Download MendeleySubstrate specificity of TOR complex 2 is determined by a ubiquitin-fold domain of the Sin1 subunit.
Tatebe, H., Murayama, S., Yonekura, T., Hatano, T., Richter, D., Furuya, T., Kataoka, S., Furuita, K., Kojima, C., Shiozaki, K.(2017) Elife 6
- PubMed: 28264193
- DOI: https://doi.org/10.7554/eLife.19594
- Primary Citation of Related Structures:
2RVK - PubMed Abstract:
The target of rapamycin (TOR) protein kinase forms multi-subunit TOR complex 1 (TORC1) and TOR complex 2 (TORC2), which exhibit distinct substrate specificities. Sin1 is one of the TORC2-specific subunit essential for phosphorylation and activation of certain AGC-family kinases. Here, we show that Sin1 is dispensable for the catalytic activity of TORC2, but its conserved region in the middle (Sin1CRIM) forms a discrete domain that specifically binds the TORC2 substrate kinases. Sin1CRIM fused to a different TORC2 subunit can recruit the TORC2 substrate Gad8 for phosphorylation even in the sin1 null mutant of fission yeast. The solution structure of Sin1CRIM shows a ubiquitin-like fold with a characteristic acidic loop, which is essential for interaction with the TORC2 substrates. The specific substrate-recognition function is conserved in human Sin1CRIM, which may represent a potential target for novel anticancer drugs that prevent activation of the mTORC2 substrates such as AKT.
Organizational Affiliation:
Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara, Japan.
