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Epilepsy progressive myoclonus type 2 Lafora disease (laforin)
Epilepsy progressive myoclonus type 2A Lafora disease (laforin)
機能Dual specificity protein phosphatase. May be involved in the control of glycogen metabolism, particularly in monitoring for and preventing the formation of poorly branched glycogen molecules (polyglucosans). Acts as a scaffold protein to facilitate PPP1R3C/PTG ubiquitination by NHLRC1/malin. Forms a complex with NHLRC1/malin and HSP70 and this complex suppresses the cellular toxicity of misfolded proteins by promoting their degradation through the ubiquitin-proteasome system (UPS). Isoform 2, an inactive phosphatase, could function as a dominant-negative regulator for the phosphatase activity of isoform 1.
組織特異性Expressed in heart, skeletal muscle, kidney, pancreas and brain. Isoform 4 is also expressed in the placenta.
関連疾患Defects in EPM2A are a cause of progressive myoclonic epilepsy type 2 (EPM2) [MIM:254780]; also known as Lafora disease. EPM2 is an autosomal recessive and severe form of adolescent-onset progressive epilepsy. Typically, as seizures increase in frequency, cognitive function declines towards dementia, and affected individuals die usually within 10 years after onset. EPM2 occurs worldwide, but it is particularly common in the mediterranean countries of southern Europe and northern Africa, in southern India and in the Middle East. At the cellular level, it is characterized by accumulation of starch-like polyglucosans called Lafora bodies (LBs) that are most abundant in organs with the highest glucose metabolism: brain, heart, liver and skeletal muscle. Among other conditions involving polyglucosans, EPM2 is unique in that the inclusions are in neuronal dendrites but not axons and the forming polyglucosan fibrils are associated with the endoplasmic reticulum.
配列類似性Belongs to the protein-tyrosine phosphatase family. Contains 1 CBM20 (carbohydrate binding type-20) domain. Contains 1 tyrosine-protein phosphatase domain.
翻訳後修飾Polyubiquitinated by NHLRC1/malin. Phosphorylation on Ser-25 by AMPK affects the phosphatase activity of the enzyme and its ability to homodimerize and interact with NHLRC1, PPP1R3C or PRKAA2.
細胞内局在Cytoplasm; Cytoplasm. Nucleus; Endoplasmic reticulum. Cell membrane. Nucleus. Also found in the nucleus; Endoplasmic reticulum. Cell membrane. Primarily associated with polyribosomes at the endoplasmic reticulum, also found at the plasma membrane and Cytoplasm. Under glycogenolytic conditions localizes to the nucleus.