Predicted to enable tetrahydrofolylpolyglutamate synthase activity. Predicted to be involved in cell population proliferation; glutamate metabolic process; and tetrahydrofolylpolyglutamate biosynthetic process. Predicted to act upstream of or within one-carbon metabolic process. Located in mitochondrion. Is expressed in several structures, including alimentary system; brain; genitourinary system; hemolymphoid system gland; and integumental system. Orthologous to human FPGS (folylpolyglutamate synthase). [provided by Alliance of Genome Resources, Apr 2022]