Regulates stability of MYCN in neuroblastoma cells by inhibiting GSK3B-mediated MYCN phosphorylation. Inhibits GSK3B activity by promoting its phosphorylation at 'Ser-9' (PubMed:24391509). Interacts with MYCN and GSK3B. Expressed in the neuronal cells of the cerebrum and cerebellum, spermatocytes of the testis, pancreatic cells and also the heart. Expressed in both primary and metastatic neuroblastomas and in thyroid tumors (at protein level). Expression is associated with poor prognosis in neuroblastoma. Expressed in the fetal brain, lung, liver and kidney at varying low levels. Expressed during fetal development, as well as in tumor cell lines containing amplified MYCN loci, where it is expressed at very high levels.