PuSH - Publication Server of Helmholtz Zentrum München: Structure-based optimization of the terminal tripeptide in glycopeptide dendrimer inhibitors of <em>Pseudomonas aeruginosa</em> biofilms targeting LecA.

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

Structure-based optimization of the terminal tripeptide in glycopeptide dendrimer inhibitors of Pseudomonas aeruginosa biofilms targeting LecA.

Chem. Eur. J. 19, 17054-17063 (2013)

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Open Access Green as soon as Postprint is submitted to ZB.

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The galactopeptide dendrimer GalAG2 ((-Gal-OC6H4CO-Lys-Pro-Leu)(4)(Lys-Phe-Lys-Ile)(2)Lys-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)=2.7M) and GalA-KRL (K-D=2.7M), 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 ((-Gal-OC6H4CO-Lys-Pro-Tyr)(4)(Lys-Phe-Lys-Ile)(2)Lys-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.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Biofilms ; Dendrimers ; Glycopeptides ; Inhibition ; Proteins; Lectin Pa-iil ; High-affinity ; Bacterial Lectin ; Microtiter Plates ; Tetrazolium Salt ; Accurate Docking ; Cystic-fibrosis ; Binding ; Ligands ; Glycoclusters

ISSN (print) / ISBN 0947-6539

e-ISSN 1521-3765

Journal Chemistry - A European Journal

Quellenangaben Volume: 19, Issue: 50, Pages: 17054-17063

Publisher Wiley

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Structural Biology (STB)