Background: Tideglusib is a GSK-3 inhibitor currently undergoing clinical trials for Alzheimer disease and progressive supranuclear palsy. Results: Removal of unbound compound does not recover the enzyme activity, and the dissociation rate constant is close to zero. The protein shows a low turnover rate in neurons. Conclusion: Tideglusib is an irreversible inhibitor of GSK-3. Significance: The irreversibility and the long enzyme half-life may possess interesting pharmacodynamic implications.
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