1
|
Bchini R, Girardet JM, Sormani R, Gelhaye E, Morel-Rouhier M. Oxidized glutathione promotes association between eukaryotic translation elongation factor 1Bγ and Ure2p glutathione transferase from Phanerochaete chrysosporium. FEBS J 2020; 288:2956-2969. [PMID: 33124131 DOI: 10.1111/febs.15614] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 09/10/2020] [Accepted: 10/27/2020] [Indexed: 11/27/2022]
Abstract
The eukaryotic translation elongation factor 1Bγ (eEF1Bγ) is an atypical member of the glutathione transferase (GST) superfamily. Contrary to more classical GSTs having a role in toxic compound detoxification, eEF1Bγ is suggested to act as a scaffold protein, anchoring the elongation factor complex EF1B to the endoplasmic reticulum. In this study, we show that eEF1Bγ from the basidiomycete Phanerochaete chrysosporium is fully active as a glutathione transferase in vitro and undergoes conformational changes upon binding of oxidized glutathione. Using real-time analyses of biomolecular interactions, we show that GSSG allows eEF1Bγ to physically interact with other GSTs from the Ure2p class, opening new perspectives for a better understanding of the role of eEF1Bγ in cellular oxidative stress response.
Collapse
|
2
|
Pisani C, Onori A, Gabanella F, Delle Monache F, Borreca A, Ammassari-Teule M, Fanciulli M, Di Certo MG, Passananti C, Corbi N. eEF1Bγ binds the Che-1 and TP53 gene promoters and their transcripts. J Exp Clin Cancer Res 2016; 35:146. [PMID: 27639846 PMCID: PMC5027090 DOI: 10.1186/s13046-016-0424-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 09/10/2016] [Indexed: 11/25/2022] Open
Abstract
Background We have previously shown that the eukaryotic elongation factor subunit 1B gamma (eEF1Bγ) interacts with the RNA polymerase II (pol II) alpha-like subunit “C” (POLR2C), alone or complexed, in the pol II enzyme. Moreover, we demonstrated that eEF1Bγ binds the promoter region and the 3’ UTR mRNA of the vimentin gene. These events contribute to localize the vimentin transcript and consequentially its translation, promoting a proper mitochondrial network. Methods With the intent of identifying additional transcripts that complex with the eEF1Bγ protein, we performed a series of ribonucleoprotein immunoprecipitation (RIP) assays using a mitochondria-enriched heavy membrane (HM) fraction. Results Among the eEF1Bγ complexed transcripts, we found the mRNA encoding the Che-1/AATF multifunctional protein. As reported by other research groups, we found the tumor suppressor p53 transcript complexed with the eEF1Bγ protein. Here, we show for the first time that eEF1Bγ binds not only Che-1 and p53 transcripts but also their promoters. Remarkably, we demonstrate that both the Che-1 transcript and its translated product localize also to the mitochondria and that eEF1Bγ depletion strongly perturbs the mitochondrial network and the correct localization of Che-1. In a doxorubicin (Dox)-induced DNA damage assay we show that eEF1Bγ depletion significantly decreases p53 protein accumulation and slightly impacts on Che-1 accumulation. Importantly, Che-1 and p53 proteins are components of the DNA damage response machinery that maintains genome integrity and prevents tumorigenesis. Conclusions Our data support the notion that eEF1Bγ, besides its canonical role in translation, is an RNA-binding protein and a key player in cellular stress responses. We suggest for eEF1Bγ a role as primordial transcription/translation factor that links fundamental steps from transcription control to local translation. Electronic supplementary material The online version of this article (doi:10.1186/s13046-016-0424-x) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Cinzia Pisani
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161, Rome, Italy.
| | - Annalisa Onori
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161, Rome, Italy
| | - Francesca Gabanella
- CNR -Institute of Cell Biology and Neurobiology, Rome, Italy.,IRCCS Fondazione Santa Lucia, Rome, Italy
| | - Francesca Delle Monache
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161, Rome, Italy
| | - Antonella Borreca
- CNR -Institute of Cell Biology and Neurobiology, Rome, Italy.,IRCCS Fondazione Santa Lucia, Rome, Italy
| | - Martine Ammassari-Teule
- CNR -Institute of Cell Biology and Neurobiology, Rome, Italy.,IRCCS Fondazione Santa Lucia, Rome, Italy
| | - Maurizio Fanciulli
- Department of Research, Advanced Diagnostic, and Technological Innovation, SAFU Laboratory, Regina Elena Cancer Institute, Rome, Italy
| | - Maria Grazia Di Certo
- CNR -Institute of Cell Biology and Neurobiology, Rome, Italy.,IRCCS Fondazione Santa Lucia, Rome, Italy
| | - Claudio Passananti
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161, Rome, Italy
| | - Nicoletta Corbi
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161, Rome, Italy.
| |
Collapse
|