| Autor: |
Dumon, Claire, Priem, Bernard, Martin, Steve, Heyraud, Alain, Bosso, Claude, Samain, Eric |
| Zdroj: |
Glycoconjugate Journal; Jun2001, Vol. 18 Issue 6, p465-474, 10p |
| Abstrakt: |
We report here the in vivo production of type 2 fucosylated- N-acetyllactosamine oligosaccharides in Escherichia coli. Lacto- N-neofucopentaose Galβ1-4GlcNAcβ1-3Galβ1-4(Fucα1-3)Glc, lacto- N-neodifucohexaose Galβ1-4(Fucα1-3)Glc-NAcβ1-3Galβ1-4(Fucα1-3)Glc, and lacto- N-neodifucooctaose Galβ1-4GlcNAcβ1-3Galβ1-4(Fucα1-3)GlcNAcβ1-3Galβ1-4(Fucα1-3)Glc were produced from lactose added in the culture medium. Two of them carry the Lewis X human antigen. High cell density cultivation allowed obtaining several grams of fucosylated oligosaccharides per liter of culture. The fucosylation reaction was catalyzed by an α-1,3 fucosyltransferase of Helicobacter pylori overexpressed in E. coli with the genes lgtAB of N. meningitidis. The strain was genetically engineered in order to provide GDP-fucose to the system, by genomic inactivation of gene wcaJ involved in colanic acid synthesis and overexpression of RcsA, positive regulator of the colanic acid operon. To prevent fucosylation at the glucosyl residue, lactulose Galβ1-4Fru was assayed in replacement of lactose. Lactulose-derived oligosaccharides carrying fucose were synthesized and characterized. Fucosylation of the fructosyl residue was observed, indicating a poor acceptor specificity of the fucosyltransferase of H. pylori. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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