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• W1604272660 abstract "The amyloid beta-protein (A beta) that is progressively deposited in Alzheimer's disease (AD) arises from proteolysis of the integral membrane protein, beta-amyloid precursor protein (beta APP). Although A beta formation appears to play a seminal role in AD, only a few studies have examined the chemical structure of A beta purified from brain, and there are discrepancies among the findings. We describe a new method for the rapid extraction and purification of A beta that minimizes artifactual proteolysis. A beta purified by two-dimensional reverse-phase HPLC was analyzed by combined amino acid sequencing and mass spectrometry after digestion with a lysylendopeptidase. The major A beta peptide in the cerebral cortex of all five AD brains examined was aspartic acid 1 to valine 40. A minor species beginning at glutamic acid 3 but blocked by conversion to pyroglutamate was also found in all cases. A species ending at threonine 43 was detected, varying from approximately 5 to 25% of total A beta COOH-terminal fragments. Peptides ending with valine 39, isoleucine 41, or alanine 42 were not detected, except for one brain with a minor peptide ending at valine 39. Our findings suggest that A beta 1-40 is the major species of beta-protein in AD cerebral cortex. A beta 1-40 and A beta 1-43 peptides could arise independently from beta APP, or A beta 1-43 could be the initial excised fragment, followed by digestion to yield A beta 1-40. These analyses of native A beta in AD brain recommend the use of synthetic A beta 1-40 peptide to model amyloid fibrillogenesis and toxicity in vitro." @default.
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• W1604272660 date "1992-10-01" @default.
• W1604272660 modified "2023-10-07" @default.
• W1604272660 title "Mass spectrometry of purified amyloid beta protein in Alzheimer's disease." @default.
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• W1604272660 doi "https://doi.org/10.1016/s0021-9258(18)41896-0" @default.
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