Quinolones Interference with Bacterial Processes

Quinolones are a class of synthetic antimicrobial agents. Their primary mechanism of action is to target essential enzymes involved in bacterial DNA management.

Mechanism of Action

Quinolones specifically inhibit two key bacterial enzymes:

• DNA gyrase (Bacterial Topoisomerase II): This enzyme is crucial for relieving torsional stress during DNA replication and transcription by introducing negative supercoils into the bacterial DNA.
• Topoisomerase IV: This enzyme is primarily responsible for decatenating (unlinking) replicated daughter DNA chromosomes, allowing them to segregate properly before cell division.

By inhibiting these enzymes, quinolones disrupt the normal processes of DNA replication, repair, and transcription. This leads to DNA strand breakage and prevents the bacteria from multiplying.

Target Process

The direct effect of quinolone action is the disruption of bacterial nucleic acid synthesis. They do not affect viral nucleic acid synthesis or protein synthesis in bacteria.

Conclusion

Therefore, quinolones act on/interfere with Bacterial nucleic acid synthesis.