Dynamic adipocyte phosphoproteome reveals that Akt directly regulates mTORC2.

Dynamic adipocyte phosphoproteome reveals that Akt directly regulates mTORC2.
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DOI:
10.1016/j.cmet.2013.04.010
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发表时间:
2013-06-04
期刊:
影响因子:
29
通讯作者:
James DE
James DE
中科院分区:
生物学1区
文献类型:
--
作者:
Humphrey SJ;Yang G;Yang P;Fazakerley DJ;Stöckli J;Yang JY;James DE

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A major challenge of the post-genomics era is to define the connectivity of protein phosphorylation networks. Here, we quantitatively delineate the insulin signaling network in adipocytes by high-resolution mass spectrometry-based proteomics. These data reveal the complexity of intracellular protein phosphorylation. We identified 37,248 phosphorylation sites on 5,705 proteins in this single-cell type, with approximately 15% responding to insulin. We integrated these large-scale phosphoproteomics data using a machine learning approach to predict physiological substrates of several diverse insulin-regulated kinases. This led to the identification of an Akt substrate, SIN1, a core component of the mTORC2 complex. The phosphorylation of SIN1 by Akt was found to regulate mTORC2 activity in response to growth factors, revealing topological insights into the Akt/mTOR signaling network. The dynamic phosphoproteome described here contains numerous phosphorylation sites on proteins involved in diverse molecular functions and should serve as a useful functional resource for cell biologists. MS/MS identified >37,000 phosphorylation sites in adipocytes Insulin regulates the phosphoproteome over a wide temporal timescale Akt phosphorylates SIN1 on T86 in response to insulin SIN1 phosphorylation activates a positive feedback loop between Akt and mTORC2
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