A kinetic assessment of theC. elegansamyloid disaggregation activity enables uncoupling of disassembly and proteolysis
Open Access
- 21 August 2009
- journal article
- research article
- Published by Wiley in Protein Science
- Vol. 18 (11), 2231-2241
- https://doi.org/10.1002/pro.234
Abstract
Protein aggregation is a common feature of late onset neurodegenerative disorders, including Alzheimer's disease. In Alzheimer's disease, misassembly of the Aβ peptide is genetically linked to proteotoxicity associated with disease etiology. A reduction in Aβ proteotoxicity is accomplished, in part, by the previously reported Aβ disaggregation and proteolysis activities–under partial control of heat shock factor 1, a transcription factor regulating proteostasis in the cytosol and negatively regulated by insulin growth factor signaling. Herein, we report an improved in vitro assay to quantify recombinant fibrillar Aβ disaggregation kinetics accomplished by the exogenous application of C.elegans extracts. With this assay we demonstrate that the Aβ disaggregation and proteolysis activities of C.elegans are separable. The disaggregation activity found in C.elegans preparations is more heat resistant than the proteolytic activity. Aβ disaggregation in the absence of proteolysis was found to be a reversible process. Future discovery of the molecular basis of the disaggregation and proteolysis activities offers the promise of delaying the age‐onset proteotoxicity that leads to neurodegeneration in a spectrum of maladies.Keywords
This publication has 36 references indexed in Scilit:
- FOXO3A genotype is strongly associated with human longevityProceedings of the National Academy of Sciences, 2008
- The insulin paradox: aging, proteotoxicity and neurodegenerationNature Reviews Neuroscience, 2008
- Functionally significant insulin-like growth factor I receptor mutations in centenariansProceedings of the National Academy of Sciences, 2008
- Destruction or Potentiation of Different Prions Catalyzed by Similar Hsp104 Remodeling ActivitiesMolecular Cell, 2006
- The Kinetics of Nucleated Polymerizations at High Concentrations: Amyloid Fibril Formation Near and Above the “Supercritical Concentration”Biophysical Journal, 2006
- The Plasticity of Aging: Insights from Long-Lived MutantsCell, 2005
- Cell biology of protein misfolding: The examples of Alzheimer's and Parkinson's diseasesNature, 2004
- Regulation of Longevity inCaenorhabditis elegansby Heat Shock Factor and Molecular ChaperonesMolecular Biology of the Cell, 2004
- Protein folding and misfoldingNature, 2003
- Aging as a major risk for degenerative diseases of the central nervous systemCurrent Opinion in Neurology, 1994