Histone acetyltransferases: challenges in targeting bi-substrate enzymes

Area of Science:

• Epigenetics and enzyme kinetics
• Drug discovery and development
• Molecular biology

Background:

• Histone acetyltransferases (HATs) are epigenetic enzymes involved in gene regulation and disease.
• Current HAT inhibitors exhibit limitations, including poor selectivity and reduced efficacy in vivo.
• HATs function in large protein complexes, complicating in vitro to in vivo translation.

Purpose of the Study:

• To address the gap between in vitro activity and therapeutic potential of HAT inhibitors.
• To highlight challenges in HAT inhibitor development, including enzyme complex formation and inhibitor properties.
• To emphasize the need for detailed molecular characterization of HATs and their inhibitors.

Main Methods:

• Review of existing literature on HATs, their inhibitors, and associated challenges.
• Analysis of the bi-substrate nature of HATs and its impact on inhibitor evaluation.
• Discussion of enzyme kinetics and catalytic mechanisms in the context of HAT inhibition.

Main Results:

• HAT inhibitors face hurdles due to enzyme complex formation and undesired off-target effects.
• The bi-substrate nature of HATs complicates the assessment of inhibitor potency and experimental reproducibility.
• Current inhibitors often lack selectivity and exhibit instability or reactivity.

Conclusions:

• Developing potent and selective HAT inhibitors requires a deeper understanding of HAT molecular mechanisms and enzyme kinetics.
• Addressing challenges in HAT research will facilitate the development of novel therapeutic agents for various diseases.
• Careful characterization of HATs and small molecule inhibitors is essential for advancing drug development.