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Dynamic Force Spect...
Dynamic Force Spectroscopy of E. coli P Pili
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- Andersson, Magnus (author)
- Umeå universitet,Institutionen för fysik
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- Fällman, Erik (author)
- Umeå universitet,Institutionen för fysik
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- Uhlin, Bernt Eric (author)
- Umeå universitet,Institutionen för molekylärbiologi (Medicinska fakulteten),Uhlin
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- Axner, Ove (author)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- Elsevier BV, 2006
- 2006
- English.
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In: Biophysical Journal. - : Elsevier BV. - 0006-3495 .- 1542-0086. ; 91:7, s. 2717-2725
- Related links:
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http://www.cell.com/...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Surface organelles (so-called pili) expressed on the bacterial membrane mediate the adhesion of Escherichia coli causing urinary tract infection. These pili possess some extraordinary elongation properties that are assumed to allow a close bacterium-to-host contact even in the presence of shear forces caused by urine flow. The elongation properties of P pili have therefore been assessed for low elongation speeds (steady-state conditions). This work reports on the behavior of P pili probed by dynamic force spectroscopy. A kinetic model for the unfolding of a helixlike chain structure is derived and verified. It is shown that the unfolding of the quaternary structure of the PapA rod takes place at a constant force that is almost independent of elongation speed for slow elongations (up to ~0.4 μm/s), whereas it shows a dynamic response with a logarithmic dependence for fast elongations. The results provide information about the energy landscape and reaction rates. The bond length and thermal bond opening and closure rates for the layer-to-layer bond have been assessed to ~0.76 nm, ~0.8 Hz, and ~8 GHz, respectively. The results also support a previously constructed sticky-chain model for elongation of the PapA rod that until now had been experimentally verified only under steady-state conditions.
Publication and Content Type
- ref (subject category)
- art (subject category)
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