Abstract
Detailed analyses of the mechanisms that mediate binding of the uropathogenic Escherichia coli to host cells are essential, as attachment is a prerequisite for the subsequent infection process. We explore, by means of force measuring optical tweezers, the interaction between the galabiose receptor and the adhesin PapG expressed by P pili on single bacterial cells. Two variants of dynamic force spectroscopy were applied based on constant and non-linear loading force. The specific PapG–galabiose binding showed typical slip-bond behaviour in the force interval (30–100 pN) set by the pilus intrinsic biomechanical properties. Moreover, it was found that the bond has a thermodynamic off-rate and a bond length of 2.6 × 10−3 s−1 and 5.0 Å, respectively. Consequently, the PapG–galabiose complex is significantly stronger than the internal bonds in the P pilus structure that stabilizes the helical chain-like macromolecule. This finding suggests that the specific binding is strong enough to enable the P pili rod to unfold when subjected to strong shear forces in the urinary tract. The unfolding process of the P pili rod promotes the formation of strong multipili interaction, which is important for the bacterium to maintain attachment to the host cells.
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Abbreviations
- UPEC:
-
Uropathogenic Escherichia coli
- UTI:
-
Urinary tract infection
- FMOT:
-
Force measuring optical tweezers
- AFM:
-
Atomic force microscopy
- DFS:
-
Dynamic force spectroscopy
- MSE:
-
Mean square error
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Acknowledgments
We acknowledge Prof. Bernt-Eric Uhlin and Monica Persson, Department of Molecular Biology, Umeå University, Sweden, for providing the E. coli strains. We thank Dr. Erik Fällman for laboratorial assistance. We also thank Prof. Ulf J. Nilsson, Organic and Bioorganic Chemistry, Lund University, Sweden for providing the amino-galabiose coated beads. Economical support from the Magn. Bergvalls Foundation, Sweden, is also acknowledged.
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Björnham, O., Nilsson, H., Andersson, M. et al. Physical properties of the specific PapG–galabiose binding in E. coli P pili-mediated adhesion. Eur Biophys J 38, 245–254 (2009). https://doi.org/10.1007/s00249-008-0376-y
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DOI: https://doi.org/10.1007/s00249-008-0376-y