Binding Modes of Xanthine-Derived Selective Allosteric Site Inhibitors of MTHFD2

Area of Science:

• Biochemistry
• Molecular Biology
• Computational Chemistry

Background:

• Methylenetetrahydrofolate dehydrogenase (MTHFD2) is a key mitochondrial enzyme in one-carbon metabolism.
• MTHFD2 is upregulated in cancer cells but absent in normal proliferating cells, making it a promising cancer target.
• Xanthine derivatives represent the first class of selective MTHFD2 inhibitors, targeting its allosteric site.

Purpose of the Study:

• To investigate the binding modes and interactions of xanthine derivatives with MTHFD2 using computational methods.
• To understand the selectivity of these inhibitors for MTHFD2 over its homolog MTHFD1.
• To provide insights for the rational design of novel, selective MTHFD2 allosteric inhibitors.

Main Methods:

• Molecular and induced-fit docking simulations.
• MM-GBSA binding free energy calculations.
• Molecular dynamics (MD) simulations and RMSF analyses.

Main Results:

• Detailed analysis of binding modes and key interactions between xanthine derivatives and MTHFD2.
• Correlation of in silico findings with experimental binding affinities, biological activities, and MTHFD2 selectivity.
• Confirmation of conformational changes in MTHFD2 upon inhibitor binding through MD simulations.

Conclusions:

• The computational protocol effectively elucidates the mechanism of selective MTHFD2 inhibition by xanthine derivatives.
• Understanding these interactions is crucial for the rational design of potent and selective MTHFD2 allosteric inhibitors for cancer therapy.
• This study provides a foundation for developing new anti-cancer agents targeting MTHFD2.