Describe the mechanism of action of topoisomerases.

Question

21 Jul 2024

Answer :

Word Count : 579

Topoisomerases are essential enzymes that regulate the topology of DNA during various cellular processes, such as replication, transcription, and repair. They manage the topological stress that arises from the unwinding and rewinding of the DNA double helix, ensuring that these processes proceed efficiently and accurately. Topoisomerases achieve this by introducing transient breaks in the DNA strands, allowing for the resolution of torsional strain. There are two main types of topoisomerases: Type I and Type II, each with distinct mechanisms of action.

### Type I Topoisomerases

Type I topoisomerases primarily resolve single-strand DNA breaks. These enzymes operate by cleaving one strand of the DNA double helix, allowing the unbroken strand to pass through the break, and then resealing the cut strand. The key steps in their mechanism are:

1. Binding and Cleavage: The enzyme binds to the DNA and introduces a transient single-strand break. This ____ ____ _________ ________ _____ _____ __________ _________ ______ ______ __________.
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