K-Ras G12C-IN-3

Target: This ligand targets KRAS G12C mutant protein in biochemical or cellular target-engagement studies.

Mechanism of Action: Used as the target-protein recognition element, this ligand provides the binding interface for KRAS G12C mutant protein. In PROTAC design, a derivatizable position on the ligand can be connected through an optimized linker to an E3 ligase ligand, such as a CRBN, VHL, or IAP recruiter, while preserving productive target engagement. The resulting bifunctional molecule brings KRAS G12C mutant protein into proximity with the recruited E3 ligase, enabling ternary-complex formation. If the complex has favorable geometry and residence time, target lysine ubiquitination is promoted, leading to proteasome-dependent degradation in experimental systems.

• PROTAC-Mediated K-Ras Degradation: Use K-Ras G12C-IN-3 as a targeting ligand within PROTAC designs to recruit E3 ligases toward the G12C mutant state. This enables systematic evaluation of ternary complex formation, ubiquitination efficiency, and proteasome-dependent loss of K-Ras, supporting mechanism-of-action studies in Ras-driven signaling contexts.

• E3 Ligase Recruitment Optimization: Incorporate K-Ras G12C-IN-3 into PROTAC scaffolds to compare different E3 ligase recruiters and linker geometries. By tuning spatial orientation and binding kinetics, researchers can map degradation potency versus target engagement, identify effective ternary complex cooperativity, and optimize conditions for robust, selective degradation of G12C-bearing cells.

• Structure-Guided PROTAC Design: Apply structural and biophysical insights from K-Ras G12C-IN-3 binding to design PROTACs with improved compatibility at the mutant pocket. This direction supports rational linker placement, assessment of steric constraints, and refinement of binding modes to enhance ubiquitin transfer and accelerate proteolysis of K-Ras G12C.

• Pathway Suppression Mechanism Studies: Deploy K-Ras G12C-IN-3-based PROTACs to interrogate how selective degradation of mutant K-Ras reshapes downstream signaling. Researchers can correlate degradation kinetics and extent with changes in RAF/MEK/ERK and related pathways, distinguishing degradation-driven effects from occupancy-only outcomes and validating degradation specificity.

K-Ras G12C-IN-3 is a KRAS G12C ligand-like scaffold containing an acrylamide covalent warhead. It may support KRAS G12C-directed degrader design if the warhead remains accessible.

Structure: K-Ras G12C-IN-3 is a KRAS G12C ligand-like scaffold containing a dichlorinated biaryl region, methoxy substituent, piperazine carboxamide, and an acrylamide electrophilic warhead. The acrylamide is the key covalent-reactive feature, while the chlorinated aryl rings provide hydrophobic recognition elements.

Reactivity: For KRAS G12C-directed PROTAC design, the acrylamide warhead should be preserved and not used as the linker attachment point because it is required for covalent cysteine engagement. Linker installation should be explored from the piperazine or amide-associated vector in a designed analog. Alkyl, PEG, amide, carbamate, or piperazine-compatible linkers can be paired with CRBN, VHL, or IAP ligands while maintaining warhead accessibility and KRAS-binding orientation.