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Human Polycomb protein 2 promotes α-synuclein aggregate formation through covalent SUMOylation.

Brain Res.2011 Mar 24;1381:78-89. Epub 2011 Jan 20
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摘要


Parkinson's disease (PD) manifests from the impairment of motor systems due to the specific loss of dopaminergic neurons and the appearance of intracellular filamentous inclusions called Lewy bodies (LBs). α-Synuclein, a major component of LBs, is known to contribute to the pathogenesis of PD. Although α-synuclein is known to be a target of diverse posttranslational modifications, the contribution of α-synuclein SUMOylation and its functional consequences have not yet been fully characterized. Here, we demonstrate that human Polycomb protein 2 (hPc2) binds to α-synuclein and may function as a SUMO E3 ligase to promote the SUMOylation of α-synuclein. In addition, hPc2 promotes the SUMOylation of α-synuclein in the presence of MG-132-induced proteasome inhibition, which consequently promotes α-synuclein aggregate formation. Furthermore, the increased formation of intracellular α-synuclein aggregates, which predominantly contain SUMOylated α-synuclein, significantly reduces the death of fibroblast cells in response to staurosporine. In summary, the results from this study demonstrate that the hPc2-induced SUMOylation of α-synuclein could function as a cytoprotector by increasing α-synuclein aggregate formation within fibroblast cells.

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