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J Biol Chem. 2013 May 24;288(21):15352-66. doi: 10.1074/jbc.M112.441840. Epub 2013 Apr 15.

Interactome analyses of mature γ-secretase complexes reveal distinct molecular environments of presenilin (PS) paralogs and preferential binding of signal peptide peptidase to PS2.

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  • 1Department of Laboratory Medicine and Pathobiology, Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario M5S3H2, Canada.

Abstract

γ-Secretase plays a pivotal role in the production of neurotoxic amyloid β-peptides (Aβ) in Alzheimer disease (AD) and consists of a heterotetrameric core complex that includes the aspartyl intramembrane protease presenilin (PS). The human genome codes for two presenilin paralogs. To understand the causes for distinct phenotypes of PS paralog-deficient mice and elucidate whether PS mutations associated with early-onset AD affect the molecular environment of mature γ-secretase complexes, quantitative interactome comparisons were undertaken. Brains of mice engineered to express wild-type or mutant PS1, or HEK293 cells stably expressing PS paralogs with N-terminal tandem-affinity purification tags served as biological source materials. The analyses revealed novel interactions of the γ-secretase core complex with a molecular machinery that targets and fuses synaptic vesicles to cellular membranes and with the H(+)-transporting lysosomal ATPase macrocomplex but uncovered no differences in the interactomes of wild-type and mutant PS1. The catenin/cadherin network was almost exclusively found associated with PS1. Another intramembrane protease, signal peptide peptidase, predominantly co-purified with PS2-containing γ-secretase complexes and was observed to influence Aβ production.

KEYWORDS:

Alzheimers Disease; Interactome; Mass Spectrometry (MS); Presenilin; Proteomics; Secretases; Transgenic

PMID:
23589300
[PubMed - indexed for MEDLINE]
PMCID:
PMC3663554
Free PMC Article
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