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Antoine M, Vandenbroere I, Ghosh S, Erneux C, Pirson I. IRSp53 is a novel interactor of SHIP2: A role of the actin binding protein Mena in their cellular localization in breast cancer cells. Cell Signal 2020; 73:109692. [PMID: 32535200 DOI: 10.1016/j.cellsig.2020.109692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 06/08/2020] [Accepted: 06/09/2020] [Indexed: 10/24/2022]
Abstract
A tight control of the machineries regulating membrane bending and actin dynamics is very important for the generation of membrane protrusions, which are crucial for cell migration and invasion. Protein/protein and protein/phosphoinositides complexes assemble and disassemble to coordinate these mechanisms, the scaffold properties of the involved proteins playing a prominent role in this organization. The PI 5-phosphatase SHIP2 is a critical enzyme modulating PI(3,4,5)P3, PI(4,5)P2 and PI(3,4)P2 content in the cell. The scaffold properties of SHIP2 contribute to the specific targeting or retention of the protein in particular subcellular domains. Here, we identified IRSp53 as a new binding interactor of SHIP2 proline-rich domain. Both proteins are costained in HEK293T cells protrusions, upon transfection. We showed that the SH3-binding polyproline motif recognized by IRSp53 in SHIP2 is different from the regions targeted by other PRR binding partners i.e., CIN85, ITSN or even Mena a common interactor of both SHIP2 and IRSp53. We presented evidence that IRSp53 phosphorylation on S366 did not influence its interaction with SHIP2 and that Mena is not necessary for the association of SHIP2 with IRSp53 in MDA-MB-231 cells. The absence of Mena in MDA-MB-231 cells decreased the intracellular content in F-actin and modified the subcellular localization of SHIP2 and IRSp53 by increasing their relative content at the plasma membrane. Together our data suggest that SHIP2, through interaction with the cell protrusion regulators IRSp53 and Mena, participate to the formation of multi-protein complexes. This ensures the appropriate modulations of PIs which is important for regulation of membrane dynamics.
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Affiliation(s)
- Mathieu Antoine
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaire (IRIBHM), Université Libre de Bruxelles, Campus Erasme, 1070 Brussels, Belgium.
| | - Isabelle Vandenbroere
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaire (IRIBHM), Université Libre de Bruxelles, Campus Erasme, 1070 Brussels, Belgium
| | - Somadri Ghosh
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaire (IRIBHM), Université Libre de Bruxelles, Campus Erasme, 1070 Brussels, Belgium
| | - Christophe Erneux
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaire (IRIBHM), Université Libre de Bruxelles, Campus Erasme, 1070 Brussels, Belgium
| | - Isabelle Pirson
- Institut de Recherche Interdisciplinaire en Biologie Humaine et moléculaire (IRIBHM), Université Libre de Bruxelles, Campus Erasme, 1070 Brussels, Belgium.
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2
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Su KJ, Yu YL. Downregulation of SHIP2 by Hepatitis B Virus X Promotes the Metastasis and Chemoresistance of Hepatocellular Carcinoma through SKP2. Cancers (Basel) 2019; 11:cancers11081065. [PMID: 31357665 PMCID: PMC6721294 DOI: 10.3390/cancers11081065] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 07/24/2019] [Accepted: 07/25/2019] [Indexed: 02/07/2023] Open
Abstract
Hepatitis B virus (HBV)-encoded X protein (HBx) plays an important role in the development of hepatocellular carcinoma (HCC). The protein SH2 domain containing inositol 5-phosphatase 2 (SHIP2) belongs to the family of enzymes that dephosphorylate the 5 position of PI(3,4,5)P3 to produce PI(3,4)P2. Expression of SHIP2 has been associated with several cancers including HCC. However, its role in the development of HBV-related HCC remains elusive. In this study, we performed tissue microarray analysis using 49 cases of HCC to explore SHIP2 expression changes and found that SHIP2 was downregulated in HBV-positive HCC. In addition, S-phase kinase-associated protein 2 (SKP2), a component of the E3 ubiquitin–ligase complex, was increased in HCC cell lines that overexpressed HBx, which also showed a notable accumulation of polyubiquitinated SHIP2. Moreover, HCC cells with silenced SHIP2 had increased expression of mesenchymal markers, which promotes cell migration, enhances glucose uptake, and leads to resistance to the chemotherapy drug (5-Fluorouracil, 5-FU). Taken together, our results demonstrate that HBx downregulates SHIP2 through SKP2 and suggest a potential role for SHIP2 in HBx-mediated HCC migration.
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Affiliation(s)
- Kuo-Jung Su
- The Ph.D. Program for Cancer Biology and Drug Discovery, China Medical University and Academia Sinica, Taichung 404, Taiwan
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 404, Taiwan
- Center for Molecular Medicine, China Medical University Hospital, Taichung 404, Taiwan
| | - Yung-Luen Yu
- The Ph.D. Program for Cancer Biology and Drug Discovery, China Medical University and Academia Sinica, Taichung 404, Taiwan.
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 404, Taiwan.
- Center for Molecular Medicine, China Medical University Hospital, Taichung 404, Taiwan.
- Drug Development Center, China Medical University, Taichung 404, Taiwan.
- Department of Biotechnology, Asia University, Taichung 413, Taiwan.
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3
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Thomas MP, Erneux C, Potter BVL. SHIP2: Structure, Function and Inhibition. Chembiochem 2017; 18:233-247. [DOI: 10.1002/cbic.201600541] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Mark P. Thomas
- Department of Pharmacy and Pharmacology; University of Bath; Claverton Down Bath BA2 7AY UK
| | - Christophe Erneux
- I.R.I.B.H.M.; Université Libre de Bruxelles; Campus Erasme 808 Route de Lennik 1070 Brussels Belgium
| | - Barry V. L. Potter
- Drug Discovery and Medicinal Chemistry; Department of Pharmacology; University of Oxford; Mansfield Road Oxford OX1 3QT UK
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4
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Yang CY, Chiu LL, Tan TH. TRAF2-mediated Lys63-linked ubiquitination of DUSP14/MKP6 is essential for its phosphatase activity. Cell Signal 2016; 28:145-51. [DOI: 10.1016/j.cellsig.2015.10.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 10/24/2015] [Indexed: 12/27/2022]
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5
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Belle L, Ali N, Lonic A, Li X, Paltridge JL, Roslan S, Herrmann D, Conway JRW, Gehling FK, Bert AG, Crocker LA, Tsykin A, Farshid G, Goodall GJ, Timpson P, Daly RJ, Khew-Goodall Y. The tyrosine phosphatase PTPN14 (Pez) inhibits metastasis by altering protein trafficking. Sci Signal 2015; 8:ra18. [PMID: 25690013 DOI: 10.1126/scisignal.2005547] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Factors secreted by tumor cells shape the local microenvironment to promote invasion and metastasis, as well as condition the premetastatic niche to enable secondary-site colonization and growth. In addition to this secretome, tumor cells have increased abundance of growth-promoting receptors at the cell surface. We found that the tyrosine phosphatase PTPN14 (also called Pez, which is mutated in various cancers) suppressed metastasis by reducing intracellular protein trafficking through the secretory pathway. Knocking down PTPN14 in tumor cells or injecting the peritoneum of mice with conditioned medium from PTPN14-deficient cell cultures promoted the growth and metastasis of breast cancer xenografts. Loss of catalytically functional PTPN14 increased the secretion of growth factors and cytokines, such as IL-8 (interleukin-8), and increased the abundance of EGFR (epidermal growth factor receptor) at the cell surface of breast cancer cells and of FLT4 (vascular endothelial growth factor receptor 3) at the cell surface of primary lymphatic endothelial cells. We identified RIN1 (Ras and Rab interactor 1) and PRKCD (protein kinase C-δ) as binding partners and substrates of PTPN14. Similar to cells overexpressing PTPN14, receptor trafficking to the cell surface was inhibited in cells that lacked PRKCD or RIN1 or expressed a nonphosphorylatable RIN1 mutant, and cytokine secretion was decreased in cells treated with PRKCD inhibitors. Invasive breast cancer tissue had decreased expression of PTPN14, and patient survival was worse when tumors had increased expression of the genes encoding RIN1 or PRKCD. Thus, PTPN14 prevents metastasis by restricting the trafficking of both soluble and membrane-bound proteins.
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Affiliation(s)
- Leila Belle
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia. Discipline of Biochemistry, School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Naveid Ali
- Cancer Research Program, Garvan Institute of Medical Research, Darlinghurst, New South Wales 2010, Australia
| | - Ana Lonic
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia. Department of Medicine, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Xiaochun Li
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia
| | - James L Paltridge
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia. Discipline of Biochemistry, School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Suraya Roslan
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia
| | - David Herrmann
- Cancer Research Program, The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales 2010, Australia
| | - James R W Conway
- Cancer Research Program, The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales 2010, Australia
| | - Freya K Gehling
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia
| | - Andrew G Bert
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia
| | - Lesley A Crocker
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia
| | - Anna Tsykin
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia
| | - Gelareh Farshid
- Division of Tissue Pathology, SA Pathology, Adelaide, South Australia 5000, Australia
| | - Gregory J Goodall
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia. Department of Medicine, The University of Adelaide, Adelaide, South Australia 5005, Australia. School and Molecular and Biomedical Science, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Paul Timpson
- Cancer Research Program, The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales 2010, Australia
| | - Roger J Daly
- Cancer Research Program, Garvan Institute of Medical Research, Darlinghurst, New South Wales 2010, Australia. Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
| | - Yeesim Khew-Goodall
- Centre for Cancer Biology, an Alliance between SA Pathology and University of South Australia, Adelaide, South Australia 5000, Australia. Discipline of Biochemistry, School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, South Australia 5005, Australia. Department of Medicine, The University of Adelaide, Adelaide, South Australia 5005, Australia.
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Ray S, Zhao Y, Jamaluddin M, Edeh CB, Lee C, Brasier AR. Inducible STAT3 NH2 terminal mono-ubiquitination promotes BRD4 complex formation to regulate apoptosis. Cell Signal 2014; 26:1445-55. [PMID: 24657799 PMCID: PMC4067092 DOI: 10.1016/j.cellsig.2014.03.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 02/24/2014] [Accepted: 03/10/2014] [Indexed: 10/25/2022]
Abstract
Signal Transducers and Activator of Transcription-3 (STAT3) are latent transcription factors that are regulated by post-translational modifications (PTMs) in response to cellular activation by the IL-6 superfamily of cytokines to regulate cell cycle progression and/or apoptosis. Here we observe that STAT3 is inducibly mono-ubiquitinated and investigate its consequences. Using domain mapping and highly specific selected reaction monitoring-mass spectrometric assays, we identify lysine (K) 97 in its NH2-terminal domain as the major mono-ubiquitin conjugation site. We constructed a mono-ubiquitinated mimic consisting of a deubiquitinase-resistant monomeric ubiquitin fused to the NH2 terminus of STAT3 (ubiquitinated-STAT3 FP). In complex assays of ectopically expressed ubi-STAT3-FP, we observed enhanced complex formation with bromodomain-containing protein 4 (BRD4), a component of the activated positive transcriptional elongation factor (P-TEFb) complex. Chromatin immunoprecipitation experiments in STAT3(+/-) and STAT3(-/-) MEFs showed BRD4 recruitment to STAT3-dependent suppressor of cytokine signaling-3 gene (SOCS3). The effect of a selective small molecule inhibitor of BRD4, JQ1, to inhibit SOCS3 expression demonstrated the functional role of BRD4 for STAT3-dependent transcription. Additionally, ectopic ubiquitinated-STAT3 FP expression upregulated BCL2, BCL2L1, APEX1, SOD2, CCND1 and MYC expression indicating the role of ubiquitinated STAT3 in anti-apoptosis and cellular proliferation. Finally we observed that ubiquitinated-STAT3 FP suppressed TNFα-induced apoptotic cell death, indicating the functional importance of mono-ubiquitinated STAT3 in antiapoptotic gene expression. We conclude that STAT3 mono-ubiquitination is a key trigger in BRD4-dependent antiapoptotic and pro-proliferative gene expression programs. Thus, inhibiting the STAT3 mono-ubiquitination-BRD4 pathway may be a novel therapeutic target for the treatment of STAT3-dependent proliferative diseases.
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Affiliation(s)
- Sutapa Ray
- Sealy Center for Molecular Medicine, University of Texas Medical Branch, Galveston, TX 77555, United States; Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555, United States
| | - Yingxin Zhao
- Sealy Center for Molecular Medicine, University of Texas Medical Branch, Galveston, TX 77555, United States; Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555, United States; Institute for Translational Sciences, University of Texas Medical Branch, Galveston, TX 77555, United States
| | - Mohammad Jamaluddin
- Institute for Translational Sciences, University of Texas Medical Branch, Galveston, TX 77555, United States
| | - Chukwudi B Edeh
- Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555, United States
| | - Chang Lee
- Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555, United States
| | - Allan R Brasier
- Sealy Center for Molecular Medicine, University of Texas Medical Branch, Galveston, TX 77555, United States; Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555, United States; Institute for Translational Sciences, University of Texas Medical Branch, Galveston, TX 77555, United States.
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7
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Deneubourg L, Elong Edimo W, Moreau C, Vanderwinden JM, Erneux C. Phosphorylated SHIP2 on Y1135 localizes at focal adhesions and at the mitotic spindle in cancer cell lines. Cell Signal 2014; 26:1193-203. [DOI: 10.1016/j.cellsig.2014.02.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 01/20/2014] [Accepted: 02/13/2014] [Indexed: 11/30/2022]
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8
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Xie J, Erneux C, Pirson I. How does SHIP1/2 balance PtdIns(3,4)P2 and does it signal independently of its phosphatase activity? Bioessays 2013; 35:733-43. [PMID: 23650141 DOI: 10.1002/bies.201200168] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The number of cellular events identified as being directly or indirectly modulated by phosphoinositides dramatically increased in the recent years. Part of the complexity results from the fact that the seven phosphoinositides play second messenger functions in many different areas of growth factors and insulin signaling, cytoskeletal organization, membrane dynamics, trafficking, or nuclear signaling. PtdIns(3,4)P2 is commonly reported as a product of the SH2 domain-containing inositol 5-phosphatases 1/2 (SHIP1 and SHIP2) that dephosphorylate PtdIns(3,4,5)P3 at the 5-position. Here we discuss recent interest in PtdIns(3,4)P2 signaling highlighting its involvement in key cellular mechanisms such as cell adhesion, migration, and cytoskeletal regulation. We question and discuss the involvement of SHIP2 either as a PI 5-phosphatase or as a scaffold protein in insulin signaling, cytoskeletal dynamics, and endocytosis of growth factor receptors.
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Affiliation(s)
- Jingwei Xie
- Department of Pathophysiology, China Medical University, Heping District, Shenyang Liaoning Province, China
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9
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Elong Edimo W, Vanderwinden JM, Erneux C. SHIP2 signalling at the plasma membrane, in the nucleus and at focal contacts. Adv Biol Regul 2013; 53:28-37. [PMID: 23040614 DOI: 10.1016/j.jbior.2012.09.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Accepted: 09/04/2012] [Indexed: 06/01/2023]
Abstract
Phosphoinositide 5-phosphatases are critical enzymes in modulating the concentrations of PI(3,4,5)P(3), PI(4,5)P(2) and PI(3,5)P(2). The SH2 domain containing inositol 5-phosphatases SHIP1 and SHIP2 belong to this family of enzymes very much involved in physiopathology and development. Therefore activity and localization of the enzymes are particularly important taking into account both catalytic and non-catalytic mechanisms of the SHIP phosphatases. Several different mechanisms have been reported for SHIP2 targeting that often result from specific protein:protein interactions. In unstimulated astrocytoma cells, SHIP2 has a perinuclear and cytoplasmic localization. In serum-stimulated cells, SHIP2 can be localized at the plasma membrane and at focal contacts in polarized cells. A phosphorylated form of SHIP2 on S132 can be found in the nucleus and nuclear speckles. When present at the plasma membrane, SHIP2 may control the intracellular level of PI(3,4,5)P(3) thereby producing PI(3,4)P(2). When present in the nucleus, SHIP2 probably associates to other nuclear proteins such as lamin A/C and could potentially control nuclear PI(4,5)P(2). Finally, its presence at focal adhesions and lamellipodia could suggest a role in cell adhesion and migration. It is proposed that the complex phenotype observed in SHIP2 mutant mice in tissue development and growth could result from the addition of plasma membrane and nuclear effects consecutive to SHIP2 alteration.
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Affiliation(s)
- William's Elong Edimo
- Interdisciplinary Research Institute (IRIBHM), Université Libre de Bruxelles, Campus Erasme, Bldg. C, 808 Route de Lennik, 1070 Brussels, Belgium
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10
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Mills SJ, Persson C, Cozier G, Thomas MP, Trésaugues L, Erneux C, Riley AM, Nordlund P, Potter BVL. A synthetic polyphosphoinositide headgroup surrogate in complex with SHIP2 provides a rationale for drug discovery. ACS Chem Biol 2012; 7:822-8. [PMID: 22330088 PMCID: PMC3355655 DOI: 10.1021/cb200494d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Phosphoinositides regulate many cellular processes, and cellular levels are controlled by kinases and phosphatases. SHIP2 (SH2 (Src homology 2)-domain-containing inositol-phosphatase-2) plays a critical role in phosphoinositide signaling, cleaving the 5-phosphate from phosphatidylinositol 3,4,5-trisphosphate. SHIP2 is thought to be involved in type-2 diabetes and obesity, conditions that could therefore be open to pharmacological modulation of the enzyme. However, rational design of SHIP2 inhibitors has been limited by the absence of a high-resolution structure. Here, we present a 2.1 Å resolution crystal structure of the phosphatase domain of SHIP2 bound to the synthetic ligand biphenyl 2,3',4,5',6-pentakisphosphate (BiPh(2,3',4,5',6)P(5)). BiPh(2,3',4,5',6)P(5) is not a SHIP2 substrate but inhibits Ins(1,3,4,5)P(4) hydrolysis with an IC(50) of 24.8 ± 3.0 μM, (K(m) for Ins(1,3,4,5)P(4) is 215 ± 28 μM). Molecular dynamics simulations suggest that when BiPh(2,3',4,5',6)P(5) binds to SHIP2, a flexible loop folds over and encloses the ligand. Compounds targeting such a closed conformation might therefore deliver SHIP2-specific drugs.
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Affiliation(s)
- Stephen J. Mills
- Wolfson Laboratory of Medicinal
Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K
| | | | - Gyles Cozier
- Wolfson Laboratory of Medicinal
Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K
| | - Mark P. Thomas
- Wolfson Laboratory of Medicinal
Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K
| | | | - Christophe Erneux
- Institut de Recherche Interdisciplinaire
(IRIBHM), Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Andrew M. Riley
- Wolfson Laboratory of Medicinal
Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K
| | - Pär Nordlund
- School of Biological Sciences, Nanyang Technological University, Singapore 637551
| | - Barry V. L. Potter
- Wolfson Laboratory of Medicinal
Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K
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Mukherjee O, Weingarten L, Padberg I, Pracht C, Sinha R, Hochdörfer T, Kuppig S, Backofen R, Reth M, Huber M. The SH2-domain of SHIP1 interacts with the SHIP1 C-terminus: impact on SHIP1/Ig-α interaction. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2011; 1823:206-14. [PMID: 22182704 DOI: 10.1016/j.bbamcr.2011.11.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 11/03/2011] [Accepted: 11/07/2011] [Indexed: 10/14/2022]
Abstract
The SH2-containing inositol 5'-phosphatase, SHIP1, negatively regulates signal transduction from the B cell antigen receptor (BCR). The mode of coupling between SHIP1 and the BCR has not been elucidated so far. In comparison to wild-type cells, B cells expressing a mutant IgD- or IgM-BCR containing a C-terminally truncated Ig-α respond to pervanadate stimulation with markedly reduced tyrosine phosphorylation of SHIP1 and augmented activation of protein kinase B. This indicates that SHIP1 is capable of interacting with the C-terminus of Ig-α. Employing a system of fluorescence resonance energy transfer in S2 cells, we can clearly demonstrate interaction between the SH2-domain of SHIP1 and Ig-α. Furthermore, a fluorescently labeled SH2-domain of SHIP1 translocates to the plasma membrane in an Ig-α-dependent manner. Interestingly, whereas the SHIP1 SH2-domain can be pulled-down with phospho-peptides corresponding to the immunoreceptor tyrosine-based activation motif (ITAM) of Ig-α from detergent lysates, no interaction between full-length SHIP1 and the phosphorylated Ig-α ITAM can be observed. Further studies show that the SH2-domain of SHIP1 can bind to the C-terminus of the SHIP1 molecule, most probably by inter- as well as intra-molecular means, and that this interaction regulates the association between different forms of SHIP1 and Ig-α.
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Affiliation(s)
- Oindrilla Mukherjee
- RWTH Aachen University, Medical Faculty, Department of Biochemistry and Molecular Immunology, Institute of Biochemistry and Molecular Biology, 52074 Aachen, Germany
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12
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Erneux C, Edimo WE, Deneubourg L, Pirson I. SHIP2 multiple functions: a balance between a negative control of PtdIns(3,4,5)P₃ level, a positive control of PtdIns(3,4)P₂ production, and intrinsic docking properties. J Cell Biochem 2011; 112:2203-9. [PMID: 21503961 DOI: 10.1002/jcb.23146] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The SH2 domain containing inositol 5-phosphatase 2 (SHIP2) belongs to the family of the mammalian inositol polyphosphate 5-phosphatases. The two closely related isoenzymes SHIP1 (or SHIP) and SHIP2 contain a N-terminal SH2 domain, a catalytic domain, potential PTB domain-binding sites (NPXY), and C-terminal proline-rich regions with consensus sites for SH3 domain interactions. In addition, SHIP2 contains a unique sterile alpha motif (SAM) domain that could be involved in SAM-SAM domain interactions with other proteins or receptors. SHIP2 also shows the presence of an ubiquitin interacting motif at the C-terminal end. SHIP2 is essentially a PI(3,4,5)P(3) 5-phosphatase that negatively controls PI(3,4,5)P(3) levels in intact cells and produce PI(3,4)P(2) . Depending on the cells and stimuli, PI(3,4)P(2) could accumulate at important levels and be a "second messenger" by its own. It could interact with a very large number of target proteins such as PKB or TAPP1 and 2 that control insulin sensitivity. In addition to its catalytic activity, SHIP2 is also a docking protein for a large number of proteins: Cytoskeletal, focal adhesion proteins, scaffold proteins, adaptors, protein phosphatases, and tyrosine kinase associated receptors. These interactions could play a role in the control of cell adhesion, migration, or endocytosis of some receptors. SHIP2 could be acting independently of its phosphatase activity being part of a protein network of some receptors, e.g., the EGF receptor or BCR/ABL. These non-catalytic properties associated to a PI phosphatase have also been reported for other enzymes of the metabolism of myo-inositol such as Ins(1,4,5)P(3) 3-kinases, inositol phosphate multikinase (IPMK), or PTEN.
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Affiliation(s)
- Christophe Erneux
- Institut de Recherche Interdisciplinaire (IRIBHM), Université Libre de Bruxelles, Campus Erasme, Bldg. C, 808 Route de Lennik, 1070 Brussels, Belgium.
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13
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Yang WL, Zhang X, Lin HK. Emerging role of Lys-63 ubiquitination in protein kinase and phosphatase activation and cancer development. Oncogene 2010; 29:4493-503. [PMID: 20531303 PMCID: PMC3008764 DOI: 10.1038/onc.2010.190] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Revised: 04/01/2010] [Accepted: 04/21/2010] [Indexed: 12/31/2022]
Abstract
Ubiquitination is an important post-translational modification that has a pivotal role in numerous biological functions, such as cell growth, proliferation, apoptosis, DNA damage response, innate immune response and neuron degeneration. Although ubiquitination is thought to achieve these functions by targeting proteins for proteasome-dependent degradation, recent studies suggest that ubiquitination also has nonproteolytic functions, such as protein trafficking, kinase and phosphatase activation, which are involved in cell survival and cancer development. These progresses have advanced our current understanding of the novel functions of ubiquitination in signal transduction pathways and may provide novel paradigms for the treatment of human cancers.
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Affiliation(s)
- Wei-Lei Yang
- Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA
- The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX 77030, USA
| | - Xian Zhang
- Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA
- The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX 77030, USA
| | - Hui-Kuan Lin
- Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA
- The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX 77030, USA
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