A Selectivity Study of FFAR4/FFAR1 Agonists by Molecular Modeling

Area of Science:

• Pharmacology
• Molecular Biology
• Computational Chemistry

Background:

• Free fatty acid receptor 4 (FFAR4) is a therapeutic target for metabolic diseases such as diabetes.
• Biphenyl compounds, including SR13, exhibit notable FFAR4 selectivity.
• The precise molecular mechanisms underlying FFAR4/FFAR1 selectivity remain unclear.

Purpose of the Study:

• To elucidate the protein-ligand interactions governing FFAR4 and FFAR1 selectivity.
• To understand the molecular basis for the selectivity of SR13 towards FFAR4 over FFAR1.
• To guide the design of novel, selective FFAR4 agonists.

Main Methods:

• Molecular modeling and simulation techniques.
• Analysis of protein-ligand interactions.
• Comparison of ligand-binding site accessibility and conformations.

Main Results:

• Key residues involved in FFAR4 and FFAR1 binding were identified, aligning with experimental data.
• SR13's selectivity is attributed to its ability to adopt a specific conformation enabling entry into the FFAR4 binding site.
• A conformational mismatch between SR13 and the FFAR1 entrance region explains its low activity at FFAR1.

Conclusions:

• Molecular modeling provides critical insights into FFAR4/FFAR1 selectivity.
• SR13's preferential conformation dictates its differential activity against FFAR4 and FFAR1.
• These findings support the rational development of selective FFAR4 agonists for metabolic disorders.