ArticleAntimicrobial agents and chemotherapy2003
Contribution of the 8-methoxy group to the activity of gatifloxacin against type II topoisomerases of Streptococcus pneumoniae.
Article in Antimicrobial agents and chemotherapy, 2003. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 34 citations in OpenAlex.
- A Review of Fluoroquinolones with a Focus on Veterinary-Approved Agents.Biomolecules · 2026Review
- Structural Characterization of the Millennial Antibacterial (Fluoro)Quinolones-Shaping the Fifth Generation.Pharmaceutics · 2021Review
- Quinolones: Mechanism, Lethality and Their Contributions to Antibiotic Resistance.Molecules (Basel, Switzerland) · 2020Review
- Article
- Ubiquitous Nature of Fluoroquinolones: The Oscillation between Antibacterial and Anticancer Activities.Antibiotics (Basel, Switzerland) · 2017Review
- Reactive Oxygen Species Contribute to the Bactericidal Effects of the Fluoroquinolone Moxifloxacin in Streptococcus pneumoniae.Antimicrobial agents and chemotherapy · 2016Article
- Contribution of topoisomerase IV mutation to quinolone resistance in Mycoplasma genitalium.Antimicrobial agents and chemotherapy · 2013Article
- Review
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5 authors.
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Abstract
The inhibitory activities (50% inhibitory concentrations [IC(50)s]) of gatifloxacin and other quinolones against both DNA gyrase and topoisomerase IV of the wild-type Streptococcus pneumoniae IID553 were determined. The IC(50)s of 10 compounds ranged from 4.28 to 582 microg/ml against DNA gyrase and from 1.90 to 35.2 microg/ml against topoisomerase IV. The inhibitory activity against DNA gyrase was more varied than that against topoisomerase IV among fluoroquinolones. The IC(50)s for DNA gyrase of the 8-methoxy quinolones gatifloxacin and AM-1147 were approximately seven times lower than those of their 8-H counterparts AM-1121 and ciprofloxacin, whereas the IC(50)s for topoisomerase IV were 1.5 times lower. Moreover, the IC(50) ratios (IC(50) for DNA gyrase/IC(50) for topoisomerase IV) of gatifloxacin, AM-1147, and moxifloxacin, which possess 8-methoxy groups, were almost the same. The 8-methoxy quinolones showed higher antibacterial activity and less mutant selectivity against IID553 than their 8-H counterparts. These results suggest that the 8-methoxy group enhances both target inhibition, especially for DNA gyrase, leading to potent antipneumococcal activity and dual inhibition against both DNA gyrase and topoisomerase IV in the bacterial cell.
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