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Monoclonal antibody to an aminoglycoside-resistance factor from Pseudomonas aeruginosa
1Department of Medicine, Medical University of South Charleston.
Abstract:
Aminoglycoside resistance (AMGr) in Pseudomonas aeruginosa is most commonly due to a membrane permeability factor. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of outer membrane proteins (OMPs) from AMGr strains of P. aeruginosa (resistant to tobramycin, gentamicin, and amikacin) revealed a unique OMP of 42 kilodaltons (kDa) when compared with aminoglycoside-susceptible strains of P. aeruginosa. A monoclonal antibody (MAb) to an AMGr strain of P. aeruginosa was prepared and used to study AMGr. This MAb, PS1, recognized a unique OMP of 42 kDa present primarily in AMGr strains. MAb PS1 had a binding sensitivity of 83% (n = 46), for AMGr P. aeruginosa, and a specificity of 85% (n = 36), as determined by immunoblot assay. This MAb may be useful for investigating the basis of AMGr in P. aeruginosa.
Insights
Aminoglycoside resistance in Pseudomonas aeruginosa involves outer membrane proteins. A specific 42 kDa outer membrane protein (OMP) was identified in resistant strains, detectable by a novel monoclonal antibody (PS1).
Area of Science:
- Microbiology
- Molecular Biology
- Immunology
Background:
- Aminoglycoside resistance (AMGr) in Pseudomonas aeruginosa often stems from reduced drug uptake due to membrane permeability changes.
- Outer membrane proteins (OMPs) play a crucial role in the permeability barrier of Gram-negative bacteria like P. aeruginosa.
Purpose of the Study:
- To identify potential outer membrane protein (OMP) markers associated with aminoglycoside resistance (AMGr) in Pseudomonas aeruginosa.
- To develop a diagnostic tool for detecting AMGr in P. aeruginosa strains.
Main Methods:
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was used to analyze OMPs from aminoglycoside-susceptible and resistant P. aeruginosa strains.
- A monoclonal antibody (MAb), designated PS1, was generated against an AMGr P. aeruginosa strain.
- Immunoblot assays were performed to evaluate the specificity and sensitivity of MAb PS1 for detecting AMGr-associated OMPs.
Main Results:
- SDS-PAGE revealed a unique 42 kilodalton (kDa) OMP in AMGr P. aeruginosa strains compared to susceptible strains.
- The MAb PS1 specifically recognized this 42 kDa OMP, which was predominantly found in AMGr strains.
- MAb PS1 demonstrated a binding sensitivity of 83% and a specificity of 85% for AMGr P. aeruginosa.
Conclusions:
- A distinct 42 kDa OMP is associated with aminoglycoside resistance in Pseudomonas aeruginosa.
- The monoclonal antibody PS1 shows promise as a diagnostic marker for identifying AMGr P. aeruginosa.
- Further investigation using MAb PS1 could elucidate the precise role of this OMP in the mechanism of aminoglycoside resistance.