A sterol-binding protein integrates endosomal lipid metabolism with TOR signaling and nitrogen sensing.

A sterol-binding protein integrates endosomal lipid metabolism with TOR signaling and nitrogen sensing.
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DOI:
10.1016/j.cell.2011.12.026
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发表时间:
2012-02-17
期刊:
影响因子:
64.5
通讯作者:
Bankaitis VA
Bankaitis VA
中科院分区:
生物学1区
文献类型:
--
作者:
Mousley CJ;Yuan P;Gaur NA;Trettin KD;Nile AH;Deminoff SJ;Dewar BJ;Wolpert M;Macdonald JM;Herman PK;Hinnebusch AG;Bankaitis VA

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Kes1, and other oxysterol binding protein (OSBP) superfamily members, are involved in membrane and lipid trafficking through trans-Golgi network (TGN) and endosomal systems. We demonstrate that Kes1 represents a sterol-regulated antagonist of TGN/endosomal phosphatidylinositol-4-phosphate signaling. This regulation modulates TOR activation by amino acids, and dampens gene expression driven by Gcn4; the primary transcriptional activator of the general amino acid control regulon. Kes1-mediated repression of Gcn4 transcription factor activity is characterized by nonproductive Gcn4 binding to its target sequences, involves TGN/endosome-derived sphingolipid signaling, and requires activity of the cyclin-dependent kinase 8 (CDK8) module of the enigmatic ‘large Mediator’ complex. These data describe a pathway by which Kes1 integrates lipid metabolism with TORC1 signaling and nitrogen sensing.
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