The present invention can provide a process for producing a protein having .alpha.1.4-galactosyltransferase activity using a transformant comprising a DNA encoding a protein having .alpha.1.4-galactosyltransferase activity derived from a microorganism belonging to the genus Pasteurella and a process for producing a galactose-containing complex carbohydrate using a transformant capable of producing a protein having .alpha.1,4-galactosyltransferase activity derived from a microorganism.