Self-Aggregating Deep Cavitand Acts as a Fluorescence Displacement Sensor for Lysine Methylation

Area of Science:

• Biochemistry
• Analytical Chemistry
• Chemical Sensing

Background:

• Histone modifications, such as trimethylation, play crucial roles in gene regulation.
• Accurate detection of trimethylated peptides is essential for understanding epigenetic processes.
• Existing methods for detecting histone modifications can be complex and lack specificity.

Purpose of the Study:

• To develop a novel dual-mode sensing system for trimethylated peptides.
• To enable the determination of histone demethylase activity.
• To create a sensitive and selective detection method based on host:guest chemistry.

Main Methods:

• Design of an aggregative host:guest indicator displacement sensing system.
• Utilizing selective recognition of trimethylammonium salts.
• Employing reversible lipophilic aggregation for signal generation.
• Controlling aggregation with chaotropic anions for enhanced discrimination.

Main Results:

• Successful creation of a dual-mode sensing system.
• Demonstrated sensitivity dependent on both affinity and indicator lipophilicity.
• Achieved selective discrimination between trimethyllysines and lysine through controlled aggregation.
• Enabled the determination of histone demethylase activity.

Conclusions:

• The developed system offers a unique approach for detecting trimethylated peptides.
• The dual-mode sensing mechanism provides enhanced sensitivity and selectivity.
• This method serves as a valuable tool for studying histone demethylase activity and epigenetic regulation.