SRSF protein kinase 2 (SRPK2)

Serine/arginine-rich protein-specific kinase which specifically phosphorylates its substrates at serine residues located in areas full of arginine/serine dipeptides, known as RS domains and is involved in the phosphorylation of SR splicing factors and the regulation of splicing. Promotes neuronal apoptosis by up-regulating cyclin-D1 (CCND1) expression.

This is carried out by the phosphorylation of SRSF2, causing the suppression of p53/TP53 phosphorylation thereby relieving the repressive effect of p53/TP53 on cyclin-D1 (CCND1) expression. Phosphorylates ACIN1, and redistributes it from the nuclear speckles to the nucleoplasm, resulting in cyclin A1 but not cyclin A2 up- regulation.