The Acid/Base Characterization of Molecules with Epigenetic Activity.

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Drug Discovery

Background:

• Acidic and basic functional groups critically impact molecular properties, including drug interactions and toxicity.
• Basicity is linked to issues like molecular promiscuity and hERG channel blockade.
• No prior systematic analysis of acid/base profiles in epigenomic compound libraries existed.

Purpose of the Study:

• To characterize the acidic ionization constant distribution within a large library of compounds targeting epigenetic mechanisms.
• To compare the acid/base profiles of epigenomic compound libraries against established chemical reference sets.
• To evaluate the potential of these libraries for identifying novel epigenetic inhibitors based on their chemical properties.

Main Methods:

• Analysis of the acidic ionization constant (pKa) distribution for 7820 compounds active against epigenetic targets.
• Comparative analysis of the acid/base profiles of epigenomic libraries versus reference libraries (food chemicals, natural products, approved drugs).

Main Results:

• The acid/base profiles of histone lysine demethylase (KDM) ligands showed similarity to approved drugs.
• Histone acetyltransferase (HAT) ligands exhibited acid/base functional groups commonly found in food chemicals and natural products.
• These findings suggest distinct chemical spaces for different epigenetic target classes.

Conclusions:

• The chemical characteristics of KDM and HAT ligands indicate their potential for developing new epigenetic drugs.
• Understanding the acid/base profiles aids in the rational design and selection of compounds for epigenetic drug discovery.
• This research provides a foundation for future investigations into the structure-activity relationships of epigenetic modulators.