catalytic activity:ATP + a protein = ADP + a phosphoprotein.,function:Phosphorylates serine- and arginine-rich (SR) proteins of the spliceosomal complex. May be a constituent of a network of regulatory mechanisms that enable SR proteins to control RNA splicing. Phosphorylates serines, threonines and tyrosines.,PTM:Autophosphorylates on all three types of residues.,similarity:Belongs to the protein kinase superfamily.,similarity:Belongs to the protein kinase superfamily. CMGC Ser/Thr protein kinase family. Lammer subfamily.,similarity:Contains 1 protein kinase domain.,
[Isoform 1]: Nucleus. Cytoplasm . Cytoplasmic vesicle, secretory vesicle, acrosome .; [Isoform 2]: Nucleus speckle. Co-localizes with serine- and arginine-rich (SR) proteins in the nuclear speckles.
Endothelial cells.
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