Activation of GCN2 by the ribosomal P-stalk
| العنوان: | Activation of GCN2 by the ribosomal P-stalk |
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| المؤلفون: | Sichen Shao, Olga Perisic, Glenn R. Masson, Stephen H. McLaughlin, Roger L. Williams, Alison J. Inglis, Ramanujan S. Hegde |
| المصدر: | Proceedings of the National Academy of Sciences of the United States of America |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | ribosome stalling, Protein subunit, Amino Acid Motifs, Eukaryotic Initiation Factor-2, GTPase, Protein Serine-Threonine Kinases, Ribosome, Biochemistry, 03 medical and health sciences, Structure-Activity Relationship, 0302 clinical medicine, Protein Domains, Integrated stress response, Humans, Phosphorylation, HDX-MS, 030304 developmental biology, P-stalk, 0303 health sciences, Multidisciplinary, Chemistry, Translation (biology), Ribosomal RNA, Biological Sciences, 3. Good health, Cell biology, Elongation factor, PNAS Plus, uL10/P1/P2, Transfer RNA, GCN2, Ribosomes, 030217 neurology & neurosurgery |
| الوصف: | Significance General control nonderepressible 2 (GCN2) phosphorylates eIF2α, regulating translation in response to nutritional stress. Here, we show that although tRNA stimulates purified, recombinant human GCN2 in vitro, mammalian ribosomes are even more potent GCN2 activators. Hydrogen/deuterium exchange–mass spectrometry (HDX-MS) showed GCN2 interacting with domain II of the uL10 P-stalk protein. The P-stalk is a uL10/P12/P22 pentameric complex that is part of the ribosomal GTPase-associated center. Recombinant human P-stalk greatly stimulates GCN2. Both domain II of uL10 and the C-terminal tails of P1 and P2 are necessary for maximal GCN2 activation. On actively translating ribosomes, the C-terminal tails of P1 and P2 are sequestered by elongation factors, suggesting P-stalk availability could link translational stress to GCN2 activation. 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. |
| تدمد: | 1091-6490 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa4a060ead3ca51f8f20d6d7a6f407da https://pubmed.ncbi.nlm.nih.gov/30804176 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....aa4a060ead3ca51f8f20d6d7a6f407da |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10916490 |
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