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Hutin S, Kumita JR, Strotmann VI, Dolata A, Ling WL, Louafi N, Popov A, Milhiet PE, Blackledge M, Nanao MH, Wigge PA, Stahl Y, Costa L, Tully MD, Zubieta C. Phase separation and molecular ordering of the prion-like domain of the Arabidopsis thermosensory protein EARLY FLOWERING 3. Proc Natl Acad Sci U S A 2023; 120:e2304714120. [PMID: 37399408 PMCID: PMC10334799 DOI: 10.1073/pnas.2304714120] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 06/06/2023] [Indexed: 07/05/2023] Open
Abstract
Liquid-liquid phase separation (LLPS) is an important mechanism enabling the dynamic compartmentalization of macromolecules, including complex polymers such as proteins and nucleic acids, and occurs as a function of the physicochemical environment. In the model plant, Arabidopsis thaliana, LLPS by the protein EARLY FLOWERING3 (ELF3) occurs in a temperature-sensitive manner and controls thermoresponsive growth. ELF3 contains a largely unstructured prion-like domain (PrLD) that acts as a driver of LLPS in vivo and in vitro. The PrLD contains a poly-glutamine (polyQ) tract, whose length varies across natural Arabidopsis accessions. Here, we use a combination of biochemical, biophysical, and structural techniques to investigate the dilute and condensed phases of the ELF3 PrLD with varying polyQ lengths. We demonstrate that the dilute phase of the ELF3 PrLD forms a monodisperse higher-order oligomer that does not depend on the presence of the polyQ sequence. This species undergoes LLPS in a pH- and temperature-sensitive manner and the polyQ region of the protein tunes the initial stages of phase separation. The liquid phase rapidly undergoes aging and forms a hydrogel as shown by fluorescence and atomic force microscopies. Furthermore, we demonstrate that the hydrogel assumes a semiordered structure as determined by small-angle X-ray scattering, electron microscopy, and X-ray diffraction. These experiments demonstrate a rich structural landscape for a PrLD protein and provide a framework to describe the structural and biophysical properties of biomolecular condensates.
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Affiliation(s)
- Stephanie Hutin
- Laboratoire de Physiologie Cellulaire et Végétale, University Grenoble Alpes, Centre national de la recherche scientifique, Commissariat à l'énergie atomique et aux énergies alternatives, Institut national de recherche pour l’agriculture, l’alimentation et l’environnement, Institut de recherche interdisciplinaire de Grenoble, Grenoble38054, France
| | - Janet R. Kumita
- Department of Pharmacology, University of Cambridge, CambridgeCB2 1PD, United Kingdom
| | - Vivien I. Strotmann
- Institute for Developmental Genetics, Heinrich-Heine University, DüsseldorfD-40225, Germany
| | - Anika Dolata
- Institute for Developmental Genetics, Heinrich-Heine University, DüsseldorfD-40225, Germany
| | - Wai Li Ling
- University Grenoble Alpes, Commissariat à l'énergie atomique et aux énergies alternatives, Centre national de la recherche scientifique, Institut de Biologie Structurale, Institut de recherche interdisciplinaire de Grenoble, Grenoble38000, France
| | - Nessim Louafi
- Centre de Biologie Structurale, University Montpellier, Centre national de la recherche scientifique, Institut national de la santé et de la recherche médicale, Montpellier34090, France
| | - Anton Popov
- European Synchrotron Radiation Facility, Structural Biology Group, Grenoble38000, France
| | - Pierre-Emmanuel Milhiet
- Centre de Biologie Structurale, University Montpellier, Centre national de la recherche scientifique, Institut national de la santé et de la recherche médicale, Montpellier34090, France
| | - Martin Blackledge
- University Grenoble Alpes, Commissariat à l'énergie atomique et aux énergies alternatives, Centre national de la recherche scientifique, Institut de Biologie Structurale, Institut de recherche interdisciplinaire de Grenoble, Grenoble38000, France
| | - Max H. Nanao
- European Synchrotron Radiation Facility, Structural Biology Group, Grenoble38000, France
| | - Philip A. Wigge
- Leibniz-Institut für Gemüse- und Zierpflanzenbau, 14979Grossbeeren, Germany
- Institute of Biochemistry and Biology, University of Potsdam, 14476Potsdam, Germany
| | - Yvonne Stahl
- Institute for Developmental Genetics, Heinrich-Heine University, DüsseldorfD-40225, Germany
- Cluster of Excellence on Plant Sciences, Heinrich-Heine University, DüsseldorfD-40225, Germany
| | - Luca Costa
- Centre de Biologie Structurale, University Montpellier, Centre national de la recherche scientifique, Institut national de la santé et de la recherche médicale, Montpellier34090, France
| | - Mark D. Tully
- European Synchrotron Radiation Facility, Structural Biology Group, Grenoble38000, France
| | - Chloe Zubieta
- Laboratoire de Physiologie Cellulaire et Végétale, University Grenoble Alpes, Centre national de la recherche scientifique, Commissariat à l'énergie atomique et aux énergies alternatives, Institut national de recherche pour l’agriculture, l’alimentation et l’environnement, Institut de recherche interdisciplinaire de Grenoble, Grenoble38054, France
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Schatz M, Marty L, Ounadjela C, Tong PBV, Cardace I, Mettling C, Milhiet PE, Costa L, Godefroy C, Pugnière M, Guichou JF, Mesnard JM, Blaise M, Beaumelle B. A Tripartite Complex HIV-1 Tat-Cyclophilin A-Capsid Protein Enables Tat Encapsidation That Is Required for HIV-1 Infectivity. J Virol 2023; 97:e0027823. [PMID: 37129415 PMCID: PMC10134889 DOI: 10.1128/jvi.00278-23] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 03/21/2023] [Indexed: 05/03/2023] Open
Abstract
HIV-1 Tat is a key viral protein that stimulates several steps of viral gene expression. Tat is especially required for the transcription of viral genes. Nevertheless, it is still not clear if and how Tat is incorporated into HIV-1 virions. Cyclophilin A (CypA) is a prolyl isomerase that binds to HIV-1 capsid protein (CA) and is thereby encapsidated at the level of 200 to 250 copies of CypA/virion. Here, we found that a Tat-CypA-CA tripartite complex assembles in HIV-1-infected cells and allows Tat encapsidation into HIV virions (1 Tat/1 CypA). Biochemical and biophysical studies showed that high-affinity interactions drive the assembly of the Tat-CypA-CA complex that could be purified by size exclusion chromatography. We prepared different types of viruses devoid of transcriptionally active Tat. They showed a 5- to 10 fold decrease in HIV infectivity, and conversely, encapsidating Tat into ΔTat viruses greatly enhanced infectivity. The absence of encapsidated Tat decreased the efficiency of reverse transcription by ~50% and transcription by more than 90%. We thus identified a Tat-CypA-CA complex that enables Tat encapsidation and showed that encapsidated Tat is required to initiate robust viral transcription and thus viral production at the beginning of cell infection, before neosynthesized Tat becomes available. IMPORTANCE The viral transactivating protein Tat has been shown to stimulate several steps of HIV gene expression. It was found to facilitate reverse transcription. Moreover, Tat is strictly required for the transcription of viral genes. Although the presence of Tat within HIV virions would undoubtedly favor these steps and therefore enable the incoming virus to boost initial viral production, whether and how Tat is present within virions has been a matter a debate. We here described and characterized a tripartite complex between Tat, HIV capsid protein, and the cellular chaperone cyclophilin A that enables efficient and specific Tat encapsidation within HIV virions. We further showed that Tat encapsidation is required for the virus to efficiently initiate infection and viral production. This effect is mainly due to the transcriptional activity of Tat.
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Affiliation(s)
- Malvina Schatz
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004 CNRS, Université de Montpellier, Montpellier, France
| | - Laetitia Marty
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004 CNRS, Université de Montpellier, Montpellier, France
| | - Camille Ounadjela
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004 CNRS, Université de Montpellier, Montpellier, France
| | - Phuoc Bao Viet Tong
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004 CNRS, Université de Montpellier, Montpellier, France
| | - Ilaria Cardace
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004 CNRS, Université de Montpellier, Montpellier, France
| | - Clément Mettling
- Institut de Génétique Humaine, UPR 1142 CNRS, Montpellier, France
| | - Pierre-Emmanuel Milhiet
- Centre de Biologie Structurale, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Luca Costa
- Centre de Biologie Structurale, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Cédric Godefroy
- Centre de Biologie Structurale, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Martine Pugnière
- Institut de Recherche en Cancérologie de Montpellier, INSERM U 1194, Montpellier, France
| | - Jean-François Guichou
- Centre de Biologie Structurale, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Jean-Michel Mesnard
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004 CNRS, Université de Montpellier, Montpellier, France
| | - Mickaël Blaise
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004 CNRS, Université de Montpellier, Montpellier, France
| | - Bruno Beaumelle
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004 CNRS, Université de Montpellier, Montpellier, France
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3
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Vial A, Costa L, Dosset P, Rosso P, Boutières G, Faklaris O, Haschke H, Milhiet PE, Doucet CM. Structure and mechanics of the human nuclear pore complex basket using correlative AFM-fluorescence superresolution microscopy. Nanoscale 2023; 15:5756-5770. [PMID: 36786384 DOI: 10.1039/d2nr06034e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Nuclear pore complexes (NPCs) are the only gateways between the nucleus and cytoplasm in eukaryotic cells. They restrict free diffusion to molecules below 5 nm while facilitating the active transport of selected cargoes, sometimes as large as the pore itself. This versatility implies an important pore plasticity. Recently, cryo-EM and AI-based protein modeling of human NPC revealed with acute precision how most constituents are arranged. But the basket, a fish trap-like structure capping the nucleoplasmic side of the pore, remains poorly resolved. Here by atomic force microscopy (AFM) coupled to single molecule localization microscopy (SMLM) we revealed that the basket is very soft and explores a large conformational landscape: apart from its canonical basket shape, it dives into the central pore channel or opens, with filaments reaching to the pore sides. Our observations highlight how this structure can adapt and let morphologically diverse cargoes shuttle through NPCs.
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Affiliation(s)
- Anthony Vial
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Luca Costa
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Patrice Dosset
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Pietro Rosso
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Gaëlle Boutières
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Orestis Faklaris
- MRI, Biocampus, University of Montpellier, CNRS, INSERM, Montpellier, France
| | | | | | - Christine M Doucet
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
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Elena-Real CA, Sagar A, Urbanek A, Popovic M, Morató A, Estaña A, Fournet A, Doucet C, Lund XL, Shi ZD, Costa L, Thureau A, Allemand F, Swenson RE, Milhiet PE, Crehuet R, Barducci A, Cortés J, Sinnaeve D, Sibille N, Bernadó P. The structure of pathogenic huntingtin exon 1 defines the bases of its aggregation propensity. Nat Struct Mol Biol 2023; 30:309-320. [PMID: 36864173 DOI: 10.1038/s41594-023-00920-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 01/05/2023] [Indexed: 03/04/2023]
Abstract
Huntington's disease is a neurodegenerative disorder caused by a CAG expansion in the first exon of the HTT gene, resulting in an extended polyglutamine (poly-Q) tract in huntingtin (httex1). The structural changes occurring to the poly-Q when increasing its length remain poorly understood due to its intrinsic flexibility and the strong compositional bias. The systematic application of site-specific isotopic labeling has enabled residue-specific NMR investigations of the poly-Q tract of pathogenic httex1 variants with 46 and 66 consecutive glutamines. Integrative data analysis reveals that the poly-Q tract adopts long α-helical conformations propagated and stabilized by glutamine side chain to backbone hydrogen bonds. We show that α-helical stability is a stronger signature in defining aggregation kinetics and the structure of the resulting fibrils than the number of glutamines. Our observations provide a structural perspective of the pathogenicity of expanded httex1 and pave the way to a deeper understanding of poly-Q-related diseases.
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Affiliation(s)
- Carlos A Elena-Real
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Amin Sagar
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Annika Urbanek
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Matija Popovic
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Anna Morató
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Alejandro Estaña
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
- LAAS-CNRS, University of Toulouse, CNRS, Toulouse, France
| | - Aurélie Fournet
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Christine Doucet
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Xamuel L Lund
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
- Institute of Laue Langevin, Grenoble, France
| | - Zhen-Dan Shi
- The Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, USA
| | - Luca Costa
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | | | - Frédéric Allemand
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Rolf E Swenson
- The Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, USA
| | | | - Ramon Crehuet
- Institute for Advanced Chemistry of Catalonia (IQAC), CSIC, Barcelona, Spain
| | - Alessandro Barducci
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Juan Cortés
- LAAS-CNRS, University of Toulouse, CNRS, Toulouse, France
| | - Davy Sinnaeve
- Univ. Lille, INSERM, CHU Lille, Institut Pasteur de Lille, U1167 - RID-AGE - Risk Factors and Molecular Determinants of Aging-Related Diseases, Lille, France
- CNRS, EMR9002, Integrative Structural Biology, Lille, France
| | - Nathalie Sibille
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Pau Bernadó
- Centre for Structural Biology, University of Montpellier, INSERM, CNRS, Montpellier, France.
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5
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Vial A, Taveneau C, Costa L, Chauvin B, Nasrallah H, Godefroy C, Dosset P, Isambert H, Ngo KX, Mangenot S, Levy D, Bertin A, Milhiet PE. Correlative AFM and fluorescence imaging demonstrate nanoscale membrane remodeling and ring-like and tubular structure formation by septins. Nanoscale 2021; 13:12484-12493. [PMID: 34225356 DOI: 10.1039/d1nr01978c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Septins are ubiquitous cytoskeletal filaments that interact with the inner plasma membrane and are essential for cell division in eukaryotes. In cellular contexts, septins are often localized at micrometric Gaussian curvatures, where they assemble onto ring-like structures. The behavior of budding yeast septins depends on their specific interaction with inositol phospholipids, enriched at the inner leaflet of the plasma membrane. Septin filaments are built from the non-polar self-assembly of short rods into filaments. However, the molecular mechanisms regulating the interplay with the inner plasma membrane and the resulting interaction with specific curvatures are not fully understood. In this report, we have imaged dynamical molecular assemblies of budding yeast septins on PIP2-containing supported lipid bilayers using a combination of high-speed AFM and correlative AFM-fluorescence microscopy. Our results clearly demonstrate that septins are able to bind to flat supported lipid bilayers and thereafter induce the remodeling of membranes. Short septin rods (octamers subunits) can indeed destabilize supported lipid bilayers and reshape the membrane to form 3D structures such as rings and tubes, demonstrating that long filaments are not necessary for septin-induced membrane buckling.
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Affiliation(s)
- Anthony Vial
- Centre de Biochimie Structurale (CBS), Université de Montpellier, CNRS, INSERM, 34090 Montpellier, France.
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Ngo G, Félix G, Dorandeu C, Devoisselle JM, Costa L, Milhiet PE, Guari Y, Larionova J, Chopineau J. A Novel Approach to the Facile Growth and Organization of Photothermal Prussian Blue Nanocrystals on Different Surfaces. Nanomaterials (Basel) 2021; 11:1749. [PMID: 34361135 PMCID: PMC8308188 DOI: 10.3390/nano11071749] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 06/24/2021] [Accepted: 06/27/2021] [Indexed: 01/16/2023]
Abstract
We report here a novel "one-pot" approach for the controlled growth and organization of Prussian blue nanostructures on three different surfaces: pure Au0, cysteamine-functionalized Au0, and SiO2-supported lipid bilayers with different natures of lipids. We demonstrate that fine control over the size, morphology, and the degree and homogeneity of the surface coverage by Prussian Blue (PB) nanostructures may be achieved by manipulating different parameters, which are the precursor concentration, the nature of the functional groups or the nature of lipids on the surfaces. This allows the growth of isolated PB nanopyramids and nanocubes or the design of thin dense films over centimeter square surfaces. The formation of unusual Prussian blue nanopyramids is discussed. Finally, we demonstrate, by using experimental techniques and theoretical modeling, that PB nanoparticles deposited on the gold surface exhibit strong photothermal properties, permitting a rapid temperature increase up to 90 °C with a conversion of the laser power of almost 50% for power source heat.
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Affiliation(s)
- Giang Ngo
- ICGM, Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France; (G.N.); (C.D.); (J.-M.D.); (J.L.)
| | - Gautier Félix
- ICGM, Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France; (G.N.); (C.D.); (J.-M.D.); (J.L.)
| | - Christophe Dorandeu
- ICGM, Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France; (G.N.); (C.D.); (J.-M.D.); (J.L.)
| | - Jean-Marie Devoisselle
- ICGM, Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France; (G.N.); (C.D.); (J.-M.D.); (J.L.)
| | - Luca Costa
- CBS, Univ Montpellier, CNRS, INSERM, 34090 Montpellier, France; (L.C.); (P.-E.M.)
| | | | - Yannick Guari
- ICGM, Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France; (G.N.); (C.D.); (J.-M.D.); (J.L.)
| | - Joulia Larionova
- ICGM, Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France; (G.N.); (C.D.); (J.-M.D.); (J.L.)
| | - Joël Chopineau
- ICGM, Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France; (G.N.); (C.D.); (J.-M.D.); (J.L.)
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Ordas L, Costa L, Lozano A, Chevillard C, Calovoulos A, Kantar D, Fernandez L, Chauvin L, Dosset P, Doucet C, Heron-Milhavet L, Odintsova E, Berditchevski F, Milhiet PE, Bénistant C. Mechanical Control of Cell Migration by the Metastasis Suppressor Tetraspanin CD82/KAI1. Cells 2021; 10:cells10061545. [PMID: 34207462 PMCID: PMC8234748 DOI: 10.3390/cells10061545] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/10/2021] [Accepted: 06/15/2021] [Indexed: 01/16/2023] Open
Abstract
The plasma membrane is a key actor of cell migration. For instance, its tension controls persistent cell migration and cell surface caveolae integrity. Then, caveolae constituents such as caveolin-1 can initiate a mechanotransduction loop that involves actin- and focal adhesion-dependent control of the mechanosensor YAP to finely tune cell migration. Tetraspanin CD82 (also named KAI-1) is an integral membrane protein and a metastasis suppressor. Its expression is lost in many cancers including breast cancer. It is a strong inhibitor of cell migration by a little-known mechanism. We demonstrated here that CD82 controls persistent 2D migration of EGF-induced single cells, stress fibers and focal adhesion sizes and dynamics. Mechanistically, we found that CD82 regulates membrane tension, cell surface caveolae abundance and YAP nuclear translocation in a caveolin-1-dependent manner. Altogether, our data show that CD82 controls 2D cell migration using membrane-driven mechanics involving caveolin and the YAP pathway.
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Affiliation(s)
- Laura Ordas
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
| | - Luca Costa
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
| | - Anthony Lozano
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
- Institut de Génétique Moléculaire de Montpellier, University Montpellier, CNRS, 34293 Montpellier, France
| | - Christopher Chevillard
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
| | - Alexia Calovoulos
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
| | - Diala Kantar
- Institut de Recherche en Cancérologie de Montpellier (IRCM), Inserm U1194—University Montpellier—Institut Régional du Cancer de Montpellier (ICM), 34298 Montpellier, France; (D.K.); (L.H.-M.)
| | - Laurent Fernandez
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
- European Institute of Chemistry and Biology (IECB), University of Bordeaux, 33607 Pessac, France
| | - Lucie Chauvin
- Centre de Recherche de Biologie Cellulaire de Montpellier (CRBM), CNRS UMR 5237, University Montpellier, 34293 Montpellier, France;
| | - Patrice Dosset
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
| | - Christine Doucet
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
| | - Lisa Heron-Milhavet
- Institut de Recherche en Cancérologie de Montpellier (IRCM), Inserm U1194—University Montpellier—Institut Régional du Cancer de Montpellier (ICM), 34298 Montpellier, France; (D.K.); (L.H.-M.)
| | - Elena Odintsova
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; (E.O.); (F.B.)
| | - Fedor Berditchevski
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; (E.O.); (F.B.)
| | - Pierre-Emmanuel Milhiet
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
- Correspondence: (P.-E.M.); (C.B.)
| | - Christine Bénistant
- Centre de Biologie Structurale (CBS), CNRS, INSERM, University Montpellier, 34090 Montpellier, France; (L.O.); (L.C.); (A.L.); (C.C.); (A.C.); (L.F.); (P.D.); (C.D.)
- Correspondence: (P.-E.M.); (C.B.)
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8
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Bada Juarez JF, Judge PJ, Adam S, Axford D, Vinals J, Birch J, Kwan TOC, Hoi KK, Yen HY, Vial A, Milhiet PE, Robinson CV, Schapiro I, Moraes I, Watts A. Structures of the archaerhodopsin-3 transporter reveal that disordering of internal water networks underpins receptor sensitization. Nat Commun 2021; 12:629. [PMID: 33504778 PMCID: PMC7840839 DOI: 10.1038/s41467-020-20596-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 12/10/2020] [Indexed: 12/11/2022] Open
Abstract
Many transmembrane receptors have a desensitized state, in which they are unable to respond to external stimuli. The family of microbial rhodopsin proteins includes one such group of receptors, whose inactive or dark-adapted (DA) state is established in the prolonged absence of light. Here, we present high-resolution crystal structures of the ground (light-adapted) and DA states of Archaerhodopsin-3 (AR3), solved to 1.1 Å and 1.3 Å resolution respectively. We observe significant differences between the two states in the dynamics of water molecules that are coupled via H-bonds to the retinal Schiff Base. Supporting QM/MM calculations reveal how the DA state permits a thermodynamic equilibrium between retinal isomers to be established, and how this same change is prevented in the ground state in the absence of light. We suggest that the different arrangement of internal water networks in AR3 is responsible for the faster photocycle kinetics compared to homologs.
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Affiliation(s)
- Juan F Bada Juarez
- Biochemistry Department, Oxford University, South Parks Road, Oxford, OX1 3QU, UK
| | - Peter J Judge
- Biochemistry Department, Oxford University, South Parks Road, Oxford, OX1 3QU, UK
| | - Suliman Adam
- Fritz Haber Center for Molecular Dynamics Research, Institute of Chemistry, Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
| | - Danny Axford
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
| | - Javier Vinals
- Biochemistry Department, Oxford University, South Parks Road, Oxford, OX1 3QU, UK
| | - James Birch
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
- Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, OX11 0FA, UK
| | - Tristan O C Kwan
- Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, OX11 0FA, UK
- National Physical Laboratory, Hampton Road, Teddington, London, TW11 0LW, UK
| | - Kin Kuan Hoi
- Chemistry Research Laboratory, Oxford University, Mansfield Road, Oxford, OX1 3TA, UK
| | - Hsin-Yung Yen
- OMass Therapeutics, The Schrodinger Building, Oxford Science Park, Oxford, OX4 4GE, UK
| | - Anthony Vial
- Centre de Biochimie Structurale (CBS), INSERM, CNRS, University of Montpellier, Montpellier, France
| | - Pierre-Emmanuel Milhiet
- Centre de Biochimie Structurale (CBS), INSERM, CNRS, University of Montpellier, Montpellier, France
| | - Carol V Robinson
- Chemistry Research Laboratory, Oxford University, Mansfield Road, Oxford, OX1 3TA, UK
| | - Igor Schapiro
- Fritz Haber Center for Molecular Dynamics Research, Institute of Chemistry, Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
| | - Isabel Moraes
- Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, OX11 0FA, UK.
- National Physical Laboratory, Hampton Road, Teddington, London, TW11 0LW, UK.
| | - Anthony Watts
- Biochemistry Department, Oxford University, South Parks Road, Oxford, OX1 3QU, UK.
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9
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Saavedra V O, Fernandes TFD, Milhiet PE, Costa L. Compression, Rupture, and Puncture of Model Membranes at the Molecular Scale. Langmuir 2020; 36:5709-5716. [PMID: 32427478 DOI: 10.1021/acs.langmuir.0c00247] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Elastic properties of biological membranes are involved in a large number of membrane functionalities and activities. Conventionally characterized in terms of Young's modulus, bending stiffness and stretching modulus, membrane mechanics can be assessed at high lateral resolution by means of atomic force microscopy (AFM). Here we show that the mechanical response of biomimetic model systems such as supported lipid bilayers (SLBs) is highly affected by the size of the AFM tip employed as a membrane indenter. Our study is focused on phase-separated fluid-gel lipid membranes at room temperature. In a small tip radius regime (≈ 2 nm) and in the case of fluid phase membranes, we show that the tip can penetrate through the membrane minimizing molecular vertical compression and in absence of molecular membrane rupture. In this case, AFM indentation experiments cannot assess the vertical membrane Young's modulus. In agreement with the data reported in the literature, in the case of larger indenters (>2 nm) SLBs can be compressed leading to an evaluation of Young's modulus and membrane maximal withstanding force before rupture. We show that such force increases with the indenter in agreement with the existing theoretical frame. Finally, we demonstrate that the latter has no influence on the number of molecules involved in the rupture process that is observed to be constant and rather dependent on the indenter chemical composition.
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Affiliation(s)
- Oscar Saavedra V
- Centre de Biochimie Structurale (CBS), CNRS, INSERM, Univ. Montpellier, 34090 Montpellier, France
| | - Thales F D Fernandes
- Centre de Biochimie Structurale (CBS), CNRS, INSERM, Univ. Montpellier, 34090 Montpellier, France
| | - Pierre-Emmanuel Milhiet
- Centre de Biochimie Structurale (CBS), CNRS, INSERM, Univ. Montpellier, 34090 Montpellier, France
| | - Luca Costa
- Centre de Biochimie Structurale (CBS), CNRS, INSERM, Univ. Montpellier, 34090 Montpellier, France
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10
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Dahmane S, Doucet C, Le Gall A, Chamontin C, Dosset P, Murcy F, Fernandez L, Salas D, Rubinstein E, Mougel M, Nollmann M, Milhiet PE. Nanoscale organization of tetraspanins during HIV-1 budding by correlative dSTORM/AFM. Nanoscale 2019; 11:6036-6044. [PMID: 30869094 DOI: 10.1039/c8nr07269h] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Membrane partition and remodeling play a key role in numerous cell mechanisms, especially in viral replication cycles where viruses subvert the plasma membrane to enter and escape from the host cell. Specifically assembly and release of HIV-1 particles require specific cellular components, which are recruited to the egress site by the viral protein Gag. We previously demonstrated that HIV-1 assembly alters both partitioning and dynamics of the tetraspanins CD9 and CD81, which are key players in many infectious processes, forming enriched areas where the virus buds. In this study we correlated super resolution microscopy mapping of tetraspanins with membrane topography delineated by atomic force microscopy (AFM) in Gag-expressing cells. We revealed that CD9 is specifically trapped within the nascent viral particles, especially at buds tips, suggesting that Gag mediates CD9 and CD81 depletion from the plasma membrane. In addition, we showed that CD9 is organized as small membrane assemblies of few tens of nanometers that can coalesce upon Gag expression.
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Affiliation(s)
- Selma Dahmane
- Centre de Biochimie Structurale (CBS), INSERM, CNRS, Univ Montpellier, France.
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11
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Theodoratou A, Costa L, Bonnet L, Blanc C, Lapinte V, Etienne P, Milhiet PE, Robin JJ, Oberdisse J, Chopineau J, Aubert-Pouëssel A. Physico-chemical properties and surface characterization of renewable hybrid nanofilms interacting with model proteins. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.12.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Nasrallah H, Vial A, Pocholle N, Soulier J, Costa L, Godefroy C, Bourillot E, Lesniewska E, Milhiet PE. Imaging Artificial Membranes Using High-Speed Atomic Force Microscopy. Methods Mol Biol 2019; 1886:45-59. [PMID: 30374861 DOI: 10.1007/978-1-4939-8894-5_3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Supported lipid bilayers represent a very attractive way to mimic biological membranes, especially to investigate molecular mechanisms associated with the lateral segregation of membrane components. Observation of these model membranes with high-speed atomic force microscopy (HS-AFM) allows the capture of both topography and dynamics of membrane components, with a spatial resolution in the nanometer range and image capture time of less than 1 s. In this context, we have developed new protocols adapted for HS-AFM to form supported lipid bilayers on small mica disks using the vesicle fusion or Langmuir-Blodgett methods. In this chapter we describe in detail the protocols to fabricate supported artificial bilayers as well as the main guidelines for HS-AFM imaging of such samples.
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Affiliation(s)
- Hussein Nasrallah
- INSERM, U1054, Montpellier, France
- Centre de Biochimie Structurale, Université de Montpellier, CNRS, UMR 5048, Montpellier, France
| | - Anthony Vial
- INSERM, U1054, Montpellier, France
- Centre de Biochimie Structurale, Université de Montpellier, CNRS, UMR 5048, Montpellier, France
| | - Nicolas Pocholle
- ICB UMR CNRS 6303, University of Bourgogne Franche-Comte, Dijon, France
| | - Jérémy Soulier
- INSERM, U1054, Montpellier, France
- Centre de Biochimie Structurale, Université de Montpellier, CNRS, UMR 5048, Montpellier, France
| | - Luca Costa
- INSERM, U1054, Montpellier, France
- Centre de Biochimie Structurale, Université de Montpellier, CNRS, UMR 5048, Montpellier, France
| | - Cédric Godefroy
- INSERM, U1054, Montpellier, France
- Centre de Biochimie Structurale, Université de Montpellier, CNRS, UMR 5048, Montpellier, France
| | - Eric Bourillot
- ICB UMR CNRS 6303, University of Bourgogne Franche-Comte, Dijon, France
| | - Eric Lesniewska
- ICB UMR CNRS 6303, University of Bourgogne Franche-Comte, Dijon, France
| | - Pierre-Emmanuel Milhiet
- INSERM, U1054, Montpellier, France.
- Centre de Biochimie Structurale, Université de Montpellier, CNRS, UMR 5048, Montpellier, France.
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13
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Ngo G, Félix G, Long J, Costa L, Saavedra V. O, Milhiet PE, Devoisselle JM, Guari Y, Larionova J, Chopineau J. A simple approach for controlled deposition of Prussian blue analogue nanoparticles on a functionalised plasmonic gold surface. NEW J CHEM 2019. [DOI: 10.1039/c9nj00251k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Surface plasmon resonance monitoring of Prussian blue analogue nanoparticles anchored on a gold-cysteamine substrate.
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Affiliation(s)
- Giang Ngo
- Institut Charles Gerhardt Montpellier (ICGM), Univ Montpellier, ENSCM, CNRS, Montpellier
- France
| | - Gautier Félix
- Institut Charles Gerhardt Montpellier (ICGM), Univ Montpellier, ENSCM, CNRS, Montpellier
- France
| | - Jérôme Long
- Institut Charles Gerhardt Montpellier (ICGM), Univ Montpellier, ENSCM, CNRS, Montpellier
- France
| | - Luca Costa
- Centre de Biochimie Structurale (CBS), CNRS, INSERM, Univ Montpellier
- France
| | - Oscar Saavedra V.
- Centre de Biochimie Structurale (CBS), CNRS, INSERM, Univ Montpellier
- France
| | | | - Jean-Marie Devoisselle
- Institut Charles Gerhardt Montpellier (ICGM), Univ Montpellier, ENSCM, CNRS, Montpellier
- France
| | - Yannick Guari
- Institut Charles Gerhardt Montpellier (ICGM), Univ Montpellier, ENSCM, CNRS, Montpellier
- France
| | - Joulia Larionova
- Institut Charles Gerhardt Montpellier (ICGM), Univ Montpellier, ENSCM, CNRS, Montpellier
- France
| | - Joël Chopineau
- Institut Charles Gerhardt Montpellier (ICGM), Univ Montpellier, ENSCM, CNRS, Montpellier
- France
- Université de Nîmes Rue Georges Salan 30000 Nîmes
- France
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14
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Gumí-Audenis B, Costa L, Redondo-Morata L, Milhiet PE, Sanz F, Felici R, Giannotti MI, Carlà F. In-plane molecular organization of hydrated single lipid bilayers: DPPC:cholesterol. Nanoscale 2017; 10:87-92. [PMID: 29210438 DOI: 10.1039/c7nr07510c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Understanding the physical properties of cholesterol-phospholipid systems is essential to gain a better knowledge of the function of each membrane constituent. We present a novel, simple and user-friendly setup that allows for the straightforward grazing incidence X-ray diffraction characterization of hydrated individual supported lipid bilayers. This configuration minimizes the scattering from the liquid and allows the detection of the extremely weak diffracted signal of the membrane, enabling the differentiation of the coexisting domains in DPPC:cholesterol single bilayers.
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15
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Haining EJ, Matthews AL, Noy PJ, Romanska HM, Harris HJ, Pike J, Morowski M, Gavin RL, Yang J, Milhiet PE, Berditchevski F, Nieswandt B, Poulter NS, Watson SP, Tomlinson MG. Tetraspanin Tspan9 regulates platelet collagen receptor GPVI lateral diffusion and activation. Platelets 2017; 28:629-642. [PMID: 28032533 PMCID: PMC5706974 DOI: 10.1080/09537104.2016.1254175] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 10/06/2016] [Accepted: 10/20/2016] [Indexed: 12/14/2022]
Abstract
The tetraspanins are a superfamily of four-transmembrane proteins, which regulate the trafficking, lateral diffusion and clustering of the transmembrane proteins with which they interact. We have previously shown that tetraspanin Tspan9 is expressed on platelets. Here we have characterised gene-trap mice lacking Tspan9. The mice were viable with normal platelet numbers and size. Tspan9-deficient platelets were specifically defective in aggregation and secretion induced by the platelet collagen receptor GPVI, despite normal surface GPVI expression levels. A GPVI activation defect was suggested by partially impaired GPVI-induced protein tyrosine phosphorylation. In mechanistic experiments, Tspan9 and GPVI co-immunoprecipitated and co-localised, but super-resolution imaging revealed no defects in collagen-induced GPVI clustering on Tspan9-deficient platelets. However, single particle tracking using total internal reflection fluorescence microscopy showed that GPVI lateral diffusion was reduced by approximately 50% in the absence of Tspan9. Therefore, Tspan9 plays a fine-tuning role in platelet activation by regulating GPVI membrane dynamics.
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Affiliation(s)
- Elizabeth J. Haining
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Alexandra L. Matthews
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Peter J. Noy
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | | | - Helen J. Harris
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Jeremy Pike
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
- PSIBS Doctoral Training Centre, School of Chemistry, University of Birmingham, Birmingham, UK
| | - Martina Morowski
- Department of Experimental Biomedicine, University Hospital, University of Würzburg, Würzburg, Germany
| | - Rebecca L. Gavin
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Jing Yang
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Pierre-Emmanuel Milhiet
- INSERM U1054, CNRS, UMR 5048, Centre de Biochimie Structurale, Montpellier University, France
| | - Fedor Berditchevski
- Institute of Cancer and Genomic Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Bernhard Nieswandt
- Department of Experimental Biomedicine, University Hospital, University of Würzburg, Würzburg, Germany
| | - Natalie S. Poulter
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Steve P. Watson
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Michael G. Tomlinson
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
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16
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Dosset P, Rassam P, Fernandez L, Espenel C, Rubinstein E, Margeat E, Milhiet PE. Automatic detection of diffusion modes within biological membranes using back-propagation neural network. BMC Bioinformatics 2016; 17:197. [PMID: 27141816 PMCID: PMC4855490 DOI: 10.1186/s12859-016-1064-z] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [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: 09/14/2015] [Accepted: 04/29/2016] [Indexed: 12/17/2022] Open
Abstract
Background Single particle tracking (SPT) is nowadays one of the most popular technique to probe spatio-temporal dynamics of proteins diffusing within the plasma membrane. Indeed membrane components of eukaryotic cells are very dynamic molecules and can diffuse according to different motion modes. Trajectories are often reconstructed frame-by-frame and dynamic properties often evaluated using mean square displacement (MSD) analysis. However, to get statistically significant results in tracking experiments, analysis of a large number of trajectories is required and new methods facilitating this analysis are still needed. Results In this study we developed a new algorithm based on back-propagation neural network (BPNN) and MSD analysis using a sliding window. The neural network was trained and cross validated with short synthetic trajectories. For simulated and experimental data, the algorithm was shown to accurately discriminate between Brownian, confined and directed diffusion modes within one trajectory, the 3 main of diffusion encountered for proteins diffusing within biological membranes. It does not require a minimum number of observed particle displacements within the trajectory to infer the presence of multiple motion states. The size of the sliding window was small enough to measure local behavior and to detect switches between different diffusion modes for segments as short as 20 frames. It also provides quantitative information from each segment of these trajectories. Besides its ability to detect switches between 3 modes of diffusion, this algorithm is able to analyze simultaneously hundreds of trajectories with a short computational time. Conclusion This new algorithm, implemented in powerful and handy software, provides a new conceptual and versatile tool, to accurately analyze the dynamic behavior of membrane components. Electronic supplementary material The online version of this article (doi:10.1186/s12859-016-1064-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Patrice Dosset
- Inserm, U1054, Montpellier, France.,Université de Montpellier, CNRS, UMR 5048, Centre de Biochimie Structurale, Montpellier, France
| | - Patrice Rassam
- Inserm, U1054, Montpellier, France.,Université de Montpellier, CNRS, UMR 5048, Centre de Biochimie Structurale, Montpellier, France
| | - Laurent Fernandez
- Inserm, U1054, Montpellier, France.,Université de Montpellier, CNRS, UMR 5048, Centre de Biochimie Structurale, Montpellier, France
| | - Cedric Espenel
- Department of Cell and Developmental Biology, Weill Cornell Medical College of Cornell University, New York, NY, USA
| | - Eric Rubinstein
- Inserm, U1004, Villejuif, France.,Institut André Lwoff, Université Paris 11, Villejuif, France
| | - Emmanuel Margeat
- Inserm, U1054, Montpellier, France.,Université de Montpellier, CNRS, UMR 5048, Centre de Biochimie Structurale, Montpellier, France
| | - Pierre-Emmanuel Milhiet
- Inserm, U1054, Montpellier, France. .,Université de Montpellier, CNRS, UMR 5048, Centre de Biochimie Structurale, Montpellier, France. .,Centre de Biochimie Structurale, 29, rue de Navacelles, 34090, Montpellier, France.
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17
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Chevalier C, Collin G, Descamps S, Touaitahuata H, Simon V, Reymond N, Fernandez L, Milhiet PE, Georget V, Urbach S, Lasorsa L, Orsetti B, Boissière-Michot F, Lopez-Crapez E, Theillet C, Roche S, Benistant C. TOM1L1 drives membrane delivery of MT1-MMP to promote ERBB2-induced breast cancer cell invasion. Nat Commun 2016; 7:10765. [PMID: 26899482 PMCID: PMC4764922 DOI: 10.1038/ncomms10765] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [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: 03/03/2015] [Accepted: 01/19/2016] [Indexed: 02/06/2023] Open
Abstract
ERBB2 overexpression in human breast cancer leads to invasive carcinoma but the mechanism is not clearly understood. Here we report that TOM1L1 is co-amplified with ERBB2 and defines a subgroup of HER2+/ER+ tumours with early metastatic relapse. TOM1L1 encodes a GAT domain-containing trafficking protein and is a SRC substrate that negatively regulates tyrosine kinase signalling. We demonstrate that TOM1L1 upregulation enhances the invasiveness of ERBB2-transformed cells. This pro-tumoural function does not involve SRC, but implicates membrane-bound membrane-type 1 MMP (MT1-MMP)-dependent activation of invadopodia, membrane protrusions specialized in extracellular matrix degradation. Mechanistically, ERBB2 elicits the indirect phosphorylation of TOM1L1 on Ser321. The phosphorylation event promotes GAT-dependent association of TOM1L1 with the sorting protein TOLLIP and trafficking of the metalloprotease MT1-MMP from endocytic compartments to invadopodia for tumour cell invasion. Collectively, these results show that TOM1L1 is an important element of an ERBB2-driven proteolytic invasive programme and that TOM1L1 amplification potentially enhances the metastatic progression of ERBB2-positive breast cancers. ERBB2 overexpression in human breast cancer leads to invasion and metastasis. Here the authors report that ERBB2 induces indirect phosphorylation of TOM1L1 that promotes trafficking of the metalloprotease MT1-MMP to invadopodia, which leads to tumour cell invasion.
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Affiliation(s)
- Clément Chevalier
- Montpellier University, Centre de Recherche de Biochimie Macromoléculaire, CNRS UMR 5237, 34293 Montpellier, France
| | - Guillaume Collin
- Montpellier University, Centre de Recherche de Biochimie Macromoléculaire, CNRS UMR 5237, 34293 Montpellier, France
| | - Simon Descamps
- Montpellier University, Centre de Recherche de Biochimie Macromoléculaire, CNRS UMR 5237, 34293 Montpellier, France
| | - Heiani Touaitahuata
- Montpellier University, Centre de Recherche de Biochimie Macromoléculaire, CNRS UMR 5237, 34293 Montpellier, France
| | - Valérie Simon
- Montpellier University, Centre de Recherche de Biochimie Macromoléculaire, CNRS UMR 5237, 34293 Montpellier, France
| | - Nicolas Reymond
- Montpellier University, Centre de Recherche de Biochimie Macromoléculaire, CNRS UMR 5237, 34293 Montpellier, France
| | - Laurent Fernandez
- Centre de Biochimie Structurale, CNRS UMR 5048-INSERM UMR 1054, 29 rue de navacelles, 34090 Montpellier, France
| | - Pierre-Emmanuel Milhiet
- Centre de Biochimie Structurale, CNRS UMR 5048-INSERM UMR 1054, 29 rue de navacelles, 34090 Montpellier, France
| | | | - Serge Urbach
- Functional Proteomics Platform, 34090 Montpellier, France
| | - Laurence Lasorsa
- IRCM, Institut de Recherche en Cancérologie de Montpellier; INSERM U896, 34298 Montpellier, France
| | - Béatrice Orsetti
- IRCM, Institut de Recherche en Cancérologie de Montpellier; INSERM U896, 34298 Montpellier, France
| | - Florence Boissière-Michot
- Translational Research Unit, Institut régional du Cancer de Montpellier (ICM)-Val d'Aurelle, 34298 Montpellier, France
| | - Evelyne Lopez-Crapez
- Translational Research Unit, Institut régional du Cancer de Montpellier (ICM)-Val d'Aurelle, 34298 Montpellier, France
| | - Charles Theillet
- IRCM, Institut de Recherche en Cancérologie de Montpellier; INSERM U896, 34298 Montpellier, France
| | - Serge Roche
- Montpellier University, Centre de Recherche de Biochimie Macromoléculaire, CNRS UMR 5237, 34293 Montpellier, France
| | - Christine Benistant
- Montpellier University, Centre de Recherche de Biochimie Macromoléculaire, CNRS UMR 5237, 34293 Montpellier, France.,Centre de Biochimie Structurale, CNRS UMR 5048-INSERM UMR 1054, 29 rue de navacelles, 34090 Montpellier, France
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18
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Jouannet S, Saint-Pol J, Fernandez L, Nguyen V, Charrin S, Boucheix C, Brou C, Milhiet PE, Rubinstein E. TspanC8 tetraspanins differentially regulate the cleavage of ADAM10 substrates, Notch activation and ADAM10 membrane compartmentalization. Cell Mol Life Sci 2015; 73:1895-915. [PMID: 26686862 PMCID: PMC4819958 DOI: 10.1007/s00018-015-2111-z] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [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: 06/29/2015] [Revised: 11/03/2015] [Accepted: 12/03/2015] [Indexed: 01/08/2023]
Abstract
The metalloprotease ADAM10 mediates the shedding of the ectodomain of various cell membrane proteins, including APP, the precursor of the amyloid peptide Aβ, and Notch receptors following ligand binding. ADAM10 associates with the members of an evolutionary conserved subgroup of tetraspanins, referred to as TspanC8, which regulate its exit from the endoplasmic reticulum. Here we show that 4 of these TspanC8 (Tspan5, Tspan14, Tspan15 and Tspan33) which positively regulate ADAM10 surface expression levels differentially impact ADAM10-dependent Notch activation and the cleavage of several ADAM10 substrates, including APP, N-cadherin and CD44. Sucrose gradient fractionation, single molecule tracking and quantitative mass-spectrometry analysis of the repertoire of molecules co-immunoprecipitated with Tspan5, Tspan15 and ADAM10 show that these two tetraspanins differentially regulate ADAM10 membrane compartmentalization. These data represent a unique example where several tetraspanins differentially regulate the function of a common partner protein through a distinct membrane compartmentalization.
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Affiliation(s)
- Stéphanie Jouannet
- Inserm, U935, 94807, Villejuif, France.,Université Paris-Sud, Institut André Lwoff, 94807, Villejuif, France
| | - Julien Saint-Pol
- Inserm, U935, 94807, Villejuif, France.,Université Paris-Sud, Institut André Lwoff, 94807, Villejuif, France
| | - Laurent Fernandez
- Inserm, U1054, 34090, Montpellier, France.,Université de Montpellier, CNRS, UMR5048, Centre de Biochimie Structurale, Montpellier, France
| | - Viet Nguyen
- Université Paris-Sud, Institut André Lwoff, 94807, Villejuif, France
| | - Stéphanie Charrin
- Inserm, U935, 94807, Villejuif, France.,Université Paris-Sud, Institut André Lwoff, 94807, Villejuif, France
| | - Claude Boucheix
- Inserm, U935, 94807, Villejuif, France.,Université Paris-Sud, Institut André Lwoff, 94807, Villejuif, France
| | - Christel Brou
- Institut Pasteur, Laboratoire "Signalisation et Pathogenèse", 75015, Paris, France
| | - Pierre-Emmanuel Milhiet
- Inserm, U1054, 34090, Montpellier, France.,Université de Montpellier, CNRS, UMR5048, Centre de Biochimie Structurale, Montpellier, France
| | - Eric Rubinstein
- Inserm, U935, 94807, Villejuif, France. .,Université Paris-Sud, Institut André Lwoff, 94807, Villejuif, France.
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19
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Chamontin C, Rassam P, Ferrer M, Racine PJ, Neyret A, Lainé S, Milhiet PE, Mougel M. HIV-1 nucleocapsid and ESCRT-component Tsg101 interplay prevents HIV from turning into a DNA-containing virus. Nucleic Acids Res 2014; 43:336-47. [PMID: 25488808 PMCID: PMC4288153 DOI: 10.1093/nar/gku1232] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [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] [Indexed: 01/01/2023] Open
Abstract
HIV-1, the agent of the AIDS pandemic, is an RNA virus that reverse transcribes its RNA genome (gRNA) into DNA, shortly after its entry into cells. Within cells, retroviral assembly requires thousands of structural Gag proteins and two copies of gRNA as well as cellular factors, which converge to the plasma membrane in a finely regulated timeline. In this process, the nucleocapsid domain of Gag (GagNC) ensures gRNA selection and packaging into virions. Subsequent budding and virus release require the recruitment of the cellular ESCRT machinery. Interestingly, mutating GagNC results into the release of DNA-containing viruses, by promo-ting reverse transcription (RTion) prior to virus release, through an unknown mechanism. Therefore, we explored the biogenesis of these DNA-containing particles, combining live-cell total internal-reflection fluorescent microscopy, electron microscopy, trans-complementation assays and biochemical characterization of viral particles. Our results reveal that DNA virus production is the consequence of budding defects associated with Gag aggregation at the plasma membrane and deficiency in the recruitment of Tsg101, a key ESCRT-I component. Indeed, targeting Tsg101 to virus assembly sites restores budding, restricts RTion and favors RNA packaging into viruses. Altogether, our results highlight the role of GagNC in the spatiotemporal control of RTion, via an ESCRT-I-dependent mechanism.
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Affiliation(s)
- Célia Chamontin
- CPBS, UMR5236 CNRS, University of Montpellier, 34293 Montpellier, France
| | - Patrice Rassam
- Centre de Biochimie Structurale, UMR5048 CNRS, University of Montpellier, 34090 Montpellier, France
| | - Mireia Ferrer
- CPBS, UMR5236 CNRS, University of Montpellier, 34293 Montpellier, France
| | - Pierre-Jean Racine
- CPBS, UMR5236 CNRS, University of Montpellier, 34293 Montpellier, France
| | - Aymeric Neyret
- CPBS, UMR5236 CNRS, University of Montpellier, 34293 Montpellier, France
| | - Sébastien Lainé
- CPBS, UMR5236 CNRS, University of Montpellier, 34293 Montpellier, France
| | - Pierre-Emmanuel Milhiet
- Centre de Biochimie Structurale, UMR5048 CNRS, University of Montpellier, 34090 Montpellier, France U1054 INSERM, 30090 Montpellier, France
| | - Marylène Mougel
- CPBS, UMR5236 CNRS, University of Montpellier, 34293 Montpellier, France
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20
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Godefroy C, Dahmane S, Dosset P, Adam O, Nicolai MC, Ronzon F, Milhiet PE. Mimicking influenza virus fusion using supported lipid bilayers. Langmuir 2014; 30:11394-11400. [PMID: 25186242 DOI: 10.1021/la502591a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Influenza virus infection is a serious public health problem in the world, and understanding the molecular mechanisms involved in viral replication is crucial. In this paper, we used a minimalist approach based on a lipid bilayer supported on mica, which we imaged by atomic force microscopy (AFM) in a physiological buffer, to analyze the different steps of influenza fusion, from the interaction of intact viruses with the supported bilayer to their complete fusion. Our results show that sialic acid recognition and priming upon acidification are sufficient for a complete fusion with the host cell membrane. After fusion, a flat and continuous membrane was observed. Because of the fragility of the viral membrane that was removed by the tip, most probably due to the disorganization of the matrix layer at acidic pH, fine structural details of ribonucleoproteins (RNP) were obtained. In addition, AFM topography of intact virus in interaction with the supported lipid bilayer confirms that hemeagglutinin and neuraminidase can form isolated clusters within the viral membrane.
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Affiliation(s)
- Cédric Godefroy
- Institut National de la Santé et de la Recherche Médicale, Unité 1054, 34090 Montpellier, France
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21
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Guyomarc'h F, Zou S, Chen M, Milhiet PE, Godefroy C, Vié V, Lopez C. Milk sphingomyelin domains in biomimetic membranes and the role of cholesterol: morphology and nanomechanical properties investigated using AFM and force spectroscopy. Langmuir 2014; 30:6516-6524. [PMID: 24835749 DOI: 10.1021/la501640y] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Milk sphingomyelin (MSM) and cholesterol segregate into domains in the outer bilayer membrane surrounding milk fat globules. To elucidate the morphology and mechanical properties of theses domains, supported lipid bilayers with controlled molar proportions of MSM, dioleoylphosphatidylcholine (DOPC) and cholesterol were produced in buffer mimicking conditions of the milk aqueous phase. Atomic force microscopy imaging showed that (i) for T < 35 °C MSM segregated in gel phase domains protruding above the fluid phase, (ii) the addition of 20 mol % cholesterol resulted in smaller and more elongated l(o) phase domains than in equimolar MSM/DOPC membranes, (iii) the MSM/cholesterol-enriched l(o) phase domains were less salient than the MSM gel phase domains. Force spectroscopy measurements furthermore showed that cholesterol reduced the resistance of MSM/DOPC membrane to perforation. The results are discussed with respect to the effect of cholesterol on the biophysical properties of lipid membranes. The combination of AFM imaging and force mapping provides unprecedented insight into the structural and mechanical properties of milk lipid membranes, and opens perspectives for investigation of the functional properties of MSM domains during milk fat processing or digestion.
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22
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Dahmane S, Rubinstein E, Milhiet PE. Viruses and tetraspanins: lessons from single molecule approaches. Viruses 2014; 6:1992-2011. [PMID: 24800676 PMCID: PMC4036545 DOI: 10.3390/v6051992] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [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: 02/07/2014] [Revised: 03/24/2014] [Accepted: 04/10/2014] [Indexed: 12/15/2022] Open
Abstract
Tetraspanins are four-span membrane proteins that are widely distributed in multi-cellular organisms and involved in several infectious diseases. They have the unique property to form a network of protein-protein interaction within the plasma membrane, due to the lateral associations with one another and with other membrane proteins. Tracking tetraspanins at the single molecule level using fluorescence microscopy has revealed the membrane behavior of the tetraspanins CD9 and CD81 in epithelial cell lines, providing a first dynamic view of this network. Single molecule tracking highlighted that these 2 proteins can freely diffuse within the plasma membrane but can also be trapped, permanently or transiently, in tetraspanin-enriched areas. More recently, a similar strategy has been used to investigate tetraspanin membrane behavior in the context of human immunodeficiency virus type 1 (HIV-1) and hepatitis C virus (HCV) infection. In this review we summarize the main results emphasizing the relationship in terms of membrane partitioning between tetraspanins, some of their partners such as Claudin-1 and EWI-2, and viral proteins during infection. These results will be analyzed in the context of other membrane microdomains, stressing the difference between raft and tetraspanin-enriched microdomains, but also in comparison with virus diffusion at the cell surface. New advanced single molecule techniques that could help to further explore tetraspanin assemblies will be also discussed.
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Affiliation(s)
- Selma Dahmane
- Inserm, Unité 1054, Single Molecule Biophysics Department, Centre de Biochimie Structurale, 34090, Montpellier, France.
| | | | - Pierre-Emmanuel Milhiet
- Inserm, Unité 1054, Single Molecule Biophysics Department, Centre de Biochimie Structurale, 34090, Montpellier, France.
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23
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Greiner VJ, Manin C, Larquet E, Ikhelef N, Gréco F, Naville S, Milhiet PE, Ronzon F, Klymchenko A, Mély Y. Characterization of the structural modifications accompanying the loss of HBsAg particle immunogenicity. Vaccine 2014; 32:1049-54. [DOI: 10.1016/j.vaccine.2014.01.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 12/20/2013] [Accepted: 01/02/2014] [Indexed: 10/25/2022]
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24
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Cattoni DI, Thakur S, Godefroy C, Le Gall A, Lai-Kee-Him J, Milhiet PE, Bron P, Nöllmann M. Structure and DNA-binding properties of the Bacillus subtilis SpoIIIE DNA translocase revealed by single-molecule and electron microscopies. Nucleic Acids Res 2013; 42:2624-36. [PMID: 24297254 PMCID: PMC3936747 DOI: 10.1093/nar/gkt1231] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [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] [Indexed: 11/13/2022] Open
Abstract
SpoIIIE/FtsK are a family of ring-shaped, membrane-anchored, ATP-fuelled motors required to segregate DNA across bacterial membranes. This process is directional and requires that SpoIIIE/FtsK recognize highly skewed octameric sequences (SRS/KOPS for SpoIIIE/FtsK) distributed along the chromosome. Two models have been proposed to explain the mechanism by which SpoIIIE/FtsK interact with DNA. The loading model proposes that SpoIIIE/FtsK oligomerize exclusively on SpoIIIE recognition sequence/orienting polar sequences (SRS/KOPS) to accomplish directional DNA translocation, whereas the target search and activation mechanism proposes that pre-assembled SpoIIIE/FtsK hexamers bind to non-specific DNA, reach SRS/KOPS by diffusion/3d hopping and activate at SRS/KOPS. Here, we employ single-molecule total internal reflection imaging, atomic force and electron microscopies and ensemble biochemical methods to test these predictions and obtain further insight into the SpoIIIE–DNA mechanism of interaction. First, we find that SpoIIIE binds DNA as a homo-hexamer with neither ATP binding nor hydrolysis affecting the binding mechanism or affinity. Second, we show that hexameric SpoIIIE directly binds to double-stranded DNA without requiring the presence of SRS or free DNA ends. Finally, we find that SpoIIIE hexamers can show open and closed conformations in solution, with open-ring conformations most likely resembling a state poised to load to non-specific, double-stranded DNA. These results suggest how SpoIIIE and related ring-shaped motors may be split open to bind topologically closed DNA.
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Affiliation(s)
- Diego I Cattoni
- Centre de Biochimie Structurale, Department of Single-Molecule Biophysics CNRS UMR5048, INSERM U554, Université de Montpellier I & II, 29 rue de Navacelles, 34090 Montpellier, France
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25
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Guinan T, Godefroy C, Lautrédou N, Pace S, Milhiet PE, Voelcker N, Cunin F. Interaction of antibiotics with lipid vesicles on thin film porous silicon using reflectance interferometric Fourier transform spectroscopy. Langmuir 2013; 29:10279-86. [PMID: 23844993 DOI: 10.1021/la401804e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The ability to observe interactions of drugs with cell membranes is an important area in pharmaceutical research. However, these processes are often difficult to understand due to the dynamic nature of cell membranes. Therefore, artificial systems composed of lipids have been used to study membrane properties and their interaction with drugs. Here, lipid vesicle adsorption, rupture, and formation of planar lipid bilayers induced by various antibiotics (surfactin, azithromycin, gramicidin, melittin and ciprofloxacin) and the detergent dodecyl-b-D-thiomaltoside (DOTM) was studied using reflective interferometric Fourier transform spectroscopy (RIFTS) on an oxidized porous silicon (pSi) surface as a transducer. The pSi transducer surfaces are prepared as thin films of 3 μm thickness with pore dimensions of a few nanometers in diameter by electrochemical etching of crystalline silicon followed by passivation with a thermal oxide layer. Furthermore, the sensitivity of RIFTS was investigated using three different concentrations of surfactin. Complementary techniques including atomic force microscopy, fluorescence recovery after photobleaching, and fluorescence microscopy were used to validate the RIFTS-based method and confirm adsorption and consequent rupture of vesicles to form a phospholipid bilayer upon the addition of antibiotics. The method provides a sensitive and real-time approach to monitor the antibiotic-induced transition of lipid vesicles to phospholipid bilayers.
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Affiliation(s)
- Taryn Guinan
- Mawson Institute, University of South Australia, Adelaide, Australia
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26
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Cattoni DI, Chara O, Godefroy C, Margeat E, Trigueros S, Milhiet PE, Nöllmann M. SpoIIIE mechanism of directional translocation involves target search coupled to sequence-dependent motor stimulation. EMBO Rep 2013; 14:473-9. [PMID: 23559069 DOI: 10.1038/embor.2013.39] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Revised: 03/05/2013] [Accepted: 03/11/2013] [Indexed: 11/09/2022] Open
Abstract
SpoIIIE/FtsK are membrane-anchored, ATP-fuelled, directional motors responsible for chromosomal segregation in bacteria. Directionality in these motors is governed by interactions between specialized sequence-recognition modules (SpoIIIE-γ/FtsK-γ) and highly skewed chromosomal sequences (SRS/KOPS). Using a new combination of ensemble and single-molecule methods, we dissect the series of steps required for SRS localization and motor activation. First, we demonstrate that SpoIIIE/DNA association kinetics are sequence independent, with binding specificity being uniquely determined by dissociation. Next, we show by single-molecule and modelling methods that hexameric SpoIIIE binds DNA non-specifically and finds SRS by an ATP-independent target search mechanism, with ensuing oligomerization and binding of SpoIIIE-γ to SRS triggering motor stimulation. Finally, we propose a new model that provides an entirely new interpretation of previous observations for the origin of SRS/KOPS-directed translocation by SpoIIIE/FtsK.
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Affiliation(s)
- Diego I Cattoni
- Centre de Biochimie Structurale, CNRS UMR5048, INSERM U1054, Université de Montpellier I & II, 34090 Montpellier, France
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27
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Potel J, Rassam P, Montpellier C, Kaestner L, Werkmeister E, Tews BA, Couturier C, Popescu CI, Baumert TF, Rubinstein E, Dubuisson J, Milhiet PE, Cocquerel L. EWI-2wint promotes CD81 clustering that abrogates Hepatitis C Virus entry. Cell Microbiol 2013; 15:1234-52. [PMID: 23351194 PMCID: PMC7162402 DOI: 10.1111/cmi.12112] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [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: 07/25/2012] [Revised: 12/14/2012] [Accepted: 01/10/2013] [Indexed: 01/07/2023]
Abstract
CD81 is a major receptor for Hepatitis C Virus (HCV). It belongs to the tetraspanin family whose members form dynamic clusters with numerous partner proteins and with one another, forming tetraspanin-enriched areas in the plasma membrane. In our study, we combined single-molecule microscopy and biochemistry experiments to investigate the clustering and membrane behaviour of CD81 in the context of cells expressing EWI-2wint, a natural inhibitor of HCV entry. Interestingly, we found that EWI-2wint reduces the global diffusion of CD81 molecules due to a decrease of the diffusion rate of mobile CD81 molecules and an increase in the proportion of confined molecules. Indeed, we demonstrated that EWI-2wint promotes CD81 clustering and confinement in CD81-enriched areas. In addition, we showed that EWI-2wint influences the colocalization of CD81 with Claudin-1 - a co-receptor required for HCV entry. Together, our results indicate that a change in membrane partitioning of CD81 occurs in the presence of EWI-2wint. This study gives new insights on the mechanism by which HCV enters into its target cells, namely by exploiting the dynamic properties of CD81.
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Affiliation(s)
- Julie Potel
- Hepatitis C Laboratory, Center for Infection and Immunity of Lille, University Lille Nord de France, CNRS-UMR8204, Inserm-U1019, Pasteur Institute of Lille, Lille, France
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28
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Cattoni DI, Chara O, Godefroy C, Margeat E, Trigueros S, Milhiet PE, Nollmann M. Spoiiie Mechanism of Directional Translocation Involves Target Search Coupled to Allosteric Motor Activation. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.2996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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29
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Levy D, Milhiet PE. Imaging of transmembrane proteins directly incorporated within supported lipid bilayers using atomic force microscopy. Methods Mol Biol 2013; 950:343-357. [PMID: 23086884 DOI: 10.1007/978-1-62703-137-0_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 06/01/2023]
Abstract
Structural analysis of transmembrane proteins remains a challenge in biology, mainly due to their difficulty in being overexpressed and the required use of detergents that impair different steps of biochemistry classically used to obtain 3D crystals. In this context, we have developed a new technique for protein incorporation within supported lipid bilayers that only requires a few picomoles of protein per assay. Proteins are directly inserted into a detergent-destabilized bilayer that can be imaged in buffer with atomic force microscopy (AFM) allowing structural analysis down to sub-nanometer lateral resolution. In this chapter, we describe the main guidelines for this technique, from the choice of detergent to the requirements for AFM high-resolution imaging.
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30
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Picas L, Milhiet PE, Hernández-Borrell J. Atomic force microscopy: a versatile tool to probe the physical and chemical properties of supported membranes at the nanoscale. Chem Phys Lipids 2012. [PMID: 23194897 DOI: 10.1016/j.chemphyslip.2012.10.005] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Atomic force microscopy (AFM) was developed in the 1980s following the invention of its precursor, scanning tunneling microscopy (STM), earlier in the decade. Several modes of operation have evolved, demonstrating the extreme versatility of this method for measuring the physicochemical properties of samples at the nanoscopic scale. AFM has proved an invaluable technique for visualizing the topographic characteristics of phospholipid monolayers and bilayers, such as roughness, height or laterally segregated domains. Implemented modes such as phase imaging have also provided criteria for discriminating the viscoelastic properties of different supported lipid bilayer (SLB) regions. In this review, we focus on the AFM force spectroscopy (FS) mode, which enables determination of the nanomechanical properties of membrane models. The interpretation of force curves is presented, together with newly emerging techniques that provide complementary information on physicochemical properties that may contribute to our understanding of the structure and function of biomembranes. Since AFM is an imaging technique, some basic indications on how real-time AFM imaging is evolving are also presented at the end of this paper.
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Affiliation(s)
- Laura Picas
- Institut Curie, CNRS UMR 144, 26 rue d'Ulm, 75248 Paris, France
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31
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Harris HJ, Clerte C, Farquhar MJ, Goodall M, Hu K, Rassam P, Dosset P, Wilson GK, Balfe P, Ijzendoorn SC, Milhiet PE, McKeating JA. Hepatoma polarization limits CD81 and hepatitis C virus dynamics. Cell Microbiol 2012; 15:430-45. [PMID: 23126643 PMCID: PMC3599488 DOI: 10.1111/cmi.12047] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [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: 05/23/2012] [Revised: 09/08/2012] [Accepted: 09/27/2012] [Indexed: 12/12/2022]
Abstract
Many viruses target the polarized epithelial apex during host invasion. In contrast, hepatitis C virus (HCV) engages receptors at the basal surface of hepatocytes in the polarized liver parenchyma. Hepatocyte polarization limits HCV entry by undefined mechanism(s). Given the recent reports highlighting a role for receptor mobility in pathogen entry, we studied the effect(s) of hepatocyte polarization on viral receptor and HCV pseudoparticle (HCVpp) dynamics using real-time fluorescence recovery after photobleaching and single particle tracking. Hepatoma polarization reduced CD81 and HCVpp dynamics at the basal membrane. Since cell polarization is accompanied by changes in the actin cytoskeleton and CD81 links to actin via its C-terminus, we studied the dynamics of a mutant CD81 lacking a C-terminal tail (CD81(ΔC)) and its effect(s) on HCVpp mobility and infection. CD81(ΔC) showed an increased frequency of confined trajectories and a reduction of Brownian diffusing molecules compared to wild-type protein in non-polarized cells. However, these changes were notobserved in polarized cells. HCVpp showed a significant reduction in Brownian diffusion and infection of CD81(ΔC) expressing non-polarized cells. In summary, these data highlight the dynamic nature of CD81 and demonstrate a role for CD81 lateral diffusion to regulate HCV infection in a polarization-dependent manner.
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Affiliation(s)
- H J Harris
- School of Immunity and Infection, University of Birmingham, Birmingham, UK
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32
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Deshayes S, Konate K, Rydström A, Crombez L, Godefroy C, Milhiet PE, Thomas A, Brasseur R, Aldrian G, Heitz F, Muñoz-Morris MA, Devoisselle JM, Divita G. Self-assembling peptide-based nanoparticles for siRNA delivery in primary cell lines. Small 2012; 8:2184-2188. [PMID: 22514050 DOI: 10.1002/smll.201102413] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2011] [Indexed: 05/31/2023]
Affiliation(s)
- Sébastien Deshayes
- Centre de Recherches de Biochimie Macromoléculaire, Department of Molecular Biophysics and Therapeutics, CNRS UMR-5237, UM1-UM2 University of Montpellier, 1919 Route de Mende, 34293 Montpellier, France
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33
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Pace S, Seantier B, Belamie E, Lautrédou N, Sailor MJ, Milhiet PE, Cunin F. Characterization of phospholipid bilayer formation on a thin film of porous SiO2 by reflective interferometric Fourier transform spectroscopy (RIFTS). Langmuir 2012; 28:6960-9. [PMID: 22486481 DOI: 10.1021/la301085t] [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] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Classical methods for characterizing supported artificial phospholipid bilayers include imaging techniques such as atomic force microscopy and fluorescence microscopy. The use in the past decade of surface-sensitive methods such as surface plasmon resonance and ellipsometry, and acoustic sensors such as the quartz crystal microbalance, coupled to the imaging methods, have expanded our understanding of the formation mechanisms of phospholipid bilayers. In the present work, reflective interferometric Fourier transform spectrocopy (RIFTS) is employed to monitor the formation of a planar phospholipid bilayer on an oxidized mesoporous Si (pSiO(2)) thin film. The pSiO(2) substrates are prepared as thin films (3 μm thick) with pore dimensions of a few nanometers in diameter by the electrochemical etching of crystalline silicon, and they are passivated with a thin thermal oxide layer. A thin film of mica is used as a control. Interferometric optical measurements are used to quantify the behavior of the phospholipids at the internal (pores) and external surfaces of the substrates. The optical measurements indicate that vesicles initially adsorb to the pSiO(2) surface as a monolayer, followed by vesicle fusion and conversion to a surface-adsorbed lipid bilayer. The timescale of the process is consistent with prior measurements of vesicle fusion onto mica surfaces. Reflectance spectra calculated using a simple double-layer Fabry-Perot interference model verify the experimental results. The method provides a simple, real-time, nondestructive approach to characterizing the growth and evolution of lipid vesicle layers on the surface of an optical thin film.
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Affiliation(s)
- Stéphanie Pace
- Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-ENSCM-UM2-UM1, Matériaux Avancés pour la Catalyse et la Santé, Ecole Nationale Supérieure de Chimie de Montpellier, Montpellier, France
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34
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Rassam P, Margeat E, Dosset P, Rubinstein E, Milhiet PE. Analyzing Differential Dynamics of CD9 and CD81 with Single Molecule Tracking. Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.3557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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35
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Seantier B, Dezi M, Gubellini F, Berquand A, Godefroy C, Dosset P, Lévy D, Milhiet PE. Transfer on hydrophobic substrates and AFM imaging of membrane proteins reconstituted in planar lipid bilayers. J Mol Recognit 2011; 24:461-6. [DOI: 10.1002/jmr.1070] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Milhiet PE, Dosset P, Godefroy C, Le Grimellec C, Guigner JM, Larquet E, Ronzon F, Manin C. Nanoscale topography of hepatitis B antigen particles by atomic force microscopy. Biochimie 2010; 93:254-9. [PMID: 20887766 DOI: 10.1016/j.biochi.2010.09.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Accepted: 09/21/2010] [Indexed: 10/19/2022]
Abstract
Hepatitis B virus envelope is mainly composed of three forms of the same protein expressed from different start codons of the same open reading frame. The smaller form named S protein corresponds to the C-terminal common region and represents about 80% of the envelope proteins. It is mainly referred as hepatitis B virus surface antigen (HBsAg). Over expressed in the host cell, this protein can be produced as spherical and tubular self-organized particles. Highly immunogenic, these particles are used in licensed hepatitis B vaccines. In this study we have combined transmission electron microscopy and atomic force microscopy to determine the shape and size of HBsAg particles produced from the yeast Hansenula polymorpha. Tapping mode atomic force microscopy in liquid allows structural details of the surface to be delineated with a resolution in the nanometer range. Particles were decorated by closely packed spike-like structures protruding from particle surface. Protrusions appeared uniformly distributed at the surface and an average number of 75 protrusions per particle were calculated. Importantly, we demonstrated that proteins mainly contribute to the topography of the protrusions.
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Krementsov DN, Rassam P, Margeat E, Roy NH, Schneider-Schaulies J, Milhiet PE, Thali M. HIV-1 Assembly Differentially Alters Dynamics and Partitioning of Tetraspanins and Raft Components. Traffic 2010; 11:1401-14. [DOI: 10.1111/j.1600-0854.2010.01111.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Picas L, Carretero-Genevrier A, Montero MT, Vázquez-Ibar J, Seantier B, Milhiet PE, Hernández-Borrell J. Preferential insertion of lactose permease in phospholipid domains: AFM observations. Biochimica et Biophysica Acta (BBA) - Biomembranes 2010; 1798:1014-9. [DOI: 10.1016/j.bbamem.2010.01.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Revised: 01/01/2010] [Accepted: 01/11/2010] [Indexed: 11/29/2022]
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Giocondi MC, Yamamoto D, Lesniewska E, Milhiet PE, Ando T, Le Grimellec C. Surface topography of membrane domains. Biochimica et Biophysica Acta (BBA) - Biomembranes 2010; 1798:703-18. [DOI: 10.1016/j.bbamem.2009.09.015] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2009] [Revised: 09/11/2009] [Accepted: 09/20/2009] [Indexed: 12/24/2022]
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Ferjani I, Fattoum A, Bettache N, Seantier B, Milhiet PE, Manai M, Benyamin Y, Roustan C, Maciver SK. The gelsolin:calponin complex nucleates actin filaments with distinct morphologies. Biochem Biophys Res Commun 2010; 392:118-23. [PMID: 20035726 DOI: 10.1016/j.bbrc.2009.12.103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Accepted: 12/17/2009] [Indexed: 11/20/2022]
Abstract
Gelsolin and calponin are cytoskeletal and signalling proteins that form a tight 1:1 complex (GCC). We show that calponin within the GCC inhibits the rate of gelsolin mediated nucleation of actin polymerization. The actin-binding function of calponin is ablated within the GCC as the actin-binding site overlaps with one of the gelsolin binding sites. The structure of filaments that result from nucleation by GCC are different to those nucleated by gelsolin alone in that they are longer, loosely bundled and stain heterogeneously with phalloidin. GCC nucleated filaments appear contorted and wrap around each to form the loose bundles.
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Affiliation(s)
- Imen Ferjani
- DIMNP, University of Montpellier 2 and 1, CNRS Montpellier, Place E. Bataillon CC107, 34095 Montpellier Cedex 5, France
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Pace S, Gonzalez P, Devoisselle JM, Milhiet PE, Brunel D, Cunin F. Grafting of monoglyceride molecules for the design of hydrophilic and stable porous silicon surfaces. NEW J CHEM 2010. [DOI: 10.1039/b9nj00469f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Picas L, Montero MT, Morros A, Cabañas ME, Seantier B, Milhiet PE, Hernández-Borrell J. Calcium-Induced Formation of Subdomains in Phosphatidylethanolamine−Phosphatidylglycerol Bilayers: A Combined DSC, 31P NMR, and AFM Study. J Phys Chem B 2009; 113:4648-55. [DOI: 10.1021/jp8102468] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Laura Picas
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona (UB), and Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN2UB), E-08028 Barcelona, Spain, Unitat de Biofísica, Departament de Bioquímica i Biologia Molecular, Facultat de Medicina, Centre d’Estudis en Biofísica (CEB), and Servei de Ressonància Magnètica Nuclear (SeRMN), UAB, E-08193 Bellaterra, Barcelona, Spain, and Inserm, Unité 554, Montpellier, France, and Centre de Biochimie Structurale, Université
| | - M. Teresa Montero
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona (UB), and Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN2UB), E-08028 Barcelona, Spain, Unitat de Biofísica, Departament de Bioquímica i Biologia Molecular, Facultat de Medicina, Centre d’Estudis en Biofísica (CEB), and Servei de Ressonància Magnètica Nuclear (SeRMN), UAB, E-08193 Bellaterra, Barcelona, Spain, and Inserm, Unité 554, Montpellier, France, and Centre de Biochimie Structurale, Université
| | - Antoni Morros
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona (UB), and Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN2UB), E-08028 Barcelona, Spain, Unitat de Biofísica, Departament de Bioquímica i Biologia Molecular, Facultat de Medicina, Centre d’Estudis en Biofísica (CEB), and Servei de Ressonància Magnètica Nuclear (SeRMN), UAB, E-08193 Bellaterra, Barcelona, Spain, and Inserm, Unité 554, Montpellier, France, and Centre de Biochimie Structurale, Université
| | - Miquel E. Cabañas
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona (UB), and Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN2UB), E-08028 Barcelona, Spain, Unitat de Biofísica, Departament de Bioquímica i Biologia Molecular, Facultat de Medicina, Centre d’Estudis en Biofísica (CEB), and Servei de Ressonància Magnètica Nuclear (SeRMN), UAB, E-08193 Bellaterra, Barcelona, Spain, and Inserm, Unité 554, Montpellier, France, and Centre de Biochimie Structurale, Université
| | - Bastien Seantier
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona (UB), and Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN2UB), E-08028 Barcelona, Spain, Unitat de Biofísica, Departament de Bioquímica i Biologia Molecular, Facultat de Medicina, Centre d’Estudis en Biofísica (CEB), and Servei de Ressonància Magnètica Nuclear (SeRMN), UAB, E-08193 Bellaterra, Barcelona, Spain, and Inserm, Unité 554, Montpellier, France, and Centre de Biochimie Structurale, Université
| | - Pierre-Emmanuel Milhiet
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona (UB), and Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN2UB), E-08028 Barcelona, Spain, Unitat de Biofísica, Departament de Bioquímica i Biologia Molecular, Facultat de Medicina, Centre d’Estudis en Biofísica (CEB), and Servei de Ressonància Magnètica Nuclear (SeRMN), UAB, E-08193 Bellaterra, Barcelona, Spain, and Inserm, Unité 554, Montpellier, France, and Centre de Biochimie Structurale, Université
| | - Jordi Hernández-Borrell
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona (UB), and Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN2UB), E-08028 Barcelona, Spain, Unitat de Biofísica, Departament de Bioquímica i Biologia Molecular, Facultat de Medicina, Centre d’Estudis en Biofísica (CEB), and Servei de Ressonància Magnètica Nuclear (SeRMN), UAB, E-08193 Bellaterra, Barcelona, Spain, and Inserm, Unité 554, Montpellier, France, and Centre de Biochimie Structurale, Université
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Espenel C, Margeat E, Dosset P, Arduise C, Le Grimellec C, Royer CA, Boucheix C, Rubinstein E, Milhiet PE. Single-molecule analysis of CD9 dynamics and partitioning reveals multiple modes of interaction in the tetraspanin web. ACTA ACUST UNITED AC 2008; 182:765-76. [PMID: 18710926 PMCID: PMC2518714 DOI: 10.1083/jcb.200803010] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [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] [Indexed: 01/07/2023]
Abstract
Tetraspanins regulate cell migration, sperm–egg fusion, and viral infection. Through interactions with one another and other cell surface proteins, tetraspanins form a network of molecular interactions called the tetraspanin web. In this study, we use single-molecule fluorescence microscopy to dissect dynamics and partitioning of the tetraspanin CD9. We show that lateral mobility of CD9 in the plasma membrane is regulated by at least two modes of interaction that each exhibit specific dynamics. The majority of CD9 molecules display Brownian behavior but can be transiently confined to an interaction platform that is in permanent exchange with the rest of the membrane. These platforms, which are enriched in CD9 and its binding partners, are constant in shape and localization. Two CD9 molecules undergoing Brownian trajectories can also codiffuse, revealing extra platform interactions. CD9 mobility and partitioning are both dependent on its palmitoylation and plasma membrane cholesterol. Our data show the high dynamic of interactions in the tetraspanin web and further indicate that the tetraspanin web is distinct from raft microdomains.
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Affiliation(s)
- Cedric Espenel
- Institut National de la Santé et de la Recherche Medicale, Unité 554, Montpellier, France
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André M, Morelle W, Planchon S, Milhiet PE, Rubinstein E, Mollicone R, Chamot-Rooke J, Le Naour F. Glycosylation status of the membrane protein CD9P-1. Proteomics 2007; 7:3880-95. [DOI: 10.1002/pmic.200700355] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Cunin F, Milhiet PE, Anglin E, Sailor MJ, Espenel C, Le Grimellec C, Brunel D, Devoisselle JM. Continuous planar phospholipid bilayer supported on porous silicon thin film reflector. Ultramicroscopy 2007; 107:1048-52. [PMID: 17600623 DOI: 10.1016/j.ultramic.2007.02.041] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2006] [Accepted: 02/12/2007] [Indexed: 11/17/2022]
Abstract
Reconstituting artificial membranes for in vitro studies of cell barrier mechanisms and properties is of major interest in biology. Here, artificial membranes supported on porous silicon photonic crystal reflectors are prepared and investigated. The materials are of interest for label-free probing of supported membrane events such as protein binding, molecular recognition, and transport. The porous silicon substrates are prepared as multilayered films consisting of a periodically varying porosity, with pore dimensions of a few nanometers in size. Planar phospholipid bilayers are deposited on the topmost surface of the oxidized hydrophilic mesoporous silicon films. Atomic force microscopy provides evidence of continuous bilayer deposition at the surface, and optical measurements indicate that the lipids do not significantly infiltrate the porous region. The presence of the supported bilayer does not obstruct the optical spectrum from the porous silicon layer, suggesting that the composite structures can act as effective optical biosensors.
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Affiliation(s)
- Frédérique Cunin
- Institut Charles Gerhardt, UMR 5253 CNRS/ENSCM/UM2/UM1, Ecole Nationale Supérieure de Chimie de Montpellier, France.
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Berquand A, Lévy D, Gubellini F, Le Grimellec C, Milhiet PE. Influence of calcium on direct incorporation of membrane proteins into in-plane lipid bilayer. Ultramicroscopy 2007; 107:928-33. [PMID: 17544216 DOI: 10.1016/j.ultramic.2007.04.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [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: 11/23/2022]
Abstract
Reconstitution of transmembrane proteins by direct incorporation into supported lipid bilayers (SLBs) is a new method to provide suitable samples for high-resolution atomic force microscopy (AFM) analysis of membrane proteins. First experiments have reported successful incorporation of proteins into detergent-destabilized SLBs. Here, we analyzed by AFM the incorporation of membrane proteins in the presence of calcium, a divalent cation functionally important for several membrane proteins. Using lipid-phase-separated membranes, we first show that calcium strongly stabilizes the SLBs decreasing the insertion of low cmc detergents, dodecyl-beta-maltoside, dodecyl-beta-thiomaltoside, and N-hexadecylphosphocholine (Fos-Choline-16) and further insertion of proteins. However, high yield of protein insertion is recovered in the presence of calcium by increasing the detergent concentration in the solution. These data revealed the importance of the calcium in the structure of SLBs and provided new insights into the mechanism of protein insertion into these model membranes.
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Giocondi MC, Besson F, Dosset P, Milhiet PE, Le Grimellec C. Remodeling of ordered membrane domains by GPI-anchored intestinal alkaline phosphatase. Langmuir 2007; 23:9358-64. [PMID: 17661499 DOI: 10.1021/la700892z] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Glycosylphosphatidyl-inositol (GPI)-anchored proteins preferentially localize in the most ordered regions of the cell plasma membrane. Acyl and alkyl chain composition of GPI anchors influence the association with the ordered domains. This suggests that, conversely, changes in the fluid and in the ordered domains lipid composition affect the interaction of GPI-anchored proteins with membrane microdomains. Validity of this hypothesis was examined by investigating the spontaneous insertion of the GPI-anchored intestinal alkaline phophatase (BIAP) into the solid (gel) phase domains of preformed supported membranes made of dioleoylphosphatidylcholine/dipalmitoylphosphatidylcholine (DOPC/DPPC), DOPC/sphingomyelin (DOPC/SM), and palmitoyloleoylphosphatidylcholine/SM (POPC/SM). Atomic force microscopy (AFM) showed that BIAP inserted in the gel phases of the three mixtures. However, changes in the lipid composition of membranes had a marked effect on the protein containing bilayer topography. Moreover, BIAP insertion was associated with a net transfer of phospholipids from the fluid to the gel (DOPC/DPPC) or from the gel to the fluid (POPC/SM) phases. For DOPC/SM bilayers, transfer of lipids was dependent on the homogeneity of the gel SM phase. The data strongly suggest that BIAP interacts with the most ordered lipid species present in the gel phases of phase-separated membranes. They also suggest that GPI-anchored proteins might contribute to the selection of their own microdomain environment.
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Affiliation(s)
- Marie-Cécile Giocondi
- Institut National de la Santé et de la Recherche Médicale, Unité 554, Montpellier, France
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Giocondi MC, Besson F, Dosset P, Milhiet PE, Le Grimellec C. Temperature-dependent localization of GPI-anchored intestinal alkaline phosphatase in model rafts. J Mol Recognit 2007; 20:531-7. [PMID: 17703464 DOI: 10.1002/jmr.835] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [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: 11/07/2022]
Abstract
In plasma membranes, most of glycosylphosphatidylinositol (GPI)-anchored proteins would be associated with rafts, a category of ordered microdomains enriched in sphingolipids and cholesterol (Ch). They would be also concentrated in the detergent resistant membranes (DRMs), a plasma membrane fraction extracted at low temperature. Preferential localization of GPI-anchored proteins in these membrane domains is essentially governed by their high lipid order, as compared to their environment. Changes in the temperature are expected to modify the membrane lipid order, suggesting that they could affect the distribution of GPI-anchored proteins between membrane domains. Validity of this hypothesis was examined by investigating the temperature-dependent localization of the GPI-anchored bovine intestinal alkaline phophatase (BIAP) into model raft made of palmitoyloleoylphosphatidylcholine/sphingomyelin/cholesterol (POPC/SM/Chl) supported membranes. Atomic force microscopy (AFM) shows that the inserted BIAP is localized in the SM/Chl enriched ordered domains at low temperature. Above 30 degrees C, BIAP redistributes and is present in both the 'fluid' POPC enriched and the ordered SM/Chl domains. These data strongly suggest that in cells the composition of plasma membrane domains at low temperature differs from that at physiological temperature.
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Affiliation(s)
- Marie-Cécile Giocondi
- Institut National de la Santé et de la Recherche Médicale, Unité 554, Montpellier, France
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Milhiet PE, Gubellini F, Berquand A, Dosset P, Rigaud JL, Le Grimellec C, Lévy D. High-resolution AFM of membrane proteins directly incorporated at high density in planar lipid bilayer. Biophys J 2006; 91:3268-75. [PMID: 16905620 PMCID: PMC1614478 DOI: 10.1529/biophysj.106.087791] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.6] [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: 11/18/2022] Open
Abstract
The heterologous expression and purification of membrane proteins represent major limitations for their functional and structural analysis. Here we describe a new method of incorporation of transmembrane proteins in planar lipid bilayer starting from 1 pmol of solubilized proteins. The principle relies on the direct incorporation of solubilized proteins into a preformed planar lipid bilayer destabilized by dodecyl-beta-maltoside or dodecyl-beta-thiomaltoside, two detergents widely used in membrane biochemistry. Successful incorporations are reported at 20 degrees C and at 4 degrees C with three bacterial photosynthetic multi-subunit membrane proteins. Height measurements by atomic force microscopy (AFM) of the extramembraneous domains protruding from the bilayer demonstrate that proteins are unidirectionally incorporated within the lipid bilayer through their more hydrophobic domains. Proteins are incorporated at high density into the bilayer and on incubation diffuse and segregate into protein close-packing areas. The high protein density allows high-resolution AFM topographs to be recorded and protein subunits organization delineated. This approach provides an alternative experimental platform to the classical methods of two-dimensional crystallization of membrane proteins for the structural analysis by AFM. Furthermore, the versatility and simplicity of the method are important intrinsic properties for the conception of biosensors and nanobiomaterials involving membrane proteins.
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Affiliation(s)
- Pierre-Emmanuel Milhiet
- Centre de Biochimie Structurale, Groupe Nanostructures et Complexes Membranaires, UMR 554 INSERM, UMR 5048 CNRS, Montpellier, France
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