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Related Experiment Video

Updated: Jul 13, 2025

Generation of Native, Untagged Huntingtin Exon1 Monomer and Fibrils Using a SUMO Fusion Strategy
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Interaction between huntingtin exon 1 and HEAT repeat structure probed by chimeric model proteins.

Hong Zhang1,2,3, Si Wu1,2, Laura S Itzhaki4

  • 1National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.

Protein Science : a Publication of the Protein Society
|October 19, 2023
PubMed
Summary

Huntington disease (HD) involves huntingtin (HTT) protein aggregation. This study explored HTT exon 1 interactions with its HEAT repeat structure, revealing insights into HD pathogenesis.

Keywords:
HEAT repeatamyloidhuntingtin exon 1polyQprotein folding

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Protein Biochemistry

Background:

  • Huntington disease (HD) is linked to aggregated huntingtin (HTT) protein with expanded polyglutamine (polyQ) repeats in exon 1.
  • The large size of HTT hinders structural studies, leading to focus on the exon 1 region.
  • The HTT C-terminus contains HEAT repeats crucial for cellular functions.

Purpose of the Study:

  • To investigate the interaction between the HTT exon 1 region and its HEAT repeat structure.
  • To understand how this interaction influences protein stability, flexibility, and fibril formation in the context of HD.

Main Methods:

  • Construction of chimeric proteins combining HTT exon 1 and the HEAT repeat protein PR65/A.
  • Analysis of the impact of HTT exon 1 on HEAT repeat structure and flexibility.
  • Assessment of amyloid fibril formation in chimeric proteins with varying polyQ lengths.

Main Results:

  • HTT exon 1 slightly destabilizes and increases the conformational flexibility of the downstream HEAT repeat structure.
  • PolyQ length (wild-type vs. pathological) did not alter the interaction between HTT exon 1 and HEAT repeats.
  • C-terminal fusion of HEAT repeats modulated the fibril architecture and formation kinetics of pathological HTT exon 1.

Conclusions:

  • The interaction between HTT exon 1 and HEAT repeats is compatible with both normal HTT function and HD pathogenesis.
  • This study offers a model for further research into HTT structure-function relationships and HD mechanisms.