Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 53.07 kDa 
• Atom Count: 4368 
• Residue Count: 484 
• Unique protein chains: 1

4LJH

Crystal Structure of Pseudomonas aeruginosa Lectin LecA Complexed with 1-Methyl-3-indolyl-b-D-galactopyranoside at 1.45 A Resolution

• DOI: 10.2210/pdb4LJH/pdb

• Classification: SUGAR BINDING PROTEIN
• Organism(s): Pseudomonas aeruginosa PAO1
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-07-04 Released: 2013-10-30 
• Deposition Author(s): Kadam, R.U., Stocker, A., Reymond, J.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.45 Å
• R-Value Free: 0.211 
• R-Value Work: 0.190 
• R-Value Observed: 0.191 

Literature

CH-pi "T-Shape" Interaction with Histidine Explains Binding of Aromatic Galactosides to Pseudomonas aeruginosa Lectin LecA

Kadam, R.U., Garg, D., Schwartz, J., Visini, R., Sattler, M., Stocker, A., Darbre, T., Reymond, J.L.

(2013) ACS Chem Biol 8: 1925-1930

• PubMed: 23869965 
• DOI: 10.1021/cb400303w
• Primary Citation of Related Structures:  
  4LJH, 4LK6, 4LK7


• PubMed Abstract: 
  

The galactose specific lectin LecA mediates biofilm formation in the opportunistic pathogen P. aeruginosa . The interaction between LecA and aromatic β-galactoside biofilm inhibitors involves an intermolecular CH-π T-shape interaction between C(ε1)-H of residue His50 in LecA and the aromatic ring of the galactoside aglycone. The generality of this interaction was tested in a diverse family of β-galactosides. LecA binding to aromatic β-galactosides (KD ∼ 8 μM) was consistently stronger than to aliphatic β-galactosides (KD ∼ 36 μM). The CH-π interaction was observed in the X-ray crystal structures of six different LecA complexes, with shorter than the van der Waals distances indicating productive binding. Related XH/cation/π-π interactions involving other residues were identified in complexes of aromatic glycosides with a variety of carbohydrate binding proteins such as concanavalin A. Exploiting such interactions might be generally useful in drug design against these targets.

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Organizational Affiliation: 

Department of Chemistry and Biochemistry, University of Berne , Freiestrasse 3, 3012 Berne, Switzerland.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PA-I galactophilic lectin	A, B, C, D	122	Pseudomonas aeruginosa PAO1	Mutation(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

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GAL	A, B, C, D	beta-D-galactopyranose C6 H12 O6 WQZGKKKJIJFFOK-FPRJBGLDSA-N
MHD	A, B, C, D	1-methyl-1H-indol-3-ol C9 H9 N O CGLJIJABFUYKIL-UHFFFAOYSA-N
CA	A, B, C, D	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.45 Å
• R-Value Free: 0.211 
• R-Value Work: 0.190 
• R-Value Observed: 0.191 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.6	α = 90
b = 68.2	β = 90
c = 159.4	γ = 90

Software Package:

Software Name	Purpose
SLSPSI	data collection
PHASER	phasing
PHENIX	refinement
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-07-04 
• Released Date: 2013-10-30 
Deposition Author(s): Kadam, R.U., Stocker, A., Reymond, J.L.

Revision History 

• Version 1.0: 2013-10-30
  Type: Initial release
  
• Version 1.1: 2017-11-15
  Changes: Refinement description
• Version 1.2: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary