PT  - JOURNAL ARTICLE
AU  - Brittany L Dunkerly-Eyring
AU  - Shi Pan
AU  - Miguel Pinilla-Vera
AU  - Desirae McKoy
AU  - Sumita Mishra
AU  - Maria I Grajeda Martinez
AU  - Christian U Oeing
AU  - Mark J Ranek
AU  - David A Kass
TI  - Single serine on TSC2 exerts biased control over mTORC1 activation mediated by ERK1/2 but not Akt
AID  - 10.26508/lsa.202101169
DP  - 2022 Jun 01
TA  - Life Science Alliance
PG  - e202101169
VI  - 5
IP  - 6
4099  - https://www.life-science-alliance.org/content/5/6/e202101169.short
4100  - https://www.life-science-alliance.org/content/5/6/e202101169.full
SO  - Life Sci. Alliance2022 Jun 01; 5
AB  - Tuberous sclerosis complex-2 (TSC2) negatively regulates mammalian target of rapamycin complex 1 (mTORC1), and its activity is reduced by protein kinase B (Akt) and extracellular response kinase (ERK1/2) phosphorylation to activate mTORC1. Serine 1364 (human) on TSC2 bidirectionally modifies mTORC1 activation by pathological growth factors or hemodynamic stress but has no impact on resting activity. We now show this modification biases to ERK1/2 but not Akt-dependent TSC2-mTORC1 activation. Endothelin-1–stimulated mTORC1 requires ERK1/2 activation and is bidirectionally modified by phospho-mimetic (S1364E) or phospho-silenced (S1364A) mutations. However, mTORC1 activation by Akt-dependent stimuli (insulin or PDGF) is unaltered by S1364 modification. Thrombin stimulates both pathways, yet only the ERK1/2 component is modulated by S1364. S1364 also has negligible impact on mTORC1 regulation by energy or nutrient status. In vivo, diet-induced obesity, diabetes, and fatty liver couple to Akt activation and are also unaltered by TSC2 S1364 mutations. This contrasts to prior reports showing a marked impact of both on pathological pressure-stress. Thus, S1364 provides ERK1/2-selective mTORC1 control and a genetic means to modify pathological versus physiological mTOR stimuli.