Fluorescence-based tools to probe G-quadruplexes in cell-free and cellular environments

Area of Science:

• Biophysics
• Biochemistry
• Molecular Biology

Background:

• G-quadruplex (GQ) structures are implicated in regulating cellular processes.
• Targeting GQs with small molecules is a promising strategy for cancer chemotherapy.
• GQ sequence diversity and structural polymorphism present significant challenges for drug development.

Purpose of the Study:

• To review advancements in biophysical tools utilizing fluorescence for probing GQ structure and recognition.
• To discuss the application of these tools in both cell-free and cellular environments.
• To highlight challenges and future directions in tetraplex-directed therapeutics.

Main Methods:

• Utilizing environment-sensitive fluorescent nucleoside analogs for assessing GQ structure and ligand binding.
• Employing structure-specific antibodies for visualizing and confirming GQs in cells.
• Reviewing small molecule probes for GQ detection and characterization.

Main Results:

• Fluorescent probes, including labeled nucleoside analogs and antibodies, are effective in studying GQ structures.
• These tools facilitate the assessment of subtle structural differences and ligand interactions.
• Visualization of DNA and RNA GQs within cellular environments is achievable.

Conclusions:

• Biophysical tools with fluorescence readout are crucial for understanding GQ structure and function.
• Overcoming challenges in GQ targeting requires the development of novel tools and techniques.
• Advancements in tetraplex research will significantly impact therapeutic strategies.