TY - JOUR
T1 - CHIP targets toxic α-synuclein oligomers for degradation
AU - Tetzlaff, Julie E.
AU - Putcha, Preeti
AU - Outeiro, Tiago F.
AU - Ivanov, Alexander
AU - Berezovska, Oksana
AU - Hyman, Bradley T.
AU - McLean, Pamela J.
PY - 2008/6/27
Y1 - 2008/6/27
N2 - α-Synuclein (αSyn) can self-associate, forming oligomers, fibrils, and Lewy bodies, the pathological hallmark of Parkinson disease. Current dogma suggests that oligomeric αSyn intermediates may represent the most toxic αSyn species. Here, we studied the effect of a potent molecular chaperone, CHIP (carboxyl terminus of Hsp70-interacting protein), on αSyn oligomerization using a novel bimolecular fluorescence complementation assay. CHIP is a multidomain chaperone, utilizing both a tetratricopeptide/Hsp70 binding domain and a U-box/ubiquitin ligase domain to differentially impact the fate of misfolded proteins. In the current study, we found that co-expression of CHIP selectively reduced αSyn oligomerization and toxicity in a tetratricopeptide domain-dependent, U-box-independent manner by specifically degrading toxic αSyn oligomers. We conclude that CHIP preferentially recognizes and mediates degradation of toxic, oligomeric forms of αSyn. Further elucidation of the mechanisms of CHIP-induced degradation of oligomeric αSyn may contribute to the successful development of drug therapies that target oligomeric αSyn by mimicking or enhancing the powerful effects of CHIP.
AB - α-Synuclein (αSyn) can self-associate, forming oligomers, fibrils, and Lewy bodies, the pathological hallmark of Parkinson disease. Current dogma suggests that oligomeric αSyn intermediates may represent the most toxic αSyn species. Here, we studied the effect of a potent molecular chaperone, CHIP (carboxyl terminus of Hsp70-interacting protein), on αSyn oligomerization using a novel bimolecular fluorescence complementation assay. CHIP is a multidomain chaperone, utilizing both a tetratricopeptide/Hsp70 binding domain and a U-box/ubiquitin ligase domain to differentially impact the fate of misfolded proteins. In the current study, we found that co-expression of CHIP selectively reduced αSyn oligomerization and toxicity in a tetratricopeptide domain-dependent, U-box-independent manner by specifically degrading toxic αSyn oligomers. We conclude that CHIP preferentially recognizes and mediates degradation of toxic, oligomeric forms of αSyn. Further elucidation of the mechanisms of CHIP-induced degradation of oligomeric αSyn may contribute to the successful development of drug therapies that target oligomeric αSyn by mimicking or enhancing the powerful effects of CHIP.
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U2 - 10.1074/jbc.M802283200
DO - 10.1074/jbc.M802283200
M3 - Article
C2 - 18436529
AN - SCOPUS:49649125680
SN - 0021-9258
VL - 283
SP - 17962
EP - 17968
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 26
ER -