Profiling of core fucosylated N-glycans using a novel bacterial lectin that specifically recognizes [alpha]1,6 fucosylated chitobiose

A novel fucose-binding lectin (SL2-1) from the bacterium Streptomyces rapamycinicus was identified by analysis of metagenomic DNA sequences. SL2-1 belongs to a new group of bacterial fucose-specific lectins that have no similarity to known bacterial fucose-binding proteins, but are related to certai...

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Bibliographic Details
Published in:Scientific reports 2016-09, Vol.6, p.34195
Main Authors: Vainauskas, Saulius, Duke, Rebecca M, Mcfarland, James, Mcclung, Colleen, Ruse, Cristian, Taron, Christopher H
Format: Article
Language:English
Subjects:
Affinity
Affinity chromatography
DNA microarrays
Enzyme-linked immunosorbent assay
Epitopes
Fucose
Immunoglobulin G
Lectins
N-acetylchitobiose
N-glycans
Nucleotide sequence
Oligosaccharides
Polysaccharides
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Summary:A novel fucose-binding lectin (SL2-1) from the bacterium Streptomyces rapamycinicus was identified by analysis of metagenomic DNA sequences. SL2-1 belongs to a new group of bacterial fucose-specific lectins that have no similarity to known bacterial fucose-binding proteins, but are related to certain eukaryotic fucose-binding lectins. The 17 kDa protein was expressed recombinantly in E. coli and purified by affinity chromatography. Glycan microarray analysis with fluorescently labeled recombinant SL2-1 demonstrated its ability to bind to core α1-6 fucosylated N-glycans, but not to core α1-3 fucosylated N-glycans, or other α1-2, α1-3 and α1-4 fucosylated oligosaccharides. The minimal high affinity binding epitope of SL2-1 was α1-6 fucosylated di-n-acetylchitobiose. The recombinant lectin was efficient in detection of N-glycan core fucosylation using lectin blotting and lectin ELISA assays. Finally, a workflow using SL2-1 for selective and quantitative profiling of core fucosylated N-glycans using UPLC-HILIC-FLR analysis was established. The approach was validated for selective capture and analysis of core fucosylated N-glycans present in complex glycan mixtures derived from mammalian serum IgG.
ISSN:2045-2322
DOI:10.1038/srep34195