Understanding the Boron-Nitrogen Interaction and Its Possible Implications in Drug Design

Area of Science:

• Biochemistry
• Molecular Biology
• Computational Chemistry

Background:

• 2-Aminoethoxydiphenylborate (2-APB) is a known modulator of membrane proteins.
• It exhibits concentration-dependent effects on calcium signaling via store-operated calcium (SOC) channels.

Purpose of the Study:

• To investigate the molecular mechanisms behind the dual functionality of 2-APB on SOC channels.
• To explore the relationship between 2-APB's isomeric forms and its biological activity.

Main Methods:

• Ab initio quantum chemical calculations were employed to determine the relative stability of 2-APB isomers.
• Analysis of intramolecular forces, including boron-nitrogen coordinate bonds and ring strain, was performed.

Main Results:

• Two major isomers of 2-APB (cyclic and extended) were identified with a relative stability of approximately 8 kcal/mol.
• The dual action of 2-APB on SOC channels is attributed to its ability to switch between isomeric forms, interacting with different binding sites.
• The stability of these isomers arises from a balance between a boron-nitrogen coordinate bond and ring strain.

Conclusions:

• The isomeric flexibility and moderate stability of 2-APB are key to its dual modulation of SOC channels.
• These properties suggest that 2-APB has potential as a dual-acting therapeutic agent.