Crystal Structure of Pseudomonas aeruginosa Lectin LecA Complexed with GalA-WKY at 1.64 A Resolution

Experimental Data Snapshot

  • Resolution: 1.64 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

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Structure-Based Optimization of the Terminal Tripeptide in Glycopeptide Dendrimer Inhibitors of Pseudomonas aeruginosa Biofilms Targeting LecA.

Kadam, R.U.Bergmann, M.Garg, D.Gabrieli, G.Stocker, A.Darbre, T.Reymond, J.-L.

(2013) Chemistry 19: 17054-17063

  • DOI: https://doi.org/10.1002/chem.201302587
  • Primary Citation of Related Structures:  
    4LKD, 4LKE, 4LKF

  • PubMed Abstract: 

    The galactopeptide dendrimer GalAG2 ((β-Gal-OC6H4CO-Lys-Pro-Leu)4(Lys-Phe-Lys-Ile)2Lys-His-Ile-NH2) binds strongly to the Pseudomonas aeruginosa (PA) lectin LecA, and it inhibits PA biofilms, as well as disperses already established ones. By starting with the crystal structure of the terminal tripeptide moiety GalA-KPL in complex with LecA, a computational mutagenesis study was carried out on the galactotripeptide to optimize the peptide-lectin interactions. 25 mutants were experimentally evaluated by a hemagglutination inhibition assay, 17 by isothermal titration calorimetry, and 3 by X-ray crystallography. Two of these tripeptides, GalA-KPY (dissociation constant (K(D))=2.7 μM) and GalA-KRL (K(D)=2.7 μM), are among the most potent monovalent LecA ligands reported to date. Dendrimers based on these tripeptide ligands showed improved PA biofilm inhibition and dispersal compared to those of GalAG2, particularly G2KPY ((β-Gal-OC6H4CO-Lys-Pro-Tyr)4(Lys-Phe-Lys-Ile)2Lys-His-Ile-NH2). The possibility to retain and even improve the biofilm inhibition in several analogues of GalAG2 suggests that it should be possible to fine-tune this dendrimer towards therapeutic use by adjusting the pharmacokinetic parameters in addition to the biofilm inhibition through amino acid substitutions.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne (Switzerland), Fax: (+41) 31-631-80-57.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PA-I galactophilic lectin
A, B
121Pseudomonas aeruginosaMutation(s): 0 
Gene Names: lecA pa1L PA2570
Find proteins for Q05097 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q05097 
Go to UniProtKB:  Q05097
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ05097
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
peptide WKYL
C, D
4N/AMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.64 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: P 43 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.4α = 90
b = 95.4β = 90
c = 107.361γ = 90
Software Package:
Software NamePurpose
SLSPSIdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-12-18
    Type: Initial release
  • Version 1.1: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Derived calculations, Structure summary