PRKD1/PKD1

Protein kinase D1 (PKD1), encoded by PRKD1 and once called PKCμ, sits at the crossroads of DAG signaling and vesicular trafficking. Twin C1 domains recruit it to the trans-Golgi network and plasma membrane, where novel PKCs phosphorylate its activation loop and a subsequent autophosphorylation sustains activity. PKD1 regulates Golgi-to-plasma-membrane transport, NF-κB activation, HDAC5 export in cardiac hypertrophy, and cell migration and proliferation. Among the three PKD isoforms it is the best characterized and most broadly expressed. Its roles in tumor angiogenesis, metastasis and cardiac disease have made PKD1 a template for PKD-family inhibitor design.