Topoisomerase IV

Definition

Topoisomerase IV is an enzyme in bacteria that helps to separate replicated DNA strands during cell division. It plays a crucial role in the final stages of DNA replication by resolving intertwined DNA molecules.

5 Must Know Facts For Your Next Test

1. Topoisomerase IV is essential for decatenation, the process of untangling linked daughter chromosomes.
2. It primarily introduces transient double-strand breaks in the DNA helix to allow separation of the intertwined DNA molecules.
3. Topoisomerase IV activity is critical for bacterial cell viability and proper chromosome segregation.
4. Quinolone antibiotics target Topoisomerase IV, inhibiting its function and thus preventing bacterial replication.
5. Topoisomerase IV consists of two subunits, ParC and ParE, which work together to perform its enzymatic functions.

Review Questions

Related terms

DNA Gyrase:

Another type of topoisomerase in bacteria that introduces negative supercoils into DNA.

Decatenation: The process of untangling interlinked daughter chromosomes during or after replication.

Quinolones:

A class of antibiotics that inhibit bacterial enzymes like Topoisomerase IV and DNA Gyrase.