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Splice variants of the beta-site APP-cleaving enzyme BACE1 in human brain and pancreas

MPG-Autoren
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Ehehalt,  R.
Max Planck Institute of Molecular Cell Biology and Genetics, Max Planck Society;

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Michel,  B.
Max Planck Institute of Molecular Cell Biology and Genetics, Max Planck Society;

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Simons,  K.
Max Planck Institute of Molecular Cell Biology and Genetics, Max Planck Society;

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Keller,  P.
Max Planck Institute of Molecular Cell Biology and Genetics, Max Planck Society;

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Zitation

Ehehalt, R., Michel, B., Tonelli, D., Zacchetti, D., Simons, K., & Keller, P. (2002). Splice variants of the beta-site APP-cleaving enzyme BACE1 in human brain and pancreas. Biochemical and Biophysical Research Communications, 293(1), 30-37.


Zitierlink: https://hdl.handle.net/21.11116/0000-0001-1356-9
Zusammenfassung
BACE is the beta-secretase responsible for the first step in amyloidogenic processing of the amyloid precursor protein APP. We have identified two BACE isoforms, BACE1B and BACE1C, lacking 25 and 44 amino acids, respectively. Whereas the BACE1B transcript is present in human pancreas and brain, the BACE1C transcript is found in pancreas only. In transfected cells both BACE1A, which encodes the originally described full-length BACE1 protein and the close homolog BACE2 localized mainly to post-Golgi membranes. In contrast, the two shorter isoforms were found in the endoplasmic reticulum only, and they did not display beta-secretase activity. Using RNase protection we in addition show that the major pancreatic transcript is BACE1A. This suggests that the known absence of beta-secretase activity in the pancreas is not due to a missing BACE1A transcript. (C) 2002 Elsevier Science (USA). All rights reserved.