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• W2109736077 abstract "Abstract: No single protease has emerged that possesses all the expected properties for β-secretase, including brain localization, appropriate peptide cleavage specificity, and the ability to cleave amyloid precursor protein exactly at the amino-terminus of β-amyloid peptide. We have isolated and purified a brain-derived activity that cleaves the synthetic peptide substrate SEVKMDAEF between methionine and aspartate residues, as required to generate the amino-terminus of β-amyloid peptide. Its molecular size of 55–60 kDa and inhibitory profile indicate that we have purified the metalloprotease EC 3.4.24.15. We have compared the sequence specificity of EC 3.4.24.15, cathepsin D, and cathepsin G for their ability to cleave the model peptide SEVKMDAEF or related peptides that contain substitutions reported to modulate β-amyloid peptide production. We have also tested the ability of these enzymes to form carboxy-terminal fragments from full-length, membrane-embedded amyloid precursor protein substrate or amyloid precursor protein that contains the Swedish KM → NL mutation. The correct cleavage was tested with an antibody specific for the free amino-terminus of β-amyloid peptide. Our results exclude EC 3.4.24.15 as a candidate β-secretase. Although cathepsin G cleaves the model peptide correctly, it displays poor ability to cleave the Swedish KM → NL peptide and does not generate carboxy-terminal fragments that are immunoreactive with amino-terminal-specific antiserum. Cathepsin D does not cleave the model peptide or show specificity for wild-type amyloid precursor protein; however, it cleaves the Swedish “NL peptide” and “NL precursor” substrates appropriately. Our results suggest that cathepsin D could act as β-secretase in the Swedish type of familial Alzheimer's disease and demonstrate the importance of using full-length substrate to verify the sequence specificity of candidate proteases." @default.
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• W2109736077 date "2002-11-23" @default.
• W2109736077 modified "2023-10-17" @default.
• W2109736077 title "Evaluation of Cathepsins D and G and EC 3.4.24.15 as Candidate β-Secretase Proteases Using Peptide and Amyloid Precursor Protein Substrates" @default.
• W2109736077 doi "https://doi.org/10.1046/j.1471-4159.1996.66062436.x" @default.
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