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Lamsoul I, Dupré L, Lutz PG. Molecular Tuning of Filamin A Activities in the Context of Adhesion and Migration. Front Cell Dev Biol 2020; 8:591323. [PMID: 33330471 PMCID: PMC7714767 DOI: 10.3389/fcell.2020.591323] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 11/05/2020] [Indexed: 01/08/2023] Open
Abstract
The dynamic organization of actin cytoskeleton meshworks relies on multiple actin-binding proteins endowed with distinct actin-remodeling activities. Filamin A is a large multi-domain scaffolding protein that cross-links actin filaments with orthogonal orientation in response to various stimuli. As such it plays key roles in the modulation of cell shape, cell motility, and differentiation throughout development and adult life. The essentiality and complexity of Filamin A is highlighted by mutations that lead to a variety of severe human disorders affecting multiple organs. One of the most conserved activity of Filamin A is to bridge the actin cytoskeleton to integrins, thereby maintaining the later in an inactive state. We here review the numerous mechanisms cells have developed to adjust Filamin A content and activity and focus on the function of Filamin A as a gatekeeper to integrin activation and associated adhesion and motility.
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Affiliation(s)
- Isabelle Lamsoul
- Centre de Physiopathologie de Toulouse Purpan, INSERM, CNRS, Université de Toulouse, UPS, Toulouse, France
| | - Loïc Dupré
- Centre de Physiopathologie de Toulouse Purpan, INSERM, CNRS, Université de Toulouse, UPS, Toulouse, France.,Ludwig Boltzmann Institute for Rare and Undiagnosed Diseases, Vienna, Austria
| | - Pierre G Lutz
- Centre de Physiopathologie de Toulouse Purpan, INSERM, CNRS, Université de Toulouse, UPS, Toulouse, France
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2
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Spinner CA, Lamsoul I, Métais A, Febrissy C, Moog-Lutz C, Lutz PG. The E3 Ubiquitin Ligase Asb2α in T Helper 2 Cells Negatively Regulates Antitumor Immunity in Colorectal Cancer. Cancer Immunol Res 2019; 7:1332-1344. [PMID: 31175139 DOI: 10.1158/2326-6066.cir-18-0562] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 01/14/2019] [Accepted: 06/05/2019] [Indexed: 11/16/2022]
Abstract
The escape of cancer cells from host immunosurveillance involves a shift in immune responses, including an imbalance in Th1 and Th2 cells. A Th1-dominated immune response predicts positive outcomes in colorectal cancer. The E3 ubiquitin ligase, Asb2α, is expressed in Th2 cells, but its roles in T-cell maturation and cancer are unclear. We provide evidence that the Th2 master regulator, Gata3, induces Asb2 Loss of Asb2 did not affect Th differentiation ex vivo, but reduced IL4 production from Th2 cells. We found that high ASB2 expression was associated with poor outcome in colorectal cancer. Loss of Asb2 from hematopoietic cells promoted a Th1 response and attenuated colitis-associated tumorigenesis in mice. Diminished Th2 function correlated with increased IFNγ production and an enhanced type 1 antitumor immune response in Asb2-deficient mice. Our work suggests that Asb2α promotes a Th2 phenotype in vivo, which in turn is associated with tumor progression in a mouse model of colitis.
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Affiliation(s)
- Camille A Spinner
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Isabelle Lamsoul
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, UPS, Toulouse, France.
| | - Arnaud Métais
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Chanaëlle Febrissy
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Christel Moog-Lutz
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Pierre G Lutz
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, UPS, Toulouse, France.
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3
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Métais A, Lamsoul I, Melet A, Uttenweiler-Joseph S, Poincloux R, Stefanovic S, Valière A, Gonzalez de Peredo A, Stella A, Burlet-Schiltz O, Zaffran S, Lutz PG, Moog-Lutz C. Asb2α-Filamin A Axis Is Essential for Actin Cytoskeleton Remodeling During Heart Development. Circ Res 2018; 122:e34-e48. [PMID: 29374072 DOI: 10.1161/circresaha.117.312015] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Revised: 01/18/2018] [Accepted: 01/24/2018] [Indexed: 11/16/2022]
Abstract
RATIONALE Heart development involves differentiation of cardiac progenitors and assembly of the contractile sarcomere apparatus of cardiomyocytes. However, little is known about the mechanisms that regulate actin cytoskeleton remodeling during cardiac cell differentiation. OBJECTIVE The Asb2α (Ankyrin repeat-containing protein with a suppressor of cytokine signaling box 2) CRL5 (cullin 5 RING E3 ubiquitin ligase) triggers polyubiquitylation and subsequent degradation by the proteasome of FLNs (filamins). Here, we investigate the role of Asb2α in heart development and its mechanisms of action. METHODS AND RESULTS Using Asb2 knockout embryos, we show that Asb2 is an essential gene, critical to heart morphogenesis and function, although its loss does not interfere with the overall patterning of the embryonic heart tube. We show that the Asb2α E3 ubiquitin ligase controls Flna stability in immature cardiomyocytes. Importantly, Asb2α-mediated degradation of the actin-binding protein Flna marks a previously unrecognized intermediate step in cardiac cell differentiation characterized by cell shape changes and actin cytoskeleton remodeling. We further establish that in the absence of Asb2α, myofibrils are disorganized and that heartbeats are inefficient, leading to embryonic lethality in mice. CONCLUSIONS These findings identify Asb2α as an unsuspected key regulator of cardiac cell differentiation and shed light on the molecular and cellular mechanisms determining the onset of myocardial cell architecture and its link with early cardiac function. Although Flna is known to play roles in cytoskeleton organization and to be required for heart function, this study now reveals that its degradation mediated by Asb2α ensures essential functions in differentiating cardiac progenitors.
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Affiliation(s)
- Arnaud Métais
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Isabelle Lamsoul
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Armelle Melet
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Sandrine Uttenweiler-Joseph
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Renaud Poincloux
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Sonia Stefanovic
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Amélie Valière
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Anne Gonzalez de Peredo
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Alexandre Stella
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Odile Burlet-Schiltz
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Stéphane Zaffran
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.)
| | - Pierre G Lutz
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.).
| | - Christel Moog-Lutz
- From the Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, France (A. Métais, I.L., A. Melet, S.U.-J., R.P., A.V., A.G.d.P., A.S., O.B.-S., P.G.L., C.M.-L.); CNRS UMR8601, Université Paris Descartes, France (A. Melet); and Aix Marseille Univ, INSERM, MMG, France (S.S., S.Z.).
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4
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Spinner CA, Uttenweiler-Joseph S, Metais A, Stella A, Burlet-Schiltz O, Moog-Lutz C, Lamsoul I, Lutz PG. Substrates of the ASB2α E3 ubiquitin ligase in dendritic cells. Sci Rep 2015; 5:16269. [PMID: 26537633 PMCID: PMC4633680 DOI: 10.1038/srep16269] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 10/12/2015] [Indexed: 11/17/2022] Open
Abstract
Conventional dendritic cells (cDCs) comprise distinct populations with specialized immune functions that are mediators of innate and adaptive immune responses. Transcriptomic and proteomic approaches have been used so far to identify transcripts and proteins that are differentially expressed in these subsets to understand the respective functions of cDCs subsets. Here, we showed that the Cullin 5-RING E3 ubiquitin ligase (E3) ASB2α, by driving degradation of filamin A (FLNa) and filamin B (FLNb), is responsible for the difference in FLNa and FLNb abundance in the different spleen cDC subsets. Importantly, the ability of these cDC subsets to migrate correlates with the level of FLNa. Furthermore, our results strongly point to CD4 positive and double negative cDCs as distinct populations. Finally, we develop quantitative global proteomic approaches to identify ASB2α substrates in DCs using ASB2 conditional knockout mice. As component of the ubiquitin-proteasome system (UPS) are amenable to pharmacological manipulation, these approaches aimed to the identification of E3 substrates in physiological relevant settings could potentially lead to novel targets for therapeutic strategies.
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Affiliation(s)
- Camille A Spinner
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale); 205 route de Narbonne BP 64182, F-31077 Toulouse, France.,Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Sandrine Uttenweiler-Joseph
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale); 205 route de Narbonne BP 64182, F-31077 Toulouse, France.,Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Arnaud Metais
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale); 205 route de Narbonne BP 64182, F-31077 Toulouse, France.,Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Alexandre Stella
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale); 205 route de Narbonne BP 64182, F-31077 Toulouse, France.,Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Odile Burlet-Schiltz
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale); 205 route de Narbonne BP 64182, F-31077 Toulouse, France.,Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Christel Moog-Lutz
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale); 205 route de Narbonne BP 64182, F-31077 Toulouse, France.,Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Isabelle Lamsoul
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale); 205 route de Narbonne BP 64182, F-31077 Toulouse, France.,Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Pierre G Lutz
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale); 205 route de Narbonne BP 64182, F-31077 Toulouse, France.,Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
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5
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Zakaria R, Lamsoul I, Uttenweiler-Joseph S, Erard M, Monsarrat B, Burlet-Schiltz O, Moog-Lutz C, Lutz PG. Phosphorylation of serine 323 of ASB2α is pivotal for the targeting of filamin A to degradation. Cell Signal 2013; 25:2823-30. [PMID: 24044920 DOI: 10.1016/j.cellsig.2013.09.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 09/06/2013] [Indexed: 10/26/2022]
Abstract
ASB proteins are the specificity subunits of cullin5-RING E3 ubiquitin ligases (CRL5) that play roles in ubiquitin-mediated protein degradation. However, how their activity is regulated remains poorly understood. Here, we unravel a novel mechanism of regulation of a CRL5 through phosphorylation of its specificity subunit ASB2α. Indeed, using mass spectrometry, we showed for the first time that ASB2α is phosphorylated and that phosphorylation of serine-323 (Ser-323) of ASB2α is crucial for the targeting of the actin-binding protein filamin A (FLNa) to degradation. Mutation of ASB2α Ser-323 to Ala had no effect on intrinsic E3 ubiquitin ligase activity of ASB2α but abolished the ability of ASB2α to induce degradation of FLNa. In contrast, the ASB2α Ser-323 to Asp phosphomimetic mutant induced acute degradation of FLNa. Moreover, inhibition of the extracellular signal-regulated kinases 1 and 2 (Erk1/2) activity reduced ASB2α-mediated FLNa degradation. We further showed that the subcellular localization of ASB2α to actin-rich structures is dependent on ASB2α Ser-323 phosphorylation and propose that the interaction with FLNa depends on the electrostatic potential redistribution induced by the Ser-323 phosphate group. Taken together, these data unravel an important mechanism by which ASB2α-mediated FLNa degradation can be regulated.
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Affiliation(s)
- Rim Zakaria
- CNRS; IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne BP 64182, F-31077 Toulouse, France; Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
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6
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Lamsoul I, Erard M, van der Ven PFM, Lutz PG. Filamins but not Janus kinases are substrates of the ASB2α cullin-ring E3 ubiquitin ligase in hematopoietic cells. PLoS One 2012; 7:e43798. [PMID: 22916308 PMCID: PMC3423375 DOI: 10.1371/journal.pone.0043798] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Accepted: 07/26/2012] [Indexed: 11/19/2022] Open
Abstract
The ASB2α protein is the specificity subunit of an E3 ubiquitin ligase complex involved in hematopoietic differentiation and is proposed to exert its effects by regulating the turnover of specific proteins. Three ASB2α substrates have been described so far: the actin-binding protein filamins, the Mixed Lineage Leukemia protein, and the Janus kinases 2 and 3. To determine the degradation of which substrate drives ASB2α biological effects is crucial for the understanding of ASB2α functions in hematopoiesis. Here, we show that neither endogenous nor exogenously expressed ASB2α induces degradation of JAK proteins in hematopoietic cells. Furthermore, we performed molecular modeling to generate the first structural model of an E3 ubiquitin ligase complex of an ASB protein bound to one of its substrates.
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Affiliation(s)
- Isabelle Lamsoul
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne BP64182, F-31077 Toulouse, France
- Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Monique Erard
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne BP64182, F-31077 Toulouse, France
- Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Peter F. M. van der Ven
- Department of Molecular Cell Biology, Institute of Cell Biology, University of Bonn, Bonn, Germany
| | - Pierre G. Lutz
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne BP64182, F-31077 Toulouse, France
- Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
- * E-mail:
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7
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Guiet R, Vérollet C, Lamsoul I, Cougoule C, Poincloux R, Labrousse A, Calderwood DA, Glogauer M, Lutz PG, Maridonneau-Parini I. Macrophage mesenchymal migration requires podosome stabilization by filamin A. J Biol Chem 2012; 287:13051-62. [PMID: 22334688 DOI: 10.1074/jbc.m111.307124] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Filamin A (FLNa) is a cross-linker of actin filaments and serves as a scaffold protein mostly involved in the regulation of actin polymerization. It is distributed ubiquitously, and null mutations have strong consequences on embryonic development in humans, with organ defects which suggest deficiencies in cell migration. We have reported previously that macrophages, the archetypal migratory cells, use the protease- and podosome-dependent mesenchymal migration mode in dense three-dimensional environments, whereas they use the protease- and podosome-independent amoeboid mode in more porous matrices. Because FLNa has been shown to localize to podosomes, we hypothesized that the defects seen in patients carrying FLNa mutations could be related to the capacity of certain cell types to form podosomes. Using strategies based on FLNa knock-out, knockdown, and rescue, we show that FLNa (i) is involved in podosome stability and their organization as rosettes and three-dimensional podosomes, (ii) regulates the proteolysis of the matrix mediated by podosomes in macrophages, (iii) is required for podosome rosette formation triggered by Hck, and (iv) is necessary for mesenchymal migration but dispensable for amoeboid migration. These new functions assigned to FLNa, particularly its role in mesenchymal migration, could be directly related to the defects in cell migration described during the embryonic development in FLNa-defective patients.
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Affiliation(s)
- Romain Guiet
- CNRS, Institut de Pharmacologie et de Biologie Structurale (IPBS), Unité Mixte de Recherche 5089, 205 route de Narbonne, Toulouse, France
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8
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Razinia Z, Baldassarre M, Bouaouina M, Lamsoul I, Lutz PG, Calderwood DA. The E3 ubiquitin ligase specificity subunit ASB2α targets filamins for proteasomal degradation by interacting with the filamin actin-binding domain. J Cell Sci 2011; 124:2631-41. [PMID: 21750192 DOI: 10.1242/jcs.084343] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Filamins are an important family of actin-binding and crosslinking proteins that mediate remodeling of the actin cytoskeleton and maintain extracellular matrix connections by anchoring transmembrane proteins to actin filaments and linking them to intracellular signaling cascades. We recently found that filamins are targeted for proteasomal degradation by the E3 ubiquitin ligase specificity subunit ASBα and that acute degradation of filamins through this ubiquitin-proteasome pathway correlates with cell differentiation. Specifically, in myeloid leukemia cells retinoic-acid-induced expression of ASB2α triggers filamin degradation and recapitulates early events crucial for cell differentiation. ASB2α is thought to link substrates to the ubiquitin transferase machinery; however, the mechanism by which ASB2α interacts with filamin to induce degradation remained unknown. Here, we use cell-based and biochemical assays to show that the subcellular localization of ASB2α to actin-rich structures is dependent on filamin and that the actin-binding domain (ABD) of filamin mediates the interaction with ASB2α. Furthermore, we show that the ABD is necessary and sufficient for ASB2α-mediated filamin degradation. We propose that ASB2α exerts its effect by binding the ABD and mediating its polyubiquitylation, so targeting filamins for degradation. These studies provide the molecular basis for ASB2α-mediated filamin degradation and unravel an important mechanism by which filamin levels can be acutely regulated.
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Affiliation(s)
- Ziba Razinia
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06520-8066, USA
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9
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Lamsoul I, Burande CF, Razinia Z, Houles TC, Menoret D, Baldassarre M, Erard M, Moog-Lutz C, Calderwood DA, Lutz PG. Functional and structural insights into ASB2alpha, a novel regulator of integrin-dependent adhesion of hematopoietic cells. J Biol Chem 2011; 286:30571-30581. [PMID: 21737450 DOI: 10.1074/jbc.m111.220921] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
By providing contacts between hematopoietic cells and the bone marrow microenvironment, integrins are implicated in cell adhesion and thereby in control of cell fate of normal and leukemia cells. The ASB2 gene, initially identified as a retinoic acid responsive gene and a target of the promyelocytic leukemia retinoic acid receptor α oncoprotein in acute promyelocytic leukemia cells, encodes two isoforms, a hematopoietic-type (ASB2α) and a muscle-type (ASB2β) that are involved in hematopoietic and myogenic differentiation, respectively. ASB2α is the specificity subunit of an E3 ubiquitin ligase complex that targets filamins to proteasomal degradation. To examine the relationship of the ASB2α structure to E3 ubiquitin ligase function, functional assays and molecular modeling were performed. We show that ASB2α, through filamin A degradation, enhances adhesion of hematopoietic cells to fibronectin, the main ligand of β1 integrins. Furthermore, we demonstrate that a short N-terminal region specific to ASB2α, together with ankyrin repeats 1 to 10, is necessary for association of ASB2α with filamin A. Importantly, the ASB2α N-terminal region comprises a 9-residue segment with predicted structural homology to the filamin-binding motifs of migfilin and β integrins. Together, these data provide new insights into the molecular mechanisms of ASB2α binding to filamin.
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Affiliation(s)
- Isabelle Lamsoul
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, 205 route de Narbonne, 31077 Toulouse, France; Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, 31077 Toulouse, France
| | - Clara F Burande
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, 205 route de Narbonne, 31077 Toulouse, France; Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, 31077 Toulouse, France
| | - Ziba Razinia
- Department of Pharmacology and Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, Connecticut 06520
| | - Thibault C Houles
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, 205 route de Narbonne, 31077 Toulouse, France; Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, 31077 Toulouse, France
| | - Delphine Menoret
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, 205 route de Narbonne, 31077 Toulouse, France; Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, 31077 Toulouse, France
| | - Massimiliano Baldassarre
- Department of Pharmacology and Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, Connecticut 06520
| | - Monique Erard
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, 205 route de Narbonne, 31077 Toulouse, France; Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, 31077 Toulouse, France
| | - Christel Moog-Lutz
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, 205 route de Narbonne, 31077 Toulouse, France; Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, 31077 Toulouse, France
| | - David A Calderwood
- Department of Pharmacology and Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, Connecticut 06520
| | - Pierre G Lutz
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, 205 route de Narbonne, 31077 Toulouse, France; Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, 31077 Toulouse, France.
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10
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Abstract
The HTLV-1 Tax protein both activates viral replication and is involved in HTLV-1-mediated transformation of T lymphocytes. The transforming properties of Tax include altering the expression of select cellular genes via activation of cellular pathways and perturbation of both cell cycle control mechanisms and apoptotic signals. The recent discovery that Tax undergoes a hierarchical sequence of posttranslational modifications that control its intracellular localization provides provocative insights into the mechanisms regulating Tax transcriptional and transforming activities.
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Affiliation(s)
- Julie Lodewick
- Institut de Recherches Microbiologiques J-M Wiame, Université Libre de Bruxelles, B-1070 Bruxelles, Belgium.
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11
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Baldassarre M, Razinia Z, Burande CF, Lamsoul I, Lutz PG, Calderwood DA. Filamins regulate cell spreading and initiation of cell migration. PLoS One 2009; 4:e7830. [PMID: 19915675 PMCID: PMC2773003 DOI: 10.1371/journal.pone.0007830] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2009] [Accepted: 10/19/2009] [Indexed: 01/26/2023] Open
Abstract
Mammalian filamins (FLNs) are a family of three large actin-binding proteins. FLNa, the founding member of the family, was implicated in migration by cell biological analyses and the identification of FLNA mutations in the neuronal migration disorder periventricular heterotopia. However, recent knockout studies have questioned the relevance of FLNa to cell migration. Here we have used shRNA-mediated knockdown of FLNa, FLNb or FLNa and FLNb, or, alternatively, acute proteasomal degradation of all three FLNs, to generate FLN-deficient cells and assess their ability to migrate. We report that loss of FLNa or FLNb has little effect on migration but that knockdown of FLNa and FLNb, or proteolysis of all three FLNs, impairs migration. The observed defect is primarily a deficiency in initiation of motility rather than a problem with maintenance of locomotion speed. FLN-deficient cells are also impaired in spreading. Re-expression of full length FLNa, but not re-expression of a mutated FLNa lacking immunoglobulin domains 19 to 21, reverts both the spreading and the inhibition of initiation of migration. Our results establish a role for FLNs in cell migration and spreading and suggest that compensation by other FLNs may mask phenotypes in single knockout or knockdown cells. We propose that interactions between FLNs and transmembrane or signalling proteins, mediated at least in part by immunoglobulin domains 19 to 21 are important for both cell spreading and initiation of migration.
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Affiliation(s)
- Massimiliano Baldassarre
- Department of Pharmacology and Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Ziba Razinia
- Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Clara F. Burande
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, Toulouse, France
- Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, Toulouse, France
| | - Isabelle Lamsoul
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, Toulouse, France
- Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, Toulouse, France
| | - Pierre G. Lutz
- Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, Toulouse, France
- Université de Toulouse, Université Paul Sabatier, Institut de Pharmacologie et de Biologie Structurale, Toulouse, France
| | - David A. Calderwood
- Department of Pharmacology and Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine, New Haven, Connecticut, United States of America
- * E-mail:
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12
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Bex F, Sampaio C, Lamsoul I, Lodewick J. Post-translational modifications of the Tax oncoprotein of human T-cell leukemia virus control cytoplasmic and nuclear steps in Tax-mediated activation of the NF-κB pathway. Retrovirology 2009. [PMCID: PMC2766971 DOI: 10.1186/1742-4690-6-s2-o17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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13
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Burande CF, Heuzé ML, Lamsoul I, Monsarrat B, Uttenweiler-Joseph S, Lutz PG. A label-free quantitative proteomics strategy to identify E3 ubiquitin ligase substrates targeted to proteasome degradation. Mol Cell Proteomics 2009; 8:1719-27. [PMID: 19376791 DOI: 10.1074/mcp.m800410-mcp200] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The ubiquitin-proteasome system is a central mechanism for controlled proteolysis that regulates numerous cellular processes in eukaryotes. As such, defects in this system can contribute to disease pathogenesis. In this pathway, E3 ubiquitin ligases provide platforms for binding specific substrates, thereby coordinating their ubiquitylation and subsequent degradation by the proteasome. Despite the identification of many E3 ubiquitin ligases, the identities of their specific substrates are still largely unresolved. The ankyrin repeat-containing protein with a suppressor of cytokine signaling box 2 (ASB2) gene that we initially identified as a retinoic acid-response gene in acute promyelocytic leukemia cells encodes the specificity subunit of an E3 ubiquitin ligase complex that is involved in hematopoietic cell differentiation. We have recently identified filamin A and filamin B as the first ASB2 targets and shown that ASB2 triggers ubiquitylation and proteasome-mediated degradation of these proteins. Here a global quantitative proteomics strategy is provided to identify substrates of E3 ubiquitin ligases targeted to proteasomal degradation. Indeed we used label-free methods for quantifying proteins identified by shotgun proteomics in extracts of cells expressing wild-type ASB2 or an E3 ubiquitin ligase-defective mutant of ASB2 under the control of an inducible promoter. Measurements of spectral count and mass spectrometric signal intensity demonstrated a drastic decrease of filamin A and filamin B in myeloid leukemia cells expressing wild-type ASB2 compared with cells expressing an E3 ubiquitin ligase-defective mutant of ASB2. Altogether we provide an original strategy that enables identification of E3 ubiquitin ligase substrates that have to be degraded.
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Affiliation(s)
- Clara F Burande
- Institut de Pharmacologie et de Biologie Structurale (IPBS) CNRS 205 Route de Narbonne and IPBS, Université Paul Sabatier Université de Toulouse, Toulouse France
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14
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Bello NF, Lamsoul I, Heuzé ML, Métais A, Moreaux G, Calderwood DA, Duprez D, Moog-Lutz C, Lutz PG. The E3 ubiquitin ligase specificity subunit ASB2beta is a novel regulator of muscle differentiation that targets filamin B to proteasomal degradation. Cell Death Differ 2009; 16:921-32. [PMID: 19300455 DOI: 10.1038/cdd.2009.27] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Ubiquitin-mediated protein degradation is the main mechanism for controlled proteolysis, which is crucial for muscle development and maintenance. The ankyrin repeat-containing protein with a suppressor of cytokine signaling box 2 gene (ASB2) encodes the specificity subunit of an E3 ubiquitin ligase complex involved in differentiation of hematopoietic cells. Here, we provide the first evidence that a novel ASB2 isoform, ASB2beta, is important for muscle differentiation. ASB2beta is expressed in muscle cells during embryogenesis and in adult tissues. ASB2beta is part of an active E3 ubiquitin ligase complex and targets the actin-binding protein filamin B (FLNb) for proteasomal degradation. Thus, ASB2beta regulates FLNb functions by controlling its degradation. Knockdown of endogenous ASB2beta by shRNAs during induced differentiation of C2C12 cells delayed FLNb degradation as well as myoblast fusion and expression of muscle contractile proteins. Finally, knockdown of FLNb in ASB2beta knockdown cells restores myogenic differentiation. Altogether, our results suggest that ASB2beta is involved in muscle differentiation through the targeting of FLNb to destruction by the proteasome.
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Affiliation(s)
- N F Bello
- Institut de Pharmacologie et de Biologie Structurale, CNRS, Toulouse, France
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15
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Lodewick J, Lamsoul I, Polania A, Lebrun S, Burny A, Ratner L, Bex F. Acetylation of the human T-cell leukemia virus type 1 Tax oncoprotein by p300 promotes activation of the NF-kappaB pathway. Virology 2009; 386:68-78. [PMID: 19200568 DOI: 10.1016/j.virol.2008.12.043] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2008] [Revised: 10/17/2008] [Accepted: 12/31/2008] [Indexed: 01/28/2023]
Abstract
The oncogenic potential of the HTLV-1 Tax protein involves activation of the NF-kappaB pathway, which depends on Tax phosphorylation, ubiquitination and sumoylation. We demonstrate that the nuclei of Tax-expressing cells, including HTLV-1 transformed T-lymphocytes, contain a pool of Tax molecules acetylated on lysine residue at amino acid position 346 by the transcriptional coactivator p300. Phosphorylation of Tax on serine residues 300/301 was a prerequisite for Tax localization in the nucleus and correlated with its subsequent acetylation by p300, whereas sumoylation, resulting in the formation of Tax nuclear bodies in which p300 was recruited, favored Tax acetylation. Overexpression of p300 markedly increased Tax acetylation and the ability of a wild type HTLV-1 provirus, but not of a mutant provirus carrying an acetylation deficient Tax gene, to activate gene expression from an integrated NF-kappaB-controlled promoter. Thus, Tax acetylation favors NF-kappaB activation and might play an important role in HTLV-1-induced cell transformation.
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Affiliation(s)
- Julie Lodewick
- Institute for Microbiological Research J-M Wiame and Laboratory of Microbiology, Université Libre de Bruxelles, 1, Avenue Emile Gryson, B-1070 Brussels, Belgium
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16
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Heuzé ML, Lamsoul I, Moog-Lutz C, Lutz PG. Ubiquitin-mediated proteasomal degradation in normal and malignant hematopoiesis. Blood Cells Mol Dis 2008; 40:200-10. [DOI: 10.1016/j.bcmd.2007.07.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2007] [Accepted: 07/11/2007] [Indexed: 01/10/2023]
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17
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Lamsoul I, Lodewick J, Lebrun S, Brasseur R, Burny A, Gaynor RB, Bex F. Exclusive ubiquitination and sumoylation on overlapping lysine residues mediate NF-kappaB activation by the human T-cell leukemia virus tax oncoprotein. Mol Cell Biol 2005; 25:10391-406. [PMID: 16287853 PMCID: PMC1291224 DOI: 10.1128/mcb.25.23.10391-10406.2005] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The transcription factor NF-kappaB is critical for the induction of cancer, including adult T-cell leukemia, which is linked to infection by human T-cell leukemia virus type 1 and the expression of its regulatory protein Tax. Although activation of the NF-kappaB pathway by Tax involves its interaction with the regulatory subunit of the IkappaB kinase (IKK) complex, NEMO/IKKgamma, the mechanism by which Tax activates specific cellular genes in the nucleus remains unknown. Here, we demonstrate that the attachment of SUMO-1 to Tax regulates its localization in nuclear bodies and the recruitment of both the RelA subunit of NF-kappaB and free IKKgamma in these nuclear structures. However, this sumoylation step is not sufficient for the activation of the NF-kappaB pathway by Tax. This activity requires the prior ubiquitination and colocalization of ubiquitinated Tax with IKK complexes in the cytoplasm and the subsequent migration of the RelA subunit of NF-kappaB to the nucleus. Thus, the ubiquitination and sumoylation of Tax function in concert to result in the migration of RelA to the nucleus and its accumulation with IKKgamma in nuclear bodies for activation of gene expression. These modifications may result in targets for the treatment of adult T-cell leukemia.
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Affiliation(s)
- Isabelle Lamsoul
- Institute for Microbiological Research J-M Wiame, 1 Avenue E. Gryson, B-1070 Brussels, Belgium
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18
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Chiari E, Lamsoul I, Lodewick J, Chopin C, Bex F, Pique C. Stable ubiquitination of human T-cell leukemia virus type 1 tax is required for proteasome binding. J Virol 2004; 78:11823-32. [PMID: 15479824 PMCID: PMC523289 DOI: 10.1128/jvi.78.21.11823-11832.2004] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Human T-cell leukemia virus type 1 (HTLV-1) is the retrovirus responsible for adult T-cell leukemia and HTLV-1-associated myelopathy. Adult T-cell leukemia development is mainly due to the ability of the viral oncoprotein Tax to promote T-cell proliferation, whereas the appearance of HTLV-1-associated myelopathy involves the antigenic properties of Tax. Understanding the events regulating the intracellular level of Tax is therefore an important issue. How Tax is degraded has not been determined, but it is known that Tax binds to proteasomes, the major sites for degradation of intracellular proteins, generally tagged through polyubiquitin conjugation. In this study, we investigated the relationship between Tax, ubiquitin, and proteasomes. We report that mono- and polyubiquitinated Tax proteins can be recovered from both transfected 293T cells and T lymphocytes. We also show that lysine residues located in the carboxy-terminal domain of Tax are the principal targets of this process. Remarkably, we further demonstrate that mutation of lysine residues in the C-terminal part of Tax, which massively reduces Tax ubiquitination, impairs proteasome binding, and conversely, that a Tax mutant that binds poorly to this particle (M22) is faintly ubiquitinated, suggesting that Tax ubiquitination is required for association with cellular proteasomes. Finally, we document that comparable amounts of ubiquitinated species were found whether proteasome activities were inhibited or not, providing evidence that they are not directly addressed to proteasomes for degradation. These findings indicate that although it is ubiquitinated and binds to proteasomes, Tax is not massively degraded via the ubiquitin-proteasome pathway and therefore reveal that Tax conjugation to ubiquitin mediates a nonproteolytic function.
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Affiliation(s)
- Estelle Chiari
- CNRS UPR 9051, Institut Universitaire d'Hématologie, Hôpital St Louis, 1 Avenue Claude Vellefaux, 75010 Paris, France
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19
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Quivy V, Calomme C, Dekoninck A, Demonte D, Bex F, Lamsoul I, Vanhulle C, Burny A, Van Lint C. Gene Activation and Gene Silencing: A Subtle Equilibrium. Cloning and Stem Cells 2004; 6:140-9. [PMID: 15268788 DOI: 10.1089/1536230041372454] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The genetic make-up of a cell resides entirely in its DNA. Now that the nucleotide sequence of several genomes has been determined, the major challenging problem is to understand how cell differentiation, proliferation or death are controlled. Major steps include analysis of the determinants of the cell cycle, the unravelling of RNAs and proteins involved in the control of gene expression and the dissection of the protein-destruction machinery. The successive steps to be considered are transcription of RNA on the DNA template, mRNA stabilization or degradation, and mRNA translation and protein localization in the right cell compartment. Gene expression or gene silencing is the result of many DNA-RNA-protein interactions and chromatin is among the key regulators of gene expression. Open chromatin (euchromatin) allows expression of the DNA message. This chromatin structure is generally characterized by the presence on the gene promoters of transcription complexes associated with histone acetyltransferases (HATs). On the contrary, closed chromatin (heterochromatin) is poorly acetylated and more condensed. It contains histone deacetylases (HDACs), potentially associated with DNA methyltransferases (DNMTs). DNMT activity leads to methylation and silencing of the DNA. Thus, a major problem in the field of gene regulation resides in understanding chromatin structure at each promoter, a formidable task for the years to come.
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Affiliation(s)
- Vincent Quivy
- Université Libre de Bruxelles, Institut de Biologie et de Médecine Moléculaires, Service de Chimie Biologique, Laboratoire de Virologie Moléculaire, Rue des Profs Jeener et Brachet 12, 6041 Gosselies, Belgium
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