News: A recent study identified a molecular “safety catch” that regulates helicase, preventing premature DNA replication and maintaining genomic stability.

About Helicase

• Enzyme + motor protein that unwinds double-stranded DNA into single strands.
• Essential for DNA replication, repair and chromosome stability.
• Uses ATP hydrolysis to separate hydrogen bonds between DNA base pairs.
• Creates a Y-shaped replication fork, exposing DNA strands for replication.
• Works with topoisomerase to reduce DNA tension and single-strand binding proteins to prevent reannealing.

Importance

• Mutations in helicase genes can cause genomic instability and disease.
• Examples: Bloom syndrome and Werner syndrome.

Applications

• Genetic engineering
• Gene therapy research
• Helicase-Dependent Amplification (HDA) — a DNA amplification technique and alternative to PCR.