Abstract
The mammalian target of rapamycin complex 1 (mTORC1) is a critical regulator of protein synthesis. The best studied targets of mTORC1 in translation are the eukaryotic initiation factorbinding protein 1 (4E-BP1) and ribosomal protein S6 kinase 1 (S6K1). In this study, we identify the La-related protein 1 (LARP1) as a key novel target of mTORC1 with a fundamental role in terminal oligopyrimidine (TOP) mRNA translation. Recent genome-wide studies indicate that TOP and TOP-like mRNAs compose a large portion of the mTORC1 translatome, but the mechanism by which mTORC1 controls TOP mRNA translation is incompletely understood. Here, we report that LARP1 functions as a key repressor of TOP mRNA translation downstream of mTORC1. Our data show the following: (i) LARP1associates with mTORC1 via RAPTOR;(ii)LARP1 interacts with TOP mRNAs in an mTORC1-dependent manner; (iii) LARP1 binds the 5'TOP motif to repress TOP mRNA translation; and (iv) LARP1 competes with the eukaryotic initiation factor (eIF) 4G for TOP mRNA binding. Importantly, from a drug resistance standpoint, our data also show that reducing LARP1 protein levels by RNA interference attenuates the inhibitory effect of rapamycin, Torin1, and amino acid deprivation on TOP mRNA translation. Collectively, our findings demonstrate that LARP1 functions as an important repressor of TOP mRNA translation downstream of mTORC1.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 15996-16020 |
| Number of pages | 25 |
| Journal | Journal of Biological Chemistry |
| Volume | 290 |
| Issue number | 26 |
| DOIs | |
| State | Published - Jun 26 2015 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Biochemistry
- Molecular Biology
- Cell Biology
Cite this
La-related protein 1 (LARP1) represses terminal oligopyrimidine (TOP) mRNA translation downstream of mTOR complex 1 (mTORC1). / Fonseca, Bruno D.; Zakaria, Chadi; Jia, Jian Jun; Graber, Tyson E.; Svitkin, Yuri; Tahmasebi, Soroush; Healy, Danielle; Hoang, Huy Dung; Jensen, Jacob M.; Diao, Ilo T.; Lussier, Alexandre; Dajadian, Christopher; Padmanabhan, Niranjan; Wang, Walter; Matta-Camacho, Edna; Hearnden, Jaclyn; Smith, Ewan M.; Tsukumo, Yoshinori; Yanagiya, Akiko; Morita, Masahiro; Petroulakis, Emmanuel; González, Jose L.; Hernández, Greco; Alain, Tommy; Damgaard, Christian K.
In: Journal of Biological Chemistry, Vol. 290, No. 26, 26.06.2015, p. 15996-16020.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - La-related protein 1 (LARP1) represses terminal oligopyrimidine (TOP) mRNA translation downstream of mTOR complex 1 (mTORC1)
AU - Fonseca, Bruno D.
AU - Zakaria, Chadi
AU - Jia, Jian Jun
AU - Graber, Tyson E.
AU - Svitkin, Yuri
AU - Tahmasebi, Soroush
AU - Healy, Danielle
AU - Hoang, Huy Dung
AU - Jensen, Jacob M.
AU - Diao, Ilo T.
AU - Lussier, Alexandre
AU - Dajadian, Christopher
AU - Padmanabhan, Niranjan
AU - Wang, Walter
AU - Matta-Camacho, Edna
AU - Hearnden, Jaclyn
AU - Smith, Ewan M.
AU - Tsukumo, Yoshinori
AU - Yanagiya, Akiko
AU - Morita, Masahiro
AU - Petroulakis, Emmanuel
AU - González, Jose L.
AU - Hernández, Greco
AU - Alain, Tommy
AU - Damgaard, Christian K.
PY - 2015/6/26
Y1 - 2015/6/26
N2 - The mammalian target of rapamycin complex 1 (mTORC1) is a critical regulator of protein synthesis. The best studied targets of mTORC1 in translation are the eukaryotic initiation factorbinding protein 1 (4E-BP1) and ribosomal protein S6 kinase 1 (S6K1). In this study, we identify the La-related protein 1 (LARP1) as a key novel target of mTORC1 with a fundamental role in terminal oligopyrimidine (TOP) mRNA translation. Recent genome-wide studies indicate that TOP and TOP-like mRNAs compose a large portion of the mTORC1 translatome, but the mechanism by which mTORC1 controls TOP mRNA translation is incompletely understood. Here, we report that LARP1 functions as a key repressor of TOP mRNA translation downstream of mTORC1. Our data show the following: (i) LARP1associates with mTORC1 via RAPTOR;(ii)LARP1 interacts with TOP mRNAs in an mTORC1-dependent manner; (iii) LARP1 binds the 5'TOP motif to repress TOP mRNA translation; and (iv) LARP1 competes with the eukaryotic initiation factor (eIF) 4G for TOP mRNA binding. Importantly, from a drug resistance standpoint, our data also show that reducing LARP1 protein levels by RNA interference attenuates the inhibitory effect of rapamycin, Torin1, and amino acid deprivation on TOP mRNA translation. Collectively, our findings demonstrate that LARP1 functions as an important repressor of TOP mRNA translation downstream of mTORC1.
AB - The mammalian target of rapamycin complex 1 (mTORC1) is a critical regulator of protein synthesis. The best studied targets of mTORC1 in translation are the eukaryotic initiation factorbinding protein 1 (4E-BP1) and ribosomal protein S6 kinase 1 (S6K1). In this study, we identify the La-related protein 1 (LARP1) as a key novel target of mTORC1 with a fundamental role in terminal oligopyrimidine (TOP) mRNA translation. Recent genome-wide studies indicate that TOP and TOP-like mRNAs compose a large portion of the mTORC1 translatome, but the mechanism by which mTORC1 controls TOP mRNA translation is incompletely understood. Here, we report that LARP1 functions as a key repressor of TOP mRNA translation downstream of mTORC1. Our data show the following: (i) LARP1associates with mTORC1 via RAPTOR;(ii)LARP1 interacts with TOP mRNAs in an mTORC1-dependent manner; (iii) LARP1 binds the 5'TOP motif to repress TOP mRNA translation; and (iv) LARP1 competes with the eukaryotic initiation factor (eIF) 4G for TOP mRNA binding. Importantly, from a drug resistance standpoint, our data also show that reducing LARP1 protein levels by RNA interference attenuates the inhibitory effect of rapamycin, Torin1, and amino acid deprivation on TOP mRNA translation. Collectively, our findings demonstrate that LARP1 functions as an important repressor of TOP mRNA translation downstream of mTORC1.
UR - http://www.scopus.com/inward/record.url?scp=84941313390&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84941313390&partnerID=8YFLogxK
U2 - 10.1074/jbc.M114.621730
DO - 10.1074/jbc.M114.621730
M3 - Article
VL - 290
SP - 15996
EP - 16020
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 26
ER -