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Jin L, Li ZF, Wang DK, Sun M, Qi W, Ma Q, Zhang L, Chu C, Chan EY, Lee SS, Wise H, To KF, Shi Y, Zhou N, Cheung WT. Molecular and functional characterization of tumor-induced factor (TIF): Hamster homolog of CXCL3 (GROγ) displays tumor suppressive activity. Cytokine 2018; 102:62-75. [DOI: 10.1016/j.cyto.2017.12.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 12/11/2017] [Accepted: 12/15/2017] [Indexed: 12/20/2022]
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Tirupula KC, Zhang D, Osbourne A, Chatterjee A, Desnoyer R, Willard B, Karnik SS. MAS C-Terminal Tail Interacting Proteins Identified by Mass Spectrometry- Based Proteomic Approach. PLoS One 2015; 10:e0140872. [PMID: 26484771 PMCID: PMC4618059 DOI: 10.1371/journal.pone.0140872] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 10/01/2015] [Indexed: 11/19/2022] Open
Abstract
Propagation of signals from G protein-coupled receptors (GPCRs) in cells is primarily mediated by protein-protein interactions. MAS is a GPCR that was initially discovered as an oncogene and is now known to play an important role in cardiovascular physiology. Current literature suggests that MAS interacts with common heterotrimeric G-proteins, but MAS interaction with proteins which might mediate G protein-independent or atypical signaling is unknown. In this study we hypothesized that MAS C-terminal tail (Ct) is a major determinant of receptor-scaffold protein interactions mediating MAS signaling. Mass-spectrometry based proteomic analysis was used to comprehensively identify the proteins that interact with MAS Ct comprising the PDZ-binding motif (PDZ-BM). We identified both PDZ and non-PDZ proteins from human embryonic kidney cell line, mouse atrial cardiomyocyte cell line and human heart tissue to interact specifically with MAS Ct. For the first time our study provides a panel of PDZ and other proteins that potentially interact with MAS with high significance. A ‘cardiac-specific finger print’ of MAS interacting PDZ proteins was identified which includes DLG1, MAGI1 and SNTA. Cell based experiments with wild-type and mutant MAS lacking the PDZ-BM validated MAS interaction with PDZ proteins DLG1 and TJP2. Bioinformatics analysis suggested well-known multi-protein scaffold complexes involved in nitric oxide signaling (NOS), cell-cell signaling of neuromuscular junctions, synapses and epithelial cells. Majority of these protein hits were predicted to be part of disease categories comprising cancers and malignant tumors. We propose a ‘MAS-signalosome’ model to stimulate further research in understanding the molecular mechanism of MAS function. Identifying hierarchy of interactions of ‘signalosome’ components with MAS will be a necessary step in future to fully understand the physiological and pathological functions of this enigmatic receptor.
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Affiliation(s)
- Kalyan C. Tirupula
- Department of Molecular Cardiology, Cleveland Clinic, Ohio, United States of America
| | - Dongmei Zhang
- Proteomics Laboratory, Lerner Research Institute, Cleveland Clinic, Ohio, United States of America
| | - Appledene Osbourne
- Cleveland Clinic Lerner College of Medicine at Case Western Reserve University, Cleveland Clinic, Ohio, United States of America
| | - Arunachal Chatterjee
- Department of Molecular Cardiology, Cleveland Clinic, Ohio, United States of America
| | - Russ Desnoyer
- Department of Molecular Cardiology, Cleveland Clinic, Ohio, United States of America
| | - Belinda Willard
- Proteomics Laboratory, Lerner Research Institute, Cleveland Clinic, Ohio, United States of America
| | - Sadashiva S. Karnik
- Department of Molecular Cardiology, Cleveland Clinic, Ohio, United States of America
- Cleveland Clinic Lerner College of Medicine at Case Western Reserve University, Cleveland Clinic, Ohio, United States of America
- * E-mail:
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Jiang L, Teng GMK, Chan EYM, Au SWN, Wise H, Lee SST, Cheung WT. Impact of cell type and epitope tagging on heterologous expression of G protein-coupled receptor: a systematic study on angiotensin type II receptor. PLoS One 2012; 7:e47016. [PMID: 23056563 PMCID: PMC3466278 DOI: 10.1371/journal.pone.0047016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Accepted: 09/11/2012] [Indexed: 12/19/2022] Open
Abstract
Despite heterologous expression of epitope-tagged GPCR is widely adopted for functional characterization, there is lacking of systematic analysis of the impact of expression host and epitope tag on GPCR expression. Angiotensin type II (AT2) receptor displays agonist-dependent and -independent activities, coupling to a spectrum of signaling molecules. However, consensus has not been reached on the subcellular distributions, signaling cascades and receptor-mediated actions. To examine the contributions of host cell and epitope tag on receptor expression and activity, epitope-tagged AT2 receptor variants were transiently or stably expressed in HEK293, CHO-K1 and PC12 cells. The epitope-tagged AT2 receptor variants were detected both on the cell membrane and in the perinuclear region. In transiently transfected HEK293 cells, Myc-AT2 existed predominantly as monomer. Additionally, a ladder of ubiquitinated AT2 receptor proteins was detected. By contrast, stably expressed epitope-tagged AT2 receptor variants existed as both monomer and high molecular weight complexes, and the latter was enriched in cell surface. Glycosylation promoted cell surface expression of Myc-AT2 but had no effect on AT2-GFP in HEK293 cells. In cells that stably expressed Myc-AT2, serum starvation induced apoptosis in CHO-K1 cells but not in HEK293 or PC12 cells. Instead, HEK293 and PC12 cells stably expressing Myc-AT2 exhibited partial cell cycle arrest with cells accumulating at G1 and S phases, respectively. Taken together, these results suggest that expression levels, subcellular distributions and ligand-independent constitutive activities of AT2 receptor were cell type-dependent while posttranslational processing of nascent AT2 receptor protein was modulated by epitope tag and mode of expression.
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Affiliation(s)
- Lili Jiang
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Gladys M. K. Teng
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Elaine Y. M. Chan
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Shannon W. N. Au
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Helen Wise
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Susanna S. T. Lee
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
- * E-mail: (WTC); (SL)
| | - Wing-Tai Cheung
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
- * E-mail: (WTC); (SL)
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