Two-Step Validation Approach for Tools To Study the DNA Repair Enzyme SNM1A

Area of Science:

• Biochemistry
• Molecular Biology
• Medicinal Chemistry

Background:

• DNA damage-repair metalloenzymes, such as SNM1A, are crucial for maintaining genomic stability.
• SNM1A plays a key role in repairing interstrand crosslinks, a highly toxic form of DNA damage.
• Studying these enzymes is challenging due to a lack of effective research tools.

Purpose of the Study:

• To develop and validate a novel approach for creating high-affinity probes for DNA damage-repair metalloenzymes.
• To assess the utility of metal-binding groups for targeting SNM1A using a two-step validation strategy.
• To generate tools for enhanced study of SNM1A and related enzymes.

Main Methods:

• Employed a fragment-based screening approach to identify suitable metal-binding fragments for enzyme targeting.
• Utilized copper-catalyzed azide-alkyne cycloaddition to incorporate identified fragments into oligonucleotides.
• Validated the binding affinity of modified oligonucleotides against the model enzyme SNM1A.

Main Results:

• Identified specific metal-binding fragments capable of targeting SNM1A.
• Successfully synthesized modified oligonucleotides containing these fragments.
• Demonstrated that modified oligonucleotides bind to SNM1A with over 1000-fold greater affinity compared to fragments alone.

Conclusions:

• The novel two-step approach effectively generates high-affinity oligonucleotide-based probes for DNA damage-repair enzymes.
• This method significantly enhances the ability to study enzymes like SNM1A.
• The strategy is broadly applicable for developing molecular tools for various DNA repair enzymes.