4I6S image
Deposition Date 2012-11-30
Release Date 2013-07-31
Last Version Date 2023-11-08
Entry Detail
PDB ID:
4I6S
Title:
Structure of RSL mutant W76A in complex with L-fucose
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.54 Å
R-Value Free:
0.17
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
I 41 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Putative fucose-binding lectin protein
Mutations:W76A
Chain IDs:A, B, C
Chain Length:91
Number of Molecules:3
Biological Source:Ralstonia solanacearum
Primary Citation
Reduction of lectin valency drastically changes glycolipid dynamics in membranes but not surface avidity
Acs Chem.Biol. 8 1918 1924 (2013)
PMID: 23855446 DOI: 10.1021/cb400254b

Abstact

Multivalency is proposed to play a role in the strong avidity of lectins for glycosylated cell surfaces and also in their ability to affect membrane dynamics by clustering glycosphingolipids. Lectins with modified valency were designed from the β-propeller fold of Ralstonia solanacearum lectin (RSL) that presents six fucose binding sites. After identification of key amino acids by molecular dynamics calculations, two mutants with reduced valency were produced. Isothermal titration calorimetry confirmed the loss of three high affinity binding sites for both mutants. Crystal structures indicated that residual low affinity binding occurred in W76A but not in R17A. The trivalent R17A mutant presented unchanged avidity toward fucosylated surfaces, when compared to hexavalent RSL. However, R17A is not able anymore to induce formation of membrane invaginations on giant unilamellar vesicules, indicating the crucial role of number of binding sites for clustering of glycolipids. In the human lung epithelial cell line H1299, wt-RSL is internalized within seconds whereas the kinetics of R17A uptake is largely delayed. Neolectins with tailored valency are promising tools to study membrane dynamics.

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