α(1-3)-Galactosyltransferase Inhibition Based on a New Type of Disubstrate Analogue This work was supported financially by the Deutschen Forschungsgemeinschaft and the Fonds der Chemischen Industrie.

How do retaining glycosyltransferases function? To answer this question, UDP-Gal and galactose were covalently linked to form disubstrate analogues 1, of which surprisingly 1β and not 1α inhibited α(1-3)-galactosyltransferases very well. An understanding of this inhibition is a key to the pharmacological prevention of hyperacute rejection in pig to primate xenotransplantation.