Abstract |
A chemo-enzymatic synthesis of [(5-acetamido-9-O-acetyl-3,5-dideoxy-D-glycero-alpha-D-galacto-2-nonulopyranosylonic acid)-(2-->3)-O-(beta-D-galactopyranosyl)-(1-->3)-O-(2-acetamido-2-deoxy-alpha-D-galactopyranosyl)]- l-serine acetate (1) has been accomplished by a regioselective chemical acetylation of Neu5Ac (2) to give 9-O-acetylated sialic acid 3, which was enzymatically converted into CMP-Neu5,9Ac(2) (4) employing a recombinant CMP-sialic acid synthetase from Neisseria meningitis [EC 2.7.7.43]. The resulting compound was then employed for the enzymatic glycosylation of the C-3' hydroxyl of chemically prepared glycosylated amino acid 10 using recombinant rat alpha-(2-->3)-O- sialyltransferase expressed in Spodooptera frugiperda [EC 2.4.99.4] to give, after deprotection of the N(alpha)-benzyloxycarbonyl (CBz)-protecting group of serine, target compound 1. The N(alpha)-CBz-protected intermediate 11 can be employed for the synthesis of glycolipopeptides for immunization purposes.
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Authors | Jana Rauvolfova, Andre Venot, Geert-Jan Boons |
Journal | Carbohydrate research
(Carbohydr Res)
Vol. 343
Issue 10-11
Pg. 1605-11
(Jul 21 2008)
ISSN: 0008-6215 [Print] Netherlands |
PMID | 18508039
(Publication Type: Journal Article, Research Support, N.I.H., Extramural)
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Chemical References |
- Cytidine Monophosphate N-Acetylneuraminic Acid
- Sialyltransferases
- N-Acylneuraminate Cytidylyltransferase
- N-Acetylneuraminic Acid
- beta-Galactoside alpha-2,3-Sialyltransferase
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Topics |
- Animals
- Cytidine Monophosphate N-Acetylneuraminic Acid
(analogs & derivatives, chemical synthesis)
- N-Acetylneuraminic Acid
(chemical synthesis)
- N-Acylneuraminate Cytidylyltransferase
(metabolism)
- Sialyltransferases
(metabolism)
- beta-Galactoside alpha-2,3-Sialyltransferase
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