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Antibiotic uptake and transport by bacteria.
1Department of Medical Microbiology, London Hospital Medical College, UK.
Scandinavian Journal of Infectious Diseases. Supplementum
|January 1, 1990
Summary
Antibiotic effectiveness depends on crossing bacterial barriers like the cell wall and outer membrane. Resistance mechanisms often involve reduced drug uptake or enhanced removal.
Area of Science:
- Microbiology
- Pharmacology
- Drug Discovery
Background:
- Bacterial cell envelopes present significant barriers to antibiotic penetration.
- The structure of these barriers varies greatly among bacterial species, influencing drug accessibility.
- Understanding these barriers is crucial for developing effective antimicrobial therapies.
Purpose of the Study:
- To elucidate the mechanisms by which bacterial cell envelopes impede antibiotic access.
- To explore how antibiotic properties and bacterial species influence barrier penetration.
- To identify common resistance strategies related to overcoming these barriers.
Main Methods:
- Analysis of antibiotic penetration through bacterial cell envelopes (e.g., outer membrane, cell wall).
- Examination of factors affecting antibiotic uptake, including drug physicochemical properties and bacterial porins.
- Review of antibiotic resistance mechanisms related to barrier traversal and efflux.
Main Results:
- Gram-negative bacteria possess an outer membrane that restricts antibiotic entry, often requiring passage through porins.
- Antibiotic uptake is influenced by size, charge, and hydrophilicity, with larger molecules (>800 D) often excluded.
- Resistance mechanisms include porin loss, reduced active transport, drug excretion, and target modification.
Conclusions:
- Bacterial cell envelope structure is a critical determinant of antibiotic efficacy.
- Antibiotic design must consider penetration through specific bacterial barriers.
- Bacterial resistance evolves through diverse strategies impacting drug uptake and action.