AMR Gene Family
Qnr proteins are pentapeptide repeat proteins that mimic DNA and protect the cell from the activity of fluoroquinolone antibiotics
Antibiotic
Ciprofloxacin is a bacteriocidal fluoroquinolone. It blocks bacterial DNA replication by binding to the toposiomerase II or IV-DNA complex (or cleavable complex), thereby causing double-stranded breaks in the bacterial chromosome.
Antibiotic
Levofloxacin is a synthetic chemotherapeutic antibiotic of the fluoroquinolone drug class. Its main target is topoisomerase IV, inhibiting its function and disrupting DNA replication.
Antibiotic
Moxifloxacin is a fourth generation synthetic fluoroquinolone chemotherapeutic agent, and has been shown to be significantly more active than levofloxacin (4 to 8 times more) against Streptococcus pneumoniae. It acts by inhibiting bacterial DNA topoisomerases.
Antibiotic
Gatifloxacin is an 8-methoxy, 7-piperazinyl, 6-fluoroquinolone that can be taken orally or by intravenous administration. It is active against most Gram-positive and Gram-negative bacteria, but inactive against non-fermenting Gram-negative rods including Pseudomonas aeruginosa.
Antibiotic
Nalidixic acid is a quinolone derivative of naphthyridine active against many enterobacteria, but ineffective against Ps aeruginosa, Gram-positive bacteria, and anaerobes. Acquired resistance is common in nalidixic acid treatments.
Antibiotic
Norfloxacin is a 6-fluoro, 7-piperazinyl quinolone with a wide range of activity against Gram-negative bacteria. It is inactive against most anaerobes.
Antibiotic
Sparfloxacin is a dimethylpiperazinyl difluoroquinolone that acts by inhibiting DNA gyrase. It is active against aerobic Gram-positive and Gram-negative bacteria, as well as some mycobacteria. It has moderate activity against some anaerobes.
Drug Class
The fluoroquinolones are a family of synthetic broad-spectrum antibiotics that are 4-quinolone-3-carboxylates. These compounds interact with topoisomerase II (DNA gyrase) to disrupt bacterial DNA replication, damage DNA, and cause cell death.
Resistance Mechanism
Protection of antibiotic action target from antibiotic binding, which process will result in antibiotic resistance.