title: p120 catenin recruits cadherins to gamma-secretase and inhibits production of Abeta peptide.
abstract: The gamma-secretase complex cleaves many transmembrane proteins, including amyloid precursor protein, EphB and ErbB tyrosine kinase receptors, Notch1 receptors, and adhesion factors. Presenilin 1, the catalytic subunit of gamma-secretase, associates with the cadherin/catenin cell-cell adhesion/communication system and promotes cadherin processing (Georgakopoulos, A., et al. (1999) Mol. Cell 4, 893-902; Marambaud, P., et al. (2002) EMBO J. 21, 1948-1956), but the mechanism by which gamma-secretase and cadherins associate is unclear. Here we report that p120 catenin (p120ctn), a component of the cadherin-catenin complex, recruits gamma-secretase to cadherins, thus stimulating their processing while inhibiting production of Abeta peptide and the amyloid precursor protein intracellular domain. This function of p120ctn depends on both p120ctn-cadherin and p120ctn-presenilin 1 binding, indicating that p120ctn is the central factor that bridges gamma-secretase and cadherin-catenin complexes. Our data show that p120ctn is a unique positive regulator of the gamma-secretase processing of cadherins and a negative regulator of the amyloid precursor protein processing. Furthermore, our data suggest that specific members of the gamma-secretase complex may be used to recruit different substrates and that distinct PS1 sequences are required for processing of APP and cadherins.
authors.affiliation: Department of Psychiatry, Mount Sinai School of Medicine, New York, New York 10029, USA.
authors.forename: Zen
authors.initials: Z
authors.lastname: Kouchi
authors.forename: Gael
authors.initials: G
authors.lastname: Barthet
authors.forename: Geo
authors.initials: G
authors.lastname: Serban
authors.forename: Anastasios
authors.initials: A
authors.lastname: Georgakopoulos
authors.forename: Junichi
authors.initials: J
authors.lastname: Shioi
authors.forename: Nikolaos K
authors.initials: NK
authors.lastname: Robakis
mesh_terms: D053829:Amyloid Precursor Protein Secretases / Q000378:metabolism*; D016229:Amyloid beta-Peptides / Q000096:biosynthesis*; D000818:Animals; D055162:Biocatalysis; D015820:Cadherins / Q000235:genetics / Q000378:metabolism*; D051177:Catenins; D015815:Cell Adhesion Molecules / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D017353:Gene Deletion; D006801:Humans; D051379:Mice; D009154:Mutation / Q000235:genetics; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism*; D053764:Presenilin-1 / Q000378:metabolism; D011485:Protein Binding; D000095002:Delta Catenin
chemical_list: D016229:Amyloid beta-Peptides; D015820:Cadherins; D051177:Catenins; D015815:Cell Adhesion Molecules; D010750:Phosphoproteins; D053764:Presenilin-1; D053829:Amyloid Precursor Protein Secretases; D000095002:Delta Catenin