Presenilin 1 associates with glycogen synthase kinase-3beta and its substrate tau.
Families bearing mutations in the presenilin 1 (PS1) gene develop Alzheimer's disease. Previous studies have shown that the Alzheimer-associated mutations in PS1 increase production of amyloid beta protein (Abeta1-42). We now show that PS1 also regulates phosphorylation of the microtubule-associated protein tau. PS1 directly binds tau and a tau kinase, glycogen synthase kinase 3beta (GSK-3beta). Deletion studies show that both tau and GSK-3beta bind to the same region of PS1, residues 250-298, whereas the binding domain on tau is the microtubule-binding repeat region. The ability of PS1 to bring tau and GSK-3beta into close proximity suggests that PS1 may regulate the interaction of tau with GSK-3beta. Mutations in PS1 that cause Alzheimer's disease increase the ability of PS1 to bind GSK-3beta and, correspondingly, increase its tau-directed kinase activity. We propose that the increased association of GSK-3beta with mutant PS1 leads to increased phosphorylation of tau.
Takashima
A
A
Laboratory for Alzheimer's Disease, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 350-01, Japan.
Murayama
M
M
Murayama
O
O
Kohno
T
T
Honda
T
T
Yasutake
K
K
Nihonmatsu
N
N
Mercken
M
M
Yamaguchi
H
H
Sugihara
S
S
Wolozin
B
B
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001921:Brain / Q000201:enzymology / Q000378:metabolism; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism*; D002846:Chromatography, Affinity; D038362:Glycogen Synthase Kinase 3; D038341:Glycogen Synthase Kinases; D006801:Humans; D007231:Infant, Newborn; D008565:Membrane Proteins / Q000302:isolation & purification / Q000378:metabolism*; D008875:Middle Aged; D011233:Precipitin Tests; D053764:Presenilin-1; D013379:Substrate Specificity; D016875:tau Proteins / Q000378:metabolism*
D008565:Membrane Proteins; C508853:PSEN1 protein, human; D053764:Presenilin-1; D016875:tau Proteins; D038341:Glycogen Synthase Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D038362:Glycogen Synthase Kinase 3