TETRALEC, Artificial Tetrameric Lectins: A Tool to Screen Ligand and Pathogen Interactions

Area of Science:

• Immunology
• Glycobiology
• Biochemistry

Background:

• C-type lectin receptors (CLRs) mediate low-affinity interactions with carbohydrates.
• Multivalent display of CLR carbohydrate recognition domains (CRDs) compensates for low-affinity binding.
• In vitro mimicry of these interactions is crucial for understanding CLR/glycan binding.

Purpose of the Study:

• To develop a generic tetrameric construct (TETRALEC) for CLR CRDs.
• To compare the ligand-binding capacity of a DC-SIGNR TETRALEC construct with other forms.
• To explore the utility of TETRALEC in studying CLR/pathogen interactions.

Main Methods:

• Developed a generic TETRALEC construct for tetrameric CRD presentation.
• Applied the strategy to DC-SIGNR and compared binding using glycan microarrays.
• Utilized flow cytometry and confocal microscopy to assess CLR/pathogen interactions.

Main Results:

• The DC-SIGNR TETRALEC construct exhibited similar binding to its natural tetrameric counterpart.
• Differences in low-affinity ligand recognition highlighted the importance of CRD spatial arrangement.
• DC-SIGNR TETRALEC successfully recognized heat-killed Candida albicans, indicating a novel specificity.

Conclusions:

• The TETRALEC tool is effective for creating generic tetrameric CLR CRD constructs.
• CRD spatial arrangement significantly influences the recognition of low-affinity ligands.
• TETRALEC facilitates the discovery of novel CLR/glycan and CLR/pathogen interactions.