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Keppeke GD, Chang CC, Peng M, Chen LY, Lin WC, Pai LM, Andrade LEC, Sung LY, Liu JL. IMP/GTP balance modulates cytoophidium assembly and IMPDH activity. Cell Div 2018; 13:5. [PMID: 29946345 PMCID: PMC6004095 DOI: 10.1186/s13008-018-0038-0] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 06/06/2018] [Indexed: 02/07/2023] Open
Abstract
Background Inosine monophosphate dehydrogenase (IMPDH), the rate-limiting enzyme in de novo GTP biosynthesis, plays an important role in cell metabolism and proliferation. It has been demonstrated that IMPDH can aggregate into a macrostructure, termed the cytoophidium, in mammalian cells under a variety of conditions. However, the regulation and function of the cytoophidium are still elusive. Results In this study, we report that spontaneous filamentation of IMPDH is correlated with rapid cell proliferation. Intracellular IMP accumulation promoted cytoophidium assembly, whereas elevated GTP level triggered disassociation of aggregates. By using IMPDH2 CBS domain mutant cell models, which are unable to form the cytoophidium, we have determined that the cytoophidium is of the utmost importance for maintaining the GTP pool and normal cell proliferation in the condition that higher IMPDH activity is required. Conclusions Together, our results suggest a novel mechanism whereby cytoophidium assembly upregulates IMPDH activity and mediates guanine nucleotide homeostasis. Electronic supplementary material The online version of this article (10.1186/s13008-018-0038-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Gerson Dierley Keppeke
- 1Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3PT UK
| | - Chia Chun Chang
- 1Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3PT UK.,2Institute of Biotechnology, National Taiwan University, Taipei, 106 Taiwan, ROC
| | - Min Peng
- 2Institute of Biotechnology, National Taiwan University, Taipei, 106 Taiwan, ROC
| | - Li-Yu Chen
- 1Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3PT UK
| | - Wei-Cheng Lin
- 3Molecular Medicine Research Center, College of Medicine, Chang Gung University, Tao-Yuan, 333 Taiwan, ROC
| | - Li-Mei Pai
- 3Molecular Medicine Research Center, College of Medicine, Chang Gung University, Tao-Yuan, 333 Taiwan, ROC.,4Graduate Institute of Biomedical Science, College of Medicine, Chang Gung University, Tao-Yuan, 333 Taiwan, ROC.,5Department of Biochemistry, College of Medicine, Chang Gung University, Tao-Yuan, 333 Taiwan, ROC
| | - Luis Eduardo Coelho Andrade
- 6Rheumatology Division, Escola Paulista de Medicina, Universidade Federal de Sao Paulo, Sao Paulo, SP 04023-062 Brazil
| | - Li-Ying Sung
- 2Institute of Biotechnology, National Taiwan University, Taipei, 106 Taiwan, ROC.,7Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 115 Taiwan, ROC
| | - Ji-Long Liu
- 1Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3PT UK.,8School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210 China
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