6Z6C image
Entry Detail
PDB ID:
6Z6C
Title:
Crystal structurel of FleA lectin in complex with a monovalent inhibitor
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2020-05-28
Release Date:
2021-04-07
Method Details:
Experimental Method:
Resolution:
1.40 Å
R-Value Free:
0.15
R-Value Work:
0.11
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Fucose-specific lectin
Chain IDs:A (auth: AAA), B (auth: BBB)
Chain Length:317
Number of Molecules:2
Biological Source:Aspergillus fumigatus Af293
Primary Citation
Hexavalent thiofucosides to probe the role of the Aspergillus fumigatus lectin FleA in fungal pathogenicity.
Org.Biomol.Chem. 19 3234 3240 (2021)
PMID: 33885578 DOI: 10.1039/d1ob00152c

Abstact

Aspergillus fumigatus is a pathogenic fungus infecting the respiratory system and responsible for a variety of life-threatening lung diseases. A fucose-binding lectin named FleA which has a controversial role in A. fumigatus pathogenesis was recently identified. New chemical probes with high affinity and enzymatic stability are needed to explore the role of FleA in the infection process. In this study, we developed potent FleA antagonists based on optimized and non-hydrolysable thiofucoside ligands. We first synthesized a set of monovalent sugars showing micromolar affinity for FleA by isothermal titration calorimetry. The most potent derivative was co-crystallized with FleA to gain insights into the binding mode in operation. Its chemical multimerization on a cyclodextrin scaffold led to an hexavalent compound with a significantly enhanced binding affinity (Kd = 223 ± 21 nM) thanks to a chelate binding mode. The compound could probe the role of bronchial epithelial cells in a FleA-mediated response to tissue invasion.

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