Development of a novel yeast cell-based system for studying the aggregation of Alzheimer's disease-associated Abeta peptides in vivo.
Alzheimer's disease is the most common neurodegenerative disease, affecting approximately 50% of humans by age 85. The disease process is associated with aggregation of the Abeta peptides, short 39-43 residue peptides generated through endoproteolytic cleavage of the Alzheimer's precursor protein. While the process of aggregation of purified Abeta peptides in vitro is beginning to be well understood, little is known about this process in vivo. In the present study, we use the yeast Saccharomyces cerevisiae as a model system for studying Abeta-mediated aggregation in an organism in vivo. One of this yeast's endogenous prions, Sup35/[PSI+], loses the ability to aggregate when the prion-forming domain of this protein is deleted. We show that insertion of Abeta peptide sequences in place of the original prion domain of this protein restores its ability to aggregate. However, the aggregates are qualitatively different from [PSI+] prions in their sensitivity to detergents and in their requirements on trans-acting factors that are normally needed for [PSI+] propagation. We conclude that we have established a useful new tool for studying the aggregation of Abeta peptides in an organism in vivo.
von der Haar
Tobias
T
Protein Science Group, Department of Biosciences, University of Kent, Canterbury, UK.
Jossé
Lyne
L
Wright
Paul
P
Zenthon
Jo
J
Tuite
Mick F
MF
D016229:Amyloid beta-Peptides / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D010454:Peptide Termination Factors; D010455:Peptides / Q000235:genetics / Q000378:metabolism; D011328:Prions; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*
D016229:Amyloid beta-Peptides; D010454:Peptide Termination Factors; D010455:Peptides; D011328:Prions; C068068:SUP35 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins