Journal article
Pengda Liu, W. Gan, Y. R. Chin, K. Ogura, Jian-ping Guo, Jinfang Zhang, Bin Wang, J. Blenis, L. Cantley, A. Toker, B. Su, Bing Su, Wenyi Wei
Cancer Discovery, 2015
Cancer Discovery, 2015
Semantic Scholar
DOI
PubMed
Cite
Cite
APA
Click to copy
Liu, P., Gan, W., Chin, Y. R., Ogura, K., Guo, J.-ping, Zhang, J., … Wei, W. (2015). PtdIns(3,4,5)P3-Dependent Activation of the mTORC2 Kinase Complex. Cancer Discovery.
Chicago/Turabian
Click to copy
Liu, Pengda, W. Gan, Y. R. Chin, K. Ogura, Jian-ping Guo, Jinfang Zhang, Bin Wang, et al. “PtdIns(3,4,5)P3-Dependent Activation of the mTORC2 Kinase Complex.” Cancer Discovery (2015).
MLA
Click to copy
Liu, Pengda, et al. “PtdIns(3,4,5)P3-Dependent Activation of the mTORC2 Kinase Complex.” Cancer Discovery, 2015.
BibTeX Click to copy
@article{pengda2015a,
title = {PtdIns(3,4,5)P3-Dependent Activation of the mTORC2 Kinase Complex.},
year = {2015},
journal = {Cancer Discovery},
author = {Liu, Pengda and Gan, W. and Chin, Y. R. and Ogura, K. and Guo, Jian-ping and Zhang, Jinfang and Wang, Bin and Blenis, J. and Cantley, L. and Toker, A. and Su, B. and Su, Bing and Wei, Wenyi}
}
Abstract
UNLABELLED mTOR serves as a central regulator of cell growth and metabolism by forming two distinct complexes, mTORC1 and mTORC2. Although mechanisms of mTORC1 activation by growth factors and amino acids have been extensively studied, the upstream regulatory mechanisms leading to mTORC2 activation remain largely elusive. Here, we report that the pleckstrin homology (PH) domain of SIN1, an essential and unique component of mTORC2, interacts with the mTOR kinase domain to suppress mTOR activity. More importantly, PtdIns(3,4,5)P3, but not other PtdInsPn species, interacts with SIN1-PH to release its inhibition on the mTOR kinase domain, thereby triggering mTORC2 activation. Mutating critical SIN1 residues that mediate PtdIns(3,4,5)P3 interaction inactivates mTORC2, whereas mTORC2 activity is pathologically increased by patient-derived mutations in the SIN1-PH domain, promoting cell growth and tumor formation. Together, our study unravels a PI3K-dependent mechanism for mTORC2 activation, allowing mTORC2 to activate AKT in a manner that is regulated temporally and spatially by PtdIns(3,4,5)P3.
SIGNIFICANCE The SIN1-PH domain interacts with the mTOR kinase domain to suppress mTOR activity, and PtdIns(3,4,5)P3 binds the SIN1-PH domain to release its inhibition on the mTOR kinase domain, leading to mTORC2 activation. Cancer patient-derived SIN1-PH domain mutations gain oncogenicity by loss of suppressing mTOR activity as a means to facilitate tumorigenesis.
