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Structural Basis for Long Residence Time c-Src Antagonist: Insights from Molecular Dynamics Simulations
Haiyang Zhong1,2, Zhengshuo Zhang1, Mengdan Chen1
1Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, 209 Tongshan Road, Xuzhou 221004, China.
International Journal of Molecular Sciences
|October 16, 2024
Summary
Developing longer residence time (RT) c-Src inhibitors enhances efficacy. Molecular dynamics revealed that modifying DAS-DFGO-I (DFGO) with a sulfonamide group improved binding stability, offering a strategy for more selective cancer therapeutics.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- c-Src kinase is a key regulator in cellular signaling pathways and a validated therapeutic target in oncology.
- Enhancing drug residence time (RT) is a promising strategy to improve the efficacy and selectivity of kinase inhibitors.
- Developing c-Src antagonists with prolonged RT could lead to improved cancer treatment outcomes.
Purpose of the Study:
- To investigate the binding modes and dissociation mechanisms of c-Src with long and short RT antagonists using molecular dynamics simulations.
- To elucidate the molecular interactions responsible for the long RT of DAS-DFGO-I (DFGO).
- To design and evaluate a novel c-Src inhibitor with enhanced binding stability.
Main Methods:
- Molecular dynamics (MD) simulations were utilized to analyze the binding dynamics of c-Src inhibitors.
- Computational analysis focused on identifying key interactions, including hydrogen bonds and hydrophobic contacts, governing drug-target residence time.
- Structure-activity relationships were explored through chemical modification of lead compounds.
Main Results:
- The long RT compound DAS-DFGO-I (DFGO) binds to an allosteric site on c-Src, forming crucial hydrogen bonds with E310/D404 and hydrophobic interactions with L322/V377.
- The amide group in DFGO formed unstable hydrogen bonds with E310 and D404.
- A modified compound, DFOGS, featuring a sulfonamide substitution, demonstrated stabilized hydrogen bonds with E310/D404, enhancing binding stability with c-Src.
Conclusions:
- The study provides a mechanistic understanding of how specific interactions contribute to the long residence time of c-Src inhibitors.
- Chemical modification of the amide group to a sulfonamide in DFGO significantly enhances binding stability.
- These findings offer a rational design strategy for developing potent and selective long residence time c-Src inhibitors for cancer therapy.
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