Predicted to enable microtubule binding activity and tubulin-glutamic acid ligase activity. Predicted to be involved in protein polyglutamylation. Predicted to act upstream of or within several processes, including adult behavior; chemical synaptic transmission; and sperm axoneme assembly. Predicted to be located in centrosome. Orthologous to human TPGS1 (tubulin polyglutamylase complex subunit 1). [provided by Alliance of Genome Resources, Apr 2022]