Journal: bioRxiv
Article Title: LYMTACs: Chimeric Small Molecules Repurpose Lysosomal Membrane Proteins for Target Protein Relocalization and Degradation
doi: 10.1101/2024.09.08.611923
Figure Lengend Snippet: A) Schematic of complex formation between KRAS G12D and MTH1-RNF152 in the presence of KRAS-targeting LYMTAC. B) Structures of the pan-KRAS inhibitor and PROTAC C) Structures of LYMTAC-3 and LYMTAC-4. D) HiBiT cellular degradation assay in FLAG-MTH1-RNF152-stably expressing, knock-in HCT116 (HiBiT-FKBP12 F36V -KRAS G12D ) cells. Cells were treated with indicated doses of compounds for 24 h and subjected to Nano-Glo® HiBiT lytic assay. Data are representative of three independent experiments, reported as the mean ± S.E. E) Ternary complex formation assay, AsPC-1 cells stably expressing FLAG-MTH1-RNF152 were pre-treated with BafA1 for 30 min, followed by co-treatment with DMSO or 1 µM LYMTAC-3 or LYMTAC-4 for 4 h and subjected to immunoprecipitation with anti-FLAG antibody. Whole cell lysate was used as INPUT. The respective blots are probed with KRAS, MTH1, and vinculin antibodies. Data are representative of two independent experiments. F) AsPC-1 cells stably expressing FLAG-MTH1-RNF152 were treated with DMSO or 100 nM of the indicated compounds for 24 h and subjected to immunoblotting with KRAS, pERK, ERK, and vinculin antibodies. Data are representative of three independent experiments. G) AsPC-1 cells stably expressing FLAG-MTH1-RNF152 were treated with 100 nM KRAS inhibitor, 100 nM PROTAC, or 100 nM LYMTAC-4 for 6 h. For control experiments with LYMTAC-4, cells were pretreated with MTH1-ligand or BafA1 for 30 min, followed by co-treatment in the absence or presence of 100 nM LYMTAC-4 for 6 h, and subjected to immunoblotting with KRAS, p-ERK, ERK, and vinculin antibodies. Data are representative of two independent experiments. H) HEK293T cells stably expressing HiBiT-FKBP12-KRAS G12D and FLAG-MTH1-RNF152 were pre-treated with 1 µM TAK-243 for 30 min followed by DMSO or 1 µM LYMTAC-2 treatment for 6 h. The respective blots are probed with KRAS, p-ERK, ERK, and tubulin antibodies. Data are representative of two independent experiments.
Article Snippet: Antibodies against MTH1 (43918), FLAG (14793), Vinculin (13901), Tubulin (2144), pERK (9101), ERK (4695), PTK2 (3285), EPHA2 (6997), HA (3724), LAMP1(15665), and GAPDH (2118) were purchased from Cell Signaling Technology.
Techniques: Degradation Assay, Stable Transfection, Expressing, Knock-In, Tube Formation Assay, Immunoprecipitation, Western Blot, Control