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Francis JW, Hausmann S, Ikram S, Yin K, Mealey-Farr R, Flores NM, Trinh AT, Chasan T, Thompson J, Mazur PK, Gozani O. FAM86A methylation of eEF2 links mRNA translation elongation to tumorigenesis. Mol Cell 2024; 84:1753-1763.e7. [PMID: 38508183 PMCID: PMC11069438 DOI: 10.1016/j.molcel.2024.02.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 01/16/2024] [Accepted: 02/29/2024] [Indexed: 03/22/2024]
Abstract
eEF2 post-translational modifications (PTMs) can profoundly affect mRNA translation dynamics. However, the physiologic function of eEF2K525 trimethylation (eEF2K525me3), a PTM catalyzed by the enzyme FAM86A, is unknown. Here, we find that FAM86A methylation of eEF2 regulates nascent elongation to promote protein synthesis and lung adenocarcinoma (LUAD) pathogenesis. The principal physiologic substrate of FAM86A is eEF2, with K525me3 modeled to facilitate productive eEF2-ribosome engagement during translocation. FAM86A depletion in LUAD cells causes 80S monosome accumulation and mRNA translation inhibition. FAM86A is overexpressed in LUAD and eEF2K525me3 levels increase through advancing LUAD disease stages. FAM86A knockdown attenuates LUAD cell proliferation and suppression of the FAM86A-eEF2K525me3 axis inhibits cancer cell and patient-derived LUAD xenograft growth in vivo. Finally, FAM86A ablation strongly attenuates tumor growth and extends survival in KRASG12C-driven LUAD mouse models. Thus, our work uncovers an eEF2 methylation-mediated mRNA translation elongation regulatory node and nominates FAM86A as an etiologic agent in LUAD.
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Affiliation(s)
| | - Simone Hausmann
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Sabeen Ikram
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Kunlun Yin
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | | | - Natasha Mahealani Flores
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Annie Truc Trinh
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Tourkian Chasan
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Julia Thompson
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Pawel Karol Mazur
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
| | - Or Gozani
- Department of Biology, Stanford University, Stanford, CA 94305, USA.
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Mealey-Farr R, Jeong J, Park J, Liu S, Hausmann S, Francis JW, Angulo Ibanez M, Cho J, Chua K, Mazur PK, Gozani O. Antibody toolkit to investigate eEF1A methylation dynamics in mRNA translation elongation. J Biol Chem 2023; 299:104747. [PMID: 37094697 PMCID: PMC10220242 DOI: 10.1016/j.jbc.2023.104747] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 04/12/2023] [Accepted: 04/17/2023] [Indexed: 04/26/2023] Open
Abstract
Protein synthesis is a fundamental step in gene expression, with modulation of mRNA translation at the elongation step emerging as an important regulatory node in shaping cellular proteomes. In this context, five distinct lysine methylation events on eukaryotic elongation factor 1A (eEF1A), a fundamental nonribosomal elongation factor, are proposed to influence mRNA translation elongation dynamics. However, a lack of affinity tools has hindered progress in fully understanding how eEF1A lysine methylation impacts protein synthesis. Here we develop and characterize a suite of selective antibodies to investigate eEF1A methylation and provide evidence that methylation levels decline in aged tissue. Determination of the methyl state and stoichiometry on eEF1A in various cell lines by mass spectrometry shows modest cell-to-cell variability. We also find by Western blot analysis that knockdown of individual eEF1A-specific lysine methyltransferases leads to depletion of the cognate lysine methylation event and indicates active crosstalk between different sites. Further, we find that the antibodies are specific in immunohistochemistry applications. Finally, application of the antibody toolkit suggests that several eEF1A methylation events decrease in aged muscle tissue. Together, our study provides a roadmap for leveraging methyl state and sequence-selective antibody reagents to accelerate discovery of eEF1A methylation-related functions and suggests a role for eEF1A methylation, via protein synthesis regulation, in aging biology.
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Affiliation(s)
| | - Jinho Jeong
- Department of Biology, Stanford University, Stanford, California, USA
| | - Juhyung Park
- Department of Biology, Stanford University, Stanford, California, USA
| | - Shuo Liu
- Department of Biology, Stanford University, Stanford, California, USA
| | - Simone Hausmann
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Joel W Francis
- Department of Biology, Stanford University, Stanford, California, USA
| | - Maria Angulo Ibanez
- Department of Medicine, Stanford University School of Medicine, Stanford, California, USA; Geriatric Research, Education, and Clinical Center, Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA
| | - Joonseok Cho
- Department of Medicine, Stanford University School of Medicine, Stanford, California, USA; Geriatric Research, Education, and Clinical Center, Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA
| | - Katrin Chua
- Department of Medicine, Stanford University School of Medicine, Stanford, California, USA; Geriatric Research, Education, and Clinical Center, Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA
| | - Pawel K Mazur
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Or Gozani
- Department of Biology, Stanford University, Stanford, California, USA.
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