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Glu11 Site Cleavage and N-Terminally Truncated Aβ Production upon BACE Overexpression

Liu, Kangning, Doms, Robert W., Lee, Virginia M.-Y.·2002·Biochemistry

Abstract

Amyloid beta peptides (A beta) are generated by the proteolytic processing of the amyloid beta precursor protein (APP). The newly identified beta-site APP-cleaving enzyme (BACE) cleaves APP at Asp1 as well as between Tyr10 and Glu11 of A beta, producing C-terminal fragments (CTFs) C99 and C89, respectively. Subsequent cleavage by gamma-secretase gives rise to A beta 1-40/42 and A beta 11-40/42. Although both full-length and A beta peptides truncated at residue 11 have been identified in amyloid plaques in the AD brain, the relative proportion of these two cleavage products produced by BACE and secreted into the medium by cultured cells is unknown. Using cell lines stably overexpressing BACE, we found that A beta 11-40 and A beta 11-42 are major A beta cleavage products generated by BACE. We further showed that BACE utilizes both full-length APP as well as C99 as substrates for the production of C89, and that A beta 11-40/42 can be generated by sequential cleavage of single APP molecules by BACE and gamma-secretase. Taken together, the abundance of A beta 11-40/42 produced by BACE suggests that their roles in AD pathogenesis may be underestimated.

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Crossref · 10.1021/bi015800g

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Metadata

Authors
Liu, K., Doms, R. W., & Lee, V. M.-Y.
Affiliations
The Center for Neurodegenerative Disease Research, Department of Pathology and Laboratory Medicine, and Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
Venue
Biochemistry
Published
2002-02-08
Volume
41
Issue
9
Pages
3128-3136
ISSN
  • 0006-2960
  • 1520-4995
Cited by
96
References
1
Language
en

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