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Fusel Alcohols Regulate Translation Initiation by Inhibiting eIF2B to Reduce Ternary Complex in a Mechanism That May Involve Altering the Integrity and Dynamics of the eIF2B Body

Recycling of eIF2-GDP to the GTP-bound form constitutes a core essential, regulated step in eukaryotic translation. This reaction is mediated by eIF2B, a heteropentameric factor with important links to human disease. eIF2 in the GTP-bound form binds to methionyl initiator tRNA to form a ternary comp...

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Autores principales: Taylor, Eleanor J., Campbell, Susan G., Griffiths, Christian D., Reid, Peter J., Slaven, John W., Harrison, Richard J., Sims, Paul F.G., Pavitt, Graham D., Delneri, Daniela, Ashe, Mark P.
Formato: Texto
Lenguaje:English
Publicado: The American Society for Cell Biology 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2893985/
https://www.ncbi.nlm.nih.gov/pubmed/20444979
http://dx.doi.org/10.1091/mbc.E09-11-0962
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author Taylor, Eleanor J.
Campbell, Susan G.
Griffiths, Christian D.
Reid, Peter J.
Slaven, John W.
Harrison, Richard J.
Sims, Paul F.G.
Pavitt, Graham D.
Delneri, Daniela
Ashe, Mark P.
author_facet Taylor, Eleanor J.
Campbell, Susan G.
Griffiths, Christian D.
Reid, Peter J.
Slaven, John W.
Harrison, Richard J.
Sims, Paul F.G.
Pavitt, Graham D.
Delneri, Daniela
Ashe, Mark P.
author_sort Taylor, Eleanor J.
collection PubMed
description Recycling of eIF2-GDP to the GTP-bound form constitutes a core essential, regulated step in eukaryotic translation. This reaction is mediated by eIF2B, a heteropentameric factor with important links to human disease. eIF2 in the GTP-bound form binds to methionyl initiator tRNA to form a ternary complex, and the levels of this ternary complex can be a critical determinant of the rate of protein synthesis. Here we show that eIF2B serves as the target for translation inhibition by various fusel alcohols in yeast. Fusel alcohols are endpoint metabolites from amino acid catabolism, which signal nitrogen scarcity. We show that the inhibition of eIF2B leads to reduced ternary complex levels and that different eIF2B subunit mutants alter fusel alcohol sensitivity. A DNA tiling array strategy was developed that overcame difficulties in the identification of these mutants where the phenotypic distinctions were too subtle for classical complementation cloning. Fusel alcohols also lead to eIF2α dephosphorylation in a Sit4p-dependent manner. In yeast, eIF2B occupies a large cytoplasmic body where guanine nucleotide exchange on eIF2 can occur and be regulated. Fusel alcohols impact on both the movement and dynamics of this 2B body. Overall, these results confirm that the guanine nucleotide exchange factor, eIF2B, is targeted by fusel alcohols. Moreover, they highlight a potential connection between the movement or integrity of the 2B body and eIF2B regulation.
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spelling pubmed-28939852010-09-16 Fusel Alcohols Regulate Translation Initiation by Inhibiting eIF2B to Reduce Ternary Complex in a Mechanism That May Involve Altering the Integrity and Dynamics of the eIF2B Body Taylor, Eleanor J. Campbell, Susan G. Griffiths, Christian D. Reid, Peter J. Slaven, John W. Harrison, Richard J. Sims, Paul F.G. Pavitt, Graham D. Delneri, Daniela Ashe, Mark P. Mol Biol Cell Articles Recycling of eIF2-GDP to the GTP-bound form constitutes a core essential, regulated step in eukaryotic translation. This reaction is mediated by eIF2B, a heteropentameric factor with important links to human disease. eIF2 in the GTP-bound form binds to methionyl initiator tRNA to form a ternary complex, and the levels of this ternary complex can be a critical determinant of the rate of protein synthesis. Here we show that eIF2B serves as the target for translation inhibition by various fusel alcohols in yeast. Fusel alcohols are endpoint metabolites from amino acid catabolism, which signal nitrogen scarcity. We show that the inhibition of eIF2B leads to reduced ternary complex levels and that different eIF2B subunit mutants alter fusel alcohol sensitivity. A DNA tiling array strategy was developed that overcame difficulties in the identification of these mutants where the phenotypic distinctions were too subtle for classical complementation cloning. Fusel alcohols also lead to eIF2α dephosphorylation in a Sit4p-dependent manner. In yeast, eIF2B occupies a large cytoplasmic body where guanine nucleotide exchange on eIF2 can occur and be regulated. Fusel alcohols impact on both the movement and dynamics of this 2B body. Overall, these results confirm that the guanine nucleotide exchange factor, eIF2B, is targeted by fusel alcohols. Moreover, they highlight a potential connection between the movement or integrity of the 2B body and eIF2B regulation. The American Society for Cell Biology 2010-07-01 /pmc/articles/PMC2893985/ /pubmed/20444979 http://dx.doi.org/10.1091/mbc.E09-11-0962 Text en © 2010 by The American Society for Cell Biology
spellingShingle Articles
Taylor, Eleanor J.
Campbell, Susan G.
Griffiths, Christian D.
Reid, Peter J.
Slaven, John W.
Harrison, Richard J.
Sims, Paul F.G.
Pavitt, Graham D.
Delneri, Daniela
Ashe, Mark P.
Fusel Alcohols Regulate Translation Initiation by Inhibiting eIF2B to Reduce Ternary Complex in a Mechanism That May Involve Altering the Integrity and Dynamics of the eIF2B Body
title Fusel Alcohols Regulate Translation Initiation by Inhibiting eIF2B to Reduce Ternary Complex in a Mechanism That May Involve Altering the Integrity and Dynamics of the eIF2B Body
title_full Fusel Alcohols Regulate Translation Initiation by Inhibiting eIF2B to Reduce Ternary Complex in a Mechanism That May Involve Altering the Integrity and Dynamics of the eIF2B Body
title_fullStr Fusel Alcohols Regulate Translation Initiation by Inhibiting eIF2B to Reduce Ternary Complex in a Mechanism That May Involve Altering the Integrity and Dynamics of the eIF2B Body
title_full_unstemmed Fusel Alcohols Regulate Translation Initiation by Inhibiting eIF2B to Reduce Ternary Complex in a Mechanism That May Involve Altering the Integrity and Dynamics of the eIF2B Body
title_short Fusel Alcohols Regulate Translation Initiation by Inhibiting eIF2B to Reduce Ternary Complex in a Mechanism That May Involve Altering the Integrity and Dynamics of the eIF2B Body
title_sort fusel alcohols regulate translation initiation by inhibiting eif2b to reduce ternary complex in a mechanism that may involve altering the integrity and dynamics of the eif2b body
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2893985/
https://www.ncbi.nlm.nih.gov/pubmed/20444979
http://dx.doi.org/10.1091/mbc.E09-11-0962
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