What is the role of TolC in Gram-negative bacteria?
What is the role of TolC in Gram-negative bacteria?
TolC is an archetypal member of the outer membrane efflux protein (OEP) family. These proteins are involved in export of small molecules and toxins across the outer membrane of Gram-negative bacteria. Genomes of some bacteria such as Pseudomonas species contain multiple copies of OEPs.
How do efflux pump inhibitors work?
Antibiotic efflux is one of the major mechanisms, whereby bacteria pump out the antibiotics from their cellular interior to the external environment using special transporter proteins called efflux pumps. Inhibiting these pumps seems to be an attractive strategy at a time when novel antibiotic supplies are dwindling.
What is the role of the AcrAB TolC What does it do?
The AcrAB–TolC efflux pump is able to transport vectorially a diverse array of compounds with little chemical similarity, thus conferring resistance to a broad spectrum of antibiotics. Homologous complexes are found in many Gram-negative species, including in animal and plant pathogens.
Is TolC a porin?
TolC is the first case in which a porin-like structure is formed from three separate polypeptides. Each monomer of TolC contributes four strands to the 12-stranded, antiparallel b barrel. By far the most intriguing feature of TolC is the a helical barrel, which has a novel protein architecture [45].
What is AcrAB TOLC?
AcrAB-TolC is a RND-based tripartite efflux pump, comprised of the outer membrane protein TolC, the periplasmic membrane fusion protein AcrA, and the inner membrane transporter AcrB, which cycles through three different conformational states during the drug transport process: access (L), binding (T) and extrusion (O) ( …
What is an efflux pump inhibitor?
Efflux pump inhibitors (EPIs) are molecules that can inhibit efflux pumps; they have been considered potential therapeutic agents for rejuvenating the activity of antibiotics that have already lost their activity against bacteria.
How do bacteria become antibiotic resistant?
Bacteria develop resistance mechanisms by using instructions provided by their DNA. Often, resistance genes are found within plasmids, small pieces of DNA that carry genetic instructions from one germ to another. This means that some bacteria can share their DNA and make other germs become resistant.
What does AcrAB mean?
ACRAB
| Acronym | Definition |
|---|---|
| ACRAB | Arizona Civil Rights Advisory Board |
How does the expression of the AcrAB TolC efflux pump lead to multidrug antibiotic resistance?
Overexpression of the AcrAB-TolC efflux pump is an intrinsic mechanism of multidrug resistance in Gram-negative bacteria. It can be due to the mutation in AcrR gene which is the repressor of the AcrAB operon system.
What does TOLC mean?
Test of Language Competence
TOLC
| Acronym | Definition |
|---|---|
| TOLC | Test of Language Competence |
| TOLC | Triumphing Over London Cults (UK) |
| TOLC | Take Off and Landing Coordinator |
| TOLC | TeachNet Online Learning Centre (Ireland) |
What does the tolC do in E coli?
E. coli TolC can act in both protein export and inhibitor efflux, but typically bacteria have multiple system-specific homologues [38].
How does TolC interact with the inner membrane?
In both the protein export and drug efflux machineries, TolC interacts with an inner membrane translocase of two inner membrane proteins, an energy source and an adaptor protein ( Fig. 2 ).
What kind of molecules can The TolC efflux?
TolC was subsequently also shown to have an active part in the efflux of small noxious molecules like detergents, but in the last few years it has achieved wider prominence as its efflux substrates were found to include a wide range of antibacterial drugs [25], [26].
Where are the proteins located in the tolC?
The structures of TolC and other E. coli outer membrane (OM) proteins. Each outer membrane protein is viewed from above the lipid bilayer (upper) and through the plane of the membrane (lower). Colours indicate protomers.
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