Direct Ras Inhibitors Identified from a Structurally Rigidified Bicyclic Peptide Library
Punit Upadhyaya1, Ziqing Qian1, Nurlaila A A Habir1
1Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18 Avenue, Columbus, Ohio 43210, USA.
Tetrahedron
|October 7, 2014
Summary
Researchers developed a novel library of bicyclic peptides to screen against the K-Ras G12V mutant. This screening identified two distinct classes of Ras ligands, offering potential new tools for cancer research and therapy.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Oncology
Background:
- Oncogenic K-Ras G12V mutations are key drivers in various cancers.
- Targeting Ras proteins remains a significant challenge in cancer therapy.
- Developing novel inhibitors requires innovative screening platforms.
Purpose of the Study:
- To synthesize and screen a one-bead-two-compound (OBTC) library of structurally rigidified bicyclic peptides.
- To identify novel ligands that bind to the oncogenic K-Ras G12V mutant.
- To characterize the binding sites and inhibitory mechanisms of identified ligands.
Main Methods:
- Chemical synthesis of a bicyclic peptide library on TentaGel microbeads.
- Screening the OBTC library against oncogenic K-Ras G12V.
- Characterization of Ras ligand binding and inhibition of Ras-Raf interaction.
Main Results:
- Identification of two distinct classes of Ras ligands from the bicyclic peptide library.
- Class I ligands inhibit the Ras-Raf interaction by binding to the effector-binding site.
- Class II ligand binds to a novel site distinct from the effector-binding site.
Conclusions:
- The developed OBTC library is effective for identifying novel Ras ligands.
- Identified Ras ligands serve as valuable research tools for studying Ras signaling.
- These ligands hold potential for future therapeutic development against K-Ras-driven cancers.
