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Related Experiment Video

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Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain

Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain

Published on: August 28, 2012

Reversible aggregation of PABPN1 pre-inclusion structures.

Vered Raz¹, Tsion Abraham, Erik W van Zwet

¹Department of Human Genetics, Leiden University Medical Centre, The Netherlands. v.raz@lumc.nl

Nucleus (Austin, Tex.)

|August 6, 2011

Summary

Misfolded protein aggregation, common in aging and neurodegenerative diseases, differs in its early stages for oculopharyngeal muscular dystrophy (OPMD). Pre-aggregated protein species, not final inclusions, may be the toxic culprits.

Keywords:

PABPN1 nuclear structures protein aggregation protein dynamic protein mobility

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Last Updated: May 30, 2026

Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain

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Published on: August 28, 2012

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Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography

Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography

Published on: March 9, 2010

Area of Science:

Molecular Biology
Cell Biology
Neuroscience

Background:

Protein misfolding and aggregation are hallmarks of aging and neurodegenerative diseases.
Oculopharyngeal muscular dystrophy (OPMD) is linked to expanded polyalanine PABPN1 protein aggregation.
Wild-type PABPN1 aggregation is not typically associated with disease.

Purpose of the Study:

To investigate the dynamic process of PABPN1 protein aggregation in living cells.
To differentiate the aggregation pathways of wild-type (WT) PABPN1 and alanine-expanded (expPABPN1) PABPN1.
To identify potential cytotoxic species preceding inclusion body formation.

Main Methods:

Microscopic image quantification in living cells.
Analysis of PABPN1 aggregation dynamics (WT vs. expPABPN1).
Assessment of PABPN1-specific affinity binder effects on different aggregation states.

Main Results:

Transitional pre-inclusion foci differ significantly between WT- and expPABPN1-expressing cells.
Insoluble inclusions of WT- and expPABPN1 were morphologically indistinguishable.
expPABPN1 cells showed immobile, pre-aggregated species in the nucleoplasm.
Pre-aggregated and pre-inclusion structures were reversible with a PABPN1 binder, unlike mature inclusions.

Conclusions:

The PABPN1 aggregation process diverges before inclusion formation for WT and expPABPN1.
Pre-aggregated protein species, rather than final inclusions, are suggested as the cytotoxic entities in OPMD.
Targeting early aggregation intermediates may offer therapeutic potential for PABPN1-related disorders.