Applying Hsp104 to protein-misfolding disorders.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
Shilpa VashistJames Shorter

Abstract

Hsp104, a hexameric AAA+ ATPase found in yeast, transduces energy from cycles of ATP binding and hydrolysis to resolve disordered protein aggregates and cross-beta amyloid conformers. These disaggregation activities are often co-ordinated by the Hsp70 chaperone system and confer considerable selective advantages. First, renaturation of aggregated conformers by Hsp104 is critical for yeast survival after various environmental stresses. Second, amyloid remodeling by Hsp104 enables yeast to exploit multifarious prions as a reservoir of beneficial and heritable phenotypic variation. Curiously, although highly conserved in plants, fungi and bacteria, Hsp104 orthologues are absent from metazoa. Indeed, metazoan proteostasis seems devoid of a system that couples protein disaggregation to renaturation. Here, we review recent endeavors to enhance metazoan proteostasis by applying Hsp104 to the specific protein-misfolding events that underpin two deadly neurodegenerative amyloidoses. Hsp104 potently inhibits Abeta42 amyloidogenesis, which is connected with Alzheimer's disease, but appears unable to disaggregate preformed Abeta42 fibers. By contrast, Hsp104 inhibits and reverses the formation of alpha-synuclein oligomers and fibers, which...Continue Reading

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