Enables aminoacyltransferase activity. Involved in several processes, including liver development; peptide modification; and response to estradiol. Located in extracellular space. Biomarker of alcohol dependence. Human ortholog(s) of this gene implicated in gamma-glutamyl transpeptidase deficiency. Orthologous to several human genes including GGT1 (gamma-glutamyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]