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Ketolide resistance conferred by short peptides
S Tripathi1, P S Kloss, A S Mankin
1Center for Pharmaceutical Biotechnology, University of Illinois, Chicago, Illinois 60607, USA.
The Journal of Biological Chemistry
|August 1, 1998
Summary
Researchers identified a pentapeptide (MRFFV) that confers high resistance to the ketolide antibiotic HMR3004. This peptide may displace antibiotics from the ribosome, enabling continued protein synthesis.
Area of Science:
- Microbiology
- Molecular Biology
- Drug Resistance
Background:
- Macrolide antibiotics are crucial for treating bacterial infections.
- Antibiotic resistance, particularly to macrolides, poses a significant global health threat.
- Understanding resistance mechanisms is vital for developing new therapeutic strategies.
Purpose of the Study:
- To identify novel peptides that confer resistance to ketolide antibiotics.
- To elucidate the mechanism of action for macrolide resistance peptides.
- To propose a model for peptide-antibiotic interaction at the ribosomal level.
Main Methods:
- Selection of resistant clones from a random pentapeptide mini-gene library.
- Identification of the highest-resistance conferring pentapeptide (MRFFV).
- Comparative analysis of amino acid sequences of resistance peptides against different macrolides.
Main Results:
- The pentapeptide MRFFV conferred the highest level of resistance to the ketolide HMR3004.
- A correlation was observed between peptide sequences and macrolide antibiotic structures.
- Evidence suggests peptide-drug interaction on the ribosome.
Conclusions:
- A "bottle brush" model is proposed, where resistance peptides displace macrolide antibiotics from the ribosome.
- This displacement mechanism allows for the continuation of protein synthesis in the presence of antibiotics.
- Findings offer insights into novel strategies for combating macrolide resistance.