Cited by 1,312Bacterial Genetics and BiotechnologyAntibiotic Resistance in BacteriaPharmaceutical and Antibiotic Environmental Impacts

Bacterial silver resistance: molecular biology and uses and misuses of silver compounds

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Silver, Simon·2003·FEMS Microbiology Reviews

Abstract

Resistance to silver compounds as determined by bacterial plasmids and genes has been defined by molecular genetics. Silver resistance conferred by the Salmonella plasmid pMGH100 involves nine genes in three transcription units. A sensor/responder (SilRS) two-component transcriptional regulatory system governs synthesis of a periplasmic Ag(I)-binding protein (SilE) and two efflux pumps (a P-type ATPase (SilP) plus a three-protein chemiosmotic RND Ag(I)/H+ exchange system (SilCBA)). The same genes were identified on five of 19 additional IncH incompatibility class plasmids but thus far not on other plasmids. Of 70 random enteric isolates from a local hospital, isolates from catheters and other Ag-exposed sites, and total genomes of enteric bacteria, 10 have recognizable sil genes. The centrally located six genes are found and functional in the chromosome of Escherichia coli K-12, and also occur on the genome of E. coli O157:H7. The use of molecular epidemiological tools will establish the range and diversity of such resistance systems in clinical and non-clinical sources. Silver compounds are used widely as effective antimicrobial agents to combat pathogens (bacteria, viruses and eukaryotic microorganisms) in the clinic and for public health hygiene. Silver cations (Ag+) are microcidal at low concentrations and used to treat burns, wounds and ulcers. Ag is used to coat catheters to retard microbial biofilm development. Ag is used in hygiene products including face creams, "alternative medicine" health supplements, supermarket products for washing vegetables, and water filtration cartridges. Ag is generally without adverse effects for humans, and argyria (irreversible discoloration of the skin resulting from subepithelial silver deposits) is rare and mostly of cosmetic concern.

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Research works printed but not linked: 4

  1. [15]15. Hobman, J.L., Wilson, J.R. and Brown, N.L. (2000) Microbial mer- cury reduction. In: Environmental Metal^Microbe Interactions (Lov- ley, D.R., Ed.), pp. 177^197. ASM Press, Washington, DC.
  2. [68]68. Lu « ck, E. and Jager, M., with S.F. Laichena (Translator) (1997) Sil- ver. In: Antimicrobial Food Additives: Characteristics, Uses, E¡ects, 2nd revised edn., Chapter 7, pp. 70^72. Springer-Verlag, Berlin; ISBN: 354061138X.
  3. [84]84. Lo, J.-F., Gordon, N., Gettins, P.G.W. and Silver, S. (2002) The silver binding protein SilE of plasmid-mediated silver resistance in Escherichia coli. Proc. Natl. Acad. Sci. USA, submitted.
  4. [132]132. Silverseed, J. (2001) Colloidal Silver : Antibiotic Superhero. Mad as Hell Press; ISBN : 0970825609.

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Authors
Silver, S.
Affiliations
University of Illinois Chicago (US)
Corresponding author
Silver, Simon
Venue
FEMS Microbiology Reviews
Published
2003-06
Volume
27
Issue
2-3
Pages
341-353
ISSN
  • 0168-6445 (ISSN-L)
  • 1574-6976
OpenAlex
W2025934004
Cited by
1,312
References
118
Citations by year
2026: 19 · 2025: 27 · 2024: 47 · 2023: 50 · 2022: 62 · 2021: 68 · 2020: 71 · 2019: 66 · 2018: 75 · 2017: 72 · 2016: 85 · 2015: 86 · 2014: 85 · 2013: 78 · 2012: 85
FWCI
2.18
Type
journal article
Language
en
Open access
Locations
  • FEMS Microbiology Reviews (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Energy
  • National Institutes of Health (5r21de014777-02)
  • National Institute of Dental and Craniofacial Research (DE 14777)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
  • Physical Sciences › Environmental Science › Pollution › Pharmaceutical and Antibiotic Environmental Impacts
Keywords
silver resistance, silver compounds, bacterial plasmids, enteric bacteria, Escherichia coli, catheter-related infection, antimicrobial use, argyria, catheter coatings, biofilm inhibition, hygiene products, molecular epidemiology
MeSH terms
Escherichia coli, Genes, Bacterial, Models, Biological, Models, Genetic, Plasmids, Salmonella, Silver, Silver Sulfadiazine, Sequence Analysis, DNA, Silver Compounds, Drug Resistance, Bacterial

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