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IRTG / Soft Matter Science
Freiburger Materialforschungszentrum
Stefan-Meier-Str. 21
79104 Freiburg, Germany

Contact: Jana Husse

+49 761 203 678 34
softmattergraduate[at]uni-freiburg.de


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You are here: Home Events Professor Regina Murphy "Protein Misfolding and Aggregation in Neurodegenerative Diseases"

Professor Regina Murphy "Protein Misfolding and Aggregation in Neurodegenerative Diseases"

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Chemical and Biological Engineering, University of Wisconsin Madison

What
  • Seminar
When Mar 29, 2011
from 02:15 PM to 03:00 PM
Where “Hörsaal Makromolekulare Chemie”, Stefan-Meier-Str. 31, Freiburg
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Abstract

Misfolding and aggregation of peptides and proteins has been linked to toxicity in Alzheimer’s, Huntington’s, and other neurodegenerative diseases. Biochemical and biophysical methods can be used to probe key questions about the mechanisms by which proteins misfold and aggregate. Two systems will be discussed.(1) Huntington’s disease (HD) is caused by expansion of the CAG domain in huntingtin, leading to inordinately long polyglutamine stretches in the huntingtin protein. Polyglutamine peptides have been used as model systems to investigate the length‐dependence of aggregation. We have examined polyglutamine peptide aggregation and propose a mechanism of aggregation that differs from the widely‐held ‘monomeric nucleus’ hypothesis. We have extended our studies to examine polyglutamine‐containing proteins, and demonstrate the critical importance of the position within the host protein in regulating the effect of polyglutamine on misfolding, stability and aggregation.(2) In Alzheimer’s disease, aggregation of β‐amyloid peptide (Aβ), and its subsequent deposition as fibrils, is believed to be the underlying cause of neurotoxicity. We have carried out extensive investigations into Aβaggregation kinetics. In our current studies, we are pursuing the hypothesis that a naturally occurring omotetrameric protein, transthyretin, may be protective against Aβtoxicity, and we are orking to identify the specific residues in TTR that are involved with binding to Aβ.

 

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