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WOHelicase is an essential enzyme during DNA replication. It performs the function of unzipping the double-stranded DNA so that each strand can serve as a template for replication.
Step-by-step Process:
1. Binding to the Origin of Replication:
Helicase binds to specific regions on DNA called origins of replication, where replication begins.
2. Breaking Hydrogen Bonds:
Helicase moves along the DNA molecule and breaks the hydrogen bonds between complementary base pairs (A-T and G-C), separating the two strands.
3. Creating the Replication Fork:
This unwinding forms a Y-shaped structure called the replication fork, where the DNA is split into two strands — a leading strand and a lagging strand.
4. Energy Requirement:
The unwinding process requires energy in the form of ATP, which helicase hydrolyzes to move and function.
5. Assistance from Other Proteins:
Single-Stranded Binding Proteins (SSBs) stabilize the unwound strands.
Topoisomerase relieves the tension ahead of the fork caused by helicase activity.
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