cytoplasmic polyadenylation element binding protein 1. Binds to the protein CPE and drives its polyadenylation. Activated by the protein kinase AurA. Insulin and progesterone stimulate AurA-catalyzed phosphorylation of CPEB in oocytes. Neuronal CPEB regulates local protein synthesis and stabilizes synapse-specific long-term facilitation in aplysia. Note: This description may include information from UniProtKB.