Enables molecular adaptor activity. Involved in positive regulation of aminoacyl-tRNA ligase activity and protein-containing complex assembly. Acts upstream of or within negative regulation of cell population proliferation; positive regulation of protein ubiquitination; and type II pneumocyte differentiation. Located in nucleus. Part of aminoacyl-tRNA synthetase multienzyme complex. Is expressed in several structures, including olfactory epithelium; orbito-sphenoid; submandibular gland primordium; thymus primordium; and tooth. Human ortholog(s) of this gene implicated in hypomyelinating leukodystrophy. Orthologous to human AIMP2 (aminoacyl tRNA synthetase complex interacting multifunctional protein 2). [provided by Alliance of Genome Resources, Apr 2022]