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Impaired degradation of mutant alpha-synuclein by chaperone-mediated autophagy.

Authors:
Cuervo AM, Stefanis L, Fredenburg R, Lansbury PT, Sulzer D
Affiliation:
Journal:
Science (New York, N.Y.)

Abstract

Aberrant alpha-synuclein degradation is implicated in Parkinson's disease pathogenesis because the protein accumulates in the Lewy inclusion bodies associated with the disease. Little is known, however, about the pathways by which wild-type alpha-synuclein is normally degraded. We found that wild-type alpha-synuclein was selectively translocated into lysosomes for degradation by the chaperone-mediated autophagy pathway. The pathogenic A53T and A30P alpha-synuclein mutants bound to the receptor for this pathway on the lysosomal membrane, but appeared to act as uptake blockers, inhibiting both their own degradation and that of other substrates. These findings may underlie the toxic gain-of-function by the mutants.

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