Interacts with MAPK kinases and regulates activation of MAP kinases. Does not display kinase activity (By similarity). May associate with the cytoskeleton. Expressed in granulosa cells of the dominant follicles of the ovary and down-regulated in ovulatory follicles. The protein kinase domain is predicted to be catalytically inactive. Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family. Tribbles subfamily.