G-Quadruplex Unwinding Molecular Mechanisms by Helicases and Their Applications

Area of Science:

• Genomics
• Molecular Biology
• Structural Biology

Background:

• G-quadruplexes (G4s) are four-stranded nucleic acid structures found in regulatory genomic regions.
• They play roles in DNA replication, transcription, and genomic stability, and are linked to cancer.
• G4s act as barriers to DNA/RNA unwinding, potentially compromising genome integrity.

Purpose of the Study:

• To review recent structural advancements in understanding how helicases unwind G-quadruplexes.
• To provide a framework for G4 unfolding mechanisms and the design of G4-targeting therapeutics.
• To explore G4 helicase applications in nanopore sequencing.

Main Methods:

• The review focuses on structural insights primarily from protein crystallography.
• Analysis of mechanisms by which helicases resolve G4 structures.

Main Results:

• Recent structural studies illuminate helicase mechanisms for G4 unwinding.
• Insights facilitate understanding G4 unfolding and designing small-molecule G4 ligands.
• G4 helicases show promise for enhancing nanopore sequencing.

Conclusions:

• Understanding G4 helicase mechanisms is crucial for G4-targeted therapies.
• G4 helicases have potential applications in advanced sequencing technologies.