UDP-N-acetylglucosamine transporter and UDP-galactose transporter form heterologous complexes in the Golgi membrane

► UDP-galactose transporter and UDP-N-acetylglucosamine transporter form complexes. ► NGT forms homodimers in vivo. ► Interaction between NGT and UGT2 explains the dual localization of UGT2. ► NGT and UGT function in glycosylation is combined via their mutual interaction.