Demonstrated a potential therapeutic strategy by exploiting self-poisoning to inhibit amyloid formation.
Provided molecular insights into the etiology of polyglutamine diseases.