PMID:21541325
| Citation |
Deininger, KN, Horikawa, A, Kitko, RD, Tatsumi, R, Rosner, JL, Wachi, M and Slonczewski, JL (2011) A requirement of TolC and MDR efflux pumps for acid adaptation and GadAB induction in Escherichia coli.PLoS ONE 6:e18960 |
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| Abstract |
The TolC outer membrane channel is a key component of several multidrug resistance (MDR) efflux pumps driven by H(+) transport in Escherichia coli. While tolC expression is under the regulation of the EvgA-Gad acid resistance regulon, the role of TolC in growth at low pH and extreme-acid survival is unknown. |
| Links |
PubMed Online version:10.1371/journal.pone.0018960 |
| Keywords |
Acids; Adaptation, Physiological; Bacterial Outer Membrane Proteins; Drug Resistance, Multiple; Enzyme Induction; Escherichia coli K12; Escherichia coli Proteins; Glutamate Decarboxylase; Glutamates; Hydrogen-Ion Concentration; Membrane Proteins; Membrane Transport Proteins; Microbial Viability; Mutation |
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Main Points of the Paper
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Materials and Methods Used
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Phenotype Annotations
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| Phenotype of | Taxon Information | Genotype Information (if known) | Condition Information | OMP ID | OMP Term Name | ECO ID | ECO Term Name | Notes | Status |
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a mutation or genetic difference within a strain |
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TolC was required for EXTREME-acid survival (pH 2) of strain W3110 grown aerobically to stationary phase. A tolC deletion decreased extreme-acid survival (acid resistance) of aerated pH 7.0-grown cells by 105-fold and of pH 5.5-grown cells by 10-fold. TolC was required for expression of glutamate decarboxylase (GadA, GadB), a key component of glutamate-dependent acid resistance (Gad). TolC was also required for maximal exponential growth of E. coli K-12 W3110, in LBK medium buffered at pH 4.5-6.0, but not at pH 6.5-8.5. The TolC growth requirement in moderate acid was independent of Gad. |
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Notes
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