Conformational Selection Mechanism Provides Structural Insights into the Optimization of APC-Asef Inhibitors

Area of Science:

• Oncology
• Molecular Biology
• Computational Chemistry

Background:

• Colorectal cancer metastasis is a primary cause of mortality.
• Inhibiting the adenomatous polyposis coli (APC) and Rho guanine nucleotide exchange factor 4 (Asef) interaction shows promise in restraining metastasis.
• Current inhibitors lack sufficient in vivo efficacy, necessitating optimization.

Purpose of the Study:

• To elucidate the detailed mechanism of APC-Asef inhibition using molecular dynamics (MD) simulations.
• To provide insights for optimizing existing inhibitors and designing novel peptide-based drugs.
• To understand the conformation selection mechanism underlying APC-Asef inhibition.

Main Methods:

• Applied molecular dynamics (MD) simulations to apo and holo APC systems.
• Conducted extensive analyses of simulation trajectories, including representative structure identification and stability/dynamic property evaluation.
• Performed binding free energy analysis to identify key interface residues.

Main Results:

• MD simulations revealed that apo APC adopts diverse conformations, and inhibitors selectively stabilize specific conformations.
• Identified specific APC-ligand interactions crucial for the binding process.
• Binding free energy analysis quantitatively confirmed key interface residues involved in inhibition.

Conclusions:

• Elucidated the conformation selection mechanism in APC-Asef inhibition.
• Provided critical insights into the rational design of peptide-based drugs targeting APC-Asef interaction.
• Demonstrated the potential for optimizing inhibitors to improve in vivo efficacy against colorectal cancer metastasis.