Functional depletion of mahogunin by cytosolically exposed prion protein contributes to neurodegeneration.

Functional depletion of mahogunin by cytosolically exposed prion protein contributes to neurodegeneration.
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DOI:
10.1016/j.cell.2009.03.042
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发表时间:
2009-06-12
期刊:
影响因子:
64.5
通讯作者:
Hegde RS
Hegde RS
中科院分区:
生物学1区
文献类型:
--
作者:
Chakrabarti O;Hegde RS

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The pathways leading from aberrant Prion protein (PrP) metabolism to neurodegeneration are poorly understood. Some familial PrP mutants generate increased CtmPrP, a transmembrane isoform associated with disease. In other disease situations, a potentially toxic cytosolic form (termed cyPrP) might be produced. However, the mechanisms by which CtmPrP or cyPrP cause selective neuronal dysfunction are unknown. Here, we show that both CtmPrP and cyPrP can interact with and disrupt the function of Mahogunin (Mgrn), a cytosolic ubiquitin ligase whose loss causes spongiform neurodegeneration. Cultured cells and transgenic mice expressing either CtmPrP-producing mutants or cyPrP partially phenocopy Mgrn depletion, displaying aberrant lysosomal morphology and loss of Mgrn in selected brain regions. These effects were rescued by either Mgrn overexpression, competition for PrP binding sites, or preventing cytosolic exposure of PrP. Thus, transient or partial exposure of PrP to the cytosol leads to inappropriate Mgrn sequestration that contributes to neuronal dysfunction and disease.
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