Cited by 6Carbohydrate Chemistry and SynthesisImmune Response and InflammationGlycosylation and Glycoproteins Research

Self and Nonself Recognition with Bacterial and Animal Glycans, Surveys by Synthetic Chemistry

Yukari Fujimoto, Katsunori Tanaka, Atsushi Shimoyama, Koichi Fukase·2010·Methods in Enzymology

Abstract

In this chapter, we describe synthetic studies on partial structures of lipopolysaccharide (LPS) and peptidoglycan (PGN), which work as tags for nonself recognition in innate immune system. Our previous studies demonstrated that lipid A is the endotoxic principle of LPS. The synthetic homogeneous preparations have enabled not only precise structure-activity relationships, but also recognition mechanisms of LPS with innate immune receptor complexes, including the TLR4/MD-2 complex, to be studied. Synthetic studies of lipid A and Kdo-lipid A from parasitic Helicobacter pylori revealed their low inflammatory activities, suggesting the molecular evolution to escape from the host immune system. A synthetic study of the partial structures of PGN has also contributed to the understanding of the innate immune mechanism. The biological activities of the synthetic fragments have revealed that the intracellular receptor Nod2 recognizes partial structures containing the muramyl dipeptide (MDP) moiety. The PGN of Gram-negative bacteria and some Gram-positive bacteria contain meso-diaminopimelic acid (meso-DAP), and recent studies have revealed that the intracellular receptor Nod1 recognizes DAP-containing peptides. We have synthesized DAP-containing PGN fragments, including the first chemical synthesis of tracheal cytotoxin (TCT). The ability of these fragments to stimulate human Nod1 as well as differences in Nod1 recognition for various synthesized ligand structures was elucidated. Cell-surface glycans such as N-glycans and O-glycans on glycoproteins and glycoconjugates work as signaling molecules for self-recognition and control immune system. Our new strategy using glycan-imaging in whole-body system is expected to unveil the dynamics of glycans in the body. Positron emission tomography (PET) is a noninvasive method that visualizes the locations and levels of radiotracer accumulation. We developed the facile labeling of peptides and proteins for PET imaging. The labeled glycoproteins and glycoclusters were then subjected to PET imaging in order to examine their in vivo dynamics, visualizing the differences in the circulatory residence of glycoproteins and glycoclusters in the presence or absence of sialic acid residues.

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Crossref · 10.1016/s0076-6879(10)78016-2

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Authors
Fujimoto, Y., Tanaka, K., Shimoyama, A., & Fukase, K.
Affiliations
The University of Osaka (JP)
Venue
Methods in Enzymology
Publisher
Elsevier
Published
2010
Volume
478
Pages
323-342
ISSN
0076-6879 (ISSN-L)
OpenAlex
W1512774023
Cited by
6
References
35
Citations by year
2021: 1 · 2016: 2 · 2013: 1 · 2012: 2
FWCI
5.52
Type
book chapter
Language
en
Open access
closed
Locations
  • Methods in enzymology on CD-ROM/Methods in enzymology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Chemistry › Organic Chemistry › Carbohydrate Chemistry and Synthesis
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
Keywords
self/non-self recognition, innate immunity, lipopolysaccharide, peptidoglycan, lipid A, Helicobacter pylori, TLR4/MD-2 complex, NOD2, muramyl dipeptide, NOD1, meso-diaminopimelic acid, tracheal cytotoxin, cell surface glycans, N-glycans, O-glycans, glycan imaging, positron emission tomography, sialic acid, glycoconjugates
MeSH terms
Animals, Bacteria, Carbohydrate Sequence, Gram-Negative Bacteria, Humans, Immunity, Innate, Lipopolysaccharides, Molecular Sequence Data, Peptidoglycan, Polysaccharides, Toll-Like Receptor 4, Host-Pathogen Interactions

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