4AL9

Crystal structure of the lectin PA-IL from Pseudomonas aeruginoas in complex with melibiose

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

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Literature

Secondary Sugar Binding Site Identified for Leca Lectin from Pseudomonas Aeruginosa.

Blanchard, B., Imberty, A., Varrot, A.

(2014) Proteins 82: 1060

  • DOI: 10.1002/prot.24430
  • Primary Citation of Related Structures:  
    4AL9

  • PubMed Abstract: 

    • The galactose-specific lectin LecA from Pseudomonas aeruginosa is a target for the development of new anti-infectious compounds. Sugar based molecules with anti-adhesive properties present great potential in the fight against bacterial infection and ...

    The galactose-specific lectin LecA from Pseudomonas aeruginosa is a target for the development of new anti-infectious compounds. Sugar based molecules with anti-adhesive properties present great potential in the fight against bacterial infection and biofilm formation. LecA is specific for oligosaccharides with terminal α-galactoside residues and displays strong affinity for melibiose (αGal1-6Glc) with a Kd of 38.8 µM. The crystal structure of LecA/melibiose complex shows classical calcium-bridged binding of αGal in the primary binding site but also revealed a secondary sugar binding site with glucose bound. This sugar binding site is in close proximity to the galactose binding one, is independent of calcium and mainly involves interactions with a symmetry-related protein. This discovery would help to the design of new potent inhibitors targeting both binding sites.

    Organizational Affiliation: 

    CERMAV-CNRS, Université de Grenoble and Member of ICMG, BP 53, 38041 Grenoble Cedex 9, France.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PA-I GALACTOPHILIC LECTINA, B, C, D, E, F, G, H121Pseudomonas aeruginosa PAO1Mutation(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
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
alpha-D-galactopyranose-(1-6)-alpha-D-glucopyranose
I, J
2 N/A Oligosaccharides Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900037
Query on PRD_900037		I, Jalpha-melibioseOligosaccharide /  Metabolism

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.07α = 101.13
b = 58.13β = 92.89
c = 75.94γ = 100.98
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-20
    Type: Initial release
  • Version 1.1: 2013-10-30
    Changes: Database references
  • Version 1.2: 2014-05-28
    Changes: Database references
  • Version 1.3: 2015-09-16
    Changes: Structure summary
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary