a member of the protein phosphatase inhibitor 1 family. A dopamine- and cyclic AMP-regulated neuronal phosphoprotein. Both dopaminergic and glutamatergic (NMDA) receptor stimulation regulate the extent of DARPP32 phosphorylation, but in opposite directions. Dopamine D1 receptor stimulation enhances cAMP formation, resulting in the phosphorylation of DARPP32; phosphorylated DARPP32 is a potent protein phosphatase-1 inhibitor. NMDA receptor stimulation elevates intracellular calcium, which leads to activation of calcineurin and dephosphorylation of phospho-DARPP32, thereby reducing the phosphatase-1 inhibitory activity of DARPP32. Two alternatively-spliced isoforms have been described. Note: This description may include information from UniProtKB.
Protein type: Motility/polarity/chemotaxis; Protein phosphatase, regulatory subunit
Molecular Function: cAMP-dependent protein kinase inhibitor activity; protein binding; protein kinase inhibitor activity; protein phosphatase inhibitor activity; protein phosphatase regulator activity; type 1 serine/threonine specific protein phosphatase inhibitor activity
Biological Process: negative regulation of phosphoprotein phosphatase activity; signal transduction