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- W2991366148 abstract "Lafora progressive myoclonus epilepsy is a fatal rare neurodegenerative disorder characterized by the accumulation of insoluble abnormal glycogen deposits in the brain and peripheral tissues. Mutations in at least two genes are responsible for the disease: EPM2A , encoding the glucan phosphatase laforin, and EPM2B , encoding the RING-type E3-ubiquitin ligase malin. Both laforin and malin form a functional complex in which laforin recruits the substrates to be ubiquitinated by malin. We and others have described that, in cellular and animal models of this disease, there is an autophagy impairment which leads to the accumulation of dysfunctional mitochondria. In addition, we established that the autophagic defect occurred at the initial steps of autophagosome formation. In this work, we present evidence that in cellular models of the disease there is a decrease in the amount of phosphatidylinositol-3P. This is probably due to defective regulation of the autophagic PI3KC3 complex, in the absence of a functional laforin/malin complex. In fact, we demonstrate that the laforin/malin complex interacts physically and co-localizes intracellularly with core components of the PI3KC3 complex (Beclin1, Vps34 and Vps15), and that this interaction is specific and results in the polyubiquitination of these proteins. In addition, the laforin/malin complex is also able to polyubiquitinate ATG14L and UVRAG. Finally, we show that overexpression of the laforin/malin complex increases PI3KC3 activity. All these results suggest a new role of the laforin/malin complex in the activation of autophagy via regulation of the PI3KC3 complex and explain the defect in autophagy described in Lafora disease. • Lafora disease cell models produce lower levels of PI3P. • The laforin/malin E3 ligase interacts and ubiquitinates Beclin1. • The laforin/malin complex interacts with additional components of the PI3KC3 complex. • Ubiquitination of the PI3KC3 complex by laforin and malin increases its activity." @default.
- W2991366148 created "2019-12-05" @default.
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- W2991366148 date "2020-02-01" @default.
- W2991366148 modified "2023-09-23" @default.
- W2991366148 title "Regulation of the autophagic PI3KC3 complex by laforin/malin E3-ubiquitin ligase, two proteins involved in Lafora disease" @default.
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- W2991366148 doi "https://doi.org/10.1016/j.bbamcr.2019.118613" @default.
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