Chemo-enzymatic synthesis of the carbohydrate antigen N-glycolylneuraminic acid from glucose
作者:Oliver M.T. Pearce、Ajit Varki
DOI:10.1016/j.carres.2010.04.003
日期:2010.6
N-Glycolylneuraminic acid (Neu5Gc) is a non-human sialic acid, which may play a significant role in human pathologies, such as cancer and vascular disease. Further studies into the role of Neu5Gc in human disease are hindered by limited sources of this carbohydrate. Using a chemo-enzymatic approach, Neu5Gc was accessed in six steps from glucose. The synthesis allows access to gram-scale quantities quickly and economically and produces Neu5Gc in superior quality to commercial sources. Finally, we demonstrate that the synthesized Neu5Gc can be incorporated into the cell glycocalyx of human cells, which do not naturally synthesize this sugar. The synthesis produces Neu5Gc suitable for in vitro or in vivo use. (C) 2010 Elsevier Ltd. All rights reserved.
Chemoenzymatic synthesis of sialosides containing C7-modified sialic acids and their application in sialidase substrate specificity studies
作者:Zahra Khedri、Yanhong Li、Saddam Muthana、Musleh M. Muthana、Ching-Wen Hsiao、Hai Yu、Xi Chen
DOI:10.1016/j.carres.2014.02.021
日期:2014.5
chemoenzymatic synthesis of α2-3- and α2-6-linked sialyl para-nitrophenyl galactosides in which the C7-hydroxyl group in sialic acid (N-acetylneuraminic acid, Neu5Ac, or 2-keto-3-deoxynonulosonic acid, Kdn) was systematically substituted by -F, -OMe, -H, and -N3 groups. Substrate specificity study of bacterial and human sialidases using the obtained sialoside library containing C7-modified sialic acids showed
作者:Zahra Khedri、Musleh M. Muthana、Yanhong Li、Saddam M. Muthana、Hai Yu、Hongzhi Cao、Xi Chen
DOI:10.1039/c2cc17393j
日期:——
A library of α2–3- and α2–6-linked sialyl galactosides containing C9-modified sialic acids was synthesized from C6-modified mannose derivatives using an efficient one-pot three-enzyme system. These sialosides were used in a high-throughput sialidase substrate specificity assay to elucidate the importance of C9–OH in sialidase recognition.