5A3O

Crystal structure of the LecB lectin from Pseudomonas aeruginosa in complex with Methyl 6-(cinnamido)-6-deoxy-alpha-D-mannopyranoside at 1.6 ansgtrom


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

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This is version 1.3 of the entry. See complete history


Literature

Cinnamide Derivatives of D-Mannose as Inhibitors of the Bacterial Virulence Factor Lecb from Pseudomonas Aeruginosa

Sommer, R.Hauck, D.Varrot, A.Wagner, S.Audfray, A.Prestel, A.Moleer, H.M.Imberty, A.Titz, A.

(2015) ChemistryOpen 4: 756

  • DOI: https://doi.org/10.1002/open.201500162
  • Primary Citation of Related Structures:  
    5A3O

  • PubMed Abstract: 

    Pseudomonas aeruginosa is an opportunistic Gram-negative pathogen with high antibiotic resistance. Its lectin LecB was identified as a virulence factor and is relevant in bacterial adhesion and biofilm formation. Inhibition of LecB with carbohydrate-based ligands results in a decrease in toxicity and biofilm formation. We recently discovered two classes of potent drug-like glycomimetic inhibitors, that is, sulfonamides and cinnamides of d-mannose. Here, we describe the chemical synthesis and biochemical evaluation of more than 20 derivatives with increased potency compared to the unsubstituted cinnamide. The structure-activity relationship (SAR) obtained and the extended biophysical characterization allowed the experimental determination of the binding mode of these cinnamides with LecB. The established surface binding mode now allows future rational structure-based drug design. Importantly, all glycomimetics tested showed extended receptor residence times with half-lives in the 5-20 min range, a prerequisite for therapeutic application. Thus, the glycomimetics described here provide an excellent basis for future development of anti-infectives against this multidrug-resistant pathogen.


  • Organizational Affiliation

    Chemical Biology of Carbohydrates Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) Universitätsstrasse 1066123 Saarbrücken Germany; Department of Chemistry and Graduate School Chemical Biology University of Konstanz 78457 KonstanzGermany; Deutsches Zentrum für Infektionsforschung (DZIF) Inhoffenstraße 738124 Braunschweig Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FUCOSE-BINDING LECTIN PA-IIL
A, B, C, D
114Pseudomonas aeruginosa PAO1Mutation(s): 0 
UniProt
Find proteins for Q9HYN5 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HYN5 
Go to UniProtKB:  Q9HYN5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HYN5
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MMA
Query on MMA

Download Ideal Coordinates CCD File 
G [auth A],
L [auth B],
Q [auth C],
V [auth D]
methyl alpha-D-mannopyranoside
C7 H14 O6
HOVAGTYPODGVJG-VEIUFWFVSA-N
DH6
Query on DH6

Download Ideal Coordinates CCD File 
H [auth A],
M [auth B],
R [auth C],
W [auth D]
CINNAMIDE
C9 H9 N O
APEJMQOBVMLION-VOTSOKGWSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
J [auth B]
K [auth B]
O [auth C]
E [auth A],
F [auth A],
J [auth B],
K [auth B],
O [auth C],
P [auth C],
T [auth D],
U [auth D]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
I [auth A],
N [auth B],
S [auth C],
X [auth D]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.954α = 101.8
b = 51.111β = 99.4
c = 52.348γ = 115.95
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2016-06-29
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary
  • Version 1.3: 2024-01-10
    Changes: Data collection, Database references, Refinement description, Structure summary