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Inhibitors of Gram-positive Cell Wall Synthesis

Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
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Updated: Jun 21, 2026

Antibiotic Dereplication Using the Antibiotic Resistance Platform
10:49

Antibiotic Dereplication Using the Antibiotic Resistance Platform

Published on: October 17, 2019

[Macrolides and ketolides].

Nazaret Cobos-Trigueros1, Oier Ateka, Cristina Pitart

  • 1Hospital Clínic, IDIBAPS, Universidad de Barcelona, España.

Enfermedades Infecciosas Y Microbiologia Clinica
|July 24, 2009
PubMed
Summary
This summary is machine-generated.

Macrolide and ketolide antibiotics target 23S RNA but differ in resistance and potency. Telithromycin shows activity against resistant strains, though its use is restricted due to severe hepatitis risk.

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Antibiotic Dereplication Using the Antibiotic Resistance Platform
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Published on: October 17, 2019

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Area of Science:

  • Pharmacology
  • Microbiology
  • Infectious Diseases

Background:

  • Macrolides and ketolides are antibiotic classes with overlapping spectra but distinct binding affinities to 23S RNA.
  • Resistance to macrolides has increased in key pathogens like Streptococcus pneumoniae and Streptococcus pyogenes.
  • Ketolides, such as telithromycin, offer an alternative with maintained activity against resistant strains.

Purpose of the Study:

  • To compare the antibacterial effects and resistance profiles of macrolides and ketolides.
  • To highlight the clinical implications of their pharmacokinetic and pharmacodynamic properties.
  • To review their safety, drug interactions, and therapeutic indications, particularly for respiratory tract infections.

Main Methods:

  • Comparative analysis of antibiotic mechanisms of action and binding sites.
  • Review of antibacterial spectrum and activity against resistant microbial strains.
  • Evaluation of pharmacokinetic data, including metabolism, distribution, and excretion.
  • Assessment of clinical efficacy, safety profiles, and drug interactions.

Main Results:

  • Macrolides and ketolides bind to 23S RNA, with differences affecting potency and resistance activity.
  • Increased macrolide resistance in pneumococci and Streptococcus pyogenes contrasts with telithromycin's retained activity.
  • Both classes are metabolized by CYP3A4, posing risks for drug interactions; they achieve high intracellular concentrations but do not penetrate the cerebrospinal fluid.
  • Generally well-tolerated, macrolides and ketolides are indicated for respiratory infections, with telithromycin reserved for specific pneumonia cases due to severe hepatitis risk.

Conclusions:

  • Macrolides and ketolides exhibit nuanced differences in antibacterial efficacy and resistance profiles.
  • Telithromycin remains active against macrolide-resistant strains but requires cautious use due to potential severe adverse effects like hepatitis.
  • These antibiotics are crucial for treating community-acquired respiratory infections, with careful consideration of drug interactions and patient-specific risks.