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Sagae T, Yokogawa M, Sawazaki R, Ishii Y, Hosoda N, Hoshino SI, Imai S, Shimada I, Osawa M. Paip2A inhibits translation by competitively binding to the RNA recognition motifs of PABPC1 and promoting its dissociation from the poly(A) tail. J Biol Chem 2022; 298:101844. [PMID: 35307347 PMCID: PMC9019252 DOI: 10.1016/j.jbc.2022.101844] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 03/09/2022] [Accepted: 03/10/2022] [Indexed: 12/04/2022] Open
Abstract
Eukaryotic mRNAs possess a poly(A) tail at their 3′-end, to which poly(A)-binding protein C1 (PABPC1) binds and recruits other proteins that regulate translation. Enhanced poly(A)-dependent translation, which is also PABPC1 dependent, promotes cellular and viral proliferation. PABP-interacting protein 2A (Paip2A) effectively represses poly(A)-dependent translation by causing the dissociation of PABPC1 from the poly(A) tail; however, the underlying mechanism remains unknown. This study was conducted to investigate the functional mechanisms of Paip2A action by characterizing the PABPC1–poly(A) and PABPC1–Paip2A interactions. Isothermal titration calorimetry and NMR analyses indicated that both interactions predominantly occurred at the RNA recognition motif (RRM)2–RRM3 regions of PABPC1, which have comparable affinities for poly(A) and Paip2A (dissociation constant, Kd = 1 nM). However, the Kd values of isolated RRM2 were 200 and 4 μM in their interactions with poly(A) and Paip2A, respectively; Kd values of 5 and 1 μM were observed for the interactions of isolated RRM3 with poly(A) and Paip2A, respectively. NMR analyses also revealed that Paip2A can bind to the poly(A)-binding interfaces of the RRM2 and RRM3 regions of PABPC1. Based on these results, we propose the following functional mechanism for Paip2A: Paip2A initially binds to the RRM2 region of poly(A)-bound PABPC1, and RRM2-anchored Paip2A effectively displaces the RRM3 region from poly(A), resulting in dissociation of the whole PABPC1 molecule. Together, our findings provide insight into the translation repression effect of Paip2A and may aid in the development of novel anticancer and/or antiviral drugs.
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Affiliation(s)
- Takeru Sagae
- Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo, Japan
| | - Mariko Yokogawa
- Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo, Japan
| | - Ryoichi Sawazaki
- Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo, Japan
| | - Yuichiro Ishii
- Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo, Japan
| | - Nao Hosoda
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Mizuho-ku, Nagoya, Japan
| | - Shin-Ichi Hoshino
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Mizuho-ku, Nagoya, Japan
| | - Shunsuke Imai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan; Center for Biosystems Dynamics Research, RIKEN, Tsurumi-ku, Yokohama, Japan
| | - Ichio Shimada
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan; Center for Biosystems Dynamics Research, RIKEN, Tsurumi-ku, Yokohama, Japan
| | - Masanori Osawa
- Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo, Japan.
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Sawazaki R, Imai S, Yokogawa M, Hosoda N, Hoshino SI, Mio M, Mio K, Shimada I, Osawa M. Characterization of the multimeric structure of poly(A)-binding protein on a poly(A) tail. Sci Rep 2018; 8:1455. [PMID: 29362417 PMCID: PMC5780489 DOI: 10.1038/s41598-018-19659-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 01/05/2018] [Indexed: 11/24/2022] Open
Abstract
Eukaryotic mature mRNAs possess a poly adenylate tail (poly(A)), to which multiple molecules of poly(A)-binding protein C1 (PABPC1) bind. PABPC1 regulates translation and mRNA metabolism by binding to regulatory proteins. To understand functional mechanism of the regulatory proteins, it is necessary to reveal how multiple molecules of PABPC1 exist on poly(A). Here, we characterize the structure of the multiple molecules of PABPC1 on poly(A), by using transmission electron microscopy (TEM), chemical cross-linking, and NMR spectroscopy. The TEM images and chemical cross-linking results indicate that multiple PABPC1 molecules form a wormlike structure in the PABPC1-poly(A) complex, in which the PABPC1 molecules are linearly arrayed. NMR and cross-linking analyses indicate that PABPC1 forms a multimer by binding to the neighbouring PABPC1 molecules via interactions between the RNA recognition motif (RRM) 2 in one molecule and the middle portion of the linker region of another molecule. A PABPC1 mutant lacking the interaction site in the linker, which possesses an impaired ability to form the multimer, reduced the in vitro translation activity, suggesting the importance of PABPC1 multimer formation in the translation process. We therefore propose a model of the PABPC1 multimer that provides clues to comprehensively understand the regulation mechanism of mRNA translation.
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Affiliation(s)
- Ryoichi Sawazaki
- Graduate School of Pharmaceutical Sciences, Keio University, Shibakoen, Minato-ku, Tokyo, 105-8512, Japan
| | - Shunsuke Imai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Mariko Yokogawa
- Graduate School of Pharmaceutical Sciences, Keio University, Shibakoen, Minato-ku, Tokyo, 105-8512, Japan
| | - Nao Hosoda
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Mizuho-ku, Nagoya, 467-8603, Japan
| | - Shin-Ichi Hoshino
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Mizuho-ku, Nagoya, 467-8603, Japan
| | - Muneyo Mio
- Molecular Profiling Research Center for Drug Discovery and OPERANDO Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, Koto-ku, Tokyo, 135-0064, Japan
| | - Kazuhiro Mio
- Molecular Profiling Research Center for Drug Discovery and OPERANDO Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, Koto-ku, Tokyo, 135-0064, Japan
| | - Ichio Shimada
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masanori Osawa
- Graduate School of Pharmaceutical Sciences, Keio University, Shibakoen, Minato-ku, Tokyo, 105-8512, Japan. .,Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
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Ishihara T, Hayashi E, Yamamoto S, Kobayashi C, Tamura Y, Sawazaki R, Tamura F, Tahara K, Kasahara T, Ishihara T, Takenaga M, Fukuda K, Mizushima T. Encapsulation of beraprost sodium in nanoparticles: Analysis of sustained release properties, targeting abilities and pharmacological activities in animal models of pulmonary arterial hypertension. J Control Release 2015; 197:97-104. [DOI: 10.1016/j.jconrel.2014.10.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 09/30/2014] [Accepted: 10/27/2014] [Indexed: 11/29/2022]
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Sawazaki R, Ishihara T, Usui S, Hayashi E, Tahara K, Hoshino T, Higuchi A, Nakamura S, Tsubota K, Mizushima T. Diclofenac Protects Cultured Human Corneal Epithelial Cells Against Hyperosmolarity and Ameliorates Corneal Surface Damage in a Rat Model of Dry Eye. ACTA ACUST UNITED AC 2014; 55:2547-56. [DOI: 10.1167/iovs.13-13850] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Ryoichi Sawazaki
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - Tomoaki Ishihara
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - Shinya Usui
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - Erika Hayashi
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - Kayoko Tahara
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - Tatsuya Hoshino
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - Akihiro Higuchi
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
| | - Shigeru Nakamura
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
| | - Kazuo Tsubota
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
| | - Tohru Mizushima
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
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