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Cheng J, Yang Z, Ge XY, Gao MX, Meng R, Xu X, Zhang YQ, Li RZ, Lin JY, Tian ZM, Wang J, Ning SL, Xu YF, Yang F, Gu JK, Sun JP, Yu X. Autonomous sensing of the insulin peptide by an olfactory G protein-coupled receptor modulates glucose metabolism. Cell Metab 2022; 34:240-255.e10. [PMID: 35108512 DOI: 10.1016/j.cmet.2021.12.022] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/15/2021] [Accepted: 12/22/2021] [Indexed: 12/16/2022]
Abstract
Along with functionally intact insulin, diabetes-associated insulin peptides are secreted by β cells. By screening the expression and functional characterization of olfactory receptors (ORs) in pancreatic islets, we identified Olfr109 as the receptor that detects insulin peptides. The engagement of one insulin peptide, insB:9-23, with Olfr109 diminished insulin secretion through Gi-cAMP signaling and promoted islet-resident macrophage proliferation through a β cell-macrophage circuit and a β-arrestin-1-mediated CCL2 pathway, as evidenced by β-arrestin-1-/- mouse models. Systemic Olfr109 deficiency or deficiency induced by Pdx1-Cre+/-Olfr109fl/fl specifically alleviated intra-islet inflammatory responses and improved glucose homeostasis in Akita- and high-fat diet (HFD)-fed mice. We further determined the binding mode between insB:9-23 and Olfr109. A pepducin-based Olfr109 antagonist improved glucose homeostasis in diabetic and obese mouse models. Collectively, we found that pancreatic β cells use Olfr109 to autonomously detect self-secreted insulin peptides, and this detection arrests insulin secretion and crosstalks with macrophages to increase intra-islet inflammation.
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Affiliation(s)
- Jie Cheng
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Zhao Yang
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China; Advanced Medical Research Institute, Shandong University, Jinan, Shandong 250012, China
| | - Xiao-Yan Ge
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Ming-Xin Gao
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Ran Meng
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Xin Xu
- Research Center for Drug Metabolism, College of Life Sciences, Jilin University, Changchun, Jilin 130012, China
| | - Yu-Qi Zhang
- Research Center for Drug Metabolism, College of Life Sciences, Jilin University, Changchun, Jilin 130012, China
| | - Rui-Zhe Li
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Jing-Yu Lin
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Zhao-Mei Tian
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Jin Wang
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Shang-Lei Ning
- Department of General Surgery, Qilu Hospital of Shandong University, Jinan, Shandong 250012, China
| | - Yun-Fei Xu
- Department of General Surgery, Qilu Hospital of Shandong University, Jinan, Shandong 250012, China
| | - Fan Yang
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China; Advanced Medical Research Institute, Shandong University, Jinan, Shandong 250012, China
| | - Jing-Kai Gu
- Research Center for Drug Metabolism, College of Life Sciences, Jilin University, Changchun, Jilin 130012, China
| | - Jin-Peng Sun
- Advanced Medical Research Institute, Shandong University, Jinan, Shandong 250012, China; Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing 100191, China.
| | - Xiao Yu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong 250012, China.
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2
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Liu GP, Lei P, Dong ZF, Li SP. Editorial: The Molecular Mechanisms of Synaptic Plasticity Impairments in Alzheimer’s Disease. Front Cell Dev Biol 2022; 10:832728. [PMID: 35127687 PMCID: PMC8814519 DOI: 10.3389/fcell.2022.832728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 01/06/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Gong-Ping Liu
- Key Laboratory of Ministry of Education of China and Hubei Province for Neurological Disorders, Department of Pathophysiology, School of Basic Medicine, The Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, China
- *Correspondence: Gong-Ping Liu,
| | - Peng Lei
- Department of Neurology and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Zhi-Fang Dong
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, National Clinical Research Center for Child Health and Disorders, Children’s Hospital of Chongqing Medical University, Chongqing, China
| | - Shu-Peng Li
- School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, China
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3
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Structure, function and pharmacology of human itch receptor complexes. Nature 2021; 600:164-169. [PMID: 34789875 DOI: 10.1038/s41586-021-04077-y] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 09/30/2021] [Indexed: 11/08/2022]
Abstract
In the clades of animals that diverged from the bony fish, a group of Mas-related G-protein-coupled receptors (MRGPRs) evolved that have an active role in itch and allergic signals1,2. As an MRGPR, MRGPRX2 is known to sense basic secretagogues (agents that promote secretion) and is involved in itch signals and eliciting pseudoallergic reactions3-6. MRGPRX2 has been targeted by drug development efforts to prevent the side effects induced by certain drugs or to treat allergic diseases. Here we report a set of cryo-electron microscopy structures of the MRGPRX2-Gi1 trimer in complex with polycationic compound 48/80 or with inflammatory peptides. The structures of the MRGPRX2-Gi1 complex exhibited shallow, solvent-exposed ligand-binding pockets. We identified key common structural features of MRGPRX2 and describe a consensus motif for peptidic allergens. Beneath the ligand-binding pocket, the unusual kink formation at transmembrane domain 6 (TM6) and the replacement of the general toggle switch from Trp6.48 to Gly6.48 (superscript annotations as per Ballesteros-Weinstein nomenclature) suggest a distinct activation process. We characterized the interfaces of MRGPRX2 and the Gi trimer, and mapped the residues associated with key single-nucleotide polymorphisms on both the ligand and G-protein interfaces of MRGPRX2. Collectively, our results provide a structural basis for the sensing of cationic allergens by MRGPRX2, potentially facilitating the rational design of therapies to prevent unwanted pseudoallergic reactions.
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4
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Carvajal FJ, Cerpa W. Regulation of Phosphorylated State of NMDA Receptor by STEP 61 Phosphatase after Mild-Traumatic Brain Injury: Role of Oxidative Stress. Antioxidants (Basel) 2021; 10:antiox10101575. [PMID: 34679709 PMCID: PMC8533270 DOI: 10.3390/antiox10101575] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 09/14/2021] [Accepted: 09/28/2021] [Indexed: 01/21/2023] Open
Abstract
Traumatic Brain Injury (TBI) mediates neuronal death through several events involving many molecular pathways, including the glutamate-mediated excitotoxicity for excessive stimulation of N-methyl-D-aspartate receptors (NMDARs), producing activation of death signaling pathways. However, the contribution of NMDARs (distribution and signaling-associated to the distribution) remains incompletely understood. We propose a critical role of STEP61 (Striatal-Enriched protein tyrosine phosphatase) in TBI; this phosphatase regulates the dephosphorylated state of the GluN2B subunit through two pathways: by direct dephosphorylation of tyrosine-1472 and indirectly via dephosphorylation and inactivation of Fyn kinase. We previously demonstrated oxidative stress’s contribution to NMDAR signaling and distribution using SOD2+/− mice such a model. We performed TBI protocol using a controlled frontal impact device using C57BL/6 mice and SOD2+/− animals. After TBI, we found alterations in cognitive performance, NMDAR-dependent synaptic function (decreased synaptic form of NMDARs and decreased synaptic current NMDAR-dependent), and increased STEP61 activity. These changes are reduced partially with the STEP61-inhibitor TC-2153 treatment in mice subjected to TBI protocol. This study contributes with evidence about the role of STEP61 in the neuropathological progression after TBI and also the alteration in their activity, such as an early biomarker of synaptic damage in traumatic lesions.
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Affiliation(s)
- Francisco J. Carvajal
- Laboratorio de Función y Patología Neuronal, Centro de Envejecimiento y Regeneración (CARE), Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile;
- Centro de Excelencia en Biomedicina de Magallanes (CEBIMA), Universidad de Magallanes, Punta Arenas 6200000, Chile
| | - Waldo Cerpa
- Laboratorio de Función y Patología Neuronal, Centro de Envejecimiento y Regeneración (CARE), Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile;
- Centro de Excelencia en Biomedicina de Magallanes (CEBIMA), Universidad de Magallanes, Punta Arenas 6200000, Chile
- Correspondence: ; Tel.: +56-2-2354-2656; Fax: +56-2-2354-2660
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5
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Mahaman YAR, Huang F, Embaye KS, Wang X, Zhu F. The Implication of STEP in Synaptic Plasticity and Cognitive Impairments in Alzheimer's Disease and Other Neurological Disorders. Front Cell Dev Biol 2021; 9:680118. [PMID: 34195199 PMCID: PMC8236946 DOI: 10.3389/fcell.2021.680118] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 05/06/2021] [Indexed: 12/31/2022] Open
Abstract
STriatal-Enriched protein tyrosine Phosphatase (STEP) is a tyrosine phosphatase that has been implicated in Alzheimer’s disease (AD), the most common form of dementia, and many other neurological diseases. The protein level and activity of STEP have been found to be elevated in most of these disorders, and specifically in AD as a result of dysregulation of different pathways including PP2B/DARPP32/PP1, PKA as well as impairments of both proteasomal and lysosomal systems. The upregulation in STEP leads to increased binding to, and dephosphorylation of, its substrates which are mainly found to be synaptic plasticity and thus learning and memory related proteins. These proteins include kinases like Fyn, Pyk2, ERK1/2 and both NMDA and AMPA receptor subunits GluN2B and GluA2. The dephosphorylation of these molecules results in inactivation of these kinases and internalization of NMDA and AMPA receptor complexes leading to synapse loss and cognitive impairments. In this study, we aim to review STEP regulation and its implications in AD as well as other neurological disorders and then summarize data on targeting STEP as therapeutic strategy in these diseases.
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Affiliation(s)
- Yacoubou Abdoul Razak Mahaman
- Cognitive Impairment Ward of Neurology Department, The Third Affiliated Hospital, Shenzhen University, Shenzhen, China.,Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fang Huang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Kidane Siele Embaye
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaochuan Wang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Feiqi Zhu
- Cognitive Impairment Ward of Neurology Department, The Third Affiliated Hospital, Shenzhen University, Shenzhen, China
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6
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Chatterjee M, Kwon J, Benedict J, Kamceva M, Kurup P, Lombroso PJ. STEP inhibition prevents Aβ-mediated damage in dendritic complexity and spine density in Alzheimer's disease. Exp Brain Res 2021; 239:881-890. [PMID: 33420799 DOI: 10.1007/s00221-020-06028-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 12/28/2020] [Indexed: 11/30/2022]
Abstract
Loss of dendritic spines and decline of cognitive function are hallmarks of patients with Alzheimer's disease (AD). Previous studies have shown that AD pathophysiology involves increased expression of a central nervous system-enriched protein tyrosine phosphatase called STEP (STriatal-Enriched protein tyrosine Phosphatase). STEP opposes the development of synaptic strengthening by dephosphorylating substrates, including GluN2B, Pyk2, and ERK1/2. Genetic reduction of STEP as well as pharmacological inhibition of STEP improve cognitive function and hippocampal memory in the 3×Tg-AD mouse model. Here, we show that the improved cognitive function is accompanied by an increase in synaptic connectivity in cell cultures as well as in the triple transgenic AD mouse model, further highlighting the potential of STEP inhibitors as a therapeutic agent.
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Affiliation(s)
- Manavi Chatterjee
- Child Study Center, Yale University, 230 South Frontage Rd, New Haven, CT, 06520, USA.
| | - Jeemin Kwon
- Child Study Center, Yale University, 230 South Frontage Rd, New Haven, CT, 06520, USA
| | - Jessie Benedict
- Child Study Center, Yale University, 230 South Frontage Rd, New Haven, CT, 06520, USA
| | - Marija Kamceva
- Child Study Center, Yale University, 230 South Frontage Rd, New Haven, CT, 06520, USA
| | - Pradeep Kurup
- Child Study Center, Yale University, 230 South Frontage Rd, New Haven, CT, 06520, USA.,Department of Surgery, University of Alabama at Birmingham, 1900 University Blvd, Birmingham, AL, 35233, United States
| | - Paul J Lombroso
- Child Study Center, Yale University, 230 South Frontage Rd, New Haven, CT, 06520, USA. .,Departments of Psychiatry, Yale University, New Haven, CT, 06520, USA. .,Departments of Neurobiology, Yale University, New Haven, CT, 06520, USA.
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7
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Sarmasti Emami S, Zhang D, Yang X. Interaction of the Hippo Pathway and Phosphatases in Tumorigenesis. Cancers (Basel) 2020; 12:E2438. [PMID: 32867200 PMCID: PMC7564220 DOI: 10.3390/cancers12092438] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 08/21/2020] [Accepted: 08/25/2020] [Indexed: 01/05/2023] Open
Abstract
The Hippo pathway is an emerging tumor suppressor signaling pathway involved in a wide range of cellular processes. Dysregulation of different components of the Hippo signaling pathway is associated with a number of diseases including cancer. Therefore, identification of the Hippo pathway regulators and the underlying mechanism of its regulation may be useful to uncover new therapeutics for cancer therapy. The Hippo signaling pathway includes a set of kinases that phosphorylate different proteins in order to phosphorylate and inactivate its main downstream effectors, YAP and TAZ. Thus, modulating phosphorylation and dephosphorylation of the Hippo components by kinases and phosphatases play critical roles in the regulation of the signaling pathway. While information regarding kinase regulation of the Hippo pathway is abundant, the role of phosphatases in regulating this pathway is just beginning to be understood. In this review, we summarize the most recent reports on the interaction of phosphatases and the Hippo pathway in tumorigenesis. We have also introduced challenges in clarifying the role of phosphatases in the Hippo pathway and future direction of crosstalk between phosphatases and the Hippo pathway.
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Affiliation(s)
| | | | - Xiaolong Yang
- Department of Pathology and Molecular Medicine, Queen’s University, Kingston, ON K7L 3N6, Canada; (S.S.E.); (D.Z.)
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8
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Gannam ZTK, Min K, Shillingford SR, Zhang L, Herrington J, Abriola L, Gareiss PC, Pantouris G, Tzouvelekis A, Kaminski N, Zhang X, Yu J, Jamali H, Ellman JA, Lolis E, Anderson KS, Bennett AM. An allosteric site on MKP5 reveals a strategy for small-molecule inhibition. Sci Signal 2020; 13:eaba3043. [PMID: 32843541 PMCID: PMC7569488 DOI: 10.1126/scisignal.aba3043] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The mitogen-activated protein kinase (MAPK) phosphatases (MKPs) have been considered "undruggable," but their position as regulators of the MAPKs makes them promising therapeutic targets. MKP5 has been suggested as a potential target for the treatment of dystrophic muscle disease. Here, we identified an inhibitor of MKP5 using a p38α MAPK-derived, phosphopeptide-based small-molecule screen. We solved the structure of MKP5 in complex with this inhibitor, which revealed a previously undescribed allosteric binding pocket. Binding of the inhibitor to this pocket collapsed the MKP5 active site and was predicted to limit MAPK binding. Treatment with the inhibitor recapitulated the phenotype of MKP5 deficiency, resulting in activation of p38 MAPK and JNK. We demonstrated that MKP5 was required for TGF-β1 signaling in muscle and that the inhibitor blocked TGF-β1-mediated Smad2 phosphorylation. TGF-β1 pathway antagonism has been proposed for the treatment of dystrophic muscle disease. Thus, allosteric inhibition of MKP5 represents a therapeutic strategy against dystrophic muscle disease.
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Affiliation(s)
- Zira T K Gannam
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Kisuk Min
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Shanelle R Shillingford
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
- Department of Chemistry, Yale University, New Haven, CT 06511, USA
| | - Lei Zhang
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - James Herrington
- Yale Center for Molecular Discovery, Yale West Campus, West Haven, CT 06516, USA
| | - Laura Abriola
- Yale Center for Molecular Discovery, Yale West Campus, West Haven, CT 06516, USA
| | - Peter C Gareiss
- Yale Center for Molecular Discovery, Yale West Campus, West Haven, CT 06516, USA
| | - Georgios Pantouris
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | | | - Naftali Kaminski
- Section of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Xinbo Zhang
- Department of Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA 19140, USA
| | - Jun Yu
- Center for Metabolic Disease Research and Department of Physiology, Temple University Lewis Katz School of Medicine, Philadelphia, PA 19140, USA
| | - Haya Jamali
- Department of Chemistry, Yale University, New Haven, CT 06511, USA
| | | | - Elias Lolis
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA.
| | - Karen S Anderson
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA.
- Department of Molecular Biophysics and Biochemistry, New Haven, CT 06520, USA
| | - Anton M Bennett
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA.
- Program in Integrative Cell Signaling and Neurobiology of Metabolism, Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT 06520, USA
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9
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Hou X, Sun JP, Ge L, Liang X, Li K, Zhang Y, Fang H. Inhibition of striatal-enriched protein tyrosine phosphatase by targeting computationally revealed cryptic pockets. Eur J Med Chem 2020; 190:112131. [PMID: 32078861 PMCID: PMC7163917 DOI: 10.1016/j.ejmech.2020.112131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 01/21/2020] [Accepted: 02/06/2020] [Indexed: 11/21/2022]
Abstract
Cryptic pockets, which are not apparent in crystallographic structures, provide promising alternatives to traditional binding sites for drug development. However, identifying cryptic pockets is extremely challenging and the therapeutic potential of cryptic pockets remains unclear. Here, we reported the discovery of novel inhibitors for striatal-enriched protein tyrosine phosphatase (STEP), a potential drug target for multiple neuropsychiatric disorders, based on cryptic pocket detection. By combining the use of molecular dynamics simulations and fragment-centric topographical mapping, we identified transiently open cryptic pockets and identified 12 new STEP inhibition scaffolds through structure-based virtual screening. Site-directed mutagenesis verified the binding of ST3 with the predicted cryptic pockets. Moreover, the most potent and selective inhibitors could modulate the phosphorylation of both ERK1/2 and Pyk2 in PC12 cells.
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Affiliation(s)
- Xuben Hou
- Department of Medicinal Chemistry and Key Laboratory of Chemical Biology of Natural Products (MOE), School of Pharmaceutical Science, Shandong University, Jinan, Shandong, 250012, China; Department of Chemistry, New York University, New York, NY, 10003, United States
| | - Jin-Peng Sun
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Lin Ge
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Xiao Liang
- Department of Medicinal Chemistry and Key Laboratory of Chemical Biology of Natural Products (MOE), School of Pharmaceutical Science, Shandong University, Jinan, Shandong, 250012, China
| | - Kangshuai Li
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Yingkai Zhang
- Department of Chemistry, New York University, New York, NY, 10003, United States; NYU-ECNU Center for Computational Chemistry, New York University-Shanghai, Shanghai, 200122, China
| | - Hao Fang
- Department of Medicinal Chemistry and Key Laboratory of Chemical Biology of Natural Products (MOE), School of Pharmaceutical Science, Shandong University, Jinan, Shandong, 250012, China.
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10
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Plaman BA, Chan WC, Bishop AC. Chemical activation of divergent protein tyrosine phosphatase domains with cyanine-based biarsenicals. Sci Rep 2019; 9:16148. [PMID: 31695052 PMCID: PMC6834593 DOI: 10.1038/s41598-019-52002-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 10/11/2019] [Indexed: 12/28/2022] Open
Abstract
Strategies for the direct chemical activation of specific signaling proteins could provide powerful tools for interrogating cellular signal transduction. However, targeted protein activation is chemically challenging, and few broadly applicable activation strategies for signaling enzymes have been developed. Here we report that classical protein tyrosine phosphatase (PTP) domains from multiple subfamilies can be systematically sensitized to target-specific activation by the cyanine-based biarsenical compounds AsCy3 and AsCy5. Engineering of the activatable PTPs (actPTPs) is achieved by the introduction of three cysteine residues within a conserved loop of the PTP domain, and the positions of the sensitizing mutations are readily identifiable from primary sequence alignments. In the current study we have generated and characterized actPTP domains from three different subfamilies of both receptor and non-receptor PTPs. Biarsenical-induced stimulation of the actPTPs is rapid and dose-dependent, and is operative with both purified enzymes and complex proteomic mixtures. Our results suggest that a substantial fraction of the classical PTP family will be compatible with the act-engineering approach, which provides a novel chemical-biological tool for the control of PTP activity and the study of PTP function.
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Affiliation(s)
- Bailey A Plaman
- Amherst College, Department of Chemistry, Amherst, Massachusetts, 01002, USA
| | - Wai Cheung Chan
- Amherst College, Department of Chemistry, Amherst, Massachusetts, 01002, USA.,Dana-Farber Cancer Institute, Department of Cancer Biology, Boston, MA, 02215, USA
| | - Anthony C Bishop
- Amherst College, Department of Chemistry, Amherst, Massachusetts, 01002, USA.
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11
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Mallozzi C, Pepponi R, Visentin S, Chiodi V, Lombroso PJ, Bader M, Popoli P, Domenici MR. The activity of the Striatal-enriched protein tyrosine phosphatase in neuronal cells is modulated by adenosine A 2A receptor. J Neurochem 2019; 152:284-298. [PMID: 31520531 DOI: 10.1111/jnc.14866] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/30/2019] [Accepted: 09/01/2019] [Indexed: 12/15/2022]
Abstract
We recently demonstrated that a tonic activation of adenosine A2A receptors (A2A Rs) is required for cocaine-induced synaptic depression and increase in the activity of STriatal-Enriched protein tyrosine Phosphatase (STEP). In this study, we elaborated on the relationship between A2A R and STEP using genetic, pharmacological, and cellular tools. We found that the activities of protein tyrosine phosphatases (PTPs), and in particular of STEP, are significantly increased in the striatum and hippocampus of a transgenic rat strain over-expressing the neuronal A2A R (NSEA2A ) with respect to wild-type (WT) rats. Moreover the selective A2A R agonist 4-[2-[[6-Amino-9-(N-ethyl-β-d-ribofuranuronamidosyl)-9H-purin-2-yl]amino]ethyl]benzenepropanoic acid hydrochloride up-regulates PTPs and STEP activities in WT but not in NSEA2A rats, while the selective A2A R antagonist 4-(-2-[7-amino-2-{2-furyl}{1,2,4}triazolo{2,3-a} {1,3,5}triazin-5-yl-amino]ethyl)phenol restores the tyrosine phosphatase activities in NSEA2A , having no effects in WT rats. In addition, while cocaine induced the activation of PTP and STEP in WT rats, it failed to increase phosphatase activity in NSEA2A rats. A2A Rs modulate STEP activity also in the SH-SY5Y neuroblastoma cell line, where a calcium-dependent calcineurin/PP1 pathway was found to play a major role. In summary, the present study identified a novel interaction between A2A R and STEP that could have important clinical implications, since STEP has emerged as key regulator of signaling pathways involved in neurodegenerative and neuropsychiatric diseases and A2A Rs are considered a promising target for the development of therapeutic strategies for different diseases of the central nervous system. Read the Editorial Highlight for this article on page 270.
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Affiliation(s)
- Cinzia Mallozzi
- Department of Neuroscience, Istituto Superiore di Sanità, Rome, Italy
| | - Rita Pepponi
- National Centre for Drug Research and Evaluation, Istituto Superiore di Sanità, Rome, Italy
| | - Sergio Visentin
- National Centre for Drug Research and Evaluation, Istituto Superiore di Sanità, Rome, Italy
| | - Valentina Chiodi
- National Centre for Drug Research and Evaluation, Istituto Superiore di Sanità, Rome, Italy
| | - Paul J Lombroso
- Child Study Center, Yale School of Medicine, New Haven, CT, USA
| | - Michael Bader
- Max-Delbrűck-Center for Molecular Medicine, Berlin, Germany
| | - Patrizia Popoli
- National Centre for Drug Research and Evaluation, Istituto Superiore di Sanità, Rome, Italy
| | - Maria Rosaria Domenici
- National Centre for Drug Research and Evaluation, Istituto Superiore di Sanità, Rome, Italy
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12
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Li K, Hou X, Li R, Bi W, Yang F, Chen X, Xiao P, Liu T, Lu T, Zhou Y, Tian Z, Shen Y, Zhang Y, Wang J, Fang H, Sun J, Yu X. Identification and structure-function analyses of an allosteric inhibitor of the tyrosine phosphatase PTPN22. J Biol Chem 2019; 294:8653-8663. [PMID: 30979725 DOI: 10.1074/jbc.ra118.007129] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 03/23/2019] [Indexed: 01/08/2023] Open
Abstract
Protein-tyrosine phosphatase nonreceptor type 22 (PTPN22) is a lymphoid-specific tyrosine phosphatase (LYP), and mutations in the PTPN22 gene are highly correlated with a spectrum of autoimmune diseases. However, compounds and mechanisms that specifically inhibit LYP enzymes to address therapeutic needs to manage these diseases remain to be discovered. Here, we conducted a similarity search of a commercial database for PTPN22 inhibitors and identified several LYP inhibitor scaffolds, which helped identify one highly active inhibitor, NC1. Using noncompetitive inhibition curve and phosphatase assays, we determined NC1's inhibition mode toward PTPN22 and its selectivity toward a panel of phosphatases. We found that NC1 is a noncompetitive LYP inhibitor and observed that it exhibits selectivity against other protein phosphatases and effectively inhibits LYP activity in lymphoid T cells and modulates T-cell receptor signaling. Results from site-directed mutagenesis, fragment-centric topographic mapping, and molecular dynamics simulation experiments suggested that NC1, unlike other known LYP inhibitors, concurrently binds to a "WPD" pocket and a second pocket surrounded by an LYP-specific insert, which contributes to its selectivity against other phosphatases. Moreover, using a newly developed method to incorporate the unnatural amino acid 2-fluorine-tyrosine and 19F NMR spectroscopy, we provide direct evidence that NC1 allosterically regulates LYP activity by restricting WPD-loop movement. In conclusion, our approach has identified a new allosteric binding site in LYP useful for selective LYP inhibitor development; we propose that the 19F NMR probe developed here may also be useful for characterizing allosteric inhibitors of other tyrosine phosphatases.
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Affiliation(s)
- Kangshuai Li
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Xuben Hou
- Department of Medicinal Chemistry and Key Laboratory of Chemical Biology of Natural Products (MOE), School of Pharmacy, Shandong University, Jinan, Shandong 250012, China; Department of Chemistry, New York University, New York, New York 10003
| | - Ruirui Li
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Wenxiang Bi
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Fan Yang
- Department of Physiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Xu Chen
- Department of Physiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Peng Xiao
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Tiantian Liu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Tiange Lu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Yuan Zhou
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Zhaomei Tian
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Yuemao Shen
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Shandong University, Jinan, Shandong 250012, China
| | - Yingkai Zhang
- Department of Chemistry, New York University, New York, New York 10003; NYU-ECNU Center for Computational Chemistry at NYU Shanghai, Shanghai 200062, China
| | - Jiangyun Wang
- Laboratory of Quantum Biophysics and Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, 100101, China
| | - Hao Fang
- Department of Medicinal Chemistry and Key Laboratory of Chemical Biology of Natural Products (MOE), School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Jinpeng Sun
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong 250012, China.
| | - Xiao Yu
- Department of Physiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China.
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13
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Tautermann CS, Binder F, Büttner FH, Eickmeier C, Fiegen D, Gross U, Grundl MA, Heilker R, Hobson S, Hoerer S, Luippold A, Mack V, Montel F, Peters S, Bhattacharya S, Vaidehi N, Schnapp G, Thamm S, Zeeb M. Allosteric Activation of Striatal-Enriched Protein Tyrosine Phosphatase (STEP, PTPN5) by a Fragment-like Molecule. J Med Chem 2018; 62:306-316. [PMID: 30207464 DOI: 10.1021/acs.jmedchem.8b00857] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Protein tyrosine phosphatase non-receptor type 5 (PTPN5, STEP) is a brain specific phosphatase that regulates synaptic function and plasticity by modulation of N-methyl-d-aspartate receptor (NMDAR) and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) trafficking. Dysregulation of STEP has been linked to neurodegenerative and neuropsychiatric diseases, highlighting this enzyme as an attractive therapeutic target for drug discovery. Selective targeting of STEP with small molecules has been hampered by high conservation of the active site among protein tyrosine phosphatases. We report the discovery of the first small molecule allosteric activator for STEP that binds to the phosphatase domain. Allosteric binding is confirmed by both X-ray and 15N NMR experiments, and specificity has been demonstrated by an enzymatic test cascade. Molecular dynamics simulations indicate stimulation of enzymatic activity by a long-range allosteric mechanism. To allow the scientific community to make use of this tool, we offer to provide the compound in the course of an open innovation initiative.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Supriyo Bhattacharya
- Department of Molecular Immunology , Beckman Research Institute of the City of Hope , 1500, E. Duarte Road , Duarte , California 91010 , United States
| | - Nagarajan Vaidehi
- Department of Molecular Immunology , Beckman Research Institute of the City of Hope , 1500, E. Duarte Road , Duarte , California 91010 , United States
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14
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Activation of Phosphotyrosine-Mediated Signaling Pathways in the Cortex and Spinal Cord of SOD1 G93A, a Mouse Model of Familial Amyotrophic Lateral Sclerosis. Neural Plast 2018; 2018:2430193. [PMID: 30154836 PMCID: PMC6098854 DOI: 10.1155/2018/2430193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 06/06/2018] [Accepted: 07/05/2018] [Indexed: 12/12/2022] Open
Abstract
Degeneration of cortical and spinal motor neurons is the typical feature of amyotrophic lateral sclerosis (ALS), a progressive neurodegenerative disease for which a pathogenetic role for the Cu/Zn superoxide dismutase (SOD1) has been demonstrated. Mice overexpressing a mutated form of the SOD1 gene (SOD1G93A) develop a syndrome that closely resembles the human disease. The SOD1 mutations confer to this enzyme a “gain-of-function,” leading to increased production of reactive oxygen species. Several oxidants induce tyrosine phosphorylation through direct stimulation of kinases and/or phosphatases. In this study, we analyzed the activities of src and fyn tyrosine kinases and of protein tyrosine phosphatases in synaptosomal fractions prepared from the motor cortex and spinal cord of transgenic mice expressing SOD1G93A. We found that (i) protein phosphotyrosine level is increased, (ii) src and fyn activities are upregulated, and (iii) the activity of tyrosine phosphatases, including the striatal-enriched tyrosine phosphatase (STEP), is significantly decreased. Moreover, the NMDA receptor (NMDAR) subunit GluN2B tyrosine phosphorylation was upregulated in SOD1G93A. Tyrosine phosphorylation of GluN2B subunits regulates the NMDAR function and the recruitment of downstream signaling molecules. Indeed, we found that proline-rich tyrosine kinase 2 (Pyk2) and ERK1/2 kinase are upregulated in SOD1G93A mice. These results point out an involvement of tyrosine kinases and phosphatases in the pathogenesis of ALS.
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15
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Yang F, Xiao P, Qu CX, Liu Q, Wang LY, Liu ZX, He QT, Liu C, Xu JY, Li RR, Li MJ, Li Q, Guo XZ, Yang ZY, He DF, Yi F, Ruan K, Shen YM, Yu X, Sun JP, Wang J. Allosteric mechanisms underlie GPCR signaling to SH3-domain proteins through arrestin. Nat Chem Biol 2018; 14:876-886. [PMID: 30120361 DOI: 10.1038/s41589-018-0115-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 07/03/2018] [Indexed: 12/30/2022]
Abstract
Signals from 800 G-protein-coupled receptors (GPCRs) to many SH3 domain-containing proteins (SH3-CPs) regulate important physiological functions. These GPCRs may share a common pathway by signaling to SH3-CPs via agonist-dependent arrestin recruitment rather than through direct interactions. In the present study, 19F-NMR and cellular studies revealed that downstream of GPCR activation engagement of the receptor-phospho-tail with arrestin allosterically regulates the specific conformational states and functional outcomes of remote β-arrestin 1 proline regions (PRs). The observed NMR chemical shifts of arrestin PRs were consistent with the intrinsic efficacy and specificity of SH3 domain recruitment, which was controlled by defined propagation pathways. Moreover, in vitro reconstitution experiments and biophysical results showed that the receptor-arrestin complex promoted SRC kinase activity through an allosteric mechanism. Thus, allosteric regulation of the conformational states of β-arrestin 1 PRs by GPCRs and the allosteric activation of downstream effectors by arrestin are two important mechanisms underlying GPCR-to-SH3-CP signaling.
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Affiliation(s)
- Fan Yang
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China.,Institute of Biophysics, Chinese Academy of Sciences, Beijing, Chaoyang district, Beijing, China.,Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology, Shandong University School of Medicine, Shandong, China.,Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
| | - Peng Xiao
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China.,Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Science, Shandong University, Jinan, Shandong, China
| | - Chang-Xiu Qu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Qi Liu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China.,Institute of Biophysics, Chinese Academy of Sciences, Beijing, Chaoyang district, Beijing, China.,Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology, Shandong University School of Medicine, Shandong, China
| | - Liu-Yang Wang
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC, USA
| | - Zhi-Xin Liu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Qing-Tao He
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China.,Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
| | - Chuan Liu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
| | - Jian-Ye Xu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Rui-Rui Li
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Meng-Jing Li
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Qing Li
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology, Shandong University School of Medicine, Shandong, China
| | - Xu-Zhen Guo
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, Chaoyang district, Beijing, China
| | - Zhao-Ya Yang
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China.,Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China
| | - Dong-Fang He
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Fan Yi
- Department of Pharmacology, Shandong University School of Medicine, Jinan, China
| | - Ke Ruan
- Laboratory for Physical Sciences at the Microscale and School of Life Sciences, University of Science and Technology of China, Hefei Anhui, China
| | - Yue-Mao Shen
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC, USA
| | - Xiao Yu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Physiology, Shandong University School of Medicine, Shandong, China
| | - Jin-Peng Sun
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong, China. .,Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, China.
| | - Jiangyun Wang
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, Chaoyang district, Beijing, China.
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16
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Courtney AH, Amacher JF, Kadlecek TA, Mollenauer MN, Au-Yeung BB, Kuriyan J, Weiss A. A Phosphosite within the SH2 Domain of Lck Regulates Its Activation by CD45. Mol Cell 2017; 67:498-511.e6. [PMID: 28735895 DOI: 10.1016/j.molcel.2017.06.024] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 03/24/2017] [Accepted: 06/20/2017] [Indexed: 10/19/2022]
Abstract
The Src Family kinase Lck sets a critical threshold for T cell activation because it phosphorylates the TCR complex and the Zap70 kinase. How a T cell controls the abundance of active Lck molecules remains poorly understood. We have identified an unappreciated role for a phosphosite, Y192, within the Lck SH2 domain that profoundly affects the amount of active Lck in cells. Notably, mutation of Y192 blocks critical TCR-proximal signaling events and impairs thymocyte development in retrogenic mice. We determined that these defects are caused by hyperphosphorylation of the inhibitory C-terminal tail of Lck. Our findings reveal that modification of Y192 inhibits the ability of CD45 to associate with Lck in cells and dephosphorylate the C-terminal tail of Lck, which prevents its adoption of an active open conformation. These results suggest a negative feedback loop that responds to signaling events that tune active Lck amounts and TCR sensitivity.
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Affiliation(s)
- Adam H Courtney
- Division of Rheumatology, Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Jeanine F Amacher
- Departments of Molecular and Cell Biology and Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Theresa A Kadlecek
- The Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 04143, USA
| | - Marianne N Mollenauer
- The Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 04143, USA
| | - Byron B Au-Yeung
- Division of Rheumatology, Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
| | - John Kuriyan
- Departments of Molecular and Cell Biology and Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA; The Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Arthur Weiss
- Division of Rheumatology, Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA; The Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 04143, USA.
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17
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Dolichol phosphate mannose synthase: a Glycosyltransferase with Unity in molecular diversities. Glycoconj J 2017; 34:467-479. [PMID: 28616799 DOI: 10.1007/s10719-017-9777-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 04/20/2017] [Accepted: 05/18/2017] [Indexed: 10/19/2022]
Abstract
N-glycans provide structural and functional stability to asparagine-linked (N-linked) glycoproteins, and add flexibility. Glycan biosynthesis is elaborative, multi-compartmental and involves many glycosyltransferases. Failure to assemble N-glycans leads to phenotypic changes developing infection, cancer, congenital disorders of glycosylation (CDGs) among others. Biosynthesis of N-glycans begins at the endoplasmic reticulum (ER) with the assembly of dolichol-linked tetra-decasaccharide (Glc3Man9GlcNAc2-PP-Dol) where dolichol phosphate mannose synthase (DPMS) plays a central role. DPMS is also essential for GPI anchor biosynthesis as well as for O- and C-mannosylation of proteins in yeast and in mammalian cells. DPMS has been purified from several sources and its gene has been cloned from 39 species (e.g., from protozoan parasite to human). It is an inverting GT-A folded enzyme and classified as GT2 by CAZy (carbohydrate active enZyme; http://www.cazy.org ). The sequence alignment detects the presence of a metal binding DAD signature in DPMS from all 39 species but finds cAMP-dependent protein phosphorylation motif (PKA motif) in only 38 species. DPMS also has hydrophobic region(s). Hydropathy analysis of amino acid sequences from bovine, human, S. crevisiae and A. thaliana DPMS show PKA motif is present between the hydrophobic domains. The location of PKA motif as well as the hydrophobic domain(s) in the DPMS sequence vary from species to species. For example, the domain(s) could be located at the center or more towards the C-terminus. Irrespective of their catalytic similarity, the DNA sequence, the amino acid identity, and the lack of a stretch of hydrophobic amino acid residues at the C-terminus, DPMS is still classified as Type I and Type II enzyme. Because of an apparent bio-sensing ability, extracellular signaling and microenvironment regulate DPMS catalytic activity. In this review, we highlight some important features and the molecular diversities of DPMS.
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18
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Lombroso PJ, Ogren M, Kurup P, Nairn AC. Molecular underpinnings of neurodegenerative disorders: striatal-enriched protein tyrosine phosphatase signaling and synaptic plasticity. F1000Res 2016; 5. [PMID: 29098072 PMCID: PMC5642311 DOI: 10.12688/f1000research.8571.1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/20/2016] [Indexed: 12/22/2022] Open
Abstract
This commentary focuses on potential molecular mechanisms related to the dysfunctional synaptic plasticity that is associated with neurodegenerative disorders such as Alzheimer's disease and Parkinson's disease. Specifically, we focus on the role of striatal-enriched protein tyrosine phosphatase (STEP) in modulating synaptic function in these illnesses. STEP affects neuronal communication by opposing synaptic strengthening and does so by dephosphorylating several key substrates known to control synaptic signaling and plasticity. STEP levels are elevated in brains from patients with Alzheimer's and Parkinson's disease. Studies in model systems have found that high levels of STEP result in internalization of glutamate receptors as well as inactivation of ERK1/2, Fyn, Pyk2, and other STEP substrates necessary for the development of synaptic strengthening. We discuss the search for inhibitors of STEP activity that may offer potential treatments for neurocognitive disorders that are characterized by increased STEP activity. Future studies are needed to examine the mechanisms of differential and region-specific changes in STEP expression pattern, as such knowledge could lead to targeted therapies for disorders involving disrupted STEP activity.
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Affiliation(s)
- Paul J Lombroso
- Child Study Center, Yale University School of Medicine, New Haven, Connecticut, 06520, USA.,Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut, 06520, USA.,Department of Neuroscience, Yale University School of Medicine, New Haven, Connecticut, 06520, USA
| | - Marilee Ogren
- Department of Psychology, Boston College, Chestnut Hill, MA, 02467, USA
| | - Pradeep Kurup
- Child Study Center, Yale University School of Medicine, New Haven, Connecticut, 06520, USA
| | - Angus C Nairn
- Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut, 06520, USA
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19
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Ku B, You JA, Lee HS, Shin HC, Park H, Kim SJ. Discovery of Novel Striatal-enriched Protein Tyrosine Phosphatase Inhibitors Through Structure-based Virtual Screening. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.10974] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Bonsu Ku
- Disease Target Structure Research Center; Korea Research Institute of Bioscience and Biotechnology; Daejeon 34141 Republic of Korea
- Department of Bio-Analytical Science; University of Science and Technology; Daejeon 34113 Republic of Korea
| | - Jin A You
- Disease Target Structure Research Center; Korea Research Institute of Bioscience and Biotechnology; Daejeon 34141 Republic of Korea
- Department of Bio-Analytical Science; University of Science and Technology; Daejeon 34113 Republic of Korea
| | - Hye Seon Lee
- Disease Target Structure Research Center; Korea Research Institute of Bioscience and Biotechnology; Daejeon 34141 Republic of Korea
- Department of Biology; Chungnam National University; Daejeon 34134 Republic of Korea
| | - Ho-Chul Shin
- Disease Target Structure Research Center; Korea Research Institute of Bioscience and Biotechnology; Daejeon 34141 Republic of Korea
| | - Hwangseo Park
- Department of Bioscience and Biotechnology; Sejong University; Seoul 05006 Republic of Korea
| | - Seung Jun Kim
- Disease Target Structure Research Center; Korea Research Institute of Bioscience and Biotechnology; Daejeon 34141 Republic of Korea
- Department of Bio-Analytical Science; University of Science and Technology; Daejeon 34113 Republic of Korea
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20
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Ge L, Li KS, Li MM, Xiao P, Hou XB, Chen X, Liu HD, Lin A, Yu X, Ren GJ, Fang H, Sun JP. Identification of a benzo imidazole thiazole derivative as the specific irreversible inhibitor of protein tyrosine phosphatase. Bioorg Med Chem Lett 2016; 26:4795-4798. [DOI: 10.1016/j.bmcl.2016.08.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/06/2016] [Accepted: 08/10/2016] [Indexed: 10/21/2022]
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21
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Li H, Yang F, Liu C, Xiao P, Xu Y, Liang Z, Liu C, Wang H, Wang W, Zheng W, Zhang W, Ma X, He D, Song X, Cui F, Xu Z, Yi F, Sun JP, Yu X. Crystal Structure and Substrate Specificity of PTPN12. Cell Rep 2016; 15:1345-58. [DOI: 10.1016/j.celrep.2016.04.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 01/27/2016] [Accepted: 03/29/2016] [Indexed: 01/21/2023] Open
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22
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Role of Striatal-Enriched Tyrosine Phosphatase in Neuronal Function. Neural Plast 2016; 2016:8136925. [PMID: 27190655 PMCID: PMC4844879 DOI: 10.1155/2016/8136925] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 03/27/2016] [Indexed: 11/18/2022] Open
Abstract
Striatal-enriched protein tyrosine phosphatase (STEP) is a CNS-enriched protein implicated in multiple neurologic and neuropsychiatric disorders. STEP regulates key signaling proteins required for synaptic strengthening as well as NMDA and AMPA receptor trafficking. Both high and low levels of STEP disrupt synaptic function and contribute to learning and behavioral deficits. High levels of STEP are present in human postmortem samples and animal models of Alzheimer's disease, Parkinson's disease, and schizophrenia and in animal models of fragile X syndrome. Low levels of STEP activity are present in additional disorders that include ischemia, Huntington's chorea, alcohol abuse, and stress disorders. Thus the current model of STEP is that optimal levels are required for optimal synaptic function. Here we focus on the role of STEP in Alzheimer's disease and the mechanisms by which STEP activity is increased in this illness. Both genetic lowering of STEP levels and pharmacological inhibition of STEP activity in mouse models of Alzheimer's disease reverse the biochemical and cognitive abnormalities that are present. These findings suggest that STEP is an important point for modulation of proteins required for synaptic plasticity.
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23
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Li KS, Xiao P, Zhang DL, Hou XB, Ge L, Yang DX, Liu HD, He DF, Chen X, Han KR, Song XY, Yu X, Fang H, Sun JP. Identification of para-Substituted Benzoic Acid Derivatives as Potent Inhibitors of the Protein Phosphatase Slingshot. ChemMedChem 2015; 10:1980-7. [PMID: 26553423 DOI: 10.1002/cmdc.201500454] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Indexed: 12/31/2022]
Abstract
Slingshot proteins form a small group of dual-specific phosphatases that modulate cytoskeleton dynamics through dephosphorylation of cofilin and Lim kinases (LIMK). Small chemical compounds with Slingshot-inhibiting activities have therapeutic potential against cancers or infectious diseases. However, only a few Slingshot inhibitors have been investigated and reported, and their cellular activities have not been examined. In this study, we identified two rhodanine-scaffold-based para-substituted benzoic acid derivatives as competitive Slingshot inhibitors. The top compound, (Z)-4-((4-((4-oxo-2-thioxo-3-(o-tolyl)thiazolidin-5-ylidene)methyl)phenoxy)methyl)benzoic acid (D3) had an inhibition constant (Ki) of around 4 μm and displayed selectivity over a panel of other phosphatases. Moreover, compound D3 inhibited cell migration and cofilin dephosphorylation after nerve growth factor (NGF) or angiotensin II stimulation. Therefore, our newly identified Slingshot inhibitors provide a starting point for developing Slingshot-targeted therapies.
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Affiliation(s)
- Kang-shuai Li
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China.,Department of Physiology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Peng Xiao
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China.,Department of Medicinal Chemistry, Key Laboratory of Chemical Biology of Natural Products (MOE), School of Pharmacy, Shandong University, Jinan, Shandong, 250012, China
| | - Dao-lai Zhang
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China.,School of Pharmacy, Binzhou Medical University, Yantai, 264003, China
| | - Xu-Ben Hou
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology of Natural Products (MOE), School of Pharmacy, Shandong University, Jinan, Shandong, 250012, China
| | - Lin Ge
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Du-xiao Yang
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Hong-da Liu
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Dong-fang He
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Xu Chen
- Department of Physiology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Ke-rui Han
- Mailman School of Public Health, Columbia University, New York, NY, 10032, USA
| | - Xiao-yuan Song
- Key Laboratory of Brain Function and Disease, Chinese Academy of Sciences (CAS) and, School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China
| | - Xiao Yu
- Department of Physiology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Hao Fang
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Jin-peng Sun
- Key Laboratory Experimental Teratology of the Ministry of Education (MOE) and, Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, Shandong, 250012, China.
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24
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Corrigendum. J Neurochem 2015; 134:978. [DOI: 10.1111/jnc.13211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Tassin TC, Benavides DR, Plattner F, Nishi A, Bibb JA. Regulation of ERK Kinase by MEK1 Kinase Inhibition in the Brain. J Biol Chem 2015; 290:16319-29. [PMID: 25971971 DOI: 10.1074/jbc.m115.654897] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Indexed: 11/06/2022] Open
Abstract
Metabotropic (slow) and ionotropic (fast) neurotransmission are integrated by intracellular signal transduction mechanisms involving protein phosphorylation/dephosphorylation to achieve experience-dependent alterations in brain circuitry. ERK is an important effector of both slow and fast forms of neurotransmission and has been implicated in normal brain function and CNS diseases. Here we characterize phosphorylation of the ERK-activating protein kinase MEK1 by Cdk5, ERK, and Cdk1 in vitro in intact mouse brain tissue and in the context of an animal behavioral paradigm of stress. Cdk5 only phosphorylates Thr-292, whereas ERK and Cdk1 phosphorylate both Thr-292 and Thr-286 MEK1. These sites interact in a kinase-specific manner and inhibit the ability of MEK1 to activate ERK. Thr-292 and Thr-286 MEK1 are phosphorylated in most mouse brain regions to stoichiometries of ~5% or less. Phosphorylation of Thr-292 MEK1 is regulated by cAMP-dependent signaling in mouse striatum in a manner consistent with negative feedback inhibition in response to ERK activation. Protein phosphatase 1 and 2A contribute to the maintenance of the basal phosphorylation state of both Thr-292 and Thr-286 MEK1 and that of ERK. Activation of the NMDA class of ionotropic glutamate receptors reduces inhibitory MEK1 phosphorylation, whereas forced swim, a paradigm of acute stress, attenuates Thr-292 MEK1 phosphorylation. Together, the data indicate that these inhibitory MEK1 sites phosphorylated by Cdk5 and ERK1 serve as mechanistic points of convergence for the regulation of ERK signaling by both slow and fast neurotransmission.
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Affiliation(s)
| | - David R Benavides
- the Department of Neurology, The Johns Hopkins Hospital, Baltimore, Maryland 21287, and
| | | | - Akinori Nishi
- the Department of Pharmacology, Kurume University School of Medicine, Kurume, Fukuoka 830-0011, Japan
| | - James A Bibb
- From the Departments of Psychiatry and Neurology and Neurotherapeutics and Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390,
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26
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Erkens M, Tanaka-Yamamoto K, Cheron G, Márquez-Ruiz J, Prigogine C, Schepens JT, Nadif Kasri N, Augustine GJ, Hendriks WJ. Protein tyrosine phosphatase receptor type R is required for Purkinje cell responsiveness in cerebellar long-term depression. Mol Brain 2015; 8:1. [PMID: 25571783 PMCID: PMC4304614 DOI: 10.1186/s13041-014-0092-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 12/19/2014] [Indexed: 01/24/2023] Open
Abstract
Background Regulation of synaptic connectivity, including long-term depression (LTD), allows proper tuning of cellular signalling processes within brain circuitry. In the cerebellum, a key centre for motor coordination, a positive feedback loop that includes mitogen-activated protein kinases (MAPKs) is required for proper temporal control of LTD at cerebellar Purkinje cell synapses. Here we report that the tyrosine-specific MAPK-phosphatase PTPRR plays a role in coordinating the activity of this regulatory loop. Results LTD in the cerebellum of Ptprr−/− mice is strongly impeded, in vitro and in vivo. Comparison of basal phospho-MAPK levels between wild-type and PTPRR deficient cerebellar slices revealed increased levels in mutants. This high basal phospho-MAPK level attenuated further increases in phospho-MAPK during chemical induction of LTD, essentially disrupting the positive feedback loop and preventing α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) phosphorylation and endocytosis. Conclusions Our findings indicate an important role for PTPRR in maintaining low basal MAPK activity in Purkinje cells. This creates an optimal ‘window’ to boost MAPK activity following signals that induce LTD, which can then propagate through feed-forward signals to cause AMPAR internalization and LTD.
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Affiliation(s)
- Mirthe Erkens
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO Box 9101, Nijmegen, 6500, HB, The Netherlands.
| | - Keiko Tanaka-Yamamoto
- Center for Functional Connectomics, Korea Institute of Science and Technology, 39-1 Hawolgokdong, Seongbukgu, Seoul, 136-791, Republic of Korea.
| | - Guy Cheron
- Laboratory of Electrophysiology, Université de Mons, Mons, 7000, Belgium. .,Laboratory of Neurophysiology and Movement Biomechanics, CP601, ULB Neurosciences Institut, Université Libre de Bruxelles, Brussels, 1070, Belgium.
| | - Javier Márquez-Ruiz
- División de Neurociencias, Universidad Pablo de Olavide, Sevilla, 41013, Spain. .,Department of Cognitive Neurosciences, Nijmegen, 6500, HB, The Netherlands.
| | - Cynthia Prigogine
- Laboratory of Electrophysiology, Université de Mons, Mons, 7000, Belgium. .,Laboratory of Neurophysiology and Movement Biomechanics, CP601, ULB Neurosciences Institut, Université Libre de Bruxelles, Brussels, 1070, Belgium.
| | - Jan Tg Schepens
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO Box 9101, Nijmegen, 6500, HB, The Netherlands.
| | - Nael Nadif Kasri
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, PO Box 9101, Nijmegen, HB, 6500, The Netherlands.
| | - George J Augustine
- Center for Functional Connectomics, Korea Institute of Science and Technology, 39-1 Hawolgokdong, Seongbukgu, Seoul, 136-791, Republic of Korea. .,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore. .,Institute of Molecular and Cell Biology, 61 Biopolis Drive, Proteos, Singapore, 138673, Singapore.
| | - Wiljan Jaj Hendriks
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO Box 9101, Nijmegen, 6500, HB, The Netherlands.
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Xiao P, Wang X, Wang HM, Fu XL, Cui FA, Yu X, Wen SS, Bi WX, Sun JP. The second-sphere residue T263 is important for the function and catalytic activity of PTP1B via interaction with the WPD-loop. Int J Biochem Cell Biol 2014; 57:84-95. [PMID: 25450460 DOI: 10.1016/j.biocel.2014.10.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 09/21/2014] [Accepted: 10/04/2014] [Indexed: 10/24/2022]
Abstract
Protein tyrosine phosphatases have diverse substrate specificities and intrinsic activities that lay the foundations for the fine-tuning of a phosphorylation network to precisely regulate cellular signal transduction. All classical PTPs share common catalytic mechanisms, and the important catalytic residues in the first sphere of their active sites have been well characterized. However, little attention has been paid to the second-sphere residues that are potentially important in defining the intrinsic activity and substrate specificity of PTPs. Here, we find that a conserved second-sphere residue, Thr263, located in the surface Q-loop is important for both the function and activity of PTPs. Using PTP1B as a study model, we found that mutations of Thr263 impaired the negative regulation role of PTP1B in insulin signaling. A detailed mechanistic study utilizing steady-state kinetics, Brønsted analysis and pH dependence in the presence of pNPP or phosphopeptide substrates revealed that Thr263 is required for the stabilization of the leaving group during catalysis. Further crystallographic studies and structural comparison revealed that Thr263 regulates the general acid function through modulation of the WPD-loop by the T263:F182/Y/H interaction pair, which is conserved in 26 out of 32 classical PTPs. In addition, the hydrophobic interaction between Thr263 and Arg1159 of the insulin receptor contributes to the substrate specificity of PTP1B. Taken together, our findings demonstrate the general role of the second-sphere residue Thr263 in PTP catalysis. Our findings suggest that the second sphere residues of PTP active site may play important roles in PTP-mediated function in both normal and diseased states.
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Affiliation(s)
- Peng Xiao
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University, School of Medicine, Jinan, Shandong, China; Shandong Provincial School Key Laboratory for Protein Science of Chronic Degenerative Diseases, Jinan, Shandong, China
| | - Xiao Wang
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University, School of Medicine, Jinan, Shandong, China; Shandong Provincial School Key Laboratory for Protein Science of Chronic Degenerative Diseases, Jinan, Shandong, China
| | - Hong-Mei Wang
- Shandong Provincial School Key Laboratory for Protein Science of Chronic Degenerative Diseases, Jinan, Shandong, China; Department of Physiology, Shandong University, School of Medicine, Jinan, Shandong, China
| | - Xiao-Lei Fu
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University, School of Medicine, Jinan, Shandong, China; Shandong Provincial School Key Laboratory for Protein Science of Chronic Degenerative Diseases, Jinan, Shandong, China; Department of Public Health, Shandong University, School of Medicine, Jinan, Shandong, China
| | - Fu-ai Cui
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University, School of Medicine, Jinan, Shandong, China
| | - Xiao Yu
- Shandong Provincial School Key Laboratory for Protein Science of Chronic Degenerative Diseases, Jinan, Shandong, China; Department of Public Health, Shandong University, School of Medicine, Jinan, Shandong, China
| | - Shi-shuai Wen
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University, School of Medicine, Jinan, Shandong, China; Shandong Provincial School Key Laboratory for Protein Science of Chronic Degenerative Diseases, Jinan, Shandong, China
| | - Wen-Xiang Bi
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University, School of Medicine, Jinan, Shandong, China.
| | - Jin-Peng Sun
- Key Laboratory Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University, School of Medicine, Jinan, Shandong, China; Shandong Provincial School Key Laboratory for Protein Science of Chronic Degenerative Diseases, Jinan, Shandong, China; Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China.
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28
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Wang HM, Xu YF, Ning SL, Yang DX, Li Y, Du YJ, Yang F, Zhang Y, Liang N, Yao W, Zhang LL, Gu LC, Gao CJ, Pang Q, Chen YX, Xiao KH, Ma R, Yu X, Sun JP. The catalytic region and PEST domain of PTPN18 distinctly regulate the HER2 phosphorylation and ubiquitination barcodes. Cell Res 2014; 24:1067-90. [PMID: 25081058 PMCID: PMC4152746 DOI: 10.1038/cr.2014.99] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2014] [Revised: 04/27/2014] [Accepted: 05/26/2014] [Indexed: 12/23/2022] Open
Abstract
The tyrosine phosphorylation barcode encoded in C-terminus of HER2 and its ubiquitination regulate diverse HER2 functions. PTPN18 was reported as a HER2 phosphatase; however, the exact mechanism by which it defines HER2 signaling is not fully understood. Here, we demonstrate that PTPN18 regulates HER2-mediated cellular functions through defining both its phosphorylation and ubiquitination barcodes. Enzymologic characterization and three crystal structures of PTPN18 in complex with HER2 phospho-peptides revealed the molecular basis for the recognition between PTPN18 and specific HER2 phosphorylation sites, which assumes two distinct conformations. Unique structural properties of PTPN18 contribute to the regulation of sub-cellular phosphorylation networks downstream of HER2, which are required for inhibition of HER2-mediated cell growth and migration. Whereas the catalytic domain of PTPN18 blocks lysosomal routing and delays the degradation of HER2 by dephosphorylation of HER2 on pY(1112), the PEST domain of PTPN18 promotes K48-linked HER2 ubiquitination and its rapid destruction via the proteasome pathway and an HER2 negative feedback loop. In agreement with the negative regulatory role of PTPN18 in HER2 signaling, the HER2/PTPN18 ratio was correlated with breast cancer stage. Taken together, our study presents a structural basis for selective HER2 dephosphorylation, a previously uncharacterized mechanism for HER2 degradation and a novel function for the PTPN18 PEST domain. The new regulatory role of the PEST domain in the ubiquitination pathway will broaden our understanding of the functions of other important PEST domain-containing phosphatases, such as LYP and PTPN12.
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Affiliation(s)
- Hong-Mei Wang
- 1] Key Laboratory for Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong 250012, China [2] Department of Physiology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Yun-Fei Xu
- 1] Key Laboratory for Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong 250012, China [2] Department of Physiology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Shang-Lei Ning
- Qilu Hospital, Shandong University, Jinan, Shandong 250012, China
| | - Du-Xiao Yang
- Key Laboratory for Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Yi Li
- Shandong Provincial Hospital, Shandong University, Jinan, Shandong 250021, China
| | - Yu-Jie Du
- Department of Physiology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Fan Yang
- Department of Physiology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Ya Zhang
- Department of Physiology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Nan Liang
- 1] Key Laboratory for Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong 250012, China [2] Shandong Provincial Hospital, Shandong University, Jinan, Shandong 250021, China
| | - Wei Yao
- Department of Physiology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Ling-Li Zhang
- Key Laboratory for Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Li-Chuan Gu
- Shandong University, School of Life Science, Jinan, Shandong 250012, China
| | - Cheng-Jiang Gao
- Key Laboratory for Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Qi Pang
- Shandong Provincial Hospital, Shandong University, Jinan, Shandong 250021, China
| | - Yu-Xin Chen
- Qilu Hospital, Shandong University, Jinan, Shandong 250012, China
| | - Kun-Hong Xiao
- Duke University, School of Medicine, Durham, 27705, USA
| | - Rong Ma
- Qilu Hospital, Shandong University, Jinan, Shandong 250012, China
| | - Xiao Yu
- 1] Key Laboratory for Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong 250012, China [2] Department of Physiology, Shandong University School of Medicine, Jinan, Shandong 250012, China [3] Qilu Hospital, Shandong University, Jinan, Shandong 250012, China
| | - Jin-Peng Sun
- 1] Key Laboratory for Experimental Teratology of the Ministry of Education and Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Jinan, Shandong 250012, China [2] Shandong Provincial Hospital, Shandong University, Jinan, Shandong 250021, China
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