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Soluble Human Intestinal Lactoferrin Receptor: Ca(2+)-Dependent Binding to Sepharose-Based Matrices.
Yuta Oshima1, Kohei Seki, Masataka Shibuya
1School of Bioscience and Biotechnology, Tokyo University of Technology.
Biological & Pharmaceutical Bulletin
|March 4, 2016
Summary
Human intelectin-1 (hITLN-1), also known as soluble lactoferrin receptor, binds to Sepharose matrices via calcium-dependent interactions with galactose structures. This binding mechanism is crucial for its host defense function against pathogens.
Area of Science:
- Biochemistry
- Immunology
- Molecular Biology
Background:
- Soluble human intestinal lactoferrin receptor (shLFR) is identical to human intelectin-1 (hITLN-1).
- Human intelectin-1 (hITLN-1) is a lectin involved in host defense against pathogens.
- hITLN-1 exhibits galactofuranose-binding properties.
Purpose of the Study:
- To investigate the binding characteristics of recombinant shLFR (hITLN-1).
- To determine the molecular basis of shLFR (hITLN-1) binding to Sepharose matrices.
- To elucidate the role of calcium ions and specific sugars in this interaction.
Main Methods:
- Recombinant shLFR was expressed in mammalian cells (CHO DG44, COS-1, RK13).
- Binding assays were performed using Sepharose 4 Fast Flow (FF)-based matrices.
- Inhibition studies were conducted using D-galactose and D-glucose.
- Binding to different Sepharose matrices (4B, 6B) was also assessed.
Main Results:
- Recombinant shLFR (hITLN-1) demonstrated Ca(2+)-dependent binding to Sepharose 4 FF matrices.
- Binding was inhibited by D-galactose, indicating recognition of α-1,6-linked D-galactose units.
- shLFR (hITLN-1) also bound to non-crosslinked Sepharose 4B and 6B matrices.
- The binding is Ca(2+)-dependent and specific for galactose-containing structures.
Conclusions:
- shLFR (hITLN-1) binds to Sepharose-based matrices in a Ca(2+)-dependent manner.
- This binding is mediated by the recognition of repeating galactose units (agarobiose-like structures).
- This interaction mechanism is likely relevant to hITLN-1's function as a host defense lectin against microorganisms.
