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Expression of surface hydrophobicity encoded by R-plasmids in Escherichia coli laboratory strains
Abstract:
The inclusion of drug-resistance plasmids (R-plasmids) in Escherichia coli strains has been shown to determine the formation of specific surface structures which could modify bacterial surface characteristics relevant for pathogenic processes. Thirtyone R-plasmids (from different incompatibility groups) have been transferred to three E. coli laboratory strains, and surface hydrophobicity modifications have been measured by three methods: "salting-out", adsorption to hexadecane and adsorption to xylene. The results obtained show that the presence of R-plasmids produced variations which are dependent on the receptor strains and measuring method employed. Also, it has been found that the plasmids behave differently depending on the strain in which they are included. The results obtained by the "salting-out" method are not correlative with those obtained by adsorption to hydrocarbons, probably due to the implication of different hydrophobic molecules in the interaction with salt or hydrocarbons. Concluding, the choice of receptor strain and measuring method are of great importance for the investigation of surface hydrophobicity (and probably other characteristics) encoded by R-plasmids.
Insights
Drug-resistance plasmids (R-plasmids) alter Escherichia coli surface hydrophobicity. These changes vary based on the specific R-plasmid, the host bacterial strain, and the measurement method used.
Area of Science:
- Microbiology
- Bacterial genetics
- Surface science
Background:
- Drug-resistance plasmids (R-plasmids) can influence bacterial surface properties.
- Surface characteristics are crucial for bacterial pathogenesis.
Purpose of the Study:
- To investigate how R-plasmids affect the surface hydrophobicity of Escherichia coli.
- To determine if R-plasmid effects are dependent on the host strain and measurement technique.
Main Methods:
- Transfer of 31 R-plasmids from different incompatibility groups into three E. coli laboratory strains.
- Measurement of bacterial surface hydrophobicity using "salting-out", hexadecane adsorption, and xylene adsorption methods.
Main Results:
- R-plasmid presence significantly altered E. coli surface hydrophobicity.
- Observed variations were dependent on both the receptor E. coli strain and the hydrophobicity measurement method.
- Different R-plasmids exhibited distinct effects when present in the same host strain.
- Results from "salting-out" and hydrocarbon adsorption methods were not consistently correlated.
Conclusions:
- The impact of R-plasmids on bacterial surface hydrophobicity is complex and influenced by host strain and experimental methodology.
- Careful selection of receptor strains and measurement techniques is essential for studying R-plasmid-encoded surface characteristics.