Selective Glycan Labeling of Mannose-Containing Glycolipids in Mycobacteria
Name
nihms-1968452.pdf
Description
Accepted version
Size
1.41 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Lee, So Young
Marando, Victoria M
Smelyansky, Stephanie R
Kim, Daria E
Calabretta, Phillip J
Warner, Theodore C
Bryson, Bryan D
Kiessling, Laura L
Date Issued
December 19, 2023
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society
Citation
So Young Lee, Victoria M. Marando, Stephanie R. Smelyansky, Daria E. Kim, Phillip J. Calabretta, Theodore C. Warner, Bryan D. Bryson, Laura L. Kiessling; Selective Glycan Labeling of Mannose-Containing Glycolipids in Mycobacteria. Journal American Chemical Society 10 January 2024; 146 (1): 377–385.
Version
Author's final manuscript
Abstract
Mycobacterium tuberculosis (Mtb) is one of history’s most successful human pathogens. By subverting typical immune responses, Mtb can persist within a host until conditions become favorable for growth and proliferation. Virulence factors that enable mycobacteria to modulate host immune systems include a suite of mannose-containing glycolipids: phosphatidylinositol mannosides, lipomannan, and lipoarabinomannan (LAM). Despite their importance, tools for their covalent capture, modification, and imaging are limited. Here, we describe a chemical biology strategy to detect and visualize these glycans. Our approach, biosynthetic incorporation, is to synthesize a lipid-glycan precursor that can be incorporated at a late-stage step in glycolipid biosynthesis. We previously demonstrated selective mycobacterial arabinan modification by biosynthetic incorporation using an exogenous donor. This report reveals that biosynthetic labeling is general and selective: it allows for cell surface mannose-containing glycolipid modification without nonspecific labeling of mannosylated glycoproteins. Specifically, we employed azido-(Z,Z)-farnesyl phosphoryl-β-d-mannose probes and took advantage of the strain-promoted azide–alkyne cycloaddition to label and directly visualize the localization and dynamics of mycobacterial mannose-containing glycolipids. Our studies highlight the generality and utility of biosynthetic incorporation as the probe structure directs the selective labeling of distinct glycans. The disclosed agents allowed for direct tracking of the target immunomodulatory glycolipid dynamics in cellulo. We anticipate that these probes will facilitate investigating the diverse biological roles of these glycans.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1021/jacs.3c09495
