Probable P-body-associated tubulin--tyrosine ligase. ATP + C-terminal L-alpha-aminoacyl-L-glutamyl-L-glutamyl-[tubulin] + L-tyrosine = ADP + C-terminal L-alpha-aminoacyl-L-glutamyl-L-glutamyl-L-tyrosyl-[tubulin] + H(+) + phosphate Present with 1770 molecules/cell in log phase SD medium. Belongs to the tubulin--tyrosine ligase family.