Wasp and WAVE Proteins: from Structure, Through Function, To
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The Wiskott-Aldrich Syndrome: the Actin Cytoskeleton and Immune Cell Function
Disease Markers 29 (2010) 157–175 157 DOI 10.3233/DMA-2010-0735 IOS Press The Wiskott-Aldrich syndrome: The actin cytoskeleton and immune cell function Michael P. Blundella, Austen Wortha,b, Gerben Boumaa and Adrian J. Thrashera,b,∗ aMolecular Immunology Unit, UCL Institute of Child Health, London, UK bDepartment of Immunology, Great Ormond Street Hospital NHS Trust, Great Ormond Street, London, UK Abstract. Wiskott-Aldrich syndrome (WAS) is a rare X-linked recessive primary immunodeficiency characterised by immune dysregulation, microthrombocytopaenia, eczema and lymphoid malignancies. Mutations in the WAS gene can lead to distinct syndrome variations which largely, although not exclusively, depend upon the mutation. Premature termination and deletions abrogate Wiskott-Aldrich syndrome protein (WASp) expression and lead to severe disease (WAS). Missense mutations usually result in reduced protein expression and the phenotypically milder X-linked thrombocytopenia (XLT) or attenuated WAS [1–3]. More recently however novel activating mutations have been described that give rise to X-linked neutropenia (XLN), a third syndrome defined by neutropenia with variable myelodysplasia [4–6]. WASP is key in transducing signals from the cell surface to the actin cytoskeleton, and a lack of WASp results in cytoskeletal defects that compromise multiple aspects of normal cellular activity including proliferation, phagocytosis, immune synapse formation, adhesion and directed migration. Keywords: Wiskott-Aldrich syndrome, actin polymerization, lymphocytes, -
Vinculin Antibody Cat
Vinculin Antibody Cat. No.: 7809 Vinculin Antibody Figure 2 Western Blot Validation in Human, Mouse and Rat Cell Lines Figure 3 Western Blot Validation in PC3 Cell Lysate Loading: 15 μg of lysates per lane. Antibodies: Vinculin Loading: 15 μg of lysates per lane. Antibodies: Vinculin 7809 (1 μg/mL), 1h incubation at RT in 5% NFDM/TBST. 7809 (Lane 1: 0.5 μg/mL and Lane 2: 1 μg/mL), 1h Secondary: Goat anti-rabbit IgG HRP conjugate at 1:10000 incubation at RT in 5% NFDM/TBST. Secondary: Goat anti- dilution. rabbit IgG HRP conjugate at 1:10000 dilution. Figure 4 Immunocytochemistry Validation of Vinculin in Jurkat Cells Figure 5 Immunofluorescence Validation of Vinculin in Immunocytochemical analysis of Jurkat cells using anti- Jurkat Cells Vinculin antibody (7809) at 5 μg/ml. Cells was fixed with Immunofluorescent analysis of 4% paraformaldehyde- formaldehyde and blocked with 10% serum for 1 h at RT; fixed Jurkat cells labeling Vinculin with 7809 at 20 μg/mL, antigen retrieval was by heat mediation with a citrate followed by goat anti-rabbit IgG secondary antibody at buffer (pH6). Samples were incubated with primary 1/500 dilution (green) and DAPI staining (blue). antibody overnight at 4˚C. A goat anti-rabbit IgG H&L (HRP) at 1/250 was used as secondary. Counter stained with Hematoxylin. Specifications September 23, 2021 1 https://www.prosci-inc.com/vinculin-antibody-7809.html HOST SPECIES: Rabbit SPECIES REACTIVITY: Human, Mouse, Rat HOMOLOGY: Predicted species reactivity based on immunogen sequence: Pig: (100%) Anti-Vinculin antibody (7809) was raised against a peptide corresponding to 23 amino IMMUNOGEN: acids near the center of human Vinculin. -
How Microtubules Control Focal Adhesion Dynamics
JCB: Review Targeting and transport: How microtubules control focal adhesion dynamics Samantha Stehbens and Torsten Wittmann Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, CA 94143 Directional cell migration requires force generation that of integrin-mediated, nascent adhesions near the cell’s leading relies on the coordinated remodeling of interactions with edge, which either rapidly turn over or connect to the actin cytoskeleton (Parsons et al., 2010). Actomyosin-mediated the extracellular matrix (ECM), which is mediated by pulling forces allow a subset of these nascent FAs to grow integrin-based focal adhesions (FAs). Normal FA turn- and mature, and provide forward traction forces. However, in over requires dynamic microtubules, and three members order for cells to productively move forward, FAs also have to of the diverse group of microtubule plus-end-tracking release and disassemble underneath the cell body and in the proteins are principally involved in mediating micro- rear of the cell. Spatial and temporal control of turnover of tubule interactions with FAs. Microtubules also alter these mature FAs is important, as they provide a counterbalance to forward traction forces, and regulated FA disassembly is the assembly state of FAs by modulating Rho GTPase required for forward translocation of the cell body. An important signaling, and recent evidence suggests that microtubule- question that we are only beginning to understand is how FA mediated clathrin-dependent and -independent endo turnover is spatially and temporally regulated to allow cells cytosis regulates FA dynamics. In addition, FA-associated to appropriately respond to extracellular signals, allowing for microtubules may provide a polarized microtubule track for coordinated and productive movement. -
Catenin Controls Vinculin Binding
ARTICLE Received 4 Feb 2014 | Accepted 25 Jun 2014 | Published 31 Jul 2014 DOI: 10.1038/ncomms5525 Force-dependent conformational switch of a-catenin controls vinculin binding Mingxi Yao1,*, Wu Qiu2,3,*, Ruchuan Liu2,3, Artem K. Efremov1, Peiwen Cong1,4, Rima Seddiki5, Manon Payre5, Chwee Teck Lim1,6, Benoit Ladoux1,5,Rene´-Marc Me`ge5 & Jie Yan1,3,6,7 Force sensing at cadherin-mediated adhesions is critical for their proper function. a-Catenin, which links cadherins to actomyosin, has a crucial role in this mechanosensing process. It has been hypothesized that force promotes vinculin binding, although this has never been demonstrated. X-ray structure further suggests that a-catenin adopts a stable auto-inhibitory conformation that makes the vinculin-binding site inaccessible. Here, by stretching single a- catenin molecules using magnetic tweezers, we show that the subdomains MI vinculin- binding domain (VBD) to MIII unfold in three characteristic steps: a reversible step at B5pN and two non-equilibrium steps at 10–15 pN. 5 pN unfolding forces trigger vinculin binding to the MI domain in a 1:1 ratio with nanomolar affinity, preventing MI domain refolding after force is released. Our findings demonstrate that physiologically relevant forces reversibly unfurl a- catenin, activating vinculin binding, which then stabilizes a-catenin in its open conformation, transforming force into a sustainable biochemical signal. 1 Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore. 2 Department of Physics, National University of Singapore, Singapore 117542, Singapore. 3 College of Physics, Chongqing University, No. 55 Daxuecheng South Road, Chongqing 401331, China. 4 Singapore-MIT Alliance for Research and Technology, National University of Singapore, Singapore 117543, Singapore. -
A Unique and Specific Interaction Between Αt-Catenin and Plakophilin
2126 Research Article A unique and specific interaction between ␣T-catenin and plakophilin-2 in the area composita, the mixed-type junctional structure of cardiac intercalated discs Steven Goossens1,2,*, Barbara Janssens1,2,*,‡, Stefan Bonné1,2,§, Riet De Rycke1,2, Filip Braet1,2,¶, Jolanda van Hengel1,2 and Frans van Roy1,2,** 1Department for Molecular Biomedical Research, VIB and 2Department of Molecular Biology, Ghent University, B-9052 Ghent, Belgium *These authors contributed equally to this work ‡Present address: Wiley-VCH, Boschstrasse 12, D-69469 Weinheim, Germany §Present address: Diabetes Research Center, Brussels Free University (VUB), Laarbeeklaan 103, B-1090 Brussels, Belgium ¶Present address: Australian Key Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia **Author for correspondence (e-mail: [email protected]) Accepted 24 April 2007 Journal of Cell Science 120, 2126-2136 Published by The Company of Biologists 2007 doi:10.1242/jcs.004713 Summary Alpha-catenins play key functional roles in cadherin- desmosomal proteins in the heart localize not only to the catenin cell-cell adhesion complexes. We previously desmosomes in the intercalated discs but also at adhering reported on ␣T-catenin, a novel member of the ␣-catenin junctions with hybrid composition. We found that in the protein family. ␣T-catenin is expressed predominantly in latter junctions, endogenous plakophilin-2 colocalizes with cardiomyocytes, where it colocalizes with ␣E-catenin at the ␣T-catenin. By providing an extra link between the intercalated discs. Whether ␣T- and ␣E-catenin have cadherin-catenin complex and intermediate filaments, the specific or synergistic functions remains unknown. In this binding of ␣T-catenin to plakophilin-2 is proposed to be a study we used the yeast two-hybrid approach to identify means of modulating and strengthening cell-cell adhesion specific functions of ␣T-catenin. -
The Role of the Interaction of the Vinculin Proline-Rich Linker Region
ß 2014. Published by The Company of Biologists Ltd | Journal of Cell Science (2014) 127, 1875–1886 doi:10.1242/jcs.133645 RESEARCH ARTICLE The role of the interaction of the vinculin proline-rich linker region with vinexin a in sensing the stiffness of the extracellular matrix Hiroshi Yamashita1,*, Takafumi Ichikawa1,*, Daisuke Matsuyama1, Yasuhisa Kimura1, Kazumitsu Ueda1,2, Susan W. Craig3, Ichiro Harada4 and Noriyuki Kioka1,` ABSTRACT information into biochemical signals. At FAs, transmembrane ECM receptors, integrins, are connected to the ends of actin stress Although extracellular matrix (ECM) stiffness is an important aspect fibers through various cytoplasmic proteins, including talin and of the extracellular microenvironment and is known to direct the vinculin. Cells sense ECM stiffness by ‘pulling’ on the ECM lineage specification of stem cells and affect cancer progression, using actomyosin-generated intracellular tension through FAs and the molecular mechanisms that sense ECM stiffness have not yet adjusting the tension that they exert accordingly (Geiger et al., been elucidated. In this study, we show that the proline-rich linker 2009; Parsons et al., 2010); cells on rigid ECM exert higher (PRL) region of vinculin and the PRL-region-binding protein vinexin intracellular tension than cells on soft ECM. Although some FA are involved in sensing the stiffness of ECM substrates. A rigid proteins have been suggested to engage in sensing intracellular substrate increases the level of cytoskeleton-associated vinculin, tension (del Rio et al., 2009; Friedland et al., 2009; Sawada et al., and the fraction of vinculin stably localizing at focal adhesions (FAs) 2006), the signaling mechanisms by which cells sense ECM is larger on rigid ECM than on soft ECM. -
Vinculin Regulates Cell-Surface E-Cadherin Expression by Binding to -Catenin
Research Article 567 Vinculin regulates cell-surface E-cadherin expression by binding to -catenin Xiao Peng, Laura E. Cuff, Cort D. Lawton and Kris A. DeMali* Department of Biochemistry, University of Iowa Roy J. Carver College of Medicine, Iowa City, IA 52242, USA *Author for correspondence ([email protected]) Accepted 23 November 2009 Journal of Cell Science 123, 567-577 © 2010. Published by The Company of Biologists Ltd doi:10.1242/jcs.056432 Summary Vinculin was identified as a component of adherens junctions 30 years ago, yet its function there remains elusive. Deletion studies are consistent with the idea that vinculin is important for the organization of cell-cell junctions. However, this approach removes vinculin from both cell-matrix and cell-cell adhesions, making it impossible to distinguish its contribution at each site. To define the role of vinculin in cell-cell junctions, we established a powerful short hairpin-RNA-based knockdown/substitution model system that perturbs vinculin preferentially at sites of cell-cell adhesion. When this system was applied to epithelial cells, cell morphology was altered, and cadherin-dependent adhesion was reduced. These defects resulted from impaired E-cadherin cell-surface expression. We have investigated the mechanism for the effects of vinculin and found that the reduced surface E-cadherin expression could be rescued by introduction of vinculin, but not of a vinculin A50I substitution mutant that is defective for -catenin binding. These findings suggest that an interaction between -catenin and vinculin is crucial for stabilizing E-cadherin at the cell surface. This was confirmed by analyzing a -catenin mutant that fails to bind vinculin. -
The Relationship Between Intermediate Filaments and Microfilaments Before and During the Formation of Desmosomes and Adherens-Ty
Published May 1, 1987 The Relationship between Intermediate Filaments and Microfilaments before and during the Formation of Desmosomes and Adherens-type Junctions in Mouse Epidermal Keratinocytes Kathleen J. Green, Benjamin Geiger,* Jonathan C. R. Jones, John C. Talian, and Robert D. Goldman Department of Cell Biology and Anatomy, Northwestern University Medical School, Chicago, Illinois 60611; and * Department of Chemical Immunology, The Weizmann Institute of Science, Rehovot, Israel Abstract. Actin, keratin, vinculin and desmoplakin ermost of the concentric MFB. Individual IF often organization were studied in primary mouse keratino- splay out, becoming interwoven into these MFB in the cytes before and during Ca2+-induced cell contact forma- region of cell-substrate contact. In the first 30 min af- tion. Double-label fluorescence shows that in cells cul- ter the Ca 2+ switch, areas of submembranous dense Downloaded from tured in low Ca 2÷ medium, keratin-containing inter- material (identified as adherens junctions), which are mediate filament bundles (IFB) and desmoplakin- associated with the perpendicular MFB, can be seen at containing spots are both concentrated towards the cell newly formed cell-ceU contact sites. By 1-2 h, IFB- center in a region bounded by a series of concentric desmosomal component complexes are aligned with microfilament bundles (MFB). Within 5-30 min after the perpendicular MFB as the complexes become jcb.rupress.org raising Ca 2+ levels, a discontinuous actin/vinculin-rich, redistributed to cell-cell interfaces. Cytochalasin D submembranous zone of fluorescence appears at cell- treatment causes the redistribution of actin into numer- cell interfaces. This zone is usually associated with ous patches; keratin-containing Lr:B undergo a con- short, perpendicular MFB, which become wider and comitant redistribution, forming foci that coincide with longer with time. -
Non-Muscle Myosin 2A (NM2A): Structure, Regulation and Function
cells Review Non-Muscle Myosin 2A (NM2A): Structure, Regulation and Function Cláudia Brito 1,2 and Sandra Sousa 1,* 1 Group of Cell Biology of Bacterial Infections, i3S-Instituto de Investigação e Inovação em Saúde, IBMC, Universidade do Porto, 4200-135 Porto, Portugal; [email protected] 2 Programa Doutoral em Biologia Molecular e Celular (MCBiology), Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, 4099-002 Porto, Portugal * Correspondence: [email protected] Received: 19 May 2020; Accepted: 29 June 2020; Published: 1 July 2020 Abstract: Non-muscle myosin 2A (NM2A) is a motor cytoskeletal enzyme with crucial importance from the early stages of development until adulthood. Due to its capacity to convert chemical energy into force, NM2A powers the contraction of the actomyosin cytoskeleton, required for proper cell division, adhesion and migration, among other cellular functions. Although NM2A has been extensively studied, new findings revealed that a lot remains to be discovered concerning its spatiotemporal regulation in the intracellular environment. In recent years, new functions were attributed to NM2A and its activity was associated to a plethora of illnesses, including neurological disorders and infectious diseases. Here, we provide a concise overview on the current knowledge regarding the structure, the function and the regulation of NM2A. In addition, we recapitulate NM2A-associated diseases and discuss its potential as a therapeutic target. Keywords: non-muscle myosin 2A (NM2A); NM2A activity regulation; NM2A filament assembly; actomyosin cytoskeleton; cell migration; cell adhesion; plasma membrane blebbing 1. Superfamily of Myosins The cell cytoskeleton is an interconnected and dynamic network of filaments essential for intracellular organization and cell shape maintenance. -
Evidence for Rho Kinase Pathway
Oncogene (2001) 20, 2112 ± 2121 ã 2001 Nature Publishing Group All rights reserved 0950 ± 9232/01 $15.00 www.nature.com/onc Cytoskeletal organization in tropomyosin-mediated reversion of ras-transformation: Evidence for Rho kinase pathway Vanya Shah3, Shantaram Bharadwaj1,2, Kozo Kaibuchi4 and GL Prasad*,1,2 1Department of General Surgery, Wake Forest University School of Medicine, Winston-Salem, North Carolina, NC 27157, USA; 2Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, NC 27157, USA; 3Wistar Institute of Anatomy and Cell Biology, Philadelphia, Pennsylvania, USA; 4Nara Institute of Science and Technology Ikoma, Japan Tropomyosin (TM) family of cytoskeletal proteins is and tropomyosins (TMs) are suppressed to varying implicated in stabilizing actin micro®laments. Many TM degrees in many transformed cells (Ben-Ze'ev, 1997). isoforms, including tropomyosin-1 (TM1), are down- Furthermore, restoration of these proteins inhibits the regulated in transformed cells. Previously we demon- malignant phenotype of many dierent experimentally strated that TM1 is a suppressor of the malignant transformed cell lines, underscoring the pivotal role of transformation, and that TM1 reorganizes micro®la- cytoskeletal organization in maintaining a normal ments in the transformed cells. To investigate how TM1 phenotype (Ayscough, 1998; Janmey and Chaponnier, induces micro®lament organization in transformed cells, 1995). Our laboratory has been interested in under- we utilized ras-transformed NIH3T3 (DT) cells, and standing the role of cytoskeletal proteins, in particular those transduced to express TM1, and/or TM2. that of tropomyosins, in malignant transformation. Enhanced expression of TM1 alone, but not TM2, Tropomyosin (TM) family comprises of 5 ± 7 results in re-emergence of micro®laments; TM1, together dierent closely related isoforms, whose expression is with TM2 remarkably improves micro®lament architec- altered in many transformed cells (Lin et al., 1997; ture. -
Talin-1 Is the Principal Platelet Rap1 Effector of Integrin Activation
Regular Article PLATELETS AND THROMBOPOIESIS Talin-1 is the principal platelet Rap1 effector of integrin activation 1,2, 3,4, 1, 1 1 1 1 Frederic Lagarrigue, * David S. Paul, * Alexandre R. Gingras, * Andrew J. Valadez, Hao Sun, Jenny Lin, Monica N. Cuevas, Downloaded from http://ashpublications.org/blood/article-pdf/136/10/1180/1756644/bloodbld2020005348.pdf by UNIV OF NC/ACQ SRVCS user on 20 October 2020 Jailal N. Ablack,1 Miguel Alejandro Lopez-Ramirez,1,5 Wolfgang Bergmeier,3,4 and Mark H. Ginsberg1 1Department of Medicine, University of California, San Diego, La Jolla, CA; 2Institut de Pharmacologie et de Biologie Structurale (IPBS), Centre National de la Recherche Scientifique (CNRS), Universite´ Paul Sabatier (UPS), Universite´ de Toulouse, Toulouse, France; 3UNC Blood Research Center and 4Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC; and 5Department of Pharmacology, University of California, San Diego, La Jolla, CA KEY POINTS Ras-related protein 1 (Rap1) is a major convergence point of the platelet-signaling path- ways that result in talin-1 binding to the integrin b cytoplasmic domain and consequent l Blockade of Rap1 binding to talin-1 F0 integrin activation, platelet aggregation, and effective hemostasis. The nature of the and F1 domains connection between Rap1 and talin-1 in integrin activation is an important remaining gap in phenocopies the our understanding of this process. Previous work identified a low-affinity Rap1-binding site defects in integrin in the talin-1 F0 domain that makes a small contribution to integrin activation in platelets. activation observed in platelets lacking We recently identified an additional Rap1-binding site in the talin-1 F1 domain that makes a Rap1a/b. -
Snapshot: Actin Regulators II Anosha D
SnapShot: Actin Regulators II Anosha D. Siripala and Matthew D. Welch Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA Representative Proteins Protein Family H. sapiens D. melanogaster C. elegans A. thaliana S. cerevisiae Endocytosis and Exocytosis ABP1/drebrin mABP1, drebrin, drebrin- †Q95RN0 †Q9XUT0 Abp1 like EPS15 EPS15 Eps-15 EHS-1 †Q56WL2 Pan1 HIP1R HIP1R †Q8MQK1 †O62142 Sla2 Synapsin synapsin Ia, Ib, IIa, IIb, III Synapsin SNN-1 Plasma Membrane Association Anillin anillin Scraps ANI-1, 2, 3 Annexins annexin A1–11, 13 (actin Annexin B9-11 NEX-1–4 ANN1-8 binding: 1, 2, 6) ERM proteins ezrin, radixin, moesin DMoesin ERM-1 MARCKS MARCKS, MRP/ Akap200 MACMARCKS/F52 Merlin *merlin/NF2 Merlin NFM-1 Protein 4.1 4.1R, G, N, B Coracle Spectrin α-spectrin (1–2), β-spectrin α-spectrin, β-spectrin, β heavy- SPC-1 (α-spectrin), UNC-70 (1–4), β heavy-spectrin/ spectrin/Karst (β-spectrin), SMA-1 (β heavy- karst spectrin) Identifi ed Cellular Role: X Membrane traffi cking and phagocytosis Cell-Cell Junctions X Cytokinesis α-catenin α-catenin 1–3 α-catenin HMP-1 X Cell surface organization and dynamics X Cell adhesion Afadin afadin/AF6 Canoe AFD-1 X Multiple functions ZO-1 ZO-1, ZO-2, ZO-3 ZO-1/Polychaetoid †Q56VX4 X Other/unknown Cell-Extracellular Matrix Junctions †UNIPROT database accession number *Mutation linked to human disease Dystrophin/utrophin *dystrophin, utrophin/ Dystrophin DYS-1 DRP1, DRP2 LASP LASP-1, LASP-2, LIM- Lasp †P34416 nebulette Palladin palladin Parvin α-, β-, χ-parvin †Q9VWD0 PAT-6