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Yang Y, Han YC, Cao Q, Wang X, Wei XD, Shang MD, Zhang XG, Li X, Hu B, Tian CY, Yang ZL, Liu KH, Wang JQ. SPOP negatively regulates mTORC1 activity by ubiquitinating Sec13. Cell Signal 2024; 116:111060. [PMID: 38242269 DOI: 10.1016/j.cellsig.2024.111060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 01/04/2024] [Accepted: 01/16/2024] [Indexed: 01/21/2024]
Abstract
The mammalian target of rapamycin complex1 (mTORC1) can response to amino acid to regulate metabolism and cell growth. GATOR2 act as important role in amino acid mediated mTORC1 signaling pathway by repressing GTPase activity (GAP) of GATOR1. However, it is still unclear how GATOR2 regulates mTORC1 signaling pathway. Here, we found that K63-ubiquitination of Sce13, one component of GATOR2, suppresses the mTORC1 activity by lessening the inter-interaction of GATOR2. Mechanistically, the ubiquitination of Sec13 was mediated by SPOP. Subsequently, the ubiquitination of Sec13 attenuated its interaction with the other component of GATOR2, thus suppressing the activity of mTORC1. Importantly, the deficiency of SPOP promoted the faster proliferation and migration of breast cancer cells, which was attenuated by knocking down of Sec13. Therefore, SPOP can act as a tumor suppressor gene by negatively regulating mTORC1 signaling pathway.
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Affiliation(s)
- Yong Yang
- The First School of Clinical Medicine, Binzhou Medical University, Binzhou, Shandong 256603, China
| | - Yan-Chun Han
- School of Basic Medical, Binzhou Medical University, Yantai, Shandong 264003, China
| | - Qi Cao
- School of Basic Medical, Binzhou Medical University, Yantai, Shandong 264003, China
| | - Xi Wang
- School of Basic Medical, Binzhou Medical University, Yantai, Shandong 264003, China
| | - Xiao-Dan Wei
- School of Basic Medical, Binzhou Medical University, Yantai, Shandong 264003, China
| | - Meng-Di Shang
- Peninsular Cancer Research Center, Binzhou Medical University, Yantai, Shandong 264003, China
| | - Xiao-Gang Zhang
- School of Rehabilitation Medicine, Binzhou Medical University, Yantai, Shandong 264003, China
| | - Xiao Li
- Yantai Medical University Hospital, Binzhou Medical University, Yantai, Shandong 264003, China
| | - Bin Hu
- The First School of Clinical Medicine, Binzhou Medical University, Binzhou, Shandong 256603, China
| | - Cheng-Yang Tian
- The First School of Clinical Medicine, Binzhou Medical University, Binzhou, Shandong 256603, China
| | - Zhen-Lin Yang
- The First School of Clinical Medicine, Binzhou Medical University, Binzhou, Shandong 256603, China.
| | - Ke-Hui Liu
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.
| | - Jiu-Qiang Wang
- Peninsular Cancer Research Center, Binzhou Medical University, Yantai, Shandong 264003, China.
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