BACE1 (β-Secretase) is a membrane-anchored aspartic protease existing in acidic subcellular vesicles. It is a key player in producing β-amyloid peptides through proteolytic cleavage of the β-amyloid precursor protein (APP). Accumulation of neurotoxic β-amyloid peptide is seen in senile plaques in the brains of patients with Alzheimer’s disease (AD), an age-related cognitive disorder. Therefore, targeting β-secretase is considered a potential therapeutic strategy for the prevention and treatment of AD. The SensoLyte® 520 BACE1 (β-Secretase) Assay Kit is a homogeneous assay that can be used to detect the activity of enzyme and for screening of secretase inhibitors. It contains a QXL® 520/ HiLyte™ Fluor 488 FRET substrate. The sequence of this FRET peptide is derived from the β-secretase cleavage site on the Swedish APP mutation. This mutation causes the enhancement of β-secretase to process APP, resulting in an early onset of AD. Active β-secretase cleaves FRET substrate into two separate fragments resulting in the release of HiLyte™ Fluor 488 fluorescence that can be monitored at excitation/emission= 490/520 nm. The long wavelength fluorescence of HiLyte™ Fluor 488 is less interfered by the autofluorescence of components in biological samples and test compounds. Kit Size: 100 assays (96-well plate)

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