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Elliff J, Biswas A, Roshan P, Kuppa S, Patterson A, Mattice J, Chinnaraj M, Burd R, Walker SE, Pozzi N, Antony E, Bothner B, Origanti S. Dynamic states of eIF6 and SDS variants modulate interactions with uL14 of the 60S ribosomal subunit. Nucleic Acids Res 2023; 51:1803-1822. [PMID: 36651285 PMCID: PMC9976893 DOI: 10.1093/nar/gkac1266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/20/2022] [Accepted: 12/22/2022] [Indexed: 01/19/2023] Open
Abstract
Assembly of ribosomal subunits into active ribosomal complexes is integral to protein synthesis. Release of eIF6 from the 60S ribosomal subunit primes 60S to associate with the 40S subunit and engage in translation. The dynamics of eIF6 interaction with the uL14 (RPL23) interface of 60S and its perturbation by somatic mutations acquired in Shwachman-Diamond Syndrome (SDS) is yet to be clearly understood. Here, by using a modified strategy to obtain high yields of recombinant human eIF6 we have uncovered the critical interface entailing eight key residues in the C-tail of uL14 that is essential for physical interactions between 60S and eIF6. Disruption of the complementary binding interface by conformational changes in eIF6 disease variants provide a mechanism for weakened interactions of variants with the 60S. Hydrogen-deuterium exchange mass spectrometry (HDX-MS) analyses uncovered dynamic configurational rearrangements in eIF6 induced by binding to uL14 and exposed an allosteric interface regulated by the C-tail of eIF6. Disrupting key residues in the eIF6-60S binding interface markedly limits proliferation of cancer cells, which highlights the significance of therapeutically targeting this interface. Establishing these key interfaces thus provide a therapeutic framework for targeting eIF6 in cancers and SDS.
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Affiliation(s)
- Jonah Elliff
- Department of Biological Sciences, Marquette University, Milwaukee, WI 53233, USA
- Department of Immunology, The University of Iowa, Iowa City, IA 52242, USA
| | - Aparna Biswas
- Department of Biology, Saint Louis University, St. Louis, MO 63103, USA
| | - Poonam Roshan
- Department of Biology, Saint Louis University, St. Louis, MO 63103, USA
| | - Sahiti Kuppa
- Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, MO 63104, USA
| | - Angela Patterson
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA
| | - Jenna Mattice
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA
| | - Mathivanan Chinnaraj
- Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, MO 63104, USA
| | - Ryan Burd
- Department of Biological Sciences, Marquette University, Milwaukee, WI 53233, USA
| | - Sarah E Walker
- Department of Biological Sciences, State University of New York, Buffalo, NY 14260, USA
| | - Nicola Pozzi
- Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, MO 63104, USA
| | - Edwin Antony
- Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, MO 63104, USA
| | - Brian Bothner
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA
| | - Sofia Origanti
- Department of Biology, Saint Louis University, St. Louis, MO 63103, USA
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5
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Zhao Z, Chu W, Zheng Y, Wang C, Yang Y, Xu T, Yang X, Zhang W, Ding X, Li G, Zhang H, Zhou J, Ye J, Wu H, Song X, Wu Y. Cytoplasmic eIF6 promotes OSCC malignant behavior through AKT pathway. Cell Commun Signal 2021; 19:121. [PMID: 34922580 PMCID: PMC8684100 DOI: 10.1186/s12964-021-00800-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 10/30/2021] [Indexed: 01/06/2023] Open
Abstract
Background Eukaryotic translation initiation factor 6 (eIF6), also known as integrin β4 binding protein, is involved in ribosome formation and mRNA translation, acting as an anti-association factor. It is also essential for the growth and reproduction of cells, including tumor cells. Yet, its role in oral squamous cell carcinoma (OSCC) remains unclear. Methods The expression characteristics of eIF6 in 233 samples were comprehensively analyzed by immunohistochemical staining (IHC). Effects of eIF6 over-expression and knockdown on cell proliferation, migration and invasion were determined by CCK-8, wound healing and Transwell assays. Western blot, immunofluorescence (IF) and co-immunoprecipitation (co-IP) were performed for mechanical verification. Results We found that cytoplasmic eIF6 was abnormally highly expressed in OSCC tissues, and its expression was associated with tumor size and the clinical grade. Amplification of eIF6 promoted the growth, migration and invasion capabilities of OSCC cell lines in vitro and tumor growth in vivo. Through Western blot analysis, we further discovered that eIF6 significantly promotes epithelial-mesenchymal transformation (EMT) in OSCC cells, while depletion of eIF6 can reverse this process. Mechanistically, eIF6 promoted tumor progression by activating the AKT signaling pathway. By performing co-immunoprecipitation, we discovered a direct interaction between endogenous eIF6 and AKT protein in the cytoplasm. Conclusion These results demonstrated that eIF6 could be a new therapeutic target in OSCC, thus providing a new basis for the prognosis of OSCC patients in the future. Video abstract
Supplementary Information The online version contains supplementary material available at 10.1186/s12964-021-00800-4.
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Affiliation(s)
- Zechen Zhao
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Weiming Chu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Stomatology, Clinical Medical College, Yangzhou University, Yangzhou, Jiangsu, People's Republic of China
| | - Yang Zheng
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral Maxillofacial and Head and Neck Oncology, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Disease, National Center of Stomatology, Shanghai, 200011, China
| | - Chao Wang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Yuemei Yang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Teng Xu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Xueming Yang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Stomatology, The Affiliated People's Hospital of Jiangsu University, Zhenjiang, Jiangsu, People's Republic of China
| | - Wei Zhang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Xu Ding
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Gang Li
- Department of Stomatology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, People's Republic of China
| | - Hongchuang Zhang
- Department of Stomatology, Xuzhou No.1 Peoples Hospital, Xuzhou, Jiangsu, People's Republic of China
| | - Junbo Zhou
- Department of Stomatology, Nanjing Integrated Traditional Chinese and Western Medicine Hospital, Nanjing, Jiangsu, People's Republic of China
| | - Jinhai Ye
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Heming Wu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Xiaomeng Song
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China
| | - Yunong Wu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, No.1, Shanghai Road, Gulou District, Nanjing, Jiangsu, 210029, People's Republic of China. .,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China. .,Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.
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