Synthesis of GDP-5-thiosugars and Their Use as Glycosyl Donor Substrates for Glycosyltransferases
作者:Osamu Tsuruta、Hideya Yuasa、Hironobu Hashimoto、Keiko Sujino、Albin Otter、Hong Li、Monica M. Palcic
DOI:10.1021/jo0300035
日期:2003.8.1
Two thiopyranoside analogues of GDP-sugars, GDP-5-thio-D-mannose (14) and GDP-5-thio-L-fucose (15), were synthesized. The syntheses included the phosphorylations of tetra-O-acetyl-5-thio-D-mannosyl bromide (4) and tri-O-benzoyl-L-fucosyl bromide (6) with silver dibenzyl phosphate, deprotection of the phosphate groups, and condensation of the deprotected phosphates with GMP-imidazolidate (13) in the presence of MgCl2. These GDP-sugar analogues were found to be donor substrates for alpha(1,2)mannosyltransferase and alpha(1,3)fucosyltransferase, affording a 5-thiomannose-containing disaccharide (18) and a 5-thiofucose-containing trisaccharide (21), respectively. The conformation of the disaccharide analogue 18 was similar to that of its native counterpart by ROESY. These findings for GDP-5-thiosugars together with previous demonstrations of enzymatic transfer from UDP-5-thiosugars will allow the production of panels of oligosaccharide analogues with hydrolase-resistant properties.