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C-Terminal properties are important for ring-fused 2-pyridones that interfere with the chaperone function in uropathogenic E-coli
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2005 (English)In: Organic and biomolecular chemistry, ISSN 1477-0520, E-ISSN 1477-0539, Vol. 3, no 21, 3886-3892 p.Article in journal (Refereed) Published
Abstract [en]

Virulence-associated organelles, termed pili or fimbriae, are assembled via the highly conserved chaperone–usher pathway in a vast number of pathogenic bacteria. Substituted bicyclic 2-pyridones, pilicides, inhibit pilus formation, possibly by interfering with the active site residues Arg8 and Lys112 of chaperones in uropathogenic E. coli. In this article we describe the synthesis and evaluation of nine analogues of a biologically active pilicide. Derivatization was performed with respect to its C-terminal features and the affinities for the chaperone PapD were studied with 1H relaxation-edited NMR spectroscopy. It could be concluded that the carboxylic acid functionality and also its spatial location was important for binding. In all cases, binding was significantly reduced or even abolished when the carboxylic acid was replaced by other substituents. In addition, in vivoresults from a hemagglutination assay are presented where the derivatives have been evaluated for their ability to inhibit pilus formation in uropathogenic E. coli.

Place, publisher, year, edition, pages
London: Royal Society of Chemistry , 2005. Vol. 3, no 21, 3886-3892 p.
Keyword [en]
target pilus biogenesis, solid-phase synthesis, pathogenic bacteria, nmr-spectroscopy, structural basis, subunit recognition, papd chaperone, adhesin, protein, cycloaddition
URN: urn:nbn:se:umu:diva-13340DOI: 10.1039/b509376gOAI: diva2:153011
Available from: 2007-05-08 Created: 2007-05-08 Last updated: 2011-04-21Bibliographically approved
In thesis
1. Peptidomimetics based on ring-fused 2-pyridones: probing pilicide function in uropathogenic E. coli and identification of Aβ-peptide aggregation inhibitors
Open this publication in new window or tab >>Peptidomimetics based on ring-fused 2-pyridones: probing pilicide function in uropathogenic E. coli and identification of Aβ-peptide aggregation inhibitors
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes the synthesis and biological evaluation of highly substituted, ring-fused 2-pyridones. The utility of the bicyclic 2-pyridones to gain fundamental insights into the disease processes of bacterial infections and Alzheimer’s disease has been investigated.

The 2-pyridones have mainly been studied as a new class of anti-infective agents termed pilicides. The function of the pilicides has been explored using uropathogenic E. coli (UPEC) as a prototype pathogen and urinary tract infection as a model disease. The pilicides target the infectious ability of UPEC by inhibiting key proteins (chaperones) in the so-called chaperone-usher pathway, thus preventing the assembly of bacterial surface organelles (pili/fimbriae).

Synthetic pathways to aminomethylate the 2-pyridones have been developed in order to increase their aqueous solubility while retaining biological activity. Also, the importance of a carboxylic acid has been demonstrated in studies with various carboxylate derivatives and by bioisosteric replacement. Moreover, synthetic procedures to extend the backbone of the rigid, dipeptide-mimicking 2-pyridones have been established. This rendered peptidomimetic building blocks and structures that alongside their potential use as pilicides are of more general interest in peptidomimetic-related research.

The potential pilicides have been screened for chaperone affinity using relaxation-edited 1H-NMR spectroscopy. In addition, their ability to inhibit pilus biogenesis in E. coli has been demonstrated by assays of hemagglutination, biofilm formation and attachment to bladder cells, as well as with electron and atomic force microscopy. Moreover, it has been confirmed that pilicides regulate the expression of pili without affecting the biofunctional properties of the pilus rod. This was verified by measurements of individual P pili, on living bacteria, using force measuring optical tweezers. The pilicide binding site was investigated using NMR spectroscopy and X-ray crystallography of a pilicide-chaperone complex. Based on the results obtained, a mechanism whereby the pilicides may inhibit pilus assembly was proposed, which was subsequently experimentally supported by surface plasmon resonance assays and genetic analysis.

Finally, based on the generic 2-pyridone scaffold, a new collection of substituted compounds has been synthesized and validated as inhibitors of Amyloid β (Aβ)-peptide aggregation, which has been suggested to be involved in Alzheimer’s disease.

Place, publisher, year, edition, pages
Umeå: Kemi, 2006. 101 p.
2-pyridone, peptidomimetic, antibacterial, pili, Escherichia coli, virulence, amyloid, Alzheimer’s.
National Category
Organic Chemistry
urn:nbn:se:umu:diva-909 (URN)91-7264-157-6 (ISBN)
Public defence
2006-11-24, KB3B1, KBC, Linneaus väg 7, 901 87 Umeå, Umeå, 10:00 (English)
Available from: 2006-11-02 Created: 2006-11-02 Last updated: 2011-04-21Bibliographically approved

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Åberg, VeronicaHedenström, MattiasAlmqvist, Fredrik
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