5T7S

Crystal structure of galectin-8N in complex with Lactose

Summary for 5T7S

• Entry DOI: 10.2210/pdb5t7s/pdb
• Related: 5T7I 5T7T 5T7U
• Related PRD ID: PRD_900008
• Descriptor: Galectin-8, beta-D-galactopyranose-(1-4)-alpha-D-glucopyranose, GLYCEROL, ... (4 entities in total)
• Functional Keywords: carbohydrate-binding protein, galectin-8 lectin, sugar binding protein
• Biological source: Homo sapiens (Human)
• Cellular location: Cytoplasm : O00214
• Total number of polymer chains: 1
• Total formula weight: 18020.71

Authors

Bohari, M.H.,Yu, X.,Blanchard, H. (deposition date: 2016-09-05, release date: 2017-01-04, Last modification date: 2024-10-23)

Primary citation

Bohari, M.H.,Yu, X.,Zick, Y.,Blanchard, H.
Structure-based rationale for differential recognition of lacto- and neolacto- series glycosphingolipids by the N-terminal domain of human galectin-8.
Sci Rep, 6:39556-39556, 2016

PubMed Abstract: Glycosphingolipids are ubiquitous cell surface molecules undertaking fundamental cellular processes. Lacto-N-tetraose (LNT) and lacto-N-neotetraose (LNnT) are the representative core structures for lacto- and neolacto-series glycosphingolipids. These glycolipids are the carriers to the blood group antigen and human natural killer antigens mainly found on blood cells, and are also principal components in human milk, contributing to infant health. The β-galactoside recognising galectins mediate various cellular functions of these glycosphingolipids. We report crystallographic structures of the galectin-8 N-terminal domain (galectin-8N) in complex with LNT and LNnT. We reveal the first example in which the non-reducing end of LNT binds to the primary binding site of a galectin, and provide a structure-based rationale for the significant ten-fold difference in binding affinities of galectin-8N toward LNT compared to LNnT, such a magnitude of difference not being observed for any other galectin. In addition, the LNnT complex showed that the unique Arg59 has ability to adopt a new orientation, and comparison of glycerol- and lactose-bound galectin-8N structures reveals a minimum atomic framework for ligand recognition. Overall, these results enhance our understanding of glycosphingolipids interactions with galectin-8N, and highlight a structure-based rationale for its significantly different affinity for components of biologically relevant glycosphingolipids.

PubMed: 28000747
DOI: 10.1038/srep39556

Experimental method

X-RAY DIFFRACTION (1.9 Å)