Parameters of Reserpine Analogs That Induce MSH2/MSH6-Dependent Cytotoxic Response
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Updated: Jun 8, 2026
Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
Published on: February 9, 2021
Aksana Vasilyeva1, Jill E Clodfelter, Michael J Gorczynski
1Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
Abstract:
Mismatch repair proteins modulate the cytotoxicity of several chemotherapeutic agents. We have recently proposed a "death conformation" of the MutS homologous proteins that is distinguishable from their "repair conformation." This conformation can be induced by a small molecule, reserpine, leading to DNA-independent cell death. We investigated the parameters for a small reserpine-like molecule that are required to interact with MSH2/MSH6 to induce MSH2/MSH6-dependent cytotoxic response. A multidisciplinary approach involving structural modeling, chemical synthesis, and cell biology analyzed reserpine analogs and modifications. We demonstrate that the parameters controlling the induction of MSH2/MSH6-dependent cytotoxicity for reserpine-analogous molecules reside in the specific requirements for methoxy groups, the size of the molecule, and the orientation of molecules within the protein-binding pocket. Reserpine analog rescinnamine showed improved MSH2-dependent cytotoxicity. These results have important implications for the identification of compounds that require functional MMR proteins to exhibit their full cytotoxicity, which will avoid resistance in MMR-deficient cells.
Insights
Researchers identified key molecular features of reserpine analogs that induce MSH2/MSH6-dependent cell death. This discovery helps in developing chemotherapy drugs that bypass resistance in mismatch repair-deficient cells.
Area of Science:
- Molecular biology
- Medicinal chemistry
- Cancer research
Background:
- Mismatch repair (MMR) proteins influence chemotherapy efficacy.
- A novel "death conformation" of MutS homologous proteins, distinct from their repair function, can induce DNA-independent cell death.
- Reserpine can trigger this death conformation.
Purpose of the Study:
- To identify structural and chemical parameters of reserpine-like molecules required for MSH2/MSH6-dependent cytotoxicity.
- To understand the interaction of reserpine analogs with MSH2/MSH6 proteins.
Main Methods:
- Multidisciplinary approach combining structural modeling, chemical synthesis, and cell biology.
- Analysis of reserpine analogs and modifications.
- Investigation of MSH2/MSH6 protein interactions.
Main Results:
- Specific molecular features, including methoxy groups, molecular size, and binding orientation, are critical for inducing MSH2/MSH6-dependent cytotoxicity.
- The reserpine analog, rescinnamine, demonstrated enhanced MSH2-dependent cytotoxicity.
- Identified key parameters for reserpine-analogous molecule interaction with MSH2/MSH6.
Conclusions:
- The study elucidates the molecular basis for MSH2/MSH6-dependent cytotoxicity induced by reserpine analogs.
- Findings facilitate the development of novel chemotherapeutic agents that require functional MMR proteins.
- This approach may help overcome resistance in MMR-deficient cancers.
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