The mTOR-regulated phosphoproteome reveals a mechanism of mTORC1-mediated inhibition of growth factor signaling.

The mTOR-regulated phosphoproteome reveals a mechanism of mTORC1-mediated inhibition of growth factor signaling.
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DOI:
10.1126/science.1199498
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发表时间:
2011-06-10
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Sabatini DM
Sabatini DM
中科院分区:
其他
文献类型:
--
作者:
Hsu PP;Kang SA;Rameseder J;Zhang Y;Ottina KA;Lim D;Peterson TR;Choi Y;Gray NS;Yaffe MB;Marto JA;Sabatini DM

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mTOR蛋白激酶是一种主要的生长促进剂,形成两个复合物mTORC1和mTORC2。尽管由mTOR控制的过程多种多样,但已知的底物很少。我们通过定量质谱法定义了mTOR调控的磷酸化蛋白质组,并利用定位扫描肽库表征了mTOR的一级序列基序特异性。我们发现胰岛素的磷酸化反应很大程度上依赖于mTOR,并且mTOR对脯氨酸、疏水和芳香残基在+1位置表现出独特的偏好。接头蛋白Grb10被鉴定为mTORC1底物,介导缺乏TSC2的细胞典型的PI3K抑制,TSC2是肿瘤抑制因子和mTORC1的负调节因子。我们的工作阐明了mTORC1如何抑制生长因子信号传导,并为mTOR生物学开辟了新的研究领域。
The mTOR protein kinase is a master growth promoter that nucleates two complexes, mTORC1 and mTORC2. Despite the diverse processes controlled by mTOR, few substrates are known. We defined the mTOR-regulated phosphoproteome by quantitative mass spectrometry and characterized the primary sequence motif specificity of mTOR using positional scanning peptide libraries. We found that the phosphorylation response to insulin is largely mTOR-dependent and that mTOR exhibits a unique preference for proline, hydrophobic, and aromatic residues at the +1 position. The adaptor protein Grb10 was identified as an mTORC1 substrate that mediates the inhibition of PI3K typical of cells lacking TSC2, a tumor suppressor and negative regulator of mTORC1. Our work clarifies how mTORC1 inhibits growth factor signaling and opens new areas of investigation in mTOR biology.
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