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• W2146511440 abstract "The voltage-gated sodium channel β2 subunit (Navβ2) is a physiological substrate of BACE1 (β-site APP cleaving enzyme) and γ-secretase, two proteolytic enzymes central to Alzheimer's disease pathogenesis. Previously, we have found that the processing of Navβ2 by BACE1 and γ-secretase regulates sodium channel metabolism in neuronal cells. In the current study we identified the BACE1 cleavage sites in human Navβ2.We found a major (147-148 L↓M, where ↓ indicates the cleavage site) and a minor (144145 L↓Q) BACE1 cleavage site in the extracellular domain of human Navβ2 using a cell-free BACE1 cleavage assay followed by mass spectrometry. Next, we introduced two different double mutations into the identified major BACE1 cleavage site in human Navβ2: 147LM/VI and 147LM/AA. Both mutations dramatically decreased the cleavage of human Navβ2 by endogenous BACE1 in cell-free BACE1 cleavage assays. Neither of the two mutations affected subcellular localization of Navβ2 as confirmed by confocal fluorescence microscopy and subcellular fractionation of cholesterol-rich domains. Finally, wildtype and mutated Navβ2 were expressed along BACE1 in B104 rat neuroblastoma cells. In spite of α-secretase still actively cleaving the mutant proteins, Navβ2 cleavage products decreased by ~50% in cells expressing Navβ2 (147LM/VI) and ~75% in cells expressing Navβ2 (147LM/AA) as compared to cells expressing wildtype Navβ2.We identified a major (147-148 L↓M) and a minor (144-145 L↓Q) BACE1 cleavage site in human Navβ2. Our in vitro and cell-based results clearly show that the 147-148 L↓M is the major BACE1 cleavage site in human Navβ2. These findings expand our understanding of the role of BACE1 in voltage-gated sodium channel metabolism." @default.
• W2146511440 created "2016-06-24" @default.
• W2146511440 creator A5020918785 @default.
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• W2146511440 date "2010-12-01" @default.
• W2146511440 modified "2023-09-27" @default.
• W2146511440 title "Identification of BACE1 cleavage sites in human voltage-gated sodium channel beta 2 subunit" @default.
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• W2146511440 doi "https://doi.org/10.1186/1750-1326-5-61" @default.
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