Structure-Guided Development of NRAS G12D Inhibitors Based on a 5‑Azaindole Core
Joshua B Cox1, Vinay Nair1, Pijus Mandal1
1Institute for Applied Cancer Science (IACS), The University of Texas MD Anderson Cancer Center, 1881 East Road, Houston, Texas 77054, United States.
ACS Medicinal Chemistry Letters
|February 18, 2026
Summary
Researchers developed IACS-56676, a targeted therapy for NRAS G12D mutations found in cancers like melanoma. This selective inhibitor offers a new tool for studying NRAS biology and cancer treatment.
Area of Science:
- Oncology
- Molecular Biology
- Drug Discovery
Background:
- NRAS G12D mutations drive melanoma and hematologic malignancies.
- Targeted therapies for NRAS G12D are currently limited, representing an unmet clinical need.
Purpose of the Study:
- To describe the structure-guided development of IACS-56676, a novel NRAS G12D inhibitor.
- To establish IACS-56676 as a tool compound for NRAS biology research.
- To gain insights into achieving selectivity between NRAS and KRAS proteins.
Main Methods:
- Structure-guided drug design principles were employed.
- Iterative optimization of lead compounds to enhance potency and selectivity.
- Biochemical assays to assess inhibitor activity against NRAS and KRAS variants.
Main Results:
- IACS-56676 was identified as a selective and potent inhibitor of NRAS G12D.
- Key structural modifications, including p-loop stabilization and Leu 95 substitution, were crucial for activity.
- The inhibitor demonstrated selectivity against wild-type KRAS and non-responder variants.
Conclusions:
- IACS-56676 represents a significant advancement in targeting NRAS G12D mutations.
- The compound serves as a valuable tool for further investigation of NRAS-driven oncogenesis.
- The study provides a framework for developing selective RAS inhibitors.
Keywords:
G12D mutantKRAS inhibitorNRASSBDDprecision medicinestructure-based drug designtargeted therapyMore Related Videos
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