Molecular interactions of cinnamyl and quinoxaline derivatives with Bcl-2 antiapoptotic proteins: a computational...

Area of Science:

• Biochemistry
• Computational Chemistry
• Drug Discovery

Background:

• Antiapoptotic proteins like Bcl-2 and Bcl-xl promote cancer cell survival and treatment resistance.
• These proteins are frequently overexpressed in pancreatic cancer, presenting a significant therapeutic challenge.

Purpose of the Study:

• To computationally identify molecular features enabling cinnamyl and quinoxaline derivatives to inhibit Bcl-2 and Bcl-xl protein oligomerization.
• To provide mechanistic insights into the molecular recognition processes of these antiapoptotic proteins.

Main Methods:

• Systematic computational study involving molecular docking and molecular dynamics simulations.
• Analysis of intermolecular interactions using Quantum Theory of Atoms in Molecules (QTAIM).
• Assessment of reactivity descriptors from temperature-dependent chemical reactivity theory.

Main Results:

• Characterization of plausible binding modes and stability of protein-inhibitor complexes.
• Identification of key intermolecular interactions governing inhibitor binding.
• Revealed consistent structural and electronic patterns for effective Bcl-2 and Bcl-xl inhibition.

Conclusions:

• The study provides mechanistic understanding of how small molecules inhibit antiapoptotic proteins.
• Offers practical guidelines for the rational design of new small-molecule inhibitors targeting Bcl-2 and Bcl-xl.
• Aims to improve anticancer therapies by overcoming treatment resistance mediated by antiapoptotic proteins.