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Polymorphisms in human langerin affect stability and sugar binding activity.

Eliot M Ward¹, Nicola S Stambach, Kurt Drickamer

¹Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom.

The Journal of Biological Chemistry

|March 29, 2006

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Genetic variations in langerin, a skin cell protein, affect its ability to bind sugars. This may influence how effectively the immune system recognizes pathogens, potentially impacting infection susceptibility.

Area of Science:

Immunology
Cell Biology
Genetics

Background:

Langerhans cells are crucial skin immune cells presenting antigens.
Langerin, a C-type lectin on Langerhans cells, internalizes into Birbeck granules.
Langerin binds and degrades mannose-containing glycoconjugates.

Purpose of the Study:

To investigate the functional impact of genetic variations in human langerin.
To determine how single nucleotide polymorphisms affect langerin's sugar-binding affinity and stability.

Main Methods:

Expression of full-length langerin haplotypes in fibroblasts.
Sugar binding assays and differential scanning calorimetry on extracellular domain fragments.
Analysis of a specific mutation (W264R) associated with absent Birbeck granules.

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Main Results:

All common langerin haplotypes mediated ligand endocytosis.
Two amino acid changes reduced mannose-binding affinity and extracellular domain stability.
The W264R mutation abolished langerin's sugar binding activity.

Conclusions:

Langerin haplotypes exhibit functional differences in sugar binding and stability.
Altered langerin function may affect pathogen recognition by skin immune cells.
Specific langerin variants could be associated with varying susceptibility to infections.