Enzymatic synthesis of 7-deoxy-N-acetylneuraminic acid and 7-O-methyl-N-acetylneuraminic acid
摘要:
7-Deoxy-N-acetylneuraminic Acid and 7-O-methyl-N-acetylneuraminic acid were synthesized through the sialic acid aldolase-cataIyzed aldol addition reactions of 4-deoxy-N-acetyl-D-mannosamine and 4-O-methyl-N-acetyl-D-mannosamine, respectively, with pyruvate. The obtained sialic acids will be used as probes for the investigation of the unusual mechanism of a novel sialidase from leech.
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
N-acetylmannosamine (ManNAc) and analogues. The obtained Neu5Ac2en analogues can be further derivatized at various positions to generate a larger inhibitor library. Inhibition studies demonstrated improved selectivity of several C-5- or C-9-modified Neu5Ac2en derivatives against several bacterial sialidases. The study provides an efficient enzymatic method to access sialidaseinhibitors with improved selectivity
Substitution of 7-OH by small hydrophobic groups on zanamivir resulted in the retaining of low nanomolar inhibitory activities against not only influenza A virus sialidase but also influenza A virus in cell culture. These compounds were prepared by treatment of the corresponding 7-substituted sialic acids derived from 4-modified N-acetyl-D-mannosamine (ManNAc) using enzyme-catalyzed aldol condensation. (C) 2002 Elsevier Science Ltd. All rights reserved.
Cerny, Ivan; Trnka, Tomas; Cerny, Miloslav, Collection of Czechoslovak Chemical Communications, 1983, vol. 48, # 8, p. 2386 - 2394
作者:Cerny, Ivan、Trnka, Tomas、Cerny, Miloslav
DOI:——
日期:——
MULZER, JOHANN;SEILZ, CARSTEN;REUTTER, WERNER, LIEBIGS ANN. CHEM.,(1991) N, C. 957-960