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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Amyloid-β Increases Activity of Proteasomes Capped with 19S and 11S Regulators.
Journal of Alzheimer's Disease : JAD 2016 September 7
Accumulation of amyloid-β (Aβ) in neurons accompanies Alzheimer's disease progression. In the cytoplasm Aβ influences activity of proteasomes, the multisubunit protein complexes that hydrolyze the majority of intracellular proteins. However, the manner in which Aβ affects the proteolytic activity of proteasomes has not been established. In this study the effect of Aβ42 and Aβ42 with isomerized Asp7 on activity of different forms of proteasomes has been analyzed. It has been shown that Aβ peptides efficiently reduce activity of the 20S proteasomes, but increase activity of the 20S proteasomes capped with the 19S and/or 11S regulators. Modulation of proteasome activity is mainly determined by the C-terminal segment of Aβ (amino acids 17-42). This study demonstrated an important role of proteasome regulators in the interplay between Aβ and the proteasomes.
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