Dopamine- and cAMP-regulated neuronal phosphoprotein (DARP-32) is a cytoplasmic member of the protein phosphatase inhibitor 1 family. DARP-32 is a multifunctional protein kinase and protein phosphatase regulator, depending on the site of its activation. It possesses at least four sites that can be phosphorylated. Phosphorylation by PKA at Thr34 stimulates DARP-32 to act as a protein-phosphatase-1 (PP-1) inhibitor. However, phosphorylation at Thr75 will inhibit Thr34 phosphorylation. This selective, bidirectional regulation allows DARPP-32 to have a wide range of influence on downstream physiological effectors such as: ion pumps, neurotransmitter receptors, voltage-gate ion channels, and transcriptional factors. Studies suggest that it may also have a role in the Circadian System photic pathway. Overexpression of DARPP-32 has been linked with antiapoptotic mechanisms of cancer cells and has been observed in breast, colon, esophagus, gastric, and prostate cancer tissues.
Applications:
Suitable for use in Western Blot and Immunoprecipitation. Other applications have not been tested.
Recommended Dilutions:
Western Blot: 1ug/ml detects DARPP-32 on 10ug of rat brain tissue lysate.
Immunoprecipitation: 10ug immunoprecipitates DARPP-32 from rat brain RIPA lysate.
Optimal dilutions to be determined by the researcher.
Positive Control:
Rat brain tissue lysate
Storage and Stability:
May be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Aliquots are stable for at least 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
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