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Volume 272, Number 6, Issue of February 7, 1997 pp. 3590-3598
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Phosphorylation, Subcellular Localization, and Membrane Orientation of the Alzheimer's Disease-associated Presenilins

(Received for publication, May 30, 1996, and in revised form, October 1, 1996)

Bart De Strooper Dagger , Monique Beullens , Bart Contreras par , Lyne Levesque ** , Katleen Craessaerts Dagger , Barbara Cordell Dagger Dagger , Dieder Moechars Dagger , Mathieu Bollen , Paul Fraser ** , Peter St. George-Hyslop ** and Fred Van Leuven Dagger

From the Dagger  Experimental Genetics Group and par  Molecular Oncology Group, Center for Human Genetics, and the  Laboratory of Biochemistry, Katholieke Universiteit, 3000 Leuven, Belgium, the ** Center for Research in Neurodegenerative Diseases, Department of Medicine (Neurology) and Medical Biophysics, University of Toronto, Toronto, Ontario M5S 1A8, Canada, and Dagger Dagger  Scios Inc., Sunnyvale, California 94043

Presenilins 1 and 2 are unglycosylated proteins with apparent molecular mass of 45 and 50 kDa, respectively, in transfected COS-1 and Chinese hamster ovary cells. They colocalize with proteins from the endoplasmic reticulum and the Golgi apparatus in transfected and untransfected cells. In COS-1 cells low amounts of intact endogeneous presenilin 1 migrating at 45 kDa are detected together with relative larger amounts of presenilin 1 fragments migrating between 18 and 30 kDa. The presenilins have a strong tendency to form aggregates (mass of 100-250 kDa) in SDS-polyacrylamide gel electrophoresis, which can be partially resolved when denatured by SDS at 37 °C instead of 95 °C. Sulfation, glycosaminoglycan modification, or acylation of the presenilins was not observed, but both proteins are posttranslationally phosphorylated on serine residues. The mutations Ala-246 right-arrow Glu or Cys-410 right-arrow Tyr that cause Alzheimer's disease do not interfere with the biosynthesis or phosphorylation of presenilin 1. Finally, using low concentrations of digitonin to selectively permeabilize the cell membrane but not the endoplasmic reticulum membrane, it is demonstrated that the two major hydrophilic domains of presenilin 1 are oriented to the cytoplasm. The current investigation documents the posttranslational modifications and subcellular localization of the presenilins and indicates that postulated interactions with amyloid precursor protein metabolism should occur in the early compartments of the biosynthetic pathway.


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