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Karpov DS, Spasskaya DS, Tutyaeva VV, Karpov VL. Rpn4p without the DNA-Binding Domain Provides Saccharomyces cerevisiae Resistance to Oxidative Stress and Cycloheximide. Mol Biol 2022. [DOI: 10.1134/s0026893322040057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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2
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Gou D, Zhou J, Song Q, Wang Z, Bai X, Zhang Y, Zuo M, Wang F, Chen A, Yousaf M, Yang Z, Peng H, Li K, Xie W, Tang J, Yao Y, Han M, Ke T, Chen Q, Xu C, Wang Q. Mog1 knockout causes cardiac hypertrophy and heart failure by downregulating tbx5-cryab-hspb2 signalling in zebrafish. Acta Physiol (Oxf) 2021; 231:e13567. [PMID: 33032360 DOI: 10.1111/apha.13567] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 09/09/2020] [Accepted: 09/29/2020] [Indexed: 12/19/2022]
Abstract
AIMS MOG1 is a small protein that can bind to small GTPase RAN and regulate transport of RNA and proteins between the cytoplasm and nucleus. However, the in vivo physiological role of mog1 in the heart needs to be fully defined. METHODS Mog1 knockout zebrafish was generated by TALEN. Echocardiography, histological analysis, and electrocardiograms were used to examine cardiac structure and function. RNA sequencing and real-time RT-PCR were used to elucidate the molecular mechanism and to analyse the gene expression. Isoproterenol was used to induce cardiac hypertrophy. Whole-mount in situ hybridization was used to observe cardiac morphogenesis. RESULTS Mog1 knockout zebrafish developed cardiac hypertrophy and heart failure (enlarged pericardium, increased nppa and nppb expression and ventricular wall thickness, and reduced ejection fraction), which was aggravated by isoproterenol. RNAseq and KEGG pathway analyses revealed the effect of mog1 knockout on the pathways of cardiac hypertrophy, dilatation and contraction. Mechanistic studies revealed that mog1 knockout decreased expression of tbx5, which reduced expression of cryab and hspb2, resulting in cardiac hypertrophy and heart failure. Overexpression of cryab, hspb2 and tbx5 rescued the cardiac oedema phenotype of mog1 KO zebrafish. Telemetry electrocardiogram monitoring showed QRS and QTc prolongation and a reduced heart rate in mog1 knockout zebrafish, which was associated with reduced scn1b expression. Moreover, mog1 knockout resulted in abnormal cardiac looping during embryogenesis because of the reduced expression of nkx2.5, gata4 and hand2. CONCLUSION Our data identified an important molecular determinant for cardiac hypertrophy and heart failure, and rhythm maintenance of the heart.
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Affiliation(s)
- Dongzhi Gou
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Juan Zhou
- School of Basic Medicine Gannan Medical University Ganzhou P. R. China
| | - Qixue Song
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Zhijie Wang
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Xuemei Bai
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Yidan Zhang
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Mengxia Zuo
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Fan Wang
- Department of Cardiovascular and Metabolic Sciences Lerner Research Institute Department of Cardiovascular Medicine Cleveland Clinic Cleveland OH USA
- Department of Molecular Medicine Cleveland Clinic Lerner College of Medicine of CaseWestern Reserve University Cleveland OH USA
| | - Ailan Chen
- Department of Cardiology Guangzhou Medical University Guangzhou P. R. China
| | - Muhammad Yousaf
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Zhongcheng Yang
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Huixing Peng
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Ke Li
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Wen Xie
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Jingluo Tang
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Yufeng Yao
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Meng Han
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Tie Ke
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Qiuyun Chen
- Department of Cardiovascular and Metabolic Sciences Lerner Research Institute Department of Cardiovascular Medicine Cleveland Clinic Cleveland OH USA
- Department of Molecular Medicine Cleveland Clinic Lerner College of Medicine of CaseWestern Reserve University Cleveland OH USA
| | - Chengqi Xu
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
| | - Qing Wang
- Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome Research Huazhong University of Science and Technology Wuhan P. R. China
- Department of Cardiovascular and Metabolic Sciences Lerner Research Institute Department of Cardiovascular Medicine Cleveland Clinic Cleveland OH USA
- Department of Molecular Medicine Cleveland Clinic Lerner College of Medicine of CaseWestern Reserve University Cleveland OH USA
- Department of Genetics and Genome Science Case Western Reserve University School of Medicine Cleveland OH USA
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3
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Bao X, Liu H, Liu X, Ruan K, Zhang Y, Zhang Z, Hu Q, Liu Y, Akram S, Zhang J, Gong Q, Wang W, Yuan X, Li J, Zhao L, Dou Z, Tian R, Yao X, Wu J, Shi Y. Mitosis-specific acetylation tunes Ran effector binding for chromosome segregation. J Mol Cell Biol 2019; 10:18-32. [PMID: 29040603 PMCID: PMC6041754 DOI: 10.1093/jmcb/mjx045] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 10/03/2017] [Indexed: 11/12/2022] Open
Abstract
Stable transmission of genetic information during cell division requires faithful mitotic spindle assembly and chromosome segregation. The Ran GTPase plays a key role in mitotic spindle assembly. However, how the generation of a chemical gradient of Ran-GTP at the spindle is coupled to mitotic post-translational modifications has never been characterized. Here, we solved the complex structure of Ran with the nucleotide release factor Mog1 and delineated a novel mitosis-specific acetylation-regulated Ran-Mog1 interaction during chromosome segregation. Our structure-guided functional analyses revealed that Mog1 competes with RCC1 for Ran binding in a GTP/GDP-dependent manner. Biochemical characterization demonstrated that Mog1-bound Ran prevents RCC1 binding and subsequent GTP loading. Surprisingly, Ran is a bona fide substrate of TIP60, and the acetylation of Lys134 by TIP60 liberates Mog1 from Ran binding during mitosis. Importantly, this acetylation-elicited switch of Ran binding to RCC1 promotes high level of Ran-GTP, which is essential for chromosome alignment. These results establish a previously uncharacterized regulatory mechanism in which TIP60 provides a homeostatic control of Ran-GTP level by tuning Ran effector binding for chromosome segregation in mitosis.
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Affiliation(s)
- Xiaoling Bao
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Heng Liu
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Xing Liu
- Center of Excellence in Molecular Cell Sciences, Chinese Academy of Sciences & Anhui Key Laboratory for Cellular Dynamics and Chemical Biology, Hefei 230027, China
| | - Ke Ruan
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Yonghui Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Zhiyong Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Qi Hu
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Ying Liu
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Saima Akram
- Center of Excellence in Molecular Cell Sciences, Chinese Academy of Sciences & Anhui Key Laboratory for Cellular Dynamics and Chemical Biology, Hefei 230027, China
| | - Jiahai Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Qingguo Gong
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Wenwen Wang
- Center of Excellence in Molecular Cell Sciences, Chinese Academy of Sciences & Anhui Key Laboratory for Cellular Dynamics and Chemical Biology, Hefei 230027, China
| | - Xiao Yuan
- Southern University of Science & Technology, Shenzhen 518055, China
| | - Jian Li
- Keck Center for Molecular Imaging, Morehouse School of Medicine, Atlanta, GA 30310, USA
| | - Lingli Zhao
- Keck Center for Molecular Imaging, Morehouse School of Medicine, Atlanta, GA 30310, USA
| | - Zhen Dou
- Center of Excellence in Molecular Cell Sciences, Chinese Academy of Sciences & Anhui Key Laboratory for Cellular Dynamics and Chemical Biology, Hefei 230027, China
| | - Ruijun Tian
- Southern University of Science & Technology, Shenzhen 518055, China
| | - Xuebiao Yao
- Center of Excellence in Molecular Cell Sciences, Chinese Academy of Sciences & Anhui Key Laboratory for Cellular Dynamics and Chemical Biology, Hefei 230027, China
| | - Jihui Wu
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Yunyu Shi
- Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
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4
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Yang Y, Yu H. Partner switching for Ran during the mitosis dance. J Mol Cell Biol 2019; 10:89-90. [PMID: 29136174 DOI: 10.1093/jmcb/mjx048] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 11/06/2017] [Indexed: 11/13/2022] Open
Affiliation(s)
- Yang Yang
- Howard Hughes Medical Institute, Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Hongtao Yu
- Howard Hughes Medical Institute, Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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5
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Kuo CJ, Gao J, Huang JW, Ko TP, Zhai C, Ma L, Liu W, Dai L, Chang YF, Chen TH, Hu Y, Yu X, Guo RT, Chen CC. Functional and structural investigations of fibronectin-binding protein Apa from Mycobacterium tuberculosis. Biochim Biophys Acta Gen Subj 2019; 1863:1351-1359. [PMID: 31175911 DOI: 10.1016/j.bbagen.2019.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/26/2019] [Accepted: 06/03/2019] [Indexed: 10/26/2022]
Abstract
BACKGROUND Alanine and proline-rich protein (Apa) is a secreted antigen of Mycobacterium spp. which involves in stimulating immune responses and adhering to host cells by binding to fibronectin (Fn). Here, we report the crystal structure of Apa from Mycobacterium tuberculosis (Mtb) and its Fn-binding characteristics. METHODS The crystal structure of Mtb Apa was determined at resolutions of 1.54 Å. The dissociation constants (KD) of Apa and individual modules of Fn were determined by surface plasmon resonance and enzyme-linked immunosorbent assay. Site-directed mutagenesis was performed to investigate the putative Fn-binding motif of Apa. RESULTS Mtb Apa folds into a large seven-stranded anti-parallel β-sheet which is flanked by three α-helices. The binding affinity of Mtb Apa to individual Fn modules was assessed and the results indicated that the Mtb Apa binds to FnIII-4 and FnIII-5 of Fn CBD segment. Notably, structure analysis suggested that the previously proposed Fn-binding motif 258RWFV261 is buried within the protein and may not be accessible to the binding counterpart. CONCLUSIONS The structural and Fn-binding characteristics we reported here provide molecular insights into the multifunctional protein Mtb Apa. FnIII-4 and FnIII-5 of CBD are the only two modules contributing to Apa-Fn interaction. GENERAL SIGNIFICANCE This is the first study to report the structure and Fn-binding characteristics of mycobacterial Apa. Since Apa plays a central role in stimulating immune responses and host cells adhesion, these results are of great importance in understanding the pathogenesis of mycobacterium. This information shall provide a guidance for the development of anti-mycobacteria regimen.
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Affiliation(s)
- Chih-Jung Kuo
- Department of Veterinary Medicine, National Chung Hsing University, Taichung 402, Taiwan
| | - Jian Gao
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China; Tianjin Institute of Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Jian-Wen Huang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Tzu-Ping Ko
- Institute of Biological Chemistry, Academia Sinica, Taiwan
| | - Chao Zhai
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Lixin Ma
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Weidong Liu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China; Tianjin Institute of Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Longhai Dai
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Yung-Fu Chang
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, United States of America
| | - Ter-Hsin Chen
- Graduate Institute of Veterinary Pathobiology, National Chung Hsing University, Taichung 402, Taiwan
| | - Yumei Hu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Xuejing Yu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China.
| | - Rey-Ting Guo
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China; Tianjin Institute of Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
| | - Chun-Chi Chen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China.
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6
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Wang Z, Yu G, Liu Y, Liu S, Aridor M, Huang Y, Hu Y, Wang L, Li S, Xiong H, Tang B, Li X, Cheng C, Chakrabarti S, Wang F, Wu Q, Karnik SS, Xu C, Chen Q, Wang QK. Small GTPases SAR1A and SAR1B regulate the trafficking of the cardiac sodium channel Na v1.5. Biochim Biophys Acta Mol Basis Dis 2018; 1864:3672-3684. [PMID: 30251687 PMCID: PMC6168416 DOI: 10.1016/j.bbadis.2018.09.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 08/27/2018] [Accepted: 09/05/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND The cardiac sodium channel Nav1.5 is essential for the physiological function of the heart and causes cardiac arrhythmias and sudden death when mutated. Many disease-causing mutations in Nav1.5 cause defects in protein trafficking, a cellular process critical to the targeting of Nav1.5 to cell surface. However, the molecular mechanisms underlying the trafficking of Nav1.5, in particular, the exit from the endoplasmic reticulum (ER) for cell surface trafficking, remain poorly understood. METHODS AND RESULTS Here we investigated the role of the SAR1 GTPases in trafficking of Nav1.5. Overexpression of dominant-negative mutant SAR1A (T39N or H79G) or SAR1B (T39N or H79G) significantly reduces the expression level of Nav1.5 on cell surface, and decreases the peak sodium current density (INa) in HEK/Nav1.5 cells and neonatal rat cardiomyocytes. Simultaneous knockdown of SAR1A and SAR1B expression by siRNAs significantly reduces the INa density, whereas single knockdown of either SAR1A or SAR1B has minimal effect. Computer modeling showed that the three-dimensional structure of SAR1 is similar to RAN. RAN was reported to interact with MOG1, a small protein involved in regulation of the ER exit of Nav1.5. Co-immunoprecipitation showed that SAR1A or SAR1B interacted with MOG1. Interestingly, knockdown of SAR1A and SAR1B expression abolished the MOG1-mediated increases in both cell surface trafficking of Nav1.5 and the density of INa. CONCLUSIONS These data suggest that SAR1A and SAR1B are the critical regulators of trafficking of Nav1.5. Moreover, SAR1A and SAR1B interact with MOG1, and are required for MOG1-mediated cell surface expression and function of Nav1.5.
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Affiliation(s)
- Zhijie Wang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China; Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA
| | - Gang Yu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China; Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA
| | - Yinan Liu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Shiyong Liu
- College of Physics, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Meir Aridor
- Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Yuan Huang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China; National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan, China
| | - Yushuang Hu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Longfei Wang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Sisi Li
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Hongbo Xiong
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Bo Tang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Xia Li
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Chen Cheng
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Susmita Chakrabarti
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA
| | - Fan Wang
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA
| | - Qingyu Wu
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA
| | - Sadashiva S Karnik
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA
| | - Chengqi Xu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Qiuyun Chen
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA.
| | - Qing K Wang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, PR China; Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA.
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7
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Yu G, Liu Y, Qin J, Wang Z, Hu Y, Wang F, Li Y, Chakrabarti S, Chen Q, Wang QK. Mechanistic insights into the interaction of the MOG1 protein with the cardiac sodium channel Na v1.5 clarify the molecular basis of Brugada syndrome. J Biol Chem 2018; 293:18207-18217. [PMID: 30282806 DOI: 10.1074/jbc.ra118.003997] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 09/23/2018] [Indexed: 01/26/2023] Open
Abstract
Nav1.5 is the α-subunit of the cardiac sodium channel complex. Abnormal expression of Nav1.5 on the cell surface because of mutations that disrupt Nav1.5 trafficking causes Brugada syndrome (BrS), sick sinus syndrome (SSS), cardiac conduction disease, dilated cardiomyopathy, and sudden infant death syndrome. We and others previously reported that Ran-binding protein MOG1 (MOG1), a small protein that interacts with Nav1.5, promotes Nav1.5 intracellular trafficking to plasma membranes and that a substitution in MOG1, E83D, causes BrS. However, the molecular basis for the MOG1/Nav1.5 interaction and how the E83D substitution causes BrS remains unknown. Here, we assessed the effects of defined MOG1 deletions and alanine-scanning substitutions on MOG1's interaction with Nav1.5. Large deletion analysis mapped the MOG1 domain required for the interaction with Nav1.5 to the region spanning amino acids 146-174, and a refined deletion analysis further narrowed this domain to amino acids 146-155. Site-directed mutagenesis further revealed that Asp-148, Arg-150, and Ser-151 cluster in a peptide loop essential for binding to Nav1.5. GST pulldown and electrophysiological analyses disclosed that the substitutions E83D, D148Q, R150Q, and S151Q disrupt MOG1's interaction with Nav1.5 and significantly reduce its trafficking to the cell surface. Examination of MOG1's 3D structure revealed that Glu-83 and the loop containing Asp-148, Arg-150, and Ser-151 are spatially proximal, suggesting that these residues form a critical binding site for Nav1.5. In conclusion, our findings identify the structural elements in MOG1 that are crucial for its interaction with Nav1.5 and improve our understanding of how the E83D substitution causes BrS.
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Affiliation(s)
- Gang Yu
- From the Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, China,; Center for Cardiovascular Genetics, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio 44195
| | - Yinan Liu
- From the Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jun Qin
- Center for Cardiovascular Genetics, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio 44195
| | - Zhijie Wang
- From the Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, China,; Center for Cardiovascular Genetics, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio 44195
| | - Yushuang Hu
- From the Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Fan Wang
- Center for Cardiovascular Genetics, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio 44195
| | - Yabo Li
- Center for Cardiovascular Genetics, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio 44195,; College of Life Sciences, Lanzhou University, Lanzhou, Gansu, China, and
| | - Susmita Chakrabarti
- Center for Cardiovascular Genetics, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio 44195
| | - Qiuyun Chen
- Center for Cardiovascular Genetics, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio 44195,.
| | - Qing Kenneth Wang
- From the Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan 430074, China,; Center for Cardiovascular Genetics, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic; Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio 44195,; Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106.
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8
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Oliete-Calvo P, Serrano-Quílez J, Nuño-Cabanes C, Pérez-Martínez ME, Soares LM, Dichtl B, Buratowski S, Pérez-Ortín JE, Rodríguez-Navarro S. A role for Mog1 in H2Bub1 and H3K4me3 regulation affecting RNAPII transcription and mRNA export. EMBO Rep 2018; 19:embr.201845992. [PMID: 30249596 DOI: 10.15252/embr.201845992] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 08/28/2018] [Accepted: 08/31/2018] [Indexed: 12/11/2022] Open
Abstract
Monoubiquitination of histone H2B (to H2Bub1) is required for downstream events including histone H3 methylation, transcription, and mRNA export. The mechanisms and players regulating these events have not yet been completely delineated. Here, we show that the conserved Ran-binding protein Mog1 is required to sustain normal levels of H2Bub1 and H3K4me3 in Saccharomyces cerevisiae Mog1 is needed for gene body recruitment of Rad6, Bre1, and Rtf1 that are involved in H2B ubiquitination and genetically interacts with these factors. We provide evidence that the absence of MOG1 impacts on cellular processes such as transcription, DNA replication, and mRNA export, which are linked to H2Bub1. Importantly, the mRNA export defect in mog1Δ strains is exacerbated by the absence of factors that decrease H2Bub1 levels. Consistent with a role in sustaining H2Bub and H3K4me3 levels, Mog1 co-precipitates with components that participate in these modifications such as Bre1, Rtf1, and the COMPASS-associated factors Shg1 and Sdc1. These results reveal a novel role for Mog1 in H2B ubiquitination, transcription, and mRNA biogenesis.
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Affiliation(s)
- Paula Oliete-Calvo
- Gene expression and mRNA Metabolism Laboratory, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain
| | - Joan Serrano-Quílez
- Gene expression and mRNA Metabolism Laboratory, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain.,Gene expression and mRNA Metabolism Laboratory, Instituto de Biomedicina de Valencia, Consejo Superior de Investigaciones Científicas (CSIC), Valencia, Spain
| | - Carme Nuño-Cabanes
- Gene expression and mRNA Metabolism Laboratory, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain.,Gene expression and mRNA Metabolism Laboratory, Instituto de Biomedicina de Valencia, Consejo Superior de Investigaciones Científicas (CSIC), Valencia, Spain
| | - María E Pérez-Martínez
- Departamento de Bioquímica y Biología Molecular and E.R.I. Biotecmed, Facultad de Biología, Universitat de València, Burjassot, Spain
| | - Luis M Soares
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA
| | - Bernhard Dichtl
- School of Life and Environmental Sciences, Faculty of Science, Engineering and Built Environment, Centre for Cellular and Molecular Biology, Deakin University, Geelong, Vic., Australia
| | - Stephen Buratowski
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA
| | - José E Pérez-Ortín
- Departamento de Bioquímica y Biología Molecular and E.R.I. Biotecmed, Facultad de Biología, Universitat de València, Burjassot, Spain
| | - Susana Rodríguez-Navarro
- Gene expression and mRNA Metabolism Laboratory, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain .,Gene expression and mRNA Metabolism Laboratory, Instituto de Biomedicina de Valencia, Consejo Superior de Investigaciones Científicas (CSIC), Valencia, Spain
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9
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Cardiac sodium channel regulator MOG1 regulates cardiac morphogenesis and rhythm. Sci Rep 2016; 6:21538. [PMID: 26903377 PMCID: PMC4763225 DOI: 10.1038/srep21538] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 01/26/2016] [Indexed: 01/09/2023] Open
Abstract
MOG1 was initially identified as a protein that interacts with the small GTPase Ran involved in transport of macromolecules into and out of the nucleus. In addition, we have established that MOG1 interacts with the cardiac sodium channel Nav1.5 and regulates cell surface trafficking of Nav1.5. Here we used zebrafish as a model system to study the in vivo physiological role of MOG1. Knockdown of mog1 expression in zebrafish embryos significantly decreased the heart rate (HR). Consistently, the HR increases in embryos with over-expression of human MOG1. Compared with wild type MOG1 or control EGFP, mutant MOG1 with mutation E83D associated with Brugada syndrome significantly decreases the HR. Interestingly, knockdown of mog1 resulted in abnormal cardiac looping during embryogenesis. Mechanistically, knockdown of mog1 decreases expression of hcn4 involved in the regulation of the HR, and reduces expression of nkx2.5, gata4 and hand2 involved in cardiac morphogenesis. These data for the first time revealed a novel role that MOG1, a nucleocytoplasmic transport protein, plays in cardiac physiology and development.
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10
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Small GTP-binding protein Ran is regulated by posttranslational lysine acetylation. Proc Natl Acad Sci U S A 2015; 112:E3679-88. [PMID: 26124124 DOI: 10.1073/pnas.1505995112] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Ran is a small GTP-binding protein of the Ras superfamily regulating fundamental cellular processes: nucleo-cytoplasmic transport, nuclear envelope formation and mitotic spindle assembly. An intracellular Ran•GTP/Ran•GDP gradient created by the distinct subcellular localization of its regulators RCC1 and RanGAP mediates many of its cellular effects. Recent proteomic screens identified five Ran lysine acetylation sites in human and eleven sites in mouse/rat tissues. Some of these sites are located in functionally highly important regions such as switch I and switch II. Here, we show that lysine acetylation interferes with essential aspects of Ran function: nucleotide exchange and hydrolysis, subcellular Ran localization, GTP hydrolysis, and the interaction with import and export receptors. Deacetylation activity of certain sirtuins was detected for two Ran acetylation sites in vitro. Moreover, Ran was acetylated by CBP/p300 and Tip60 in vitro and on transferase overexpression in vivo. Overall, this study addresses many important challenges of the acetylome field, which will be discussed.
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11
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Daimi H, Lozano-Velasco E, Haj Khelil A, Chibani JBE, Barana A, Amorós I, González de la Fuente M, Caballero R, Aranega A, Franco D. Regulation of SCN5A by microRNAs: miR-219 modulates SCN5A transcript expression and the effects of flecainide intoxication in mice. Heart Rhythm 2015; 12:1333-42. [PMID: 25701775 DOI: 10.1016/j.hrthm.2015.02.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Indexed: 01/08/2023]
Abstract
BACKGROUND The human cardiac action potential in atrial and ventricular cells is initiated by a fast-activating, fast-inactivating sodium current generated by the SCN5A/Nav1.5 channel in association with its β1/SCN1B subunit. The role of Nav1.5 in the etiology of many cardiac diseases strongly suggests that proper regulation of cell biology and function of the channel is critical for normal cardiac function. Hence, numerous recent studies have focused on the regulatory mechanisms of Nav1.5 biosynthetic and degradation processes as well as its subcellular localization. OBJECTIVE The purpose of this study was to investigate the role of microRNAs in the Scn5a/Nav1.5 posttranscriptional regulation. METHODS Quantitative polymerase chain reaction, immunohistochemical and electrophysiological measurements of distinct microRNA gain-of-function experiments in cardiomyocytes for the assessment of Scn5a expression. RESULTS Functional studies of HL-1 cardiomyocytes and luciferase assays in fibroblasts demonstrate that Scn5a is directly (miR-98, miR-106, miR-200, and miR-219) and indirectly (miR-125 and miR-153) regulated by multiple microRNAs displaying distinct time-dependent profiles. Cotransfection experiments demonstrated that miR-219 and miR-200 have independent opposite effects on Scn5a expression modulation. Of all the microRNAs studied, only miR-219 increases Scn5a expression levels, leading to altered contraction rhythm of HL-1 cardiomyocytes. Electrophysiological analyses in HL-1 cells revealed that miR-219 increases the sodium current. In vivo administration of miR-219 does not alter normal cardiac rhythm, but abolishes some of the effects of flecainide intoxication in mice, particularly QRS prolongation. CONCLUSION This study demonstrates the involvement of multiple microRNAs in the regulation of Scn5a. Particularly, miR-219 increases Scn5a/Nav1.5 transcript and protein expression. Our data suggest that microRNAs, such as miR-219, constitute a promising therapeutical tool to treat sodium cardiac arrhythmias.
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Affiliation(s)
- Houria Daimi
- Department of Experimental Biology, University of Jaén, Jáen, Spain; Biochemistry and Molecular Biology Laboratory, Faculty of Pharmacy, University of Monastir, Monastir, Tunisia
| | | | - Amel Haj Khelil
- Biochemistry and Molecular Biology Laboratory, Faculty of Pharmacy, University of Monastir, Monastir, Tunisia
| | - Jemni B E Chibani
- Biochemistry and Molecular Biology Laboratory, Faculty of Pharmacy, University of Monastir, Monastir, Tunisia
| | - Adriana Barana
- Department of Pharmacology, Faculty of Medicine, Complutense University of Madrid, Madrid, Spain
| | - Irene Amorós
- Department of Pharmacology, Faculty of Medicine, Complutense University of Madrid, Madrid, Spain
| | | | - Ricardo Caballero
- Department of Pharmacology, Faculty of Medicine, Complutense University of Madrid, Madrid, Spain
| | - Amelia Aranega
- Department of Experimental Biology, University of Jaén, Jáen, Spain
| | - Diego Franco
- Department of Experimental Biology, University of Jaén, Jáen, Spain.
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12
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Manlandro CMA, Palanivel VR, Schorr EB, Mihatov N, Antony AA, Rosenwald AG. Mon2 is a negative regulator of the monomeric G protein, Arl1. FEMS Yeast Res 2012; 12:637-50. [PMID: 22594927 DOI: 10.1111/j.1567-1364.2012.00814.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 04/27/2012] [Accepted: 05/11/2012] [Indexed: 11/30/2022] Open
Abstract
Using site-directed mutants of ARL1 predicted to alter nucleotide binding, we examined phenotypes associated with the loss of ARL1 , including effects on membrane traffic and K (+) homeostasis. The GTP-restricted allele, ARL[Q72L] , complemented the membrane traffic phenotype (CPY secretion), but not the K (+) homeostasis phenotypes (sensitivity to hygromycin B, steady-state levels of K (+) , and accumulation of (86) Rb (+) ), while the XTP-restricted mutant, ARL1[D130N] , complemented the ion phenotypes, but not the membrane traffic phenotype. A GDP-restricted allele, ARL1[T32N] , did not effectively complement either phenotype. These results are consistent with a model in which Arl1 has three different conformations in vivo. We also explored the relationship between ARL1 and MON2 using the synthetic lethal phenotype exhibited by these two genes and demonstrated that MON2 is a negative regulator of the GTP-restricted allele of ARL1 , ARL1[Q72L] . Finally, we constructed several new alleles predicted to alter binding of Arl1 to the sole GRIP domain containing protein in yeast, Imh1, and found that ARL1[F52G] and ARL1[Y82G] were unable to complement the loss of ARL1 with respect to either the membrane traffic or K (+) homeostasis phenotypes. Our study expands understanding of the roles of Arl1 in vivo.
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13
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Jackson SA, Hinds MG, Eaton-Rye JJ. Solution structure of CyanoP from Synechocystis sp. PCC 6803: new insights on the structural basis for functional specialization amongst PsbP family proteins. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:1331-8. [PMID: 22414666 DOI: 10.1016/j.bbabio.2012.02.032] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Revised: 02/19/2012] [Accepted: 02/27/2012] [Indexed: 11/26/2022]
Abstract
The structure of the CyanoP subunit of photosystem II from the cyanobacterium Synechocystis sp. PCC 6803 has been determined in solution by Nuclear Magnetic Resonance spectroscopy. Combined with homology modeling of PsbP-like structures we have identified distinct structural differences between PsbP homologues which may account for the functional differences apparent between members of this protein family. A surface cleft containing a large number of conserved residues found only in CyanoP and PsbP-like homologues has been identified and our findings suggest that one of the potential cation binding sites found in CyanoP may be functionally significant. Evidence for the evolution and divergence of the PsbP super family is presented from a structural perspective including identification of residues which distinguish the PsbP family from unrelated proteins with a similar domain fold. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial.
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Affiliation(s)
- Simon A Jackson
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
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14
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Michoux F, Takasaka K, Boehm M, Nixon PJ, Murray JW. Structure of CyanoP at 2.8 A: implications for the evolution and function of the PsbP subunit of photosystem II . Biochemistry 2010; 49:7411-3. [PMID: 20698571 DOI: 10.1021/bi1011145] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We present here the crystal structure of CyanoP (Tlr2075) from Thermosynechococcus elongatus at 2.8 A. CyanoP is a substoichiometric component of the isolated cyanobacterial Photosystem II (PSII) complex, distantly related to the PsbP extrinsic subunit of the oxygen-evolving PSII complex in higher plants and green algae. Despite the relatively low degree of sequence similarity, we have found that CyanoP adopts the same beta-sandwich fold as higher-plant PsbP and contains a well-conserved metal (zinc)-binding site that is also present in plant PsbP. Our results support the idea that CyanoP represents the basal structural fold of the PsbP superfamily.
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Affiliation(s)
- Franck Michoux
- Division of Biology, Wolfson Biochemistry Building, Imperial College London,South Kensington Campus, London SW7 2AZ, UK
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15
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Morissette DC, Dauch A, Beech R, Masson L, Brousseau R, Jabaji-Hare S. Isolation of mycoparasitic-related transcripts by SSH during interaction of the mycoparasite Stachybotrys elegans with its host Rhizoctonia solani. Curr Genet 2007; 53:67-80. [PMID: 18058103 DOI: 10.1007/s00294-007-0166-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2007] [Revised: 10/31/2007] [Accepted: 11/13/2007] [Indexed: 11/25/2022]
Abstract
Mycoparasitism by antagonistic fungi involves changes in the biochemistry and physiology of both partners. Analysis of genes that are expressed during mycoparasite-host interaction represents a powerful strategy to obtain insight into the molecular events underlying these changes. The aim of this study is to identify genes whose expression is upregulated when the mycoparasite Stachybotrys elegans is in direct confrontation with its host Rhizoctonia solani. Suppression subtractive hybridization (SSH) was used to create a subtracted cDNA library, and differential screening was applied to identify the over-expressed transcripts. We report the analysis of 2,166 clones, among which 47% were upregulated during mycoparasitism. Two hundred and sixty-one clones were sequenced that corresponded to 94 unique genes. Forty-four of these were identified as novel genes, while the remainder showed similarity to a broad diversity of genes with putative functions related to toxin production, pathogenicity, and metabolism. As a result of mycoparasitism, 15 genes belonged to R. solani among which 9 genes were assigned putative functions. Quantitative RT-PCR was used to examine the upregulation of 12 genes during the course of mycoparasitism. Seven genes showed significant upregulation at least at one-time point during interaction of the mycoparasite with its host. This study describes a first step toward knowledge of S. elegans genome. The results present the useful application of EST analysis on S. elegans and provide preliminary indication of gene expression putatively involved in mycoparasitism.
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16
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Kelley JB, Paschal BM. Hyperosmotic stress signaling to the nucleus disrupts the Ran gradient and the production of RanGTP. Mol Biol Cell 2007; 18:4365-76. [PMID: 17761537 PMCID: PMC2043571 DOI: 10.1091/mbc.e07-01-0089] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The RanGTP gradient depends on nucleocytoplasmic shuttling of Ran and its nucleotide exchange in the nucleus. Here we show that hyperosmotic stress signaling induced by sorbitol disrupts the Ran protein gradient and reduces the production of RanGTP. Ran gradient disruption is rapid and is followed by early (10-20 min) and late (30-60 min) phases of recovery. Results from SB203580 and siRNA experiments suggest the stress kinase p38 is important for Ran gradient recovery. NTF2 and Mog1, which are transport factors that regulate the nuclear localization of Ran, showed kinetics of delocalization and recovery similar to Ran. Microinjection of a nuclear localization signal reporter protein revealed that sorbitol stress decreases the rate of nuclear import. Sorbitol stress also slowed RCC1 mobility in the nucleus, which is predicted to reduce RCC1 dissociation from chromatin and RanGTP production. This was tested using a FRET biosensor that registers nuclear RanGTP levels, which were reduced in response to sorbitol stress. Although sorbitol alters nucleotide levels, we show that inverting the GTP/GDP ratio in cells is not sufficient to disrupt the Ran gradient. Thus, the Ran system is a target of hyperosmotic stress signaling, and cells use protein localization-based mechanisms as part of a rapid stress response.
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Affiliation(s)
- Joshua B. Kelley
- Center for Cell Signaling, Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA 22908
| | - Bryce M. Paschal
- Center for Cell Signaling, Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA 22908
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17
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Xu Q, Krishna SS, McMullan D, Schwarzenbacher R, Miller MD, Abdubek P, Agarwalla S, Ambing E, Astakhova T, Axelrod HL, Canaves JM, Carlton D, Chiu HJ, Clayton T, DiDonato M, Duan L, Elsliger MA, Feuerhelm J, Grzechnik SK, Hale J, Hampton E, Han GW, Haugen J, Jaroszewski L, Jin KK, Klock HE, Knuth MW, Koesema E, Kreusch A, Kuhn P, Morse AT, Nigoghossian E, Okach L, Oommachen S, Paulsen J, Quijano K, Reyes R, Rife CL, Spraggon G, Stevens RC, van den Bedem H, White A, Wolf G, Hodgson KO, Wooley J, Deacon AM, Godzik A, Lesley SA, Wilson IA. Crystal structure of an ORFan protein (TM1622) from Thermotoga maritima at 1.75 A resolution reveals a fold similar to the Ran-binding protein Mog1p. Proteins 2007; 65:777-82. [PMID: 16948158 DOI: 10.1002/prot.21015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Bradford JR, Needham CJ, Bulpitt AJ, Westhead DR. Insights into protein-protein interfaces using a Bayesian network prediction method. J Mol Biol 2006; 362:365-86. [PMID: 16919296 DOI: 10.1016/j.jmb.2006.07.028] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2006] [Revised: 06/15/2006] [Accepted: 07/13/2006] [Indexed: 11/26/2022]
Abstract
Identifying the interface between two interacting proteins provides important clues to the function of a protein, and is becoming increasing relevant to drug discovery. Here, surface patch analysis was combined with a Bayesian network to predict protein-protein binding sites with a success rate of 82% on a benchmark dataset of 180 proteins, improving by 6% on previous work and well above the 36% that would be achieved by a random method. A comparable success rate was achieved even when evolutionary information was missing, a further improvement on our previous method which was unable to handle incomplete data automatically. In a case study of the Mog1p family, we showed that our Bayesian network method can aid the prediction of previously uncharacterised binding sites and provide important clues to protein function. On Mog1p itself a putative binding site involved in the SLN1-SKN7 signal transduction pathway was detected, as was a Ran binding site, previously characterized solely by conservation studies, even though our automated method operated without using homologous proteins. On the remaining members of the family (two structural genomics targets, and a protein involved in the photosystem II complex in higher plants) we identified novel binding sites with little correspondence to those on Mog1p. These results suggest that members of the Mog1p family bind to different proteins and probably have different functions despite sharing the same overall fold. We also demonstrated the applicability of our method to drug discovery efforts by successfully locating a number of binding sites involved in the protein-protein interaction network of papilloma virus infection. In a separate study, we attempted to distinguish between the two types of binding site, obligate and non-obligate, within our dataset using a second Bayesian network. This proved difficult although some separation was achieved on the basis of patch size, electrostatic potential and conservation. Such was the similarity between the two interacting patch types, we were able to use obligate binding site properties to predict the location of non-obligate binding sites and vice versa.
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Affiliation(s)
- James R Bradford
- Institute of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, UK
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19
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Lu JMY, Deschenes RJ, Fassler JS. Role for the Ran binding protein, Mog1p, in Saccharomyces cerevisiae SLN1-SKN7 signal transduction. EUKARYOTIC CELL 2005; 3:1544-56. [PMID: 15590828 PMCID: PMC539023 DOI: 10.1128/ec.3.6.1544-1556.2004] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Yeast Sln1p is an osmotic stress sensor with histidine kinase activity. Modulation of Sln1 kinase activity in response to changes in the osmotic environment regulates the activity of the osmotic response mitogen-activated protein kinase pathway and the activity of the Skn7p transcription factor, both important for adaptation to changing osmotic stress conditions. Many aspects of Sln1 function, such as how kinase activity is regulated to allow a rapid response to the continually changing osmotic environment, are not understood. To gain insight into Sln1p function, we conducted a two-hybrid screen to identify interactors. Mog1p, a protein that interacts with the yeast Ran1 homolog, Gsp1p, was identified in this screen. The interaction with Mog1p was characterized in vitro, and its importance was assessed in vivo. mog1 mutants exhibit defects in SLN1-SKN7 signal transduction and mislocalization of the Skn7p transcription factor. The requirement for Mog1p in normal localization of Skn7p to the nucleus does not fully account for the mog1-related defects in SLN1-SKN7 signal transduction, raising the possibility that Mog1p may play a role in Skn7 binding and activation of osmotic response genes.
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Affiliation(s)
- Jade Mei-Yeh Lu
- Department of Biological Sciences, University of Iowa, 202 BBE, Iowa City, IA 52242, USA
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20
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Riddick G, Macara IG. A systems analysis of importin-{alpha}-{beta} mediated nuclear protein import. J Cell Biol 2005; 168:1027-38. [PMID: 15795315 PMCID: PMC2171841 DOI: 10.1083/jcb.200409024] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2004] [Accepted: 02/16/2005] [Indexed: 11/22/2022] Open
Abstract
Importin-beta (Impbeta) is a major transport receptor for Ran-dependent import of nuclear cargo. Impbeta can bind cargo directly or through an adaptor such as Importin-alpha (Impalpha). Factors involved in nuclear transport have been well studied, but systems analysis can offer further insight into regulatory mechanisms. We used computer simulation and real-time assays in intact cells to examine Impalpha-beta-mediated import. The model reflects experimentally determined rates for cargo import and correctly predicts that import is limited principally by Impalpha and Ran, but is also sensitive to NTF2. The model predicts that CAS is not limiting for the initial rate of cargo import and, surprisingly, that increased concentrations of Impbeta and the exchange factor, RCC1, actually inhibit rather than stimulate import. These unexpected predictions were all validated experimentally. The model revealed that inhibition by RCC1 is caused by sequestration of nuclear Ran. Inhibition by Impbeta results from depletion nuclear RanGTP, and, in support of this mechanism, expression of mRFP-Ran reversed the inhibition.
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Affiliation(s)
- Gregory Riddick
- Center for Cell Signaling, Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
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21
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Merchant M, Vajdos FF, Ultsch M, Maun HR, Wendt U, Cannon J, Desmarais W, Lazarus RA, de Vos AM, de Sauvage FJ. Suppressor of fused regulates Gli activity through a dual binding mechanism. Mol Cell Biol 2004; 24:8627-41. [PMID: 15367681 PMCID: PMC516763 DOI: 10.1128/mcb.24.19.8627-8641.2004] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The Hedgehog pathway drives proliferation and differentiation by activating the Gli/Ci family of zinc finger transcription factors. Gli/Ci proteins form Hedgehog signaling complexes with other signaling components, including the kinesin-like protein Costal-2, the serine-threonine kinase Fused, and Suppressor of Fused [Su(fu)]. In these complexes Gli/Ci proteins are regulated by cytoplasmic sequestration, phosphorylation, and proteolysis. Here we characterize structural and functional determinants of Su(fu) required for Gli regulation and show that Su(fu) contains at least two distinct domains: a highly conserved carboxy-terminal region required for binding to the amino-terminal ends of the Gli proteins and a unique amino-terminal domain that binds the carboxy-terminal tail of Gli1. While each domain is capable of binding to different Gli1 regions independently, interactions between Su(fu) and Gli1 at both sites are required for cytoplasmic tethering and repression of Gli1. Furthermore, we have solved the crystal structure of the amino-terminal domain of human Su(fu)(27-268) at 2.65 A resolution. This domain forms a concave pocket with a prominent acidic patch. Mutation at Asp(159) in the acidic patch disrupts Gli1 tethering and repression while not strongly disrupting binding, indicating that the amino-terminal domain of Su(fu) likely impacts Gli binding through a mechanism distinct from that for tethering and repression. These studies provide a structural basis for understanding the function of Su(fu).
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Affiliation(s)
- Mark Merchant
- Department of Molecular Biology, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA.
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22
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Ifuku K, Nakatsu T, Kato H, Sato F. Crystal structure of the PsbP protein of photosystem II from Nicotiana tabacum. EMBO Rep 2004; 5:362-7. [PMID: 15031714 PMCID: PMC1299024 DOI: 10.1038/sj.embor.7400113] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2003] [Revised: 01/16/2004] [Accepted: 01/26/2004] [Indexed: 11/09/2022] Open
Abstract
PsbP is a membrane-extrinsic subunit of the water-oxidizing complex photosystem II (PS II). The evolutionary origin of PsbP has long been a mystery because it specifically exists in higher plants and green algae but not in cyanobacteria. We report here the crystal structure of PsbP from Nicotiana tabacum at a resolution of 1.6 A. Its structure is mainly composed of beta-sheet, and is not similar to any structures in cyanobacterial PS II. However, the electrostatic surface potential of PsbP is similar to that of cyanobacterial PsbV (cyt c(550)), which has a function similar to PsbP. A structural homology search with the DALI algorithm indicated that the folding of PsbP is very similar to that of Mog1p, a regulatory protein for the nuclear transport of Ran GTPase. The structure of PsbP provides insight into its novel function in GTP-regulated metabolism in PS II.
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Affiliation(s)
- Kentaro Ifuku
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
- Membrane Dynamics Research Group, RIKEN Harima Institute at SPring-8, Hyogo, Japan
| | - Toru Nakatsu
- Membrane Dynamics Research Group, RIKEN Harima Institute at SPring-8, Hyogo, Japan
- Department of Structural Biology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Hiroaki Kato
- Membrane Dynamics Research Group, RIKEN Harima Institute at SPring-8, Hyogo, Japan
- Department of Structural Biology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Fumihiko Sato
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
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Abstract
Transport of macromolecules between the cytoplasm and the nucleus is mediated by at least three different classes of soluble transport receptors, members of the importin-beta protein family, the Mex67/Tap family and the small nuclear transport factor 2 (NFT2). All nuclear transport factors can bidirectionally traverse the nuclear pore complex through specific interactions with phenylalanine/glycine-rich nuclear pore complex components. Recent kinetic and structural analyses revealed novel insight into the details of these interactions. In addition, new biochemical and genetic studies have dramatically improved our understanding of ribosomal and messenger RNA export, unveiling a tight coupling between RNA processing and transport.
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Affiliation(s)
- Karsten Weis
- Department of Molecular Biology, Division of Cell and Developmental Biology, University of California, Berkeley, CA 94720-3200, USA.
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