Metabolism of diazirine-modified N -acetylmannosamine analogues to photo-cross-linking sialosides

Michelle R. Bond, Haochi Zhang, Jaekuk Kim, Seok Ho Yu, Fan Yang, Steven M. Patrie, Jennifer J. Kohler

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Terminal sialic acid residues often mediate the interactions of cell surface glycoconjugates. Sialic acid-dependent interactions typically exhibit rapid dissociation rates, precluding the use of traditional biological techniques for complex isolation. To stabilize these transient interactions, we employ a targeted photo-cross-linking approach in which a diazirine photo-cross-linker is incorporated into cell surface sialylated glycoconjugates through the use of metabolic oligosaccharide engineering. We describe three diazirine-modified N-acetylmannosamine (ManNAc) analogues in which the length of the linker between the pyranose ring and the diazirine was varied. These analogues were each metabolized to their respective sialic acid counterparts, which were added to both glycoproteins and glycolipids. Diazirine-modified sialic acid analogues could be incorporated into both α2-3 and α2-6 linkages. Upon exposure to UV irradiation, diazirine-modified glycoconjugates were covalently cross-linked to their interaction partners. We demonstrate that all three diazirine-modified analogues were capable of competing with endogeneous sialic acid, albeit to varying degrees. We found that larger analogues were less efficiently metabolized, yet could still function as effective cross-linkers. Notably, the addition of the diazirine substituent interferes with metabolism of ManNAc analogues to glycans other than sialosides, providing fidelity to selectively incorporate the cross-linker into sialylated molecules. These compounds are nontoxic and display only minimal growth inhibition at the concentrations required for cross-linking studies. This report provides essential information for the deployment of photo-cross-linking analogues to capture and study ephemeral, yet essential, sialic acid-mediated interactions.

Original languageEnglish (US)
Pages (from-to)1811-1823
Number of pages13
JournalBioconjugate Chemistry
Volume22
Issue number9
DOIs
StatePublished - Sep 21 2011

Fingerprint

Diazomethane
Metabolism
N-Acetylneuraminic Acid
Acids
Glycoconjugates
Oligosaccharides
Glycoproteins
Metabolic Engineering
Glycolipids
N-acetylmannosamine
Cell Communication
Polysaccharides
Irradiation
Molecules
Growth

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Organic Chemistry
  • Pharmaceutical Science
  • Biomedical Engineering
  • Pharmacology

Cite this

Metabolism of diazirine-modified N -acetylmannosamine analogues to photo-cross-linking sialosides. / Bond, Michelle R.; Zhang, Haochi; Kim, Jaekuk; Yu, Seok Ho; Yang, Fan; Patrie, Steven M.; Kohler, Jennifer J.

In: Bioconjugate Chemistry, Vol. 22, No. 9, 21.09.2011, p. 1811-1823.

Research output: Contribution to journalArticle

Bond, Michelle R. ; Zhang, Haochi ; Kim, Jaekuk ; Yu, Seok Ho ; Yang, Fan ; Patrie, Steven M. ; Kohler, Jennifer J. / Metabolism of diazirine-modified N -acetylmannosamine analogues to photo-cross-linking sialosides. In: Bioconjugate Chemistry. 2011 ; Vol. 22, No. 9. pp. 1811-1823.
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