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Measuring Transcellular Interactions through Protein Aggregation in a Heterologous Cell System
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Functional interactions as a survival strategy against abnormal aggregation.

Laura Masino1, Giuseppe Nicastro, Lesley Calder

  • 1MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|September 3, 2010
PubMed
Summary
This summary is machine-generated.

Protein Josephin domain can fibrillize, but its natural substrate binding prevents this aggregation. This discovery reveals how protein function protects against disease-related protein misfolding.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Neuroscience

Background:

  • Protein aggregation is implicated in various human diseases.
  • Native protein states are generally protected against aggregation, but mechanisms remain unclear.
  • Ataxin-3, linked to Spinocerebellar ataxia type 3, aggregates under native conditions, modulated by its Josephin domain.

Purpose of the Study:

  • Identify regions promoting Josephin fibrillogenesis.
  • Understand protective mechanisms against aberrant aggregation in ataxin-3.
  • Investigate the role of protein function in preventing aggregation.

Main Methods:

  • Biophysical techniques
  • Aggregation propensity predictions
  • Rational design of amino acid substitutions

Main Results:

  • The Josephin domain intrinsically tends to fibrillize under native conditions.
  • Two solvent-exposed patches promote Josephin fibrillization.
  • Mutations in these patches or substrate binding reduce aggregation kinetics.

Conclusions:

  • Protein function, specifically substrate binding, actively prevents aberrant fibrillization.
  • Identified molecular mechanisms explain how ataxin-3 avoids pathological aggregation.
  • Findings offer insights into neurodegenerative disease prevention.