Enables queuine tRNA-ribosyltransferase activity. Involved in tRNA-guanine transglycosylation. Located in cytoplasm and nucleus. Part of protein-containing complex. Colocalizes with mitochondrion. Is expressed in several structures, including alimentary system; facial bone primordium; nervous system; respiratory system; and urinary system. Orthologous to human QTRT1 (queuine tRNA-ribosyltransferase catalytic subunit 1). [provided by Alliance of Genome Resources, Apr 2022]