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Bigenzahn, Johannes W; Collu, Giovanna M; Kartnig, Felix; Pieraks, Melanie; Vladimer, Gregory I; Heinz, Leonhard X; Sedlyarov, Vitaly; Schischlik, Fiorella; Fauster, Astrid; Rebsamen, Manuele; Parapatics, Katja; Blomen, Vincent A; Müller, André C; Winter, Georg E; Kralovics, Robert; Brummelkamp, Thijn R; Mlodzik, Marek; Superti-Furga, Giulio
Science, 12/2018, Letnik: 362, Številka: 6419Journal Article
In genetic screens aimed at understanding drug resistance mechanisms in chronic myeloid leukemia cells, inactivation of the cullin 3 adapter protein-encoding leucine zipper-like transcription regulator 1 ( ) gene led to enhanced mitogen-activated protein kinase (MAPK) pathway activity and reduced sensitivity to tyrosine kinase inhibitors. Knockdown of the ortholog resulted in a Ras-dependent gain-of-function phenotype. Endogenous human LZTR1 associates with the main RAS isoforms. Inactivation of led to decreased ubiquitination and enhanced plasma membrane localization of endogenous KRAS (V-Ki-ras2 Kirsten rat sarcoma viral oncogene homolog). We propose that LZTR1 acts as a conserved regulator of RAS ubiquitination and MAPK pathway activation. Because disease mutations failed to revert loss-of-function phenotypes, our findings provide a molecular rationale for involvement in a variety of inherited and acquired human disorders.
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