Specifically phosphorylates the activated forms of G protein-coupled receptors (By similarity). Required during oogenesis and embryogenesis; component of a signaling pathway that functions during egg chamber maturation. [G-protein-coupled receptor] + ATP = [G-protein-coupled receptor]-phosphate + ADP + H(+) Associated with nurse cell and oocyte plasma membranes during much of oogenesis. Expressed in all larval tissues and in adult ovaries. Larval CNS staining is localized to axons projecting to the optic lobes and the mushroom bodies, in the longitudinal connectives, and in cell bodies and nerves of the ring gland corpus allatum. Adult CNS staining is detectable only in cell bodies and processes associated with the ellipsoid body of the central complex and portions of the mushroom bodies. In the wing disk, expression is confined to a stripe that parallels the anterior/posterior boundary of the wing blade and the hinge region, and weak expression in the prospective notum. Expressed both maternally and zygotically. Adult females show severely reduced number of egg chambers and the small germarium in ovarioles. The rare eggs that become fertilized display gross defects in embryogenesis exhibiting fusion of adjacent segments and holes in the dorsal and ventral cuticle. Belongs to the protein kinase superfamily. AGC Ser/Thr protein kinase family. GPRK subfamily.