Gene interactions and pathways from curated databases and text-mining
J Biol Chem 2013, PMID: 23184952

Mechanistic target of rapamycin complex 1 (mTORC1)-mediated phosphorylation is governed by competition between substrates for interaction with raptor.

Dennis, Michael D; Kimball, Scot R; Jefferson, Leonard S

In this study, the interaction of mTORC1 with its downstream targets p70S6K1 and 4E-BP1 was evaluated in both mouse liver and mouse embryonic fibroblasts following combined disruption of the genes encoding 4E-BP1 and 4E-BP2. Phosphorylation of p70S6K1 was dramatically elevated in the livers of mice lacking 4E-BP1 and 4E-BP2 following feeding-induced activation of mTORC1. Immunoprecipitation of mTORC1 suggested that elevated phosphorylation was the result of enhanced interaction of p70S6K1 with raptor. These findings were extended to a cell culture system wherein loss of 4E-BP1 and 4E-BP2 resulted in elevated interaction of p70S6K1 with IGF1-induced activation of mTORC1 in conjunction with an enhanced rate of p70S6K1 phosphorylation at Thr-389. Furthermore, cotransfecting HA-p70S6K1 with 4E-BP1, but not 4E-BP1(F114A), reduced recovery of mTORC1 in HA-p70S6K1 immunoprecipitates. Together, these findings support the conclusion that, in the absence of 4E-BP proteins, mTORC1-mediated phosphorylation of p70S6K1 is elevated by a reduction in competition between the two substrates for interaction with raptor.

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Text Mining Data

p70S6K1 ⊣ 4E-BP1: " These findings were extended to a cell culture system wherein loss of 4E-BP1 and 4E-BP2 resulted in elevated interaction of p70S6K1 with IGF1 induced activation of mTORC1 in conjunction with an enhanced rate of p70S6K1 phosphorylation at Thr-389 "

p70S6K1 ⊣ 4E-BP2: " These findings were extended to a cell culture system wherein loss of 4E-BP1 and 4E-BP2 resulted in elevated interaction of p70S6K1 with IGF1 induced activation of mTORC1 in conjunction with an enhanced rate of p70S6K1 phosphorylation at Thr-389 "

p70S6K1 ⊣ 4E-BP1: " These findings were extended to a cell culture system wherein loss of 4E-BP1 and 4E-BP2 resulted in elevated interaction of p70S6K1 with IGF1 induced activation of mTORC1 in conjunction with an enhanced rate of p70S6K1 phosphorylation at Thr-389 "

p70S6K1 ⊣ 4E-BP2: " These findings were extended to a cell culture system wherein loss of 4E-BP1 and 4E-BP2 resulted in elevated interaction of p70S6K1 with IGF1 induced activation of mTORC1 in conjunction with an enhanced rate of p70S6K1 phosphorylation at Thr-389 "

mTORC1 → IGF1: " These findings were extended to a cell culture system wherein loss of 4E-BP1 and 4E-BP2 resulted in elevated interaction of p70S6K1 with IGF1 induced activation of mTORC1 in conjunction with an enhanced rate of p70S6K1 phosphorylation at Thr-389 "

p70S6K1 → mTORC1: " Together, these findings support the conclusion that, in the absence of 4E-BP proteins, mTORC1 mediated phosphorylation of p70S6K1 is elevated by a reduction in competition between the two substrates for interaction with raptor "

p70S6K1 → mTORC1: " Together, these findings support the conclusion that, in the absence of 4E-BP proteins, mTORC1 mediated phosphorylation of p70S6K1 is elevated by a reduction in competition between the two substrates for interaction with raptor "

Manually curated Databases

No curated data.