An Autoinhibited Noncanonical Mechanism of GTP Hydrolysis by Rheb Maintains mTORC1 Homeostasis.
Mazhab-Jafari, M.T., Marshall, C.B., Ishiyama, N., Ho, J., Di Palma, V., Stambolic, V., Ikura, M.(2012) Structure 20: 1528-1539
- PubMed: 22819219 
- DOI: 10.1016/j.str.2012.06.013
- Primary Citation of Related Structures:  
3SEA - PubMed Abstract: 
Rheb, an activator of mammalian target of rapamycin (mTOR), displays low intrinsic GTPase activity favoring the biologically activated, GTP-bound state. We identified a Rheb mutation (Y35A) that increases its intrinsic nucleotide hydrolysis activity ∼10-fold, and solved structures of both its active and inactive forms, revealing an unexpected mechanism of GTP hydrolysis involving Asp65 in switch II and Thr38 in switch I ...