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Glycan Dependence of Galectin-3 Self-Association Properties

Abstract : Human Galectin-3 is found in the nucleus, the cytoplasm and at the cell surface. This lectin is constituted of two domains: an unfolded N-terminal domain and a C-terminal Carbohydrate Recognition Domain (CRD). There are still uncertainties about the relationship between the quaternary structure of Galectin-3 and its carbohydrate binding properties. Two types of self-association have been described for this lectin: a C-type self-association and a N-type self-association. Herein, we have analyzed Galectin-3 oligomerization by Dynamic Light Scattering using both the recombinant CRD and the full length lectin. Our results proved that LNnT induces N-type self-association of full length Galectin-3. Moreover, from Nuclear Magnetic Resonance (NMR) and Surface Plasmon Resonance experiments, we observed no significant specificity or affinity variations for carbohydrates related to the presence of the N-terminal domain of Galectin-3. NMR mapping clearly established that the N-terminal domain interacts with the CRD. We propose that LNnT induces a release of the N-terminal domain resulting in the glycan-dependent self-association of Galectin-3 through N-terminal domain interactions.
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Hubert Halimi, Annafrancesca Rigato, Deborah Byrne, Géraldine Ferracci, Corinne Sebban-Kreuzer, et al.. Glycan Dependence of Galectin-3 Self-Association Properties. PLoS ONE, Public Library of Science, 2014, 9 (11), pp.e111836. ⟨10.1371/journal.pone.0111836⟩. ⟨inserm-01356877⟩

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