Presenilin-1 binds cytoplasmic epithelial cadherin, inhibits cadherin/p120 association, and regulates stability and function of the cadherin/catenin adhesion complex.
Here we show that presenilin-1 (PS1), a protein involved in Alzheimer's disease, binds directly to epithelial cadherin (E-cadherin). This binding is mediated by the large cytoplasmic loop of PS1 and requires the membrane-proximal cytoplasmic sequence 604-615 of mature E-cadherin. This sequence is also required for E-cadherin binding of protein p120, a known regulator of cadherin-mediated cell adhesion. Using wild-type and PS1 knockout cells, we found that increasing PS1 levels suppresses p120/E-cadherin binding, and increasing p120 levels suppresses PS1/E-cadherin binding. Thus PS1 and p120 bind to and mutually compete for cellular E-cadherin. Furthermore, PS1 stimulates E-cadherin binding to beta- and gamma-catenin, promotes cytoskeletal association of the cadherin/catenin complexes, and increases Ca(2+)-dependent cell-cell aggregation. Remarkably, PS1 familial Alzheimer disease mutant DeltaE9 increased neither the levels of cadherin/catenin complexes nor cell aggregation, suggesting that this familial Alzheimer disease mutation interferes with cadherin-based cell-cell adhesion. These data identify PS1 as an E-cadherin-binding protein and a regulator of E-cadherin function in vivo.
Baki
L
L
Department of Psychiatry, Fishberg Research Center for Neurobiology, Mount Sinai School of Medicine, One Gustave Levy Place, New York, NY 10029, USA.
Marambaud
P
P
Efthimiopoulos
S
S
Georgakopoulos
A
A
Wen
P
P
Cui
W
W
Shioi
J
J
Koo
E
E
Ozawa
M
M
Friedrich
V L
VL
Robakis
N K
NK
D000818:Animals; D001667:Binding, Competitive; D015820:Cadherins / Q000378:metabolism*; D002448:Cell Adhesion; D002460:Cell Line; D003593:Cytoplasm / Q000378:metabolism; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D003599:Cytoskeleton / Q000378:metabolism; D004847:Epithelial Cells / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism*; D051379:Mice; D053764:Presenilin-1; D011485:Protein Binding; D015534:Trans-Activators; D051176:beta Catenin
C495267:CTNNB1 protein, mouse; D015820:Cadherins; D003598:Cytoskeletal Proteins; D008565:Membrane Proteins; D053764:Presenilin-1; D015534:Trans-Activators; D051176:beta Catenin