Insights into Interactions of Mycobacteria with the Host Innate Immune System from a Novel Array of Synthetic Mycobacterial Glycans.

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Title: Insights into Interactions of Mycobacteria with the Host Innate Immune System from a Novel Array of Synthetic Mycobacterial Glycans.
Authors: Zheng, RB
Jégouzo, SAF
Joe, M
Bai, Y
Tran, H-A
Shen, K
Saupe, J
Xia, L
Ahmed, MF
Liu, Y-H
Patil, PS
Tripathi, A
Hung, S-C
Taylor, ME
Lowary, TL
Drickamer, K
Item Type: Journal Article
Abstract: An array of homogeneous glycans representing all the major carbohydrate structures present in the cell wall of the human pathogen Mycobacterium tuberculosis and other mycobacteria has been probed with a panel of glycan-binding receptors expressed on cells of the mammalian innate immune system. The results provide an overview of interactions between mycobacterial glycans and receptors that mediate uptake and survival in macrophages, dendritic cells, and sinusoidal endothelial cells. A subset of the wide variety of glycan structures present on mycobacterial surfaces interact with cells of the innate immune system through the receptors tested. Endocytic receptors, including the mannose receptor, DC-SIGN, langerin, and DC-SIGNR (L-SIGN), interact predominantly with mannose-containing caps found on the mycobacterial polysaccharide lipoarabinomannan. Some of these receptors also interact with phosphatidyl-myo-inositol mannosides and mannose-containing phenolic glycolipids. Many glycans are ligands for overlapping sets of receptors, suggesting multiple, redundant routes by which mycobacteria can enter cells. Receptors with signaling capability interact with two distinct sets of mycobacterial glycans: targets for dectin-2 overlap with ligands for the mannose-binding endocytic receptors, while mincle binds exclusively to trehalose-containing structures such as trehalose dimycolate. None of the receptors surveyed bind furanose residues, which often form part of the epitopes recognized by antibodies to mycobacteria. Thus, the innate and adaptive immune systems can target different sets of mycobacterial glycans. This array, the first of its kind, represents an important new tool for probing, at a molecular level, biological roles of a broad range of mycobacterial glycans, a task that has not previously been possible.
Issue Date: 19-Oct-2017
Date of Acceptance: 19-Oct-2017
ISSN: 1554-8929
Publisher: American Chemical Society
Start Page: 2990
End Page: 3002
Journal / Book Title: ACS Chemical Biology
Volume: 12
Issue: 12
Copyright Statement: This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Sponsor/Funder: Wellcome Trust
Biotechnology and Biological Sciences Research Council (BBSRC)
Funder's Grant Number: 093599/Z/10/Z
Keywords: 03 Chemical Sciences
06 Biological Sciences
Organic Chemistry
Publication Status: Published online
Appears in Collections:Faculty of Natural Sciences

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