Cited by 224Antibiotic Resistance in BacteriaDrug Transport and Resistance MechanismsBacterial Genetics and Biotechnology

Multidrug Efflux Pump AcrAB of Salmonella typhimurium Excretes Only Those β-Lactam Antibiotics Containing Lipophilic Side Chains

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Nikaido, Hiroshi, Basina, Marina, Nguyen, Vy, Rosenberg, Emiko Y.·1998·Journal of Bacteriology

Abstract

We found that the previously reported SS-B drug-supersusceptible mutant of Salmonella typhimurium (S. Sukupolvi, M. Vaara, I. M. Helander, P. Viljanen, and P. H. Mäkelä, J. Bacteriol. 159:704–712, 1984) had a mutation in the acrAB operon. Comparison of this mutant with its parent strain and with an AcrAB-overproducing strain showed that the activity of the AcrAB efflux pump often produced significant resistance to β-lactam antibiotics in the complete absence of β-lactamase. The effect of AcrAB activity on resistance was more pronounced with agents containing more lipophilic side chains, suggesting that such compounds were better substrates for this pump. This correlation is consistent with the hypothesis that only those molecules that become at least partially partitioned into the lipid bilayer of the cytoplasmic membrane are captured by the AcrAB pump. According to this mechanism, the pump successfully excretes even those β-lactams that fail to traverse the cytoplasmic membrane, because these compounds are likely to become partitioned into the outer leaflet of the bilayer. Even the compounds with lipophilic side chains were shown to penetrate across the outer membrane relatively rapidly, if the pump was inactivated genetically or physiologically. The exclusion of such compounds, exemplified by nafcillin, from cells of the wild-type S. typhimurium was previously interpreted as the result of poor diffusion across the outer membrane (H. Nikaido, Biochim. Biophys. Acta 433:118–132, 1976), but it is now recognized as the consequence of efficient pumping out of entering antibiotics by the active efflux process.

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Crossref · 10.1128/jb.180.17.4686-4692.1998

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  • S. enterica serovar Typhimurium increases levels of AcrB to excrete β-lactam antibiotics.

    “Indeed, overexpression of the efflux pumps Cdr1, Cdr2, or Mdr1 is a common way adopted by C. albicans to detoxify itself from xenobiotics [100]; P. aeruginosa does the same with MexAB-OprM and MexXY-OprM [101], and S. enterica serovar Typhimurium increases the levels of AcrB to excrete β-lactam antibiotics [102].”

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Research works printed but not linked: 3

  1. [31]31. Rekker, R. F. 1977. The hydrophobic fragmental constant. Its derivation and application, a means of characterizing membrane systems. Elsevier Scientific Publishing Co., Amsterdam, The Netherlands.
  2. [34]34. Sambrook, J., E. F. Fritsch, and T. Maniatis. 1989. Molecular cloning: a laboratory manual, 2nd ed. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y.
  3. [35]35. Sanderson, K. E., A. Hessel, S.-L. Liu, and K. E. Rudd. 1996. The genetic map of Salmonella typhimurium , edition VIII, p. 1903-1999. In F. C. Neidhardt, R. Curtiss III, J. L. Ingraham, E. C. C. Lin, K. B. Low, B. Magasanik, W. S. Reznikoff, M. Riley, M. Schaechter, and H. E. Umbarger (ed.), Escherichia coli and Salmonella : cellular and molecular biology, 2nd ed. ASM Press, Washington, D.C.

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Authors
Nikaido, H., Basina, M., Nguyen, V., & Rosenberg, E. Y.
Affiliations
University of California, Berkeley (US)
Venue
Journal of Bacteriology
Published
1998-09
Volume
180
Issue
17
Pages
4686-4692
ISSN
  • 0021-9193 (ISSN-L)
  • 1098-5530
OpenAlex
W1909542718
Cited by
224
References
39
Citations by year
2026: 1 · 2025: 1 · 2024: 5 · 2023: 4 · 2022: 4 · 2021: 6 · 2020: 5 · 2019: 10 · 2018: 10 · 2017: 8 · 2016: 10 · 2015: 7 · 2014: 4 · 2013: 4 · 2012: 5
FWCI
5.93
Type
journal article
Language
en
Open access
Locations
  • Journal of Bacteriology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Allergy and Infectious Diseases (R37AI009644, R01AI009644, AI 09644)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
AcrAB efflux pump, multidrug efflux, Salmonella typhimurium, beta-lactam antibiotics, antibiotic resistance, lipophilic side chains, membrane partitioning, outer membrane permeability, nafcillin
MeSH terms
Anti-Bacterial Agents, Bacterial Proteins, Cephalosporins, DNA-Binding Proteins, Drug Resistance, Microbial, Microbial Sensitivity Tests, Mutation, Nafcillin, Phenotype, Salmonella typhimurium, Transduction, Genetic

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