Activation of GCN2 by the ribosomal P-stalk.

Proceedings of the National Academy of Sciences of the United States of America
Alison J InglisRoger L Williams

Abstract

Cells dynamically adjust their protein translation profile to maintain homeostasis in changing environments. During nutrient stress, the kinase general control nonderepressible 2 (GCN2) phosphorylates translation initiation factor eIF2α, initiating the integrated stress response (ISR). To examine the mechanism of GCN2 activation, we have reconstituted this process in vitro, using purified components. We find that recombinant human GCN2 is potently stimulated by ribosomes and, to a lesser extent, by tRNA. Hydrogen/deuterium exchange-mass spectrometry (HDX-MS) mapped GCN2-ribosome interactions to domain II of the uL10 subunit of the ribosomal P-stalk. Using recombinant, purified P-stalk, we showed that this domain of uL10 is the principal component of binding to GCN2; however, the conserved 14-residue C-terminal tails (CTTs) in the P1 and P2 P-stalk proteins are also essential for GCN2 activation. The HisRS-like and kinase domains of GCN2 show conformational changes upon binding recombinant P-stalk complex. Given that the ribosomal P-stalk stimulates the GTPase activity of elongation factors during translation, we propose that the P-stalk could link GCN2 activation to translational stress, leading to initiation of ISR.

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Citations

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Jul 17, 2020·Frontiers in Plant Science·Federico Martinez-SeidelJoachim Kopka
Jul 14, 2020·Wiley Interdisciplinary Reviews. RNA·Clare M MillerGabriele Fuchs
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Apr 8, 2020·Proceedings of the National Academy of Sciences of the United States of America·Yeonjin KimTracy L Keller
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Methods Mentioned

BETA
GTPases
GTPase
light scattering
gel filtration
Pulldown
Pulldowns
chip
Assay

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