Mutations in LZTR1 drive human disease by dysregulating RAS ubiquitination

M. Steklov, S. Pandolfi, M. F. Baietti, A. Batiuk, P. Carai, P. Najm, M. Zhang, H. Jang, F. Renzi, Y. Cai, L. Abbasi Asbagh, T. Pastor, M. De Troyer, M. Simicek, E. Radaelli, H. Brems, E. Legius, J. Tavernier, K. Gevaert, F. ImpensL. Messiaen, R. Nussinov, S. Heymans, S. Eyckerman, A. A. Sablina*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The leucine zipper–like transcriptional regulator 1 (LZTR1) protein, an adaptor for cullin 3 (CUL3) ubiquitin ligase complex, is implicated in human disease, yet its mechanism of action remains unknown. We found that Lztr1 haploinsufficiency in mice recapitulates Noonan syndrome phenotypes, whereas LZTR1 loss in Schwann cells drives dedifferentiation and proliferation. By trapping LZTR1 complexes from intact mammalian cells, we identified the guanosine triphosphatase RAS as a substrate for the LZTR1-CUL3 complex. Ubiquitome analysis showed that loss of Lztr1 abrogated Ras ubiquitination at lysine-170. LZTR1-mediated ubiquitination inhibited RAS signaling by attenuating its association with the membrane. Disease-associated LZTR1 mutations disrupted either LZTR1-CUL3 complex formation or its interaction with RAS proteins. RAS regulation by LZTR1-mediated ubiquitination provides an explanation for the role of LZTR1 in human disease.

Original languageEnglish
Pages (from-to)1177-1182
Number of pages6
Issue number6419
StatePublished - 7 Dec 2018


FundersFunder number
National Cancer InstituteZIABC010440
H2020 European Research Council
Fonds Wetenschappelijk Onderzoek


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