Two-site phosphorylation of EPRS coordinates multimodal regulation of noncanonical translational control activity.

Two-site phosphorylation of EPRS coordinates multimodal regulation of noncanonical translational control activity.
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DOI:
10.1016/j.molcel.2009.05.028
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发表时间:
2009-07-31
期刊:
影响因子:
16
通讯作者:
Fox, Paul L.
Fox, Paul L.
中科院分区:
生物学1区
文献类型:
--
作者:
Arif, Abul;Jia, Jie;Mukhopadhyay, Rupak;Willard, Belinda;Kinter, Michael;Fox, Paul L.

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Glutamyl-prolyl tRNA synthetase (EPRS) is a component of the heterotetrameric GAIT (Gamma-interferon Activated Inhibitor of Translation) complex that binds 3′UTR GAIT elements in multiple interferon-gamma (IFN-γ)-inducible mRNAs and suppresses their translation. Here we elucidate the specific EPRS phosphorylation events that regulate GAIT-mediated gene silencing. IFN-γ induces sequential phosphorylation of Ser886 and Ser999 in the non-catalytic linker connecting the synthetase cores. Phosphorylation of both sites is essential for EPRS release from the parent tRNA multisynthetase complex. Ser886 phosphorylation is required for the interaction of NSAP1, which blocks EPRS binding to target mRNAs. The same phosphorylation event induces subsequent binding of ribosomal protein L13a and GAPDH, and restores mRNA binding. Finally, Ser999 phosphorylation directs the formation of a functional GAIT complex that binds initiation factor eIF4G and represses translation. Thus, two-site phosphorylation provides structural and functional pliability to EPRS, and choreographs the repertoire of activities that regulates inflammatory gene expression.
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