4YW7

Structural Insight into Divalent Galactoside Binding to Pseudomonas aeruginosa lectin LecA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

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Literature

Structural Insight into Multivalent Galactoside Binding to Pseudomonas aeruginosa Lectin LecA.

Visini, R., Jin, X., Bergmann, M., Michaud, G., Pertici, F., Fu, O., Pukin, A., Branson, T.R., Thies-Weesie, D.M., Kemmink, J., Gillon, E., Imberty, A., Stocker, A., Darbre, T., Pieters, R.J., Reymond, J.L.

(2015) ACS Chem Biol 10: 2455-2462

  • DOI: 10.1021/acschembio.5b00302
  • Primary Citation of Related Structures:  
    4YW6, 4YW7, 4YWA

  • PubMed Abstract: 

    • Multivalent galactosides inhibiting Pseudomonas aeruginosa biofilms may help control this problematic pathogen. To understand the binding mode of tetravalent glycopeptide dendrimer GalAG2 [(Gal-β-OC6H4CO-Lys-Pro-Leu)4(Lys-Phe-Lys-Ile)2Lys-His-Ile-NH2] to its target lectin LecA, crystal structures of LecA complexes with divalent analog GalAG1 [(Gal-β-OC6H4CO-Lys-Pro-Leu)2Lys-Phe-Lys-Ile-NH2] and related glucose-triazole linked bis-galactosides 3u3 [Gal-β-O(CH2)n-(C2HN3)-4-Glc-β-(C2HN3)-[β-Glc-4-(N3HC2)]2-(CH2)n-O-β-Gal (n = 1)] and 5u3 (n = 3) were obtained, revealing a chelate bound 3u3, cross-linked 5u3, and monovalently bound GalAG1 ...

    Multivalent galactosides inhibiting Pseudomonas aeruginosa biofilms may help control this problematic pathogen. To understand the binding mode of tetravalent glycopeptide dendrimer GalAG2 [(Gal-β-OC6H4CO-Lys-Pro-Leu)4(Lys-Phe-Lys-Ile)2Lys-His-Ile-NH2] to its target lectin LecA, crystal structures of LecA complexes with divalent analog GalAG1 [(Gal-β-OC6H4CO-Lys-Pro-Leu)2Lys-Phe-Lys-Ile-NH2] and related glucose-triazole linked bis-galactosides 3u3 [Gal-β-O(CH2)n-(C2HN3)-4-Glc-β-(C2HN3)-[β-Glc-4-(N3HC2)]2-(CH2)n-O-β-Gal (n = 1)] and 5u3 (n = 3) were obtained, revealing a chelate bound 3u3, cross-linked 5u3, and monovalently bound GalAG1. Nevertheless, a chelate bound model better explaining their strong LecA binding and the absence of lectin aggregation was obtained by modeling for all three ligands. A model of the chelate bound GalAG2·LecA complex was also obtained rationalizing its unusually tight LecA binding (KD = 2.5 nM) and aggregation by lectin cross-linking. The very weak biofilm inhibition with divalent LecA inhibitors suggests that lectin aggregation is necessary for biofilm inhibition by GalAG2, pointing to multivalent glycoclusters as a unique opportunity to control P. aeruginosa biofilms.

    Organizational Affiliation: 

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



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PA-I galactophilic lectin
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
121Pseudomonas aeruginosaMutation(s): 0 
Gene Names: lecA, pa1L, PA2570
UniProt
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
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
4J0 (Subject of Investigation/LOI)
Query on 4J0
Download Ideal Coordinates CCD File 
HA [auth I], U [auth C](2R,3R,4S,5R,6R,2'R,3'R,4'S,5'R,6'R)-2,2'-([(2R,3R,4S,5S,6S)-3,4-dihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2,5-diyl]bis{1H-1,2,3-triazole-1,4-diyl[(2S,3R,4S,5S,6S)-3,4-dihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2,5-diyl]-1H-1,2,3-triazole-1,4-diylpropane-3,1-diyloxy})bis[6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol]
C44 H68 N12 O24
LHMBJXKVNLAJJD-QFAUSYGLSA-N		 Ligand Interaction
GAL (Subject of Investigation/LOI)
Query on GAL
Download Ideal Coordinates CCD File 
BA [auth F] , DA [auth G] , FA [auth H] , JA [auth J] , LA [auth K] , NA [auth L] , QA [auth N] , R [auth A] , 
BA [auth F], DA [auth G], FA [auth H], JA [auth J], LA [auth K], NA [auth L], QA [auth N], R [auth A], SA [auth O], T [auth B], X [auth D], Z [auth E]
beta-D-galactopyranose
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
AA [auth F] , CA [auth G] , EA [auth H] , GA [auth I] , IA [auth J] , KA [auth K] , MA [auth L] , OA [auth M] , 
AA [auth F], CA [auth G], EA [auth H], GA [auth I], IA [auth J], KA [auth K], MA [auth L], OA [auth M], PA [auth N], Q [auth A], RA [auth O], S [auth B], TA [auth P], V [auth C], W [auth D], Y [auth E]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
4J0 Binding MOAD:  4YW7 Kd: 130 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.57α = 90.04
b = 89.31β = 89.83
c = 100.01γ = 79.61
Software Package:
Software NamePurpose
SCALAdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-09
    Type: Initial release
  • Version 1.1: 2015-12-02
    Changes: Database references
  • Version 2.0: 2019-12-11
    Changes: Advisory, Atomic model, Data collection, Derived calculations
  • Version 2.1: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary