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The RON receptor tyrosine kinase regulates epithelial cell homeostasis and tumorigenesis by transducing multiple signals through its functional domains. The present study was to determine the significance of the entire C-terminus in RON or its variant RON160-mediated activities related to cell motility and tumorigenesis. Analysis of protein phosphorylation revealed that elimination of the entire C-terminus significantly impairs the ligand-dependent or independent RON or RON160 phosphorylation and dimerization. Phosphorylation of downstream signaling proteins such as Erk1/2, AKT, and p38 MAP kinase was also diminished in cells expressing the C-terminus-free RON or RON160. These dysfunctional activities were accompanied with the inability of truncated RON or RON160 to mediate cytoplasmic β-catenin accumulation. Functional analysis further demonstrated that truncation of the C-terminus significantly impairs RON or RON160-mediated cell proliferation, morphological changes, and cellular migration. Significantly, oncogenic RON160-mediated tumor growth in athymic nude mice was lost after the deletion of the C-terminus. Thus, the C-terminus is a critical component of the RON receptor. The entire C-terminus is required for RON or RON160-mediated intracellular signaling events leading to various cellular activities.

Significance of the entire C-terminus in biological activities mediated by the RON receptor tyrosine kinase and its oncogenic variant RON160