Translocation of small molecules through engineered outer-membrane channels from Gram-negative bacteria
| Autor: | Mathias Winterhalter, Rémi Terrasse |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Models Molecular Protein Conformation Biophysics Porins 010402 general chemistry Protein Engineering 01 natural sciences 03 medical and health sciences Bacterial Proteins Gram-Negative Bacteria General Materials Science Semipermeable membrane Amino Acids Lipid bilayer Chemistry Biological membrane Biological Transport Surfaces and Interfaces General Chemistry biochemical phenomena metabolism and nutrition Small molecule 0104 chemical sciences 030104 developmental biology Förster resonance energy transfer Membrane protein Porin bacteria Bacterial outer membrane Biotechnology |
| Zdroj: | The European physical journal. E, Soft matter. 41(9) |
| ISSN: | 1292-895X |
| Popis: | Selective permeability is a key feature of biological membranes. It is controlled by the physico-chemical properties of the lipid bilayer and by channel-forming membrane proteins. Here we focus on the permeation of small molecules across channel-forming proteins in Gram-negative bacteria called porins and present a new approach based on artificial amino acids. We introduced Hco, a fluorescent amino acid with characteristic excitation and emission wavelengths, into OmpF and measured FRET from Hco to dissolved Bocillin FL using solubilized OmpF porins. We examined four variants of OmpF and by doing so, we were able to show that small molecules, like Bocillin FL, are remaining long enough in the porin in order to undergo FRET and produce a reproducible fluorescence signal. This finding opens the way to quantify translocation in the future by the simultaneous detection of resistive pulses and differential fluorescence with FRET as an example. |
| Databáze: | OpenAIRE |
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