1. Control of leucine-dependent mTORC1 pathway through chemical intervention of leucyl-tRNA synthetase and RagD interaction
- Author
-
Kim, Jong Hyun, Lee, Chulho, Lee, Minji, Wang, Haipeng, Kim, Kibum, Park, Seung Joon, Yoon, Ina, Jang, Jayun, Zhao, Hanchao, Kim, Hoi Kyoung, Kwon, Nam Hoon, Jeong, Seung Jae, Yoo, Hee Chan, Kim, Jae Hyun, Yang, Jee Sun, Lee, Myeong Youl, Lee, Chang Woo, Yun, Jieun, Oh, Soo Jin, Kang, Jong Soon, Martinis, Susan A, Hwang, Kwang Yeon, Guo, Min, Han, Gyoonhee, Han, Jung Min, and Kim, Sunghoon
- Subjects
Biochemistry and Cell Biology ,Biological Sciences ,Cancer ,Animals ,Antineoplastic Agents ,Cell Line ,Tumor ,Drug Screening Assays ,Antitumor ,Female ,Humans ,Leucine ,Leucine-tRNA Ligase ,Mechanistic Target of Rapamycin Complex 1 ,Mice ,Mice ,Inbred BALB C ,Mice ,Nude ,Monomeric GTP-Binding Proteins ,Neoplasms ,Protein Binding ,Signal Transduction ,Sirolimus - Abstract
Leucyl-tRNA synthetase (LRS) is known to function as leucine sensor in the mammalian target of rapamycin complex 1 (mTORC1) pathway. However, the pathophysiological significance of its activity is not well understood. Here, we demonstrate that the leucine sensor function for mTORC1 activation of LRS can be decoupled from its catalytic activity. We identified compounds that inhibit the leucine-dependent mTORC1 pathway by specifically inhibiting the GTPase activating function of LRS, while not affecting the catalytic activity. For further analysis, we selected one compound, BC-LI-0186, which binds to the RagD interacting site of LRS, thereby inhibiting lysosomal localization of LRS and mTORC1 activity. It also effectively suppressed the activity of cancer-associated MTOR mutants and the growth of rapamycin-resistant cancer cells. These findings suggest new strategies for controlling tumor growth that avoid the resistance to existing mTOR inhibitors resulting from cancer-associated MTOR mutations.Leucyl-tRNA synthetase (LRS) is a leucine sensor of the mTORC1 pathway. Here, the authors identify inhibitors of the GTPase activating function of LRS, not affecting its catalytic activity, and demonstrate that the leucine sensor function of LRS can be a new target for mTORC1 inhibition.
- Published
- 2017