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Originally published In Press as doi:10.1074/jbc.C200469200 on August 26, 2002

J. Biol. Chem., Vol. 277, Issue 42, 39062-39065, October 18, 2002
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ACCELERATED PUBLICATION
PEN-2 Is an Integral Component of the gamma -Secretase Complex Required for Coordinated Expression of Presenilin and Nicastrin*

Harald SteinerDagger §, Edith WinklerDagger , Dieter EdbauerDagger , Stefan ProkopDagger , Gabriele BassetDagger , Aya YamasakiDagger , Marcus Kostka, and Christian HaassDagger ||

From the Dagger  Adolf-Butenandt-Institute, Department of Biochemistry, Laboratory for Alzheimer's and Parkinson's Disease Research, Schillerstrasse 44, Ludwig-Maximilians-University, 80336 Munich, Germany and  Boehringer Ingelheim Pharma KG, Department of CNS Research, Birkendorferstrasse 65, 88397 Biberach/Riss, Germany

The Alzheimer disease-associated presenilin (PS) proteins apparently provide the active site of gamma -secretase, an unusual intramembrane-cleaving aspartyl protease. PSs principally occur as high molecular weight protein complexes that contain nicastrin (Nct) and additional so far unidentified components. Recently, PEN-2 has been implicated in gamma -secretase function. Here we identify PEN-2 as a critical component of PS1/gamma -secretase and PS2/gamma -secretase complexes. Strikingly, in the absence of PS1 and PS1/PS2, PEN-2 levels are strongly reduced. Similarly, PEN-2 levels are reduced upon RNA interference-mediated down-regulation of Nct. On the other side, down-regulation of PEN-2 by RNA interference is associated with reduced PS levels, impaired Nct maturation, and deficient gamma -secretase complex formation. We conclude that PEN-2 is an integral gamma -secretase complex component and that gamma -secretase complex components are expressed in a coordinated manner.


* This work was supported by the Deutsche Forschungsgemeinschaft (Priority program "Cellular Mechanisms of Alzheimer's Disease") and the National Genome Research Network (NGFN).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

§ To whom correspondence may be addressed. Tel.: 49-89-5996-480; Fax: 49-89-5996-415; E-mail: hsteiner@pbm.med.uni-muenchen.de.

|| To whom correspondence may be addressed. Tel.: 49-89-5996-471/472; Fax: 49-89-5996-415; E-mail: chaass@pbm.med.uni-muenchen.de.


Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.


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K. Shirotani, D. Edbauer, A. Capell, J. Schmitz, H. Steiner, and C. Haass
gamma -Secretase Activity Is Associated with a Conformational Change of Nicastrin
J. Biol. Chem., May 2, 2003; 278(19): 16474 - 16477.
[Abstract] [Full Text] [PDF]


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