Chemoenzymatic synthesis of multivalent neoglycoconjugates carrying the helminth glycan antigen LDNF

Boris Tefsen, Caroline M W van Stijn, Marloes van den Broek, Hakan Kalay, Jaco C Knol, Connie R Jimenez, Irma van Die

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Several parasitic helminthes, such as the human parasite Schistosoma mansoni, express glycoconjugates that contain terminal GalNAc beta1-4(Fuc alpha1-3)GlcNAc beta-R (LDNF) moieties. These LDNF glycans are dominant antigens of the parasite and are recognized by human dendritic cells via the C-type lectin DC-SIGN. To study the functional role of the LDNF antigen in interaction with the immune system, we have developed an easy chemoenzymatic method to synthesize multivalent neoglycoconjugates carrying defined amounts of LDNF antigens. An acceptor substrate providing a terminal N-acetylglucosamine was prepared by coupling a fluorescent hydrophobic aglycon, 2,6-diaminopyridine (DAP), to N,N'-diacetylchitobiose. By the subsequent action of recombinant Caenorhabditis elegans beta1,4-N-acetylgalactosaminyltransferase and human alpha1,3-fucosyltransferase VI (FucT-VI), this substrate was converted to the LDNF antigen. We showed that human FucT-VI has a relatively high affinity for the unusual substrate GalNAc beta1-4GlcNAc (LDN), and this enzyme was used to produce micromolar amounts of LDNF-DAP. The synthesized LDNF-DAP was coupled to carrier protein via activation of the DAP moiety by diethyl squarate. By varying the molar glycan:protein ratio, neoglycoconjugates were constructed with defined amounts of LDNF, as was determined by MALDI-TOF analysis and ELISA using an anti-LDNF antibody.

Original languageEnglish
Pages (from-to)1501-1507
Number of pages7
JournalCarbohydrate Research
Volume344
Issue number12
DOIs
Publication statusPublished - 17 Aug 2009
Externally publishedYes

Keywords

  • Animals
  • Antigens, Helminth/chemistry
  • Chromatography, High Pressure Liquid
  • Disaccharides/chemistry
  • Enzyme-Linked Immunosorbent Assay
  • Fucosyltransferases/genetics
  • Glycoconjugates/chemical synthesis
  • Humans
  • Lactose/analogs & derivatives
  • Models, Theoretical
  • Molecular Structure
  • N-Acetylgalactosaminyltransferases/genetics
  • Pyridines/chemistry
  • Recombinant Proteins/genetics
  • Spectrometry, Mass, Electrospray Ionization

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