p35/cdk5 binds and phosphorylates beta-catenin and regulates beta-catenin/presenilin-1 interaction
- PMID:11168528
p35/cdk5 binds and phosphorylates beta-catenin and regulates beta-catenin/presenilin-1 interaction
Abstract
The neuronal cyclin-dependent kinase p35/cdk5 comprises a catalytic subunit (cdk5) and an activator subunit (p35). To identify novel p35/cdk5 substrates, we utilized the yeast two-hybrid system to screen for human p35 binding partners. From one such screen, we identified beta-catenin as an interacting protein. Confirmation that p35 binds to beta-catenin was obtained by using glutathione S-transferase (GST)-beta-catenin fusion proteins that interacted with both endogenous and transfected p35, and by showing that beta-catenin was present in p35 immunoprecipitates. p35 and beta-catenin also displayed overlapping subcellular distribution patterns in cells including neurons. Finally, we demonstrated that p35/cdk5 phosphorylates beta-catenin. beta-catenin also binds to presenilin-1 and altered beta-catenin/presenilin-1 interactions may be mechanistic in Alzheimer's disease (AD). Abnormal p35/cdk5 activity has also been suggested to contribute to AD. We therefore investigated how modulation of p35/cdk5 activity influenced beta-catenin/presenilin-1 interactions. Inhibition of p35/cdk5 with roscovitine did not alter the steady state levels of either beta-catenin or presenilin-1 but reduced the amount of presenilin-1 bound to beta-catenin. Thus, p35/cdk5 binds and phosphorylates beta-catenin and regulates its binding to presenilin-1. The findings reported here therefore provide a novel molecular framework to connect p35/cdk5 with beta-catenin and presenilin-1 in AD.
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