Distinct recruitment of human eIF4E isoforms to processing bodies and stress granules

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F16%3A10332347" target="_blank" >RIV/00216208:11310/16:10332347 - isvavai.cz</a>

Result on the web

<a href="http://bmcmolbiol.biomedcentral.com/articles/10.1186/s12867-016-0072-x" target="_blank" >http://bmcmolbiol.biomedcentral.com/articles/10.1186/s12867-016-0072-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1186/s12867-016-0072-x" target="_blank" >10.1186/s12867-016-0072-x</a>

Result language

angličtina

Original language name

Distinct recruitment of human eIF4E isoforms to processing bodies and stress granules

Original language description

Eukaryotic translation initiation factor 4E (eIF4E) plays a pivotal role in the control of cap-dependent translation initiation, occurs in processing bodies (PBs) and is required for formation of stress granules (SGs). In this study, we focused on the subcellular localization of a representative compendium of eIF4E protein isoforms, particularly on the less studied members of the human eIF4E protein family, eIF4E2 and eIF4E3. We showed that unlike eIF4E1, its less studied isoform eIF4E3_A, localized to SGs but not PBs upon both heat shock and arsenite stress. Furthermore, we found that eIF4E3_A interacts with human translation initiation factors eIF4G1, eIF4G3 and PABP1 in vivo and sediments into the same fractions as canonical eIF4E1 during polysome analysis in sucrose gradients. Contrary to this finding, the truncated human eIF4E3 isoform, eIF4E3_B, showed no localization to SGs and no binding to eIF4G. We also highlighted that eIF4E2 may exhibit distinct functions under different stresses as it readily localizes to PBs during arsenite and heat stresses, whereas to SGs, it is redirected only upon the heat shock. We extended our study to a number of protein variants of each of the three eIF4E isoforms. Our results surprisingly uncovered differences in the ability of eIF4E1_1 and eIF4E1_3 to form SGs in response to cellular stresses. Our comparison of all three human eIF4E isoforms and their protein variants enrich the intriguing spectrum of roles attributed to the eukaryotic initiation translation factors of the 4E family. The localization of eIF4E3_A to SGs, but not to PBs, together with its binding to eIF4G and PABP1 suggests a role of eIF4E3_A in translation initiation in human cells. The localization of eIF4E2 to SGs under the condition of heat shock but not during arsenite stress indicates its distinct function in cellular response to these stresses and points to the variable protein content of SGs as a consequence of different stress insults.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

EB - Genetics and molecular biology

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

BMC Molecular Biology

ISSN

1471-2199

e-ISSN

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Volume of the periodical

17

Issue of the periodical within the volume

AUG 30 2016

Country of publishing house

GB - UNITED KINGDOM

Number of pages

19

Pages from-to

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UT code for WoS article

000382814100002

EID of the result in the Scopus database

2-s2.0-84984602118