Enables protein kinase binding activity and protein serine/threonine kinase activity. Involved in response to lipopolysaccharide and toll-like receptor signaling pathway. Predicted to be located in cytosol and nucleolus. Predicted to be active in cytoplasm and nucleoplasm. Is expressed in several structures, including alimentary system; blastocyst; branchial arch; central nervous system; and eye. Used to study Coffin-Lowry syndrome. Human ortholog(s) of this gene implicated in Coffin-Lowry syndrome; intellectual disability; and non-syndromic X-linked intellectual disability 19. Orthologous to human RPS6KA3 (ribosomal protein S6 kinase A3). [provided by Alliance of Genome Resources, Apr 2022]