Tubulin-binding protein that acts as a negative regulator of Notch signaling pathway. Shuttles between the cytoplasm and the nucleus and mediates the nuclear export of rbpj/rbpsuh, thereby preventing the interaction between rbpj/rbpsuh and NICD product of Notch proteins (Notch intracellular domain), leading to down-regulate Notch-mediated transcription. May play a role in neurogenesis. Interacts with rbpj/rbpsuh. Shuttles rapidly between the cytoplasm and the nucleus. Belongs to the RITA family.