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Nguyen H, Podolnikova NP, Ugarova TP, Wang X. α MI-domain of integrin Mac-1 binds the cytokine pleiotrophin using multiple mechanisms. Structure 2024:S0969-2126(24)00139-4. [PMID: 38729161 DOI: 10.1016/j.str.2024.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 03/21/2024] [Accepted: 04/15/2024] [Indexed: 05/12/2024]
Abstract
The integrin Mac-1 (αMβ2, CD11b/CD18, CR3) is an adhesion receptor expressed on macrophages and neutrophils. Mac-1 is also a promiscuous integrin that binds a diverse set of ligands through its αMI-domain. However, the binding mechanism of most ligands remains unclear. We have characterized the interaction of αMI-domain with the cytokine pleiotrophin (PTN), a protein known to bind αMI-domain and induce Mac-1-mediated cell adhesion and migration. Our data show that PTN's N-terminal domain binds a unique site near the N- and C-termini of the αMI-domain using a metal-independent mechanism. However, a stronger interaction is achieved when an acidic amino acid in a zwitterionic motif in PTN's C-terminal domain chelates the divalent cation in the metal ion-dependent adhesion site of active αMI-domain. These results indicate that αMI-domain can bind ligands using multiple mechanisms and that the active αMI-domain has a preference for motifs containing both positively and negatively charged amino acids.
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Affiliation(s)
- Hoa Nguyen
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85281, USA
| | | | - Tatiana P Ugarova
- School of Life Sciences, Arizona State University, Tempe, AZ 85281, USA
| | - Xu Wang
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85281, USA.
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2
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Nguyen H, Podolnikova NP, Ugarova TP, Wang X. α MI-domain of Integrin Mac-1 Binds the Cytokine Pleiotrophin Using Multiple Mechanisms. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.01.578455. [PMID: 38352421 PMCID: PMC10862807 DOI: 10.1101/2024.02.01.578455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
The integrin Mac-1 (αMβ2, CD11b/CD18, CR3) is an important adhesion receptor expressed on macrophages and neutrophils. Mac-1 is also the most promiscuous member of the integrin family that binds a diverse set of ligands through its αMI-domain. However, the binding mechanism of most ligands is not clear. We have determined the interaction of αMI-domain with the cytokine pleiotrophin (PTN), a cationic protein known to bind αMI-domain and induce Mac-1-mediated cell adhesion and migration. Our data show that PTN's N-terminal domain binds a unique site near the N- and C-termini of the αMI-domain using a metal-independent mechanism. However, stronger interaction is achieved when an acidic amino acid in a zwitterionic motif in PTN's C-terminal domain chelates the divalent cation in the metal ion-dependent adhesion site of the active αMI-domain. These results indicate that αMI-domain can bind ligands using multiple mechanisms, and suggest that active αMI-domain prefers acidic amino acids in zwitterionic motifs.
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Affiliation(s)
- Hoa Nguyen
- School of Molecular Sciences, Arizona State University, Tempe, Arizona
| | | | | | - Xu Wang
- School of Molecular Sciences, Arizona State University, Tempe, Arizona
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3
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Heterotropic roles of divalent cations in the establishment of allostery and affinity maturation of integrin αXβ2. Cell Rep 2022; 40:111254. [PMID: 36001965 PMCID: PMC9440770 DOI: 10.1016/j.celrep.2022.111254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 05/23/2022] [Accepted: 08/02/2022] [Indexed: 11/21/2022] Open
Abstract
Allosteric activation and silencing of leukocyte β2-integrins transpire through cation-dependent structural changes, which mediate integrin biosynthesis and recycling, and are essential to designing leukocyte-specific drugs. Stepwise addition of Mg2+ reveals two mutually coupled events for the αXβ2 ligand-binding domain-the αX I-domain-corresponding to allostery establishment and affinity maturation. Electrostatic alterations in the Mg2+-binding site establish long-range couplings, leading to both pH- and Mg2+-occupancy-dependent biphasic stability change in the αX I-domain fold. The ligand-binding sensorgrams show composite affinity events for the αX I-domain accounting for the multiplicity of the αX I-domain conformational states existing in the solution. On cell surfaces, increasing Mg2+ concentration enhanced adhesiveness of αXβ2. This work highlights how intrinsically flexible pH- and cation-sensitive architecture endows a unique dynamic continuum to the αI-domain structure on the intact integrin, thereby revealing the importance of allostery establishment and affinity maturation in both extracellular and intracellular integrin events.
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4
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Activation of TRPV1 by capsaicin-loaded CaCO3 nanoparticle for tumor-specific therapy. Biomaterials 2022; 284:121520. [DOI: 10.1016/j.biomaterials.2022.121520] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/21/2022] [Accepted: 04/09/2022] [Indexed: 01/07/2023]
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5
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Lötscher J, Martí I Líndez AA, Kirchhammer N, Cribioli E, Giordano Attianese GMP, Trefny MP, Lenz M, Rothschild SI, Strati P, Künzli M, Lotter C, Schenk SH, Dehio P, Löliger J, Litzler L, Schreiner D, Koch V, Page N, Lee D, Grählert J, Kuzmin D, Burgener AV, Merkler D, Pless M, Balmer ML, Reith W, Huwyler J, Irving M, King CG, Zippelius A, Hess C. Magnesium sensing via LFA-1 regulates CD8 + T cell effector function. Cell 2022; 185:585-602.e29. [PMID: 35051368 DOI: 10.1016/j.cell.2021.12.039] [Citation(s) in RCA: 74] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 11/15/2021] [Accepted: 12/22/2021] [Indexed: 12/13/2022]
Abstract
The relevance of extracellular magnesium in cellular immunity remains largely unknown. Here, we show that the co-stimulatory cell-surface molecule LFA-1 requires magnesium to adopt its active conformation on CD8+ T cells, thereby augmenting calcium flux, signal transduction, metabolic reprogramming, immune synapse formation, and, as a consequence, specific cytotoxicity. Accordingly, magnesium-sufficiency sensed via LFA-1 translated to the superior performance of pathogen- and tumor-specific T cells, enhanced effectiveness of bi-specific T cell engaging antibodies, and improved CAR T cell function. Clinically, low serum magnesium levels were associated with more rapid disease progression and shorter overall survival in CAR T cell and immune checkpoint antibody-treated patients. LFA-1 thus directly incorporates information on the composition of the microenvironment as a determinant of outside-in signaling activity. These findings conceptually link co-stimulation and nutrient sensing and point to the magnesium-LFA-1 axis as a therapeutically amenable biologic system.
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Affiliation(s)
- Jonas Lötscher
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Adrià-Arnau Martí I Líndez
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland; Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland; Department of Medicine, CITIID, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge CB2 0AW, UK
| | - Nicole Kirchhammer
- Department of Biomedicine, Cancer Immunology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Elisabetta Cribioli
- Ludwig Institute for Cancer Research, University of Lausanne, 1066 Epalinges, Switzerland; Department of Oncology, University Hospital of Lausanne, 1011 Lausanne, Switzerland
| | - Greta Maria Paola Giordano Attianese
- Ludwig Institute for Cancer Research, University of Lausanne, 1066 Epalinges, Switzerland; Department of Oncology, University Hospital of Lausanne, 1011 Lausanne, Switzerland
| | - Marcel P Trefny
- Department of Biomedicine, Cancer Immunology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Markus Lenz
- University of Applied Science Northwestern Switzerland, Institute for Ecopreneurship, 4132 Muttenz, Switzerland
| | - Sacha I Rothschild
- Division of Medical Oncology and Comprehensive Cancer Center, University Hospital Basel, 4031 Basel, Switzerland; Swiss Group for Clinical Cancer Research, 3008 Bern, Switzerland
| | - Paolo Strati
- Department of Lymphoma and Myeloma, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Marco Künzli
- Department of Biomedicine, Immune Cell Biology, University and University Hospital of Basel, 4031 Basel, Switzerland
| | - Claudia Lotter
- Department of Pharmaceutical Sciences, Pharmaceutical Technology, University of Basel, 4056 Basel, Switzerland
| | - Susanne H Schenk
- Department of Pharmaceutical Sciences, Pharmaceutical Technology, University of Basel, 4056 Basel, Switzerland
| | - Philippe Dehio
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Jordan Löliger
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Ludivine Litzler
- Department of Biomedicine, Immune Cell Biology, University and University Hospital of Basel, 4031 Basel, Switzerland
| | - David Schreiner
- Department of Biomedicine, Immune Cell Biology, University and University Hospital of Basel, 4031 Basel, Switzerland
| | - Victoria Koch
- Department of Biomedicine, Cancer Immunology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Nicolas Page
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Dahye Lee
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Jasmin Grählert
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Dmitry Kuzmin
- Hornet Therapeutics Ltd, London SW1Y 5ES, UK; Department of Medical Oncology, Yale School of Medicine, New Haven, CT 06510, USA
| | - Anne-Valérie Burgener
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland
| | - Doron Merkler
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Miklos Pless
- Swiss Group for Clinical Cancer Research, 3008 Bern, Switzerland; Department of Oncology, Cantonal Hospital Winterthur, 8400 Winterthur, Switzerland
| | - Maria L Balmer
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland; Department for Biomedical Research (DBMR), University Clinic for Diabetes, Endocrinology, Clinical Nutrition and Metabolism, Inselspital, University of Bern, 3008 Bern, Switzerland; Diabetes Center Berne (DCB), 3010 Bern, Switzerland
| | - Walter Reith
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland
| | - Jörg Huwyler
- Department of Pharmaceutical Sciences, Pharmaceutical Technology, University of Basel, 4056 Basel, Switzerland
| | - Melita Irving
- Ludwig Institute for Cancer Research, University of Lausanne, 1066 Epalinges, Switzerland; Department of Oncology, University Hospital of Lausanne, 1011 Lausanne, Switzerland
| | - Carolyn G King
- Department of Biomedicine, Immune Cell Biology, University and University Hospital of Basel, 4031 Basel, Switzerland
| | - Alfred Zippelius
- Department of Biomedicine, Cancer Immunology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland; Division of Medical Oncology and Comprehensive Cancer Center, University Hospital Basel, 4031 Basel, Switzerland
| | - Christoph Hess
- Department of Biomedicine, Immunobiology, University of Basel and University Hospital of Basel, 4031 Basel, Switzerland; Department of Medicine, CITIID, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge CB2 0AW, UK.
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6
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Baek J, Cho Y, Park HJ, Choi G, Lee JS, Lee M, Yu SJ, Cho SW, Lee E, Im SG. A Surface-Tailoring Method for Rapid Non-Thermosensitive Cell-Sheet Engineering via Functional Polymer Coatings. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1907225. [PMID: 32157771 DOI: 10.1002/adma.201907225] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 12/30/2019] [Accepted: 02/18/2020] [Indexed: 06/10/2023]
Abstract
Cell sheet engineering, a technique utilizing a monolayer cell sheet, has recently emerged as a promising technology for scaffold-free tissue engineering. In contrast to conventional tissue-engineering approaches, the cell sheet technology allows cell harvest as a continuous cell sheet with intact extracellular matrix proteins and cell-cell junction, which facilitates cell transplantation without any other artificial biomaterials. A facile, non-thermoresponsive method is demonstrated for a rapid but highly reliable platform for cell-sheet engineering. The developed method exploits the precise modulation of cell-substrate interactions by controlling the surface energy of the substrate via a series of functional polymer coatings to enable prompt cell sheet harvesting within 100 s. The engineered surface can trigger an intrinsic cellular response upon the depletion of divalent cations, leading to spontaneous cell sheet detachment under physiological conditions (pH 7.4 and 37 °C) in a non-thermoresponsive manner. Additionally, the therapeutic potential of the cell sheet is successfully demonstrated by the transplantation of multilayered cell sheets into mouse models of diabetic wounds and ischemia. These findings highlight the ability of the developed surface for non-thermoresponsive cell sheet engineering to serve as a robust platform for regenerative medicine and provide significant breakthroughs in cell sheet technology.
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Affiliation(s)
- Jieung Baek
- Department of Chemical and Biomolecular Engineering and KI for NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Younghak Cho
- Department of Chemical and Biomolecular Engineering and KI for NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Hyun-Ji Park
- Department of Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
| | - Goro Choi
- Department of Chemical and Biomolecular Engineering and KI for NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Jong Seung Lee
- Department of Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
| | - Minseok Lee
- Department of Chemical and Biomolecular Engineering and KI for NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Seung Jung Yu
- Department of Chemical and Biomolecular Engineering and KI for NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Seung-Woo Cho
- Department of Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
- Center for Nanomedicine, Institute for Basic Science (IBS), Seoul, 03772, Republic of Korea
- Yonsei-IBS Institute, Yonsei University, Seoul, 03722, Republic of Korea
| | - Eunjung Lee
- Department of Chemical and Biomolecular Engineering and KI for NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Sung Gap Im
- Department of Chemical and Biomolecular Engineering and KI for NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
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7
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Berry KN, Brett TJ. Structural and Biophysical Analysis of the CLCA1 VWA Domain Suggests Mode of TMEM16A Engagement. Cell Rep 2020; 30:1141-1151.e3. [PMID: 31995732 PMCID: PMC7050472 DOI: 10.1016/j.celrep.2019.12.059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/14/2019] [Accepted: 12/16/2019] [Indexed: 01/09/2023] Open
Abstract
The secreted protein calcium-activated chloride channel regulator 1 (CLCA1) utilizes a von Willebrand factor type A (VWA) domain to bind to and potentiate the calcium-activated chloride channel TMEM16A. To gain insight into this unique potentiation mechanism, we determined the 2.0-Å crystal structure of human CLCA1 VWA bound to Ca2+. The structure reveals the metal-ion-dependent adhesion site (MIDAS) in a high-affinity "open" conformation, engaging in crystal contacts that likely mimic how CLCA1 engages TMEM16A. The CLCA1 VWA contains a disulfide bond between α3 and α4 in close proximity to the MIDAS that is invariant in the CLCA family and unique in VWA structures. Further biophysical studies indicate that CLCA1 VWA is preferably stabilized by Mg2+ over Ca2+ and that α6 atypically extends from the VWA core. Finally, an analysis of TMEM16A structures suggests residues likely to mediate interaction with CLCA1 VWA.
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Affiliation(s)
- Kayla N Berry
- Immunology Program and Medical Scientist Training Program, Washington University School of Medicine, St. Louis, MO 63110, USA; Department of Internal Medicine, Division of Pulmonary and Critical Care, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Tom J Brett
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Washington University School of Medicine, St. Louis, MO 63110, USA; Center for the Investigation of Membrane Excitability Diseases (CIMED), Washington University School of Medicine, St. Louis, MO 63110, USA; Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110, USA; Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110, USA.
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8
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Juul-Madsen K, Qvist P, Bendtsen KL, Langkilde AE, Vestergaard B, Howard KA, Dehesa-Etxebeste M, Paludan SR, Andersen GR, Jensen PH, Otzen DE, Romero-Ramos M, Vorup-Jensen T. Size-Selective Phagocytic Clearance of Fibrillar α-Synuclein through Conformational Activation of Complement Receptor 4. THE JOURNAL OF IMMUNOLOGY 2020; 204:1345-1361. [PMID: 31969389 DOI: 10.4049/jimmunol.1900494] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 12/18/2019] [Indexed: 12/19/2022]
Abstract
Aggregation of α-synuclein (αSN) is an important histological feature of Parkinson disease. Recent studies showed that the release of misfolded αSN from human and rodent neurons is relevant to the progression and spread of αSN pathology. Little is known, however, about the mechanisms responsible for clearance of extracellular αSN. This study found that human complement receptor (CR) 4 selectively bound fibrillar αSN, but not monomeric species. αSN is an abundant protein in the CNS, which potentially could overwhelm clearance of cytotoxic αSN species. The selectivity of CR4 toward binding fibrillar αSN consequently adds an important αSN receptor function for maintenance of brain homeostasis. Based on the recently solved structures of αSN fibrils and the known ligand preference of CR4, we hypothesize that the parallel monomer stacking in fibrillar αSN creates a known danger-associated molecular pattern of stretches of anionic side chains strongly bound by CR4. Conformational change in the receptor regulated tightly clearance of fibrillar αSN by human monocytes. The induced change coupled concomitantly with phagolysosome formation. Data mining of the brain transcriptome in Parkinson disease patients supported CR4 as an active αSN clearance mechanism in this disease. Our results associate an important part of the innate immune system, namely complement receptors, with the central molecular mechanisms of CNS protein aggregation in neurodegenerative disorders.
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Affiliation(s)
- Kristian Juul-Madsen
- Biophysical Immunology Laboratory, Aarhus University, DK-8000 Aarhus C, Denmark.,Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Per Qvist
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Aarhus University, DK-8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Kirstine L Bendtsen
- Department of Drug Design and Pharmacology, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
| | - Annette E Langkilde
- Department of Drug Design and Pharmacology, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
| | - Bente Vestergaard
- Department of Drug Design and Pharmacology, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
| | - Kenneth A Howard
- Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Martxel Dehesa-Etxebeste
- Neuroscience Area, Biodonostia Research Institute, 20014 Donostia, San Sebastian, Spain.,CIBERNED, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Søren R Paludan
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Gregers Rom Andersen
- Department of Molecular Biology and Genetics, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Poul Henning Jensen
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark.,DANDRITE-Danish Research Institute of Translational Neuroscience, Aarhus University, DK-8000 Aarhus C, Denmark; and
| | - Daniel E Otzen
- Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Marina Romero-Ramos
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark.,DANDRITE-Danish Research Institute of Translational Neuroscience, Aarhus University, DK-8000 Aarhus C, Denmark; and.,NEURODIN AU IDEAS Center, Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Thomas Vorup-Jensen
- Biophysical Immunology Laboratory, Aarhus University, DK-8000 Aarhus C, Denmark; .,Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark.,Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Aarhus C, Denmark.,NEURODIN AU IDEAS Center, Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
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9
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Liu W, Wang X, Wang S, Ba X, Xu T, Wang X, Zeng X. RhoGDI2 positively regulates the Rho GTPases activation in response to the β2 outside-in signaling in T cells adhesion and migration on ICAM-1. J Leukoc Biol 2019; 106:431-446. [PMID: 31075185 DOI: 10.1002/jlb.2a0718-272rr] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Revised: 04/25/2019] [Accepted: 04/30/2019] [Indexed: 01/08/2023] Open
Abstract
Cytoskeletal reorganization driven by Rho GTPases plays a crucial role in the migration of T cells, which are key regulators of immunity. The molecular mechanisms that control actin cytoskeleton remodeling during T cell movement have only partially been clarified as the function of many modulators has not been evaluated in these cells. Here, we report a new function of RhoGDI2 by showing that this protein positively regulates Rho GTPase activation during T cell adhesion and migration. RhoGDI2 knockdown significantly reduced T cell adhesion and migration. Furthermore, RhoGDI2 knockdown decreased the activation of Rac1 and Cdc42, 2 members of Rho GTPases, and the remodeling of the actin cytoskeleton. Upon P-selectin glycoprotein ligand-1 engagement, RhoGDI2 was phosphorylated at Y24 and Y153 by kinases related to β2 integrin outside-in signaling, Src, c-Abl, and Syk, resulting in the accumulation of RhoGDI2 at the cell membrane. Subsequent phosphorylation of S31 induced the opening of RhoGDI2 and the release of Rho GTPases, whereas phosphorylation of Y153 might promote the activation of Rho GTPases by recruiting Vav1. Moreover, the disruption of lipid rafts with methyl-β-cyclodextrin blocked the interaction between integrins and RhoGDI2, reducing the level of phosphorylated RhoGDI2 and the activation of downstream Rho GTPases. Based on these observations, RhoGDI2 is a target of intergrin outside-in signaling that activates Rho GTPases during T cell adhesion and migration, and RhoGDI2-mediated signal transduction is based on the lipid rafts integrity.
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Affiliation(s)
- Wenai Liu
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Xuehao Wang
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Shan Wang
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Xueqing Ba
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Tingshuang Xu
- Department of Rheumatology and Immunology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Xiaoguang Wang
- Department of Bioscience, Changchun Normal University, Changchun, Jilin, China
| | - Xianlu Zeng
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
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10
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Wu XY, Zhao Q, Zhang DX, Liang YC, Zhang KK, Liu Q, Dong L, Shan CX. A self-calibrated luminescent thermometer based on nanodiamond-Eu/Tb hybrid materials. Dalton Trans 2019; 48:7910-7917. [DOI: 10.1039/c9dt00850k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ND-PMA-RE was synthesized and the ND-PMA-Eu/Tb could be served as a self-referencing luminescent thermometer due to the temperature-dependent luminescence performance.
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Affiliation(s)
- Xue-Ying Wu
- Henan Key Laboratory of Diamond Optoelectronic Materials and Devices
- School of Physics and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Qi Zhao
- Henan Key Laboratory of Diamond Optoelectronic Materials and Devices
- School of Physics and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Dong-Xue Zhang
- Henan Key Laboratory of Diamond Optoelectronic Materials and Devices
- School of Physics and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Ya-Chuan Liang
- Henan Key Laboratory of Diamond Optoelectronic Materials and Devices
- School of Physics and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Kui-Kui Zhang
- Henan Key Laboratory of Diamond Optoelectronic Materials and Devices
- School of Physics and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Qian Liu
- Henan Key Laboratory of Diamond Optoelectronic Materials and Devices
- School of Physics and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Lin Dong
- Henan Key Laboratory of Diamond Optoelectronic Materials and Devices
- School of Physics and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Chong-Xin Shan
- Henan Key Laboratory of Diamond Optoelectronic Materials and Devices
- School of Physics and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
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11
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Vorup-Jensen T, Jensen RK. Structural Immunology of Complement Receptors 3 and 4. Front Immunol 2018; 9:2716. [PMID: 30534123 PMCID: PMC6275225 DOI: 10.3389/fimmu.2018.02716] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 11/05/2018] [Indexed: 01/10/2023] Open
Abstract
Complement receptors (CR) 3 and 4 belong to the family of beta-2 (CD18) integrins. CR3 and CR4 are often co-expressed in the myeloid subsets of leukocytes, but they are also found in NK cells and activated T and B lymphocytes. The heterodimeric ectodomain undergoes considerable conformational change in order to switch the receptor from a structurally bent, ligand-binding in-active state into an extended, ligand-binding active state. CR3 binds the C3d fragment of C3 in a way permitting CR2 also to bind concomitantly. This enables a hand-over of complement-opsonized antigens from the cell surface of CR3-expressing macrophages to the CR2-expressing B lymphocytes, in consequence acting as an antigen presentation mechanism. As a more enigmatic part of their functions, both CR3 and CR4 bind several structurally unrelated proteins, engineered peptides, and glycosaminoglycans. No consensus motif in the proteinaceous ligands has been established. Yet, the experimental evidence clearly suggest that the ligands are primarily, if not entirely, recognized by a single site within the receptors, namely the metal-ion dependent adhesion site (MIDAS). Comparison of some recent identified ligands points to CR3 as inclined to bind positively charged species, while CR4, by contrast, binds strongly negative-charged species, in both cases with the critical involvement of deprotonated, acidic groups as ligands for the Mg2+ ion in the MIDAS. These properties place CR3 and CR4 firmly within the realm of modern molecular medicine in several ways. The expression of CR3 and CR4 in NK cells was recently demonstrated to enable complement-dependent cell cytotoxicity toward antibody-coated cancer cells as part of biological therapy, constituting a significant part of the efficacy of such treatment. With the flexible principles of ligand recognition, it is also possible to propose a response of CR3 and CR4 to existing medicines thereby opening a possibility of drug repurposing to influence the function of these receptors. Here, from advances in the structural and cellular immunology of CR3 and CR4, we review insights on their biochemistry and functions in the immune system.
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Affiliation(s)
- Thomas Vorup-Jensen
- Biophysical Immunology Laboratory, Department of Biomedicine, Aarhus University, Aarhus, Denmark.,Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark
| | - Rasmus Kjeldsen Jensen
- Department of Molecular Biology and Genetics-Structural Biology, Aarhus University, Aarhus, Denmark
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12
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Kawahara R, Niwa Y, Simizu S. Integrin β1 is an essential factor in vasculogenic mimicry of human cancer cells. Cancer Sci 2018; 109:2490-2496. [PMID: 29900640 PMCID: PMC6113431 DOI: 10.1111/cas.13693] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 06/01/2018] [Accepted: 06/08/2018] [Indexed: 12/16/2022] Open
Abstract
Vasculogenic mimicry (VM) formation by cancer cells is known to play a crucial role in tumor progression, but its detailed mechanism is unclear. In the present study, we focused on integrin β1 (ITGB1) and assessed the role of ITGB1 in VM formation. We used in vitro methods to seed cancer cells on Matrigel to evaluate the capability of VM formation. We carried out ITGB1 gene deletion using the CRISPR/Cas9 system, and these ITGB1‐knockout cells did not show a VM‐like network formation. Further, reintroduction of ITGB1 rescued VM‐like network formation in ITGB1‐knockout cells. In conclusion, ITGB1 is a critical factor in VM of human cancer cells, and inhibition of ITGB1 may be a novel therapeutic approach for malignant cancer.
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Affiliation(s)
- Ryota Kawahara
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Japan
| | - Yuki Niwa
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Japan
| | - Siro Simizu
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Japan
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13
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Briot J, Mailhot O, Bourdin B, Tétreault MP, Najmanovich R, Parent L. A three-way inter-molecular network accounts for the Ca Vα2δ1-induced functional modulation of the pore-forming Ca V1.2 subunit. J Biol Chem 2018; 293:7176-7188. [PMID: 29588365 DOI: 10.1074/jbc.ra118.001902] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 03/09/2018] [Indexed: 12/17/2022] Open
Abstract
L-type CaV1.2 channels are essential for the excitation-contraction coupling in cardiomyocytes and are hetero-oligomers of a pore-forming CaVα1C assembled with CaVβ and CaVα2δ1 subunits. A direct interaction between CaVα2δ1 and Asp-181 in the first extracellular loop of CaVα1 reproduces the native properties of the channel. A 3D model of the von Willebrand factor type A (VWA) domain of CaVα2δ1 complexed with the voltage sensor domain of CaVα1C suggests that Ser-261 and Ser-263 residues in the metal ion-dependent adhesion site (MIDAS) motif are determinant in this interaction, but this hypothesis is untested. Here, coimmunoprecipitation assays and patch-clamp experiments of single-substitution variants revealed that CaVα2δ1 Asp-259 and Ser-261 are the two most important residues in regard to protein interactions and modulation of CaV1.2 currents. In contrast, mutating the side chains of CaVα2δ1 Ser-263, Thr-331, and Asp-363 with alanine did not completely prevent channel function. Molecular dynamics simulations indicated that the carboxylate side chain of CaVα2δ1 Asp-259 coordinates the divalent cation that is further stabilized by the oxygen atoms from the hydroxyl side chain of CaVα2δ1 Ser-261 and the carboxylate group of CaVα1C Asp-181. In return, the hydrogen atoms contributed by the side chain of Ser-261 and the main chain of Ser-263 bonded the oxygen atoms of CaV1.2 Asp-181. We propose that CaVα2δ1 Asp-259 promotes Ca2+ binding necessary to produce the conformation of the VWA domain that locks CaVα2δ1 Ser-261 and Ser-263 within atomic distance of CaVα1C Asp-181. This three-way network appears to account for the CaVα2δ1-induced modulation of CaV1.2 currents.
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Affiliation(s)
- Julie Briot
- Départements de Pharmacologie et Physiologie, Faculté de Médecine, Montréal, Québec H1T 1C8, Canada; Centre de Recherche de l'Institut de Cardiologie de Montréal, Université de Montréal, Montréal, Québec H1T 1C8, Canada
| | - Olivier Mailhot
- Départements de Pharmacologie et Physiologie, Faculté de Médecine, Montréal, Québec H1T 1C8, Canada; Biochimie et Médecine Moléculaire, Faculté de Médecine, Montréal, Québec H1T 1C8, Canada
| | - Benoîte Bourdin
- Centre de Recherche de l'Institut de Cardiologie de Montréal, Université de Montréal, Montréal, Québec H1T 1C8, Canada
| | - Marie-Philippe Tétreault
- Centre de Recherche de l'Institut de Cardiologie de Montréal, Université de Montréal, Montréal, Québec H1T 1C8, Canada
| | - Rafael Najmanovich
- Départements de Pharmacologie et Physiologie, Faculté de Médecine, Montréal, Québec H1T 1C8, Canada
| | - Lucie Parent
- Départements de Pharmacologie et Physiologie, Faculté de Médecine, Montréal, Québec H1T 1C8, Canada; Centre de Recherche de l'Institut de Cardiologie de Montréal, Université de Montréal, Montréal, Québec H1T 1C8, Canada.
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14
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Brown KL, Banerjee S, Feigley A, Abe H, Blackwell TS, Pozzi A, Hudson BG, Zent R. Salt-bridge modulates differential calcium-mediated ligand binding to integrin α1- and α2-I domains. Sci Rep 2018; 8:2916. [PMID: 29440721 PMCID: PMC5811549 DOI: 10.1038/s41598-018-21231-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 01/31/2018] [Indexed: 11/11/2022] Open
Abstract
Integrins are transmembrane cell-extracellular matrix adhesion receptors that impact many cellular functions. A subgroup of integrins contain an inserted (I) domain within the α–subunits (αI) that mediate ligand recognition where function is contingent on binding a divalent cation at the metal ion dependent adhesion site (MIDAS). Ca2+ is reported to promote α1I but inhibit α2I ligand binding. We co-crystallized individual I-domains with MIDAS-bound Ca2+ and report structures at 1.4 and 2.15 Å resolution, respectively. Both structures are in the “closed” ligand binding conformation where Ca2+ induces minimal global structural changes. Comparisons with Mg2+-bound structures reveal Mg2+ and Ca2+ bind α1I in a manner sufficient to promote ligand binding. In contrast, Ca2+ is displaced in the α2I domain MIDAS by 1.4 Å relative to Mg2+ and unable to directly coordinate all MIDAS residues. We identified an E152-R192 salt bridge hypothesized to limit the flexibility of the α2I MIDAS, thus, reducing Ca2+ binding. A α2I E152A construct resulted in a 10,000-fold increase in Mg2+ and Ca2+ binding affinity while increasing binding to collagen ligands 20%. These data indicate the E152-R192 salt bridge is a key distinction in the molecular mechanism of differential ion binding of these two I domains.
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Affiliation(s)
- Kyle L Brown
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA. .,Center for Structural Biology, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA. .,Center for Matrix Biology, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.
| | - Surajit Banerjee
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA.,Northeastern Collaborative Access Team, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Andrew Feigley
- Leadership Alliance, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA
| | - Hanna Abe
- Aspirnaut Summer research program, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA
| | - Timothy S Blackwell
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Veterans Affairs Hospital, Nashville, TN, 37232, USA
| | - Ambra Pozzi
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Center for Matrix Biology, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Veterans Affairs Hospital, Nashville, TN, 37232, USA
| | - Billy G Hudson
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Center for Structural Biology, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Center for Matrix Biology, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Aspirnaut Summer research program, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Department of Biochemistry, Vanderbilt University, Nashville, TN, 37232-2372, USA
| | - Roy Zent
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Center for Matrix Biology, Vanderbilt University Medical Center, Nashville, TN, 37232-2372, USA.,Veterans Affairs Hospital, Nashville, TN, 37232, USA
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15
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Jia Z, Ackroyd C, Han T, Agrawal V, Liu Y, Christensen K, Dominy B. Effects from metal ion in tumor endothelial marker 8 and anthrax protective antigen: BioLayer Interferometry experiment and molecular dynamics simulation study. J Comput Chem 2017; 38:1183-1190. [PMID: 28437008 DOI: 10.1002/jcc.24768] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 01/08/2017] [Accepted: 01/14/2017] [Indexed: 11/09/2022]
Abstract
One of the anthrax receptors, tumor endothelial marker 8 (TEM8), is reported to be a potential anticancer target due to its over-expression during tumor angiogenesis. To extend our BioLayer Interferometry study in PA-TEM8 binding, we present a computational approach to reveal the role of an integral metal ion on receptor structure and binding thermodynamics. We estimated the interaction energy between PA and TEM8 using computer simulation. Consistent with experimental study, computational results indicate the metal ion in TEM8 contributes significantly to the binding affinity, and PA-TEM8 binding is more favorable in the presence of Mg2+ than Ca2+ . Further, computational analysis suggests that the differences in PA-TEM8 binding affinity are comparable to the closely related integrin proteins. The conformation change, which linked to changes in activity of integrins, was not found in TEM8. In the present of Mg2+ , TEM8 remains in a conformation analogous to an integrin open (high-affinity) conformation. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Zhe Jia
- Clemson University Department of Chemistry, 309 Hunter Lab Clemson University, Clemson, South Carolina, 29634
| | - Christine Ackroyd
- Department of Chemistry and Biochemistry, C205 BNSN, Brigham Young University, Provo, Utah, 84602
| | - Tingting Han
- Clemson University Department of Chemistry, 309 Hunter Lab Clemson University, Clemson, South Carolina, 29634
| | - Vibhor Agrawal
- Clemson University Department of Chemistry, 309 Hunter Lab Clemson University, Clemson, South Carolina, 29634
| | - Yinling Liu
- Clemson University Department of Chemistry, 309 Hunter Lab Clemson University, Clemson, South Carolina, 29634
| | - Kenneth Christensen
- Department of Chemistry and Biochemistry, C205 BNSN, Brigham Young University, Provo, Utah, 84602
| | - Brian Dominy
- Clemson University Department of Chemistry, 309 Hunter Lab Clemson University, Clemson, South Carolina, 29634
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16
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El Khoury Y, Hellwig P. Far infrared spectroscopy of hydrogen bonding collective motions in complex molecular systems. Chem Commun (Camb) 2017; 53:8389-8399. [DOI: 10.1039/c7cc03496b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Far infrared spectroscopy as a tool for the study of inter and intramolecular interactions in complex molecular structures.
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Affiliation(s)
- Youssef El Khoury
- Laboratoire de Bioélectrochimie et Spectroscopie
- UMR 7140
- CMC
- Université de Strasbourg CNRS
- Strasbourg
| | - Petra Hellwig
- Laboratoire de Bioélectrochimie et Spectroscopie
- UMR 7140
- CMC
- Université de Strasbourg CNRS
- Strasbourg
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17
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Alberro N, Torrent-Sucarrat M, Arrastia I, Arrieta A, Cossío FP. Two-State Reactivity of Histone Demethylases Containing Jumonji-C Active Sites: Different Mechanisms for Different Methylation Degrees. Chemistry 2016; 23:137-148. [DOI: 10.1002/chem.201604219] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Nerea Alberro
- Department of Organic Chemistry I; Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU); Centro de Innovación en Química Avanzada (ORFEO-CINQA); Manuel Lardizabal Ibilbidea 3 20018 San Sebastián/Donostia Spain
| | - Miquel Torrent-Sucarrat
- Department of Organic Chemistry I; Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU); Centro de Innovación en Química Avanzada (ORFEO-CINQA); Manuel Lardizabal Ibilbidea 3 20018 San Sebastián/Donostia Spain
- Donostia International Physics Center (DIPC); Manuel Lardizabal Ibilbidea 4 20018 San Sebastián/Donostia Spain
- Ikerbasque; Basque Foundation for Science; María Díaz de Haro 3, 6 floor 48013 Bilbao Spain
| | - Iosune Arrastia
- Donostia International Physics Center (DIPC); Manuel Lardizabal Ibilbidea 4 20018 San Sebastián/Donostia Spain
| | - Ana Arrieta
- Department of Organic Chemistry I; Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU); Centro de Innovación en Química Avanzada (ORFEO-CINQA); Manuel Lardizabal Ibilbidea 3 20018 San Sebastián/Donostia Spain
| | - Fernando P. Cossío
- Department of Organic Chemistry I; Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU); Centro de Innovación en Química Avanzada (ORFEO-CINQA); Manuel Lardizabal Ibilbidea 3 20018 San Sebastián/Donostia Spain
- Donostia International Physics Center (DIPC); Manuel Lardizabal Ibilbidea 4 20018 San Sebastián/Donostia Spain
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18
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Kläning E, Christensen B, Bajic G, Hoffmann SV, Jones NC, Callesen MM, Andersen GR, Sørensen ES, Vorup-Jensen T. Multiple low-affinity interactions support binding of human osteopontin to integrin αXβ2. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:930-8. [PMID: 25839998 DOI: 10.1016/j.bbapap.2015.03.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Revised: 03/18/2015] [Accepted: 03/22/2015] [Indexed: 01/11/2023]
Abstract
Integrin α(X)β(2) (also known as complement receptor 4, p150,95, or CD11c/CD18) is expressed in the cell membrane of myeloid leukocytes. α(X)β(2) has been reported to bind a large number of structurally unrelated ligands, often with a shared molecular character in the presence of polyanionic stretches in poorly folded proteins or glucosaminoglycans. Nevertheless, it is unclear what chemical sources of polyanionicity enable the binding by α(X)β(2). Osteopontin (OPN) is an intrinsically disordered protein, which facilitates phagocytosis via the integrin α(X)β(2). Unlike for other integrins, neither the RGD nor the SVVYGLR motifs account for this binding, and the molecular basis of OPN binding by α(X)β(2) remains uncharacterized. Here, we show that the monovalent interactions between the ligand-binding domain of α(X)β(2) and OPN, its fragments, or caseins are weak, with dissociation constants higher than 10(-5)M but with high apparent stoichiometries. From comparison with cell adhesion studies, the discrimination between α(X)β(2) ligands and non-ligands appears to rely on these apparent stoichiometries in a way, which involves glutamate rather than aspartate side chains. Surprisingly, the extensive, negatively charged phosphorylation of OPN is not contributing to α(X)β(2) binding. Furthermore, synchrotron radiation circular spectroscopy excludes that the phosphorylation affects the general folding of OPN. Taken together, our quantitative analyses reveal a mode of ligand recognition by integrin α(X)β(2), which seem to differ in principles considerably from other OPN receptors.
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Affiliation(s)
- Eva Kläning
- Dept. of Molecular Biology and Genetics Aarhus University, Aarhus, Denmark; Dept. of Biomedicine, Denmark
| | - Brian Christensen
- Dept. of Molecular Biology and Genetics Aarhus University, Aarhus, Denmark
| | - Goran Bajic
- Dept. of Molecular Biology and Genetics Aarhus University, Aarhus, Denmark
| | - Søren V Hoffmann
- Institute for Storage Ring Facilities Aarhus (ISA), Dept. of Physics and Astronomy & Center for Storage Ring Facilities Aarhus, Denmark
| | - Nykola C Jones
- Institute for Storage Ring Facilities Aarhus (ISA), Dept. of Physics and Astronomy & Center for Storage Ring Facilities Aarhus, Denmark
| | - Morten M Callesen
- Dept. of Molecular Biology and Genetics Aarhus University, Aarhus, Denmark
| | - Gregers R Andersen
- Dept. of Molecular Biology and Genetics Aarhus University, Aarhus, Denmark
| | - Esben S Sørensen
- Dept. of Molecular Biology and Genetics Aarhus University, Aarhus, Denmark; Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus Denmark
| | - Thomas Vorup-Jensen
- Dept. of Biomedicine, Denmark; Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus Denmark; MEMBRANES Research Center, Aarhus University, Aarhus, Denmark.
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19
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Zou Y, Zwolanek D, Izu Y, Gandhy S, Schreiber G, Brockmann K, Devoto M, Tian Z, Hu Y, Veit G, Meier M, Stetefeld J, Hicks D, Straub V, Voermans NC, Birk DE, Barton ER, Koch M, Bönnemann CG. Recessive and dominant mutations in COL12A1 cause a novel EDS/myopathy overlap syndrome in humans and mice. Hum Mol Genet 2013; 23:2339-52. [PMID: 24334604 DOI: 10.1093/hmg/ddt627] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Collagen VI-related myopathies are disorders of connective tissue presenting with an overlap phenotype combining clinical involvement from the muscle and from the connective tissue. Not all patients displaying related overlap phenotypes between muscle and connective tissue have mutations in collagen VI. Here, we report a homozygous recessive loss of function mutation and a de novo dominant mutation in collagen XII (COL12A1) as underlying a novel overlap syndrome involving muscle and connective tissue. Two siblings homozygous for a loss of function mutation showed widespread joint hyperlaxity combined with weakness precluding independent ambulation, while the patient with the de novo missense mutation was more mildly affected, showing improvement including the acquisition of walking. A mouse model with inactivation of the Col12a1 gene showed decreased grip strength, a delay in fiber-type transition and a deficiency in passive force generation while the muscle seems more resistant to eccentric contraction induced force drop, indicating a role for a matrix-based passive force-transducing elastic element in the generation of the weakness. This new muscle connective tissue overlap syndrome expands on the emerging importance of the muscle extracellular matrix in the pathogenesis of muscle disease.
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Affiliation(s)
- Yaqun Zou
- Neuromuscular and Neurogenetic Disorders of Childhood Section, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD, USA
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20
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Decleva E, Menegazzi R, Fasolo A, Defendi F, Sebastianutto M, Dri P. Intracellular shunting of O2(-) contributes to charge compensation and preservation of neutrophil respiratory burst in the absence of voltage-gated proton channel activity. Exp Cell Res 2013; 319:1875-1888. [PMID: 23578765 PMCID: PMC3712189 DOI: 10.1016/j.yexcr.2013.03.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 03/28/2013] [Accepted: 03/29/2013] [Indexed: 11/19/2022]
Abstract
Proton efflux via voltage-gated proton channels (Hv1) is considered to mediate the charge compensation necessary to preserve NADPH oxidase activity during the respiratory burst. Using the Hv1 inhibitor Zn2+, we found that the PMA-induced respiratory burst of human neutrophils is inhibited when assessed as extracellular production of O2− and H2O2, in accordance with literature studies, but, surprisingly, unaffected when measured as oxygen consumption or total (extracellular plus intracellular) H2O2 production. Furthermore, we show that inhibiting Hv1 with Zn2+ results in an increased production of intracellular ROS. Similar results, i.e. decreased extracellular and increased intracellular ROS production, were obtained using a human granulocyte-like cell line with severely impaired Hv1 expression. Acidic extracellular pH, which dampens proton efflux, also augmented intracellular production of H2O2. Zinc caused an increase in the rate but not in the extent of depolarization and cytosolic acidification indicating that mechanisms other than proton efflux take part in charge compensation. Our results suggest a hitherto unpredicted mechanism of charge compensation whereby, in the absence of proton efflux, part of O2− generated within gp91phox in the plasma membrane is shunted intracellularly down electrochemical gradient to dampen excessive depolarization. This would preserve NADPH oxidase activity under conditions such as the inflammatory exudate in which the acidic pH hinders charge compensation by proton efflux. Neutrophils’ respiratory burst is not inhibited by the H+ channel inhibitor Zn2+. Intracellular production of O2− and H2O2 is increased in the presence of Zn2+. Intracellular H2O2 production is increased in H+ channels knock-down cells. Zn2+ increases the rate but not the extent of depolarization and pHi decrease. Intracellular shunting of O2− contributes to charge compensation in neutrophils.
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Affiliation(s)
- Eva Decleva
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Renzo Menegazzi
- Department of Life Sciences, University of Trieste, Trieste, Italy.
| | - Alba Fasolo
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Federica Defendi
- Université Joseph Fourier, GREPI/AGIM CNRS FRE 3405, Grenoble, France
| | | | - Pietro Dri
- Department of Life Sciences, University of Trieste, Trieste, Italy
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21
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Adair BD, Xiong JP, Alonso JL, Hyman BT, Arnaout MA. EM structure of the ectodomain of integrin CD11b/CD18 and localization of its ligand-binding site relative to the plasma membrane. PLoS One 2013; 8:e57951. [PMID: 23469114 PMCID: PMC3585415 DOI: 10.1371/journal.pone.0057951] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Accepted: 01/27/2013] [Indexed: 11/19/2022] Open
Abstract
One-half of the integrin α-subunit Propeller domains contain and extra vWFA domain (αA domain), which mediates integrin binding to extracellular physiologic ligands via its metal-ion-dependent adhesion site (MIDAS). We used electron microscopy to determine the 3D structure of the αA-containing ectodomain of the leukocyte integrin CD11b/CD18 (αMβ2) in its inactive state. A well defined density for αA was observed within a bent ectodomain conformation, while the structure of the ectodomain in complex with the Fab fragment of mAb107, which binds at the MIDAS face of CD11b and stabilizes the inactive state, further revealed that αA is restricted to a relatively small range of orientations relative to the Propeller domain. Using Fab 107 as probe in fluorescent lifetime imaging microscopy (FLIM) revealed that αA is positioned relatively far from the membrane surface in the inactive state, and a systematic orientation search revealed that the MIDAS face would be accessible to extracellular ligand in the inactive state of the full-length cellular integrin. These studies are the first to define the 3D EM structure of an αA-containing integrin ectodomain and to position the ligand-binding face of αA domain in relation to the plasma membrane, providing new insights into current models of integrin activation.
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Affiliation(s)
- Brian D. Adair
- Structural Biology Program, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, United States of America
| | - Jian-Ping Xiong
- Structural Biology Program, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, United States of America
| | - José Luis Alonso
- Leukocyte Biology and Inflammation Program, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, United States of America
| | - Bradley T. Hyman
- Division of Nephrology, and Institute for Neurodegenerative Disease, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, United States of America
| | - M. Amin Arnaout
- Structural Biology Program, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, United States of America
- Leukocyte Biology and Inflammation Program, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, United States of America
- * E-mail:
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22
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San Sebastián E, Zimmerman T, Zubia A, Vara Y, Martin E, Sirockin F, Dejaegere A, Stote RH, Lopez X, Pantoja-Uceda D, Valcárcel M, Mendoza L, Vidal-Vanaclocha F, Cossío FP, Blanco FJ. Design, synthesis, and functional evaluation of leukocyte function associated antigen-1 antagonists in early and late stages of cancer development. J Med Chem 2013; 56:735-47. [PMID: 23339734 DOI: 10.1021/jm3016848] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The integrin leukocyte function associated antigen 1 (LFA-1) binds the intercellular adhesion molecule 1 (ICAM-1) by its α(L)-chain inserted domain (I-domain). This interaction plays a key role in cancer and other diseases. We report the structure-based design, small-scale synthesis, and biological activity evaluation of a novel family of LFA-1 antagonists. The design led to the synthesis of a family of highly substituted homochiral pyrrolidines with antiproliferative and antimetastatic activity in a murine model of colon carcinoma, as well as potent antiadhesive properties in several cancer cell lines in the low micromolar range. NMR analysis of their binding to the isolated I-domain shows that they bind to the I-domain allosteric site (IDAS), the binding site of other allosteric LFA-1 inhibitors. These results provide evidence of the potential therapeutic value of a new set of LFA-1 inhibitors, whose further development is facilitated by a synthetic strategy that is versatile and fully stereocontrolled.
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23
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Vorup-Jensen T. On the roles of polyvalent binding in immune recognition: perspectives in the nanoscience of immunology and the immune response to nanomedicines. Adv Drug Deliv Rev 2012; 64:1759-81. [PMID: 22705545 DOI: 10.1016/j.addr.2012.06.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2012] [Revised: 06/06/2012] [Accepted: 06/08/2012] [Indexed: 12/31/2022]
Abstract
Immunology often conveys the image of large molecules, either in the soluble state or in the membrane of leukocytes, forming multiple contacts with a target for actions of the immune system. Avidity names the ability of a polyvalent molecule to form multiple connections of the same kind with ligands tethered to the same surface. Polyvalent interactions are vastly stronger than their monovalent equivalent. In the present review, the functional consequences of polyvalent interactions are explored in a perspective of recent theoretical advances in understanding the thermodynamics of such binding. From insights on the structural biology of soluble pattern recognition molecules as well as adhesion molecules in the cell membranes or in their proteolytically shed form, this review documents the prominent role of polyvalent interactions in making the immune system a formidable barrier to microbial infection as well as constituting a significant challenge to the application of nanomedicines.
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24
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Weinreb PH, Li S, Gao SX, Liu T, Pepinsky RB, Caravella JA, Lee JH, Woods VL. Dynamic structural changes are observed upon collagen and metal ion binding to the integrin α1 I domain. J Biol Chem 2012; 287:32897-912. [PMID: 22847004 PMCID: PMC3463359 DOI: 10.1074/jbc.m112.354365] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2012] [Revised: 07/11/2012] [Indexed: 02/05/2023] Open
Abstract
We have applied hydrogen-deuterium exchange mass spectrometry, in conjunction with differential scanning calorimetry and protein stability analysis, to examine solution dynamics of the integrin α1 I domain induced by the binding of divalent cations, full-length type IV collagen, or a function-blocking monoclonal antibody. These studies revealed features of integrin activation and α1I-ligand complexes that were not detected by static crystallographic data. Mg(2+) and Mn(2+) stabilized α1I but differed in their effects on exchange rates in the αC helix. Ca(2+) impacted α1I conformational dynamics without altering its gross thermal stability. Interaction with collagen affected the exchange rates in just one of three metal ion-dependent adhesion site (MIDAS) loops, suggesting that MIDAS loop 2 plays a primary role in mediating ligand binding. Collagen also induced changes consistent with increased unfolding in both the αC and allosteric C-terminal helices of α1I. The antibody AQC2, which binds to α1I in a ligand-mimetic manner, also reduced exchange in MIDAS loop 2 and increased exchange in αC, but it did not impact the C-terminal region. This is the first study to directly demonstrate the conformational changes induced upon binding of an integrin I domain to a full-length collagen ligand, and it demonstrates the utility of the deuterium exchange mass spectrometry method to study the solution dynamics of integrin/ligand and integrin/metal ion interactions. Based on the ligand and metal ion binding data, we propose a model for collagen-binding integrin activation that explains the differing abilities of Mg(2+), Mn(2+), and Ca(2+) to activate I domain-containing integrins.
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Affiliation(s)
| | - Sheng Li
- the Department of Medicine and Biomedical Sciences Graduate Program, University of California San Diego, La Jolla, California 92093-0656
| | - Sharon X. Gao
- From Biogen Idec, Inc., Cambridge, Massachusetts 02142 and
| | - Tong Liu
- the Department of Medicine and Biomedical Sciences Graduate Program, University of California San Diego, La Jolla, California 92093-0656
| | | | | | - Jun H. Lee
- the Department of Medicine and Biomedical Sciences Graduate Program, University of California San Diego, La Jolla, California 92093-0656
| | - Virgil L. Woods
- the Department of Medicine and Biomedical Sciences Graduate Program, University of California San Diego, La Jolla, California 92093-0656
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25
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Mahalingam B, Ajroud K, Alonso JL, Anand S, Adair B, Horenstein AL, Malavasi F, Xiong JP, Arnaout MA. Stable coordination of the inhibitory Ca2+ ion at the metal ion-dependent adhesion site in integrin CD11b/CD18 by an antibody-derived ligand aspartate: implications for integrin regulation and structure-based drug design. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2011; 187:6393-401. [PMID: 22095715 PMCID: PMC3237904 DOI: 10.4049/jimmunol.1102394] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A central feature of integrin interaction with physiologic ligands is the monodentate binding of a ligand carboxylate to a Mg(2+) ion hexacoordinated at the metal ion-dependent adhesion site (MIDAS) in the integrin A domain. This interaction stabilizes the A domain in the high-affinity state, which is distinguished from the default low-affinity state by tertiary changes in the domain that culminate in cell adhesion. Small molecule ligand-mimetic integrin antagonists act as partial agonists, eliciting similar activating conformational changes in the A domain, which has contributed to paradoxical adhesion and increased patient mortality in large clinical trials. As with other ligand-mimetic integrin antagonists, the function-blocking mAb 107 binds MIDAS of integrin CD11b/CD18 A domain (CD11bA), but in contrast, it favors the inhibitory Ca(2+) ion over the Mg(2+) ion at MIDAS. We determined the crystal structures of the Fab fragment of mAb 107 complexed to the low- and high-affinity states of CD11bA. Favored binding of the Ca(2+) ion at MIDAS is caused by the unusual symmetric bidentate ligation of a Fab-derived ligand Asp to a heptacoordinated MIDAS Ca(2+) ion. Binding of the Fab fragment of mAb 107 to CD11bA did not trigger the activating tertiary changes in the domain or in the full-length integrin. These data show that the denticity of the ligand Asp/Glu can modify the divalent cation selectivity at MIDAS and hence integrin function. Stabilizing the Ca(2+) ion at MIDAS by bidentate ligation to a ligand Asp/Glu may provide one approach for designing pure integrin antagonists.
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Affiliation(s)
- Bhuvaneshwari Mahalingam
- Structural Biology Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129,Leukocyte Biology and Inflammation Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129
| | - Kaouther Ajroud
- Leukocyte Biology and Inflammation Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129
| | - Jose Luis Alonso
- Leukocyte Biology and Inflammation Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129
| | - Saurabh Anand
- Leukocyte Biology and Inflammation Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129
| | - Brian Adair
- Structural Biology Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129,Leukocyte Biology and Inflammation Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129
| | - Alberto L Horenstein
- Lab of Immunogenetics, University of Torino Medical School, 10126, Torino, Italy
| | - Fabio Malavasi
- Lab of Immunogenetics, University of Torino Medical School, 10126, Torino, Italy
| | - Jian-Ping Xiong
- Structural Biology Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129,Leukocyte Biology and Inflammation Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129
| | - M. Amin Arnaout
- Structural Biology Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129,Leukocyte Biology and Inflammation Program, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129,Address correspondence to: M. Amin Arnaout, Division of Nephrology, Massachusetts General Hospital, 149 13th Street, Charlestown, MA, 02129, Tel: 617-726-5663, Fax: 617-726-5671.
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26
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Hantgan RR, Stahle MC. Integrin Priming Dynamics: Mechanisms of Integrin Antagonist-Promoted αIIbβ3:PAC-1 Molecular Recognition. Biochemistry 2009; 48:8355-65. [DOI: 10.1021/bi900475k] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roy R. Hantgan
- Department of Biochemistry, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina 27157-1016
| | - Mary C. Stahle
- Department of Biochemistry, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina 27157-1016
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27
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Lomakina E, Knauf PA, Schultz JB, Law FY, McGraw MD, Waugh RE. Activation of human neutrophil Mac-1 by anion substitution. Blood Cells Mol Dis 2009; 42:177-84. [PMID: 19246218 DOI: 10.1016/j.bcmd.2009.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 01/06/2009] [Indexed: 12/18/2022]
Abstract
Substituting the medium chloride with glucuronate or glutamate causes a rapid, 10 to 30-fold, increase in the binding of the monoclonal antibody, CBRM1/5, which recognizes the high-affinity conformation of the Mac-1 integrin. This change is reflected in functional adhesion assays that show increased adhesion to ICAM-1 coated beads. Blocking antibodies indicate that the increased adhesion is almost entirely due to Mac-1. The inhibitor NPPB (100 microM) reduces Cl(-) efflux into low Cl(-) medium by 75%, and blocks increased CBRM1/5 binding after stimulation with fMLP or TNF-alpha, but has no effect on the anion substitution induced increase in CBRM1/5 binding or adhesion to immobilized ICAM-1. Thus, changes in external anion composition, not internal chloride or increases in Cl(-) efflux, are responsible for Mac-1 activation. This effect is substantial. The percentage of Mac-1 in the high affinity state approaches 100% in glutamate and 50% in glucuronate, a far greater response than what is observed after stimulation with fMLP.
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Affiliation(s)
- Elena Lomakina
- Department of Pharmacology and Physiology, School of Medicine, University of Rochester, Rochester, NY 14642, USA
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28
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Hantgan RR, Stahle MC, Horita DA. Entropy Drives Integrin αIIbβ3:Echistatin Binding—Evidence from Surface Plasmon Resonance Spectroscopy. Biochemistry 2008; 47:2884-92. [DOI: 10.1021/bi701877a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Roy R. Hantgan
- Department of Biochemistry, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina 27157-1016
| | - Mary C. Stahle
- Department of Biochemistry, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina 27157-1016
| | - David A. Horita
- Department of Biochemistry, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina 27157-1016
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29
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Rezabal E, Mercero JM, Lopez X, Ugalde JM. Protein side chains facilitate Mg/Al exchange in model protein binding sites. Chemphyschem 2008; 8:2119-24. [PMID: 17712827 DOI: 10.1002/cphc.200700335] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Among the most frequent protein binding sites served by Mg(II), we identify those which have higher affinity towards Al(III). We also estimate the free energies of metal exchange for all these binding sites taking into account solvent effects explicitly. The obtained results show that thermodynamically favored Mg(II)/Al(III) exchange reactions take place at a number of these metal binding sites, which could possibly be related to some dysfunctions of Mg(II)-dependent biological processes. Additionally, they shed light on the molecular basis of the toxicity of Al(III) in living organisms.
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Affiliation(s)
- Elixabete Rezabal
- Kimika Fakultatea, Euskal Herriko Unibertsitatea and Donostia International Physics Center, P. K. 1072, 20080 Donostia, Euskadi, Spain
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30
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Rezabal E, Mercero JM, Lopez X, Ugalde JM. A theoretical study of the principles regulating the specificity for Al(III) against Mg(II) in protein cavities. J Inorg Biochem 2007; 101:1192-200. [PMID: 17659345 DOI: 10.1016/j.jinorgbio.2007.06.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2007] [Revised: 05/25/2007] [Accepted: 06/05/2007] [Indexed: 10/23/2022]
Abstract
Several toxic effects arise from Al's presence in living systems, one of them being the alteration of the natural role of enzymes and non-enzyme proteins. Al(III) is capable of entering protein active sites that in normal conditions should be occupied by other metals. Even if Mg(II) is an ubiquitous metal in biological systems, the interference of aluminium in magnesium metabolism is not clear yet. In this work, a systematic study of the affinity of Al(III) for different protein binding sites is presented, with special attention on structural parameters, the role of the charge and the presence of different ligands in the protein cavity. The specificity of the binding site for Al(III) against Mg(II) has been studied, and also the thermodynamical propensity of a Mg(II)/Al(III) exchange. Quantum mechanical methods that proved to be reliable in previous works have been used, namely, the density functional theory (DFT) and polarizable continuum model (PCM).
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Affiliation(s)
- Elixabete Rezabal
- Kimika Fakultatea, Euskal Herriko Unibertsitatea and Donostia International Physics Center, PK 1072, 20080 Donostia, Euskadi, Spain.
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31
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Vorup-Jensen T, Waldron TT, Astrof N, Shimaoka M, Springer TA. The connection between metal ion affinity and ligand affinity in integrin I domains. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2007; 1774:1148-55. [PMID: 17702677 PMCID: PMC2040231 DOI: 10.1016/j.bbapap.2007.06.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2007] [Revised: 06/20/2007] [Accepted: 06/21/2007] [Indexed: 11/24/2022]
Abstract
Integrins are cell-surface heterodimeric proteins that mediate cell-cell, cell-matrix, and cell-pathogen interactions. Half of the known integrin alpha subunits contain inserted domains (I domains) that coordinate ligand through a metal ion. Although the importance of conformational changes within isolated I domains in regulating ligand binding has been reported, the relationship between metal ion binding affinity and ligand binding affinity has not been elucidated. Metal and ligand binding by several I domain mutants that are stabilized in different conformations are investigated using isothermal titration calorimetry and surface plasmon resonance studies. This work suggests an inverse relationship between metal ion affinity and ligand binding affinity (i.e. constructs with a high affinity for ligand exhibit a low affinity for metal). This trend is discussed in the context of structural studies to provide an understanding of interplay between metal ion binding and ligand affinities and conformational changes.
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Affiliation(s)
- Thomas Vorup-Jensen
- CBR Institute for Biomedical Research and Department of Pathology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA
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32
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Gaillard T, Martin E, San Sebastian E, Cossío FP, Lopez X, Dejaegere A, Stote RH. Comparative normal mode analysis of LFA-1 integrin I-domains. J Mol Biol 2007; 374:231-49. [PMID: 17919656 DOI: 10.1016/j.jmb.2007.07.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2007] [Revised: 07/02/2007] [Accepted: 07/02/2007] [Indexed: 11/29/2022]
Abstract
The conformational dynamics of the Inserted domain (I-domain) from the lymphocyte function-associated antigen-1 (LFA-1) was investigated by normal mode analysis of multiple structures of the low, intermediate, and high affinity states. LFA-1 is an integrin expressed on leukocytes and is of critical importance in adhesion reactions, like antigen-specific responses, homing, and diapedesis. The main ligand binding site of LFA-1 is the I-domain, which recognizes intercellular adhesion molecules (ICAMs), members of the immunoglobulin superfamily. From experimental crystal structures, a large-scale conformational change of, among others, the alpha7 helix of the I-domain has been observed leading to the proposal that these structural changes are linked to the conformational regulation of LFA-1. The results from the present calculations show that structural changes of the alpha7 helix consistent with those observed in the crystal structures are significantly sampled by the low frequency modes. This was found to be particularly true for the low affinity state of the I-domain, indicating that low frequency motions favor the conformational transition implicated in activation. However, beyond the simple downward shift of the helix implied by the crystal structures, the calculations further show that there is a noticeable swinging-out motion of the helix. The consequences of this motion are discussed in the context of integrin activation and inhibition. Moreover, significant changes in the atomic-level dynamics and in long-range correlated motions of the I-domain were found to occur upon binding of the natural ligand ICAM. These changes were more local upon binding of an allosteric inhibitor. The present study opens the question of how changes in dynamics may contribute to the long-range transmission of signal upon ICAM binding by the LFA-1 I-domain.
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Affiliation(s)
- Thomas Gaillard
- Laboratoire de Biophysicochimie Moléculaire, Institut de Chimie de Strasbourg, Université Louis Pasteur, BP 1032, Strasbourg, France
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33
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Sebastian ES, Matxain JM, Eriksson LA, Stote RH, Dejaegere A, Cossio FP, Lopez X. Metal Ion Dependent Adhesion Sites in Integrins: A Combined DFT and QMC Study on Mn2+. J Phys Chem B 2007; 111:9099-103. [PMID: 17608410 DOI: 10.1021/jp071065s] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The theoretical study of relative energies of different spin states of Mn2+ has been carried out for the isolated cation and for structures in which the cation is coordinated to ligands that represent the first coordination shell in a protein environment that contains a metal ion dependent adhesion site (MIDAS, found in the ligand binding domain of protein LFA-1). The calculations determine whether the ligand field generated by a prototype protein environment affects the relative energies between high, intermediate, and low spin states. Geometry optimizations and vibrational frequency calculations were carried out at the B3LYP/SKBJ+* level of theory. Single point calculations were performed at the B3LYP/6-311++G(2df,2p) and diffusion monte carlo (DMC) levels for the refinement of the electronic energies. These calculations reveal important differences in the relative energies between high/low spin complexes obtained by B3LYP and DMC and show that although both DFT and DMC show similar trends, a higher level method such as DMC is necessary for a quantitative description of the interactions between Mn2+ and its natural ligands. (G)s of acetate-type ligand binding reactions were calculated that show that the higher the spin of the manganese complex, the lower the affinity for the ligand.
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Affiliation(s)
- Eider San Sebastian
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, P.K. 1072, 20080 Donostia, Spain
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34
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Rezabal E, Marino T, Mercero JM, Russo N, Ugalde JM. Complexation of AlIII by Aromatic Amino Acids in the Gas Phase. Inorg Chem 2007; 46:6413-9. [PMID: 17608416 DOI: 10.1021/ic7004776] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The coordination properties of three natural aromatic amino acids (AAAs)-phenylalanine (Phe), tyrosine (Tyr), and tryptophan (Trp)-to AlIII are studied in this work, devoting special attention to the role of the aromatic side chain. A comparison with aluminum(III)-alanine complexes is also presented. The polarizability arising from the ring has been seen to be a key factor in the stability of the complexes, with the order being Trp-AlIII > Tyr-AlIII > Phe-AlIII, starting from the most stable one. Cation-pi interactions between the metal and the aromatic ring are present in the lowest energy conformers, especially for Trp, which seems to be very well suited for these kinds of interactions, occurring with both the six- and five-membered rings of the indole side chain. The most stable coordination mode for the three AAAs is found to be tricoordinated with the N and O of the backbone chain and the aromatic ring, as was found theoretically and experimentally for other metals.
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Affiliation(s)
- E Rezabal
- Kimika Fakultatea, Euskal Herriko Unibertsitatea and Donostia International Physics Center, PK 1072, 20080 Donostia, Euskadi, Spain.
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