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Method for Identifying Galectin Ligands on Lymphocyte Membrane Glycoproteins
Kashyap R Patel1,2, Adam W Barb3,4, Sean R Stowell5,6
1Joint Program in Transfusion Medicine, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
Methods in Molecular Biology (Clifton, N.J.)
|March 23, 2022
Summary
This study identifies galectin-binding glycans on human lymphocyte receptors. The findings enable site-specific analysis of these crucial interactions in healthy individuals.
Area of Science:
- Glycobiology
- Immunology
- Molecular Biology
Background:
- Protein glycosylation is a common post-translational modification.
- Galectins, glycan-binding proteins, modulate lymphocyte function.
- Site-specific glycan analysis on lymphocyte receptors is challenging due to limited material and heterogeneity.
Purpose of the Study:
- To develop a method for identifying galectin ligands at specific glycosylation sites on primary human lymphocyte membrane receptors.
- To investigate the site-specific glycan composition of CD16a on NK cells.
Main Methods:
- Isolation of CD16a from primary NK cells of healthy donors.
- Analysis of N-glycan structures at specific glycosylation sites.
- Identification of N-glycans serving as ligands for galectins.
Main Results:
- Donor-dependent variability in N-glycan structures on CD16a was observed.
- Two of five N-glycosylation sites on CD16a are modified by N-glycans with multiple N-acetyllactosamine (LacNAc) repeats.
- These LacNAc-rich glycans serve as ligands for endogenous galectins.
Conclusions:
- The described protocol allows for the identification of galectin ligands at specific glycosylation sites on endogenous membrane receptors from circulating human lymphocytes.
- This advancement facilitates a deeper understanding of galectin-glycan interactions in lymphocyte biology.
