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Nucleotide sugar transporters are mainly located in the Golgi membranes and carry nucleotide sugars, that are produced outside the Golgi apparatus, into the organelle, where they serve as substrates for the elongation of carbohydrate chains by glycosyltransferases. They are thus indispensable for cellular glycoconjugate synthesis and, moreover, may have regulatory roles in producing the structural variety of cellular glycoconjugates. Their occurrence has long been well recognized, but studies on the molecular bases of their strict substrate specificities and modes of action have been hampered by the lack of information on their precise molecular structures. Complementary DNAs encoding several of these transporters were cloned recently, which represented a substantial step forward as to the above mentioned issues. The products of these cDNAs are mutually related hydrophobic proteins consisting of 320-400 amino acid residues with multiple putative transmembrane helix domains, and are located in the Golgi apparatus. This review briefly summarizes the present status of the field of nucleotide sugar transporter research, and also presents an outlook of the study in this field.

Nucleotide Sugar Transporters: Elucidation of Their Molecular Identity and Its Implication for Future Studies