Chemoenzymatic synthesis of C8-modified sialic acids and related α2–3- and α2–6-linked sialosides
作者:Hai Yu、Hongzhi Cao、Vinod Kumar Tiwari、Yanhong Li、Xi Chen
DOI:10.1016/j.bmcl.2011.04.083
日期:2011.9
Naturally occurring 8-O-methylated sialic acids, including 8-O-methyl-N-acetylneuraminic acid and 8-O-methyl-N-glycolylneuraminic acid, along with 8-O-methyl-2-keto-3-deoxy-D-glycero-D-galactononulosonic acid (Kdn8Me) and 8-deoxy-Kdn were synthesized from corresponding 5-O-modified six-carbon monosaccharides and pyruvate using a sialic acid aldolase cloned from Pasteurella multocida strain P-1059 ( PmNanA). In addition, alpha 2-3- and alpha 2-6-linked sialyltrisaccharides containing Neu5Ac8Me and Kdn8Deoxy were also synthesized using a one-pot multienzyme approach. The strategy reported here provides an efficient approach to produce glycans containing various C8-modified sialic acids for biological evaluations. (C) 2011 Elsevier Ltd. All rights reserved.