GCN2 adapts protein synthesis to scavenging-dependent growth.
GCN2 adapts protein synthesis to scavenging-dependent growth.
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DOI:
10.1016/j.cels.2021.09.014
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发表时间:
2022-02-16
期刊:
影响因子:
9.3
通讯作者:
Rabinowitz JD
中科院分区:
文献类型:
--
作者:
Nofal M;Wang T;Yang L;Jankowski CSR;Hsin-Jung Li S;Han S;Parsons L;Frese AN;Gitai Z;Anthony TG;Wühr M;Sabatini DM;Rabinowitz JD
Pancreatic cancer cells with limited access to free amino acids can grow by scavenging extracellular protein. In a murine model of pancreatic cancer, we performed a genome-wide CRISPR screen for genes required for scavenging-dependent growth. The screen identified key mediators of macropinocytosis, peripheral lysosome positioning, endosome-lysosome fusion, lysosomal protein catabolism, and translational control. The top hit was GCN2, a kinase that suppresses translation initiation upon amino acid depletion. Using isotope tracers, we show that GCN2 is not required for protein scavenging. Instead, GCN2 prevents ribosome stalling but without slowing protein synthesis; cells still use all of the limiting amino acids as they emerge from lysosomes. GCN2 also adapts gene expression to the nutrient-poor environment, reorienting protein synthesis away from ribosomes and toward lysosomal hydrolases, such as cathepsin L. GCN2, cathepsin L, and the other genes identified in the screen are potential therapeutic targets in pancreatic cancer. Pancreatic tumors are nutrient poor. They grow in part by taking up extracellular proteins by macropinocytosis and degrading them in lysosomes. Nofal et al. report the results of a genome-wide screen for scavenging-dependent growth. Beyond macropinocytosis, this mode of growth depends on proper lysosome trafficking, expression of the key lysosomal hydrolase cathepsin L, and regulation of translation by top screen hit GCN2.
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影响因子:
82.9
作者:
Davidson SM;Jonas O;Keibler MA;Hou HW;Luengo A;Mayers JR;Wyckoff J;Del Rosario AM;Whitman M;Chin CR;Condon KJ;Lammers A;Kellersberger KA;Stall BK;Stephanopoulos G;Bar-Sagi D;Han J;Rabinowitz JD;Cima MJ;Langer R;Vander Heiden MG
通讯作者:
Vander Heiden MG
影响因子:
21.3
作者:
通讯作者:
--
影响因子:
16
作者:
Harding, HP;Novoa, I;Ron, D
通讯作者:
Ron, D
影响因子:
9.2
作者:
Chesneau, Laurent;Dambournet, Daphne;Echard, Arnaud
通讯作者:
Echard, Arnaud
DOI:
10.1007/978-1-4939-8784-9_13
发表时间:
2018-01-01
期刊:
XENOPUS: METHODS AND PROTOCOLS
影响因子:
--
作者:
Gupta, Meera;Sonnett, Matthew;Wuhr, Martin
通讯作者:
Wuhr, Martin