Glycan‑Binding Protein Profiling

High‑Throughput Glycan‑Binding Protein Profiling – Specificity, Affinity & Epitope Mapping

You are searching for glycan‑binding protein detection because you need to perform this assay—whether to characterise lectin specificity, validate antibody recognition of glycan epitopes, screen for novel carbohydrate‑binding modules (CBMs), or assess quality control of glycoprotein therapeutics. We deliver a complete detection service that integrates glycan microarrays, surface plasmon resonance (SPR), frontal affinity chromatography (FAC), and high‑resolution MS‑based binding assays to provide unambiguous ligand identification, affinity ranking, and cross‑reactivity profiling for any glycan‑binding protein (GBP).

What We Detect – From Single Glycan Specificity to Whole‑Glycome Fingerprints

Our glycan‑binding protein detection goes far from simple ELISA with a few immobilised sugars. Using commercially available and custom‑printed glycan microarrays (up to 600 natural and synthetic glycans per slide, including N‑glycans, O‑glycans, glycolipids, polysaccharides, and neoglycoconjugates), we measure binding intensity (RFU) for each glycan with Z‑factor >0.7 and intra‑slide CV <12%. For quantitative specificity ranking, we determine half‑maximal effective concentration (EC₅₀) or apparent K_d for up to 30 glycan targets per protein using serial dilution SPR (Biacore™ 8K) – achieving sensitivity down to 0.1 nM GBP and measurement of fast on‑/off‑rates (k_a 10²‑10⁷ M⁻¹s⁻¹, k_d 10⁻⁵‑1 s⁻¹). For low‑abundance or native GBPs (e.g., cell surface lectins), we perform frontal affinity chromatography (FAC) with fluorescently labelled glycans to determine K_d values in the µM‑mM range – the physiologically relevant regime for many carbohydrate‑protein interactions. We also offer glycan‑binding ELISA (lectin‑based or antibody‑based) with 30+ immobilised glycoconjugates for rapid screening of serum, hybridoma supernatants, or purified proteins.

How Deep We Go – Epitope Fine Mapping, Multivalency Effect & Glycoform Selectivity

We don't just report “binds to mannose”. Our advanced pipeline includes fine epitope mapping using a panel of 80+ structurally defined glycan fragments (mono‑ to pentasaccharides, sulfated/fucosylated/sialylated variants) to pinpoint the minimal recognition motif and tolerance to modifications. For multivalent GBPs (e.g., lectin tetramers, DC‑SIGN), we measure avidity vs. intrinsic affinity by comparing monovalent (glycan‑immobilised at low density) and multivalent (high density) SPR surfaces, calculating cooperativity factor (α). For glycoform selectivity, we test binding to glycoproteins with defined N‑glycan structures (e.g., RNase B (Man5‑9GlcNAc2), asialofetuin, transferrin variants) and perform LC‑MS/MS glycomics on the bound fraction – identifying which specific glycan isomers are recognised. We also offer cell‑surface glycan binding assays (flow cytometry using glycan‑coated fluorescent beads or biotinylated glycans on live cells) to assess GBP recognition in a native membrane context. For discovery projects, we perform glycan array screening of crude biological samples (cell lysates, serum, lavage fluid) to identify endogenous GBP activities – including competitive inhibition with free glycans (IC₅₀ determination) and heat/chemical inactivation controls.

Why Our Glycan‑Binding protein detection Stands Out – High Density Glycan Libraries, Orthogonal Validation & Physiological Relevance

1. Extensive glycan coverage: We maintain >600 unique glycans (>95% chemically defined, >300 mammalian, >200 microbial/pathogen, >100 plant/structural). Custom printing with your glycans (as low as 20 µg per glycan) available.
2. Multi‑platform cross‑validation: We always confirm array hits by SPR (affinity & kinetics) and FAC (weak binding) – eliminating false positives from non‑specific adsorption or avidity artefacts. For ambiguous results, we use competitive binding with free glycans (IC₅₀) and isothermal titration calorimetry (ITC) for thermodynamic validation.
3. Ultra‑low protein consumption: Complete glycan array profiling requires only 10‑50 µg of purified GBP (labelled with fluorophore or His‑tag for detection). SPR kinetic studies use 2‑5 µg per ligand.
4. Pathogen & immune relevance: We specialise in GBPs from viral (influenza HA, SARS‑CoV‑2 spike), bacterial (fimbrial lectins, toxins), fungal, and human immune system (DC‑SIGN, langerin, galectins, siglecs, C‑type lectins) – with validated positive controls for each class.
5. Reporting & support: You receive heatmaps of glycan binding (colour‑coded by intensity), SPR sensorgrams with fitted curves, K_d and EC₅₀ tables, epitope structure diagrams, and full raw data (GPR files, SPR trace files). Reports support manuscripts, patent applications, and biologic license filings. Turnaround: glycan array: 5‑7 days; SPR kinetics: 3‑5 days per target; full package: 2‑3 weeks.

Who Relies on Our Glycan‑Binding protein detection – Real‑World Impact

A vaccine developer studying a novel lectin‑based antigen capture system used our glycan array and SPR to confirm that their engineered lectin bound specifically to high‑mannose N‑glycans (Man9, Man8) with K_d = 23 nM but not to complex or hybrid types – critical for antigen enrichment. A diagnostics company developing a galectin‑3 rapid test relied on our fine epitope mapping to identify the minimum binding motif as LacNAc (Galβ1‑4GlcNAc) with 4‑O‑sulfation enhancing affinity 10‑fold. An academic group studying SARS‑CoV‑2 spike binding to host lectins sent us recombinant spike protein and DC‑SIGN; we performed competition assays with 80 glycans and identified a fucosylated high‑mannose glycan that blocks interaction (IC₅₀ = 2.1 µM). A therapeutic antibody manufacturer needed to characterise a glycan‑specific antibody (anti‑Tn antigen) – our array revealed strong binding to Tn (GalNAcα‑Ser/Thr) and weak cross‑reactivity to sialyl‑Tn, enabling clone selection.

Ready to Run Your Glycan‑Binding protein detection?

Send us purified GBP (≥20 µg for array + SPR, ≥5 µg for array only), GBP‑containing supernatants (≥1 mL, if concentration unknown), or biotinylated/His‑tagged preparations. We will perform glycan microarray screening, SPR kinetic/affinity analysis, epitope fine mapping, and full data interpretation – delivering a comprehensive report within 5‑15 business days. Request a free consultation; we will design the optimal glycan panel (custom or pre‑defined) and binding assay cascade (screening → affinity → fine mapping) for your lectin, antibody, or carbohydrate‑binding protein of interest.