Predicted to enable tubulin binding activity and tubulin-glutamic acid ligase activity. Acts upstream of or within fertilization; protein polyglutamylation; and sperm axoneme assembly. Located in 9+0 non-motile cilium and ciliary basal body. Is expressed in choroid invagination; diencephalon roof plate; medulla oblongata part of 4th ventricle choroid plexus; and metencephalon part of 4th ventricle choroid plexus. Human ortholog(s) of this gene implicated in cone-rod dystrophy 19. Orthologous to human TTLL5 (tubulin tyrosine ligase like 5). [provided by Alliance of Genome Resources, Apr 2022]