1
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Axelsen TV, Olesen C, Khan D, Mohammadi A, Bouzinova EV, Nielsen CJF, Mele M, Hauerslev KR, Pedersen HL, Balling E, Vahl P, Tramm T, Christiansen PM, Boedtkjer E. Antibodies toward Na +,HCO 3--cotransporter NBCn1/SLC4A7 block net acid extrusion and cause pH-dependent growth inhibition and apoptosis in breast cancer. Br J Cancer 2024; 130:1206-1220. [PMID: 38310186 PMCID: PMC10991555 DOI: 10.1038/s41416-024-02591-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 01/09/2024] [Accepted: 01/17/2024] [Indexed: 02/05/2024] Open
Abstract
BACKGROUND Na+,HCO3--cotransporter NBCn1/Slc4a7 accelerates murine breast carcinogenesis. Lack of specific pharmacological tools previously restricted therapeutic targeting of NBCn1 and identification of NBCn1-dependent functions in human breast cancer. METHODS We develop extracellularly-targeted anti-NBCn1 antibodies, screen for functional activity on cells, and evaluate (a) mechanisms of intracellular pH regulation in human primary breast carcinomas, (b) proliferation, cell death, and tumor growth consequences of NBCn1 in triple-negative breast cancer, and (c) association of NBCn1-mediated Na+,HCO3--cotransport with human breast cancer metastasis. RESULTS We identify high-affinity (KD ≈ 0.14 nM) anti-NBCn1 antibodies that block human NBCn1-mediated Na+,HCO3--cotransport in cells, without cross-reactivity towards human NBCe1 or murine NBCn1. These anti-NBCn1 antibodies abolish Na+,HCO3--cotransport activity in freshly isolated primary organoids from human breast carcinomas and lower net acid extrusion effectively in primary breast cancer tissue from patients with macrometastases in axillary lymph nodes. Inhibitory anti-NBCn1 antibodies decelerate tumor growth in vivo by ~50% in a patient-derived xenograft model of triple-negative breast cancer and pH-dependently reduce colony formation, cause G2/M-phase cell cycle accumulation, and increase apoptosis of metastatic triple-negative breast cancer cells in vitro. CONCLUSIONS Inhibitory anti-NBCn1 antibodies block net acid extrusion in human breast cancer tissue, particularly from patients with disseminated disease, and pH-dependently limit triple-negative breast cancer growth.
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Affiliation(s)
- Trine V Axelsen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Claus Olesen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Danish Khan
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Ali Mohammadi
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | | | | | - Marco Mele
- Department of Surgery, Randers Regional Hospital, Randers, Denmark
| | - Katrine R Hauerslev
- Department of Plastic and Breast Surgery, Aarhus University Hospital, Aarhus, Denmark
| | - Helene L Pedersen
- Department of Pathology, Randers Regional Hospital, Randers, Denmark
| | - Eva Balling
- Department of Surgery, Randers Regional Hospital, Randers, Denmark
| | - Pernille Vahl
- Department of Pathology, Aarhus University Hospital, Aarhus, Denmark
| | - Trine Tramm
- Department of Pathology, Aarhus University Hospital, Aarhus, Denmark
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Peer M Christiansen
- Department of Surgery, Randers Regional Hospital, Randers, Denmark
- Department of Plastic and Breast Surgery, Aarhus University Hospital, Aarhus, Denmark
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Ebbe Boedtkjer
- Department of Biomedicine, Aarhus University, Aarhus, Denmark.
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2
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Skov M, Ruijs TQ, Grønnebæk TS, Skals M, Riisager A, Winther JB, Dybdahl KLT, Findsen A, Morgen JJ, Huus N, Broch-Lips M, Nielsen OB, de Cuba CMKE, Heuberger JAAC, de Kam ML, Tannemaat M, Verschuuren JJGM, Knutsen LJS, Kelly NM, Jensen KG, Arnold WD, Burghes AH, Olesen C, Bold J, Petersen TK, Quiroz JA, Hutchison J, Chin ER, Groeneveld GJ, Pedersen TH. The ClC-1 chloride channel inhibitor NMD670 improves skeletal muscle function in rat models and patients with myasthenia gravis. Sci Transl Med 2024; 16:eadk9109. [PMID: 38507469 DOI: 10.1126/scitranslmed.adk9109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 02/23/2024] [Indexed: 03/22/2024]
Abstract
Myasthenia gravis (MG) is a neuromuscular disease that results in compromised transmission of electrical signals at the neuromuscular junction (NMJ) from motor neurons to skeletal muscle fibers. As a result, patients with MG have reduced skeletal muscle function and present with symptoms of severe muscle weakness and fatigue. ClC-1 is a skeletal muscle specific chloride (Cl-) ion channel that plays important roles in regulating neuromuscular transmission and muscle fiber excitability during intense exercise. Here, we show that partial inhibition of ClC-1 with an orally bioavailable small molecule (NMD670) can restore muscle function in rat models of MG and in patients with MG. In severely affected MG rats, ClC-1 inhibition enhanced neuromuscular transmission, restored muscle function, and improved mobility after both single and prolonged administrations of NMD670. On this basis, NMD670 was progressed through nonclinical safety pharmacology and toxicology studies, leading to approval for testing in clinical studies. After successfully completing phase 1 single ascending dose in healthy volunteers, NMD670 was tested in patients with MG in a randomized, placebo-controlled, single-dose, three-way crossover clinical trial. The clinical trial evaluated safety, pharmacokinetics, and pharmacodynamics of NMD670 in 12 patients with mild MG. NMD670 had a favorable safety profile and led to clinically relevant improvements in the quantitative myasthenia gravis (QMG) total score. This translational study spanning from single muscle fiber recordings to patients provides proof of mechanism for ClC-1 inhibition as a potential therapeutic approach in MG and supports further development of NMD670.
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Affiliation(s)
- Martin Skov
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Titia Q Ruijs
- Centre for Human Drug Research, 2333 CL Leiden, Netherlands
- Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | | | - Marianne Skals
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Anders Riisager
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | | | | | - Anders Findsen
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Jeanette J Morgen
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Nete Huus
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Martin Broch-Lips
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Ole B Nielsen
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
- Department of Biomedicine, Aarhus University, Ole Worms Alle 4, 8000 Aarhus C, Denmark
| | - Catherine M K E de Cuba
- Centre for Human Drug Research, 2333 CL Leiden, Netherlands
- Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | | | | | | | | | - Lars J S Knutsen
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Nicholas M Kelly
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Klaus G Jensen
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - William D Arnold
- NextGen Precision Health, University of Missouri, 1030 Hitt St, Columbia, MO 65212, USA
| | - Arthur H Burghes
- Department of Biological Chemistry and Pharmacology, Ohio State University Wexner Medical Center, 1060 Carmack Road, Columbus, OH 43210, USA
- Department of Neurology, Neuromuscular Division, Ohio State University Wexner Medical Center, 395 W. 12(th) Ave, Columbus, OH 43210, USA
| | - Claus Olesen
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
- Department of Biomedicine, Aarhus University, Ole Worms Alle 4, 8000 Aarhus C, Denmark
| | - Jane Bold
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Thomas K Petersen
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Jorge A Quiroz
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - John Hutchison
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Eva R Chin
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
| | - Geert J Groeneveld
- Centre for Human Drug Research, 2333 CL Leiden, Netherlands
- Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Thomas H Pedersen
- NMD Pharma A/S, Palle Juul-Jensens Boulevard 82, 8200 Aarhus N, Denmark
- Department of Biomedicine, Aarhus University, Ole Worms Alle 4, 8000 Aarhus C, Denmark
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3
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Olesen C, Muren L, Elstrøm U, Taasti V. MO-0793 Tissue-specific range uncertainty estimation in proton therapy. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02429-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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4
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El Omari K, Mohamad N, Bountra K, Duman R, Romano M, Schlegel K, Kwong HS, Mykhaylyk V, Olesen C, Moller JV, Bublitz M, Beis K, Wagner A. Experimental phasing with vanadium and application to nucleotide-binding membrane proteins. IUCrJ 2020; 7:1092-1101. [PMID: 33209320 PMCID: PMC7642786 DOI: 10.1107/s2052252520012312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 09/07/2020] [Indexed: 06/11/2023]
Abstract
The structure determination of soluble and membrane proteins can be hindered by the crystallographic phase problem, especially in the absence of a suitable homologous structure. Experimental phasing is the method of choice for novel structures; however, it often requires heavy-atom derivatization, which can be difficult and time-consuming. Here, a novel and rapid method to obtain experimental phases for protein structure determination by vanadium phasing is reported. Vanadate is a transition-state mimic of phosphoryl-transfer reactions and it has the advantage of binding specifically to the active site of numerous enzymes catalyzing this reaction. The applicability of vanadium phasing has been validated by determining the structures of three different protein-vanadium complexes, two of which are integral membrane proteins: the rabbit sarcoplasmic reticulum Ca2+-ATPase, the antibacterial peptide ATP-binding cassette transporter McjD from Escherichia coli and the soluble enzyme RNAse A from Bos taurus. Vanadium phasing was successful even at low resolution and despite severe anisotropy in the data. This method is principally applicable to a large number of proteins, representing six of the seven Enzyme Commission classes. It relies exclusively on the specific chemistry of the protein and it does not require any modifications, making it a very powerful addition to the phasing toolkit. In addition to the phasing power of this technique, the protein-vanadium complexes also provide detailed insights into the reaction mechanisms of the studied proteins.
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Affiliation(s)
- Kamel El Omari
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom
| | - Nada Mohamad
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Kiran Bountra
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom
- Department of Life Sciences, Imperial College, London, United Kingdom
| | - Ramona Duman
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom
| | - Maria Romano
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom
- Department of Life Sciences, Imperial College, London, United Kingdom
- Institute of Biostructures and Bioimaging, National Research Council (IBB–CNR), Via Mezzocannone 16, 80134 Napoli, Italy
| | - Katja Schlegel
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Hok-Sau Kwong
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom
- Department of Life Sciences, Imperial College, London, United Kingdom
| | - Vitaliy Mykhaylyk
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom
| | - Claus Olesen
- Department of Biomedicine, Aarhus University, Ole Worms Allé 8, DK-8000 Aarhus, Denmark
| | - Jesper Vuust Moller
- Department of Biomedicine, Aarhus University, Ole Worms Allé 8, DK-8000 Aarhus, Denmark
| | - Maike Bublitz
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Konstantinos Beis
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom
- Department of Life Sciences, Imperial College, London, United Kingdom
| | - Armin Wagner
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom
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5
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Ravishankar H, Pedersen MN, Eklund M, Sitsel A, Li C, Duelli A, Levantino M, Wulff M, Barth A, Olesen C, Nissen P, Andersson M. Tracking Ca 2+ ATPase intermediates in real time by x-ray solution scattering. Sci Adv 2020; 6:eaaz0981. [PMID: 32219166 PMCID: PMC7083613 DOI: 10.1126/sciadv.aaz0981] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 12/23/2019] [Indexed: 05/14/2023]
Abstract
Sarco/endoplasmic reticulum Ca2+ ATPase (SERCA) transporters regulate calcium signaling by active calcium ion reuptake to internal stores. Structural transitions associated with transport have been characterized by x-ray crystallography, but critical intermediates involved in the accessibility switch across the membrane are missing. We combined time-resolved x-ray solution scattering (TR-XSS) experiments and molecular dynamics (MD) simulations for real-time tracking of concerted SERCA reaction cycle dynamics in the native membrane. The equilibrium [Ca2]E1 state before laser activation differed in the domain arrangement compared with crystal structures, and following laser-induced release of caged ATP, a 1.5-ms intermediate was formed that showed closure of the cytoplasmic domains typical of E1 states with bound Ca2+ and ATP. A subsequent 13-ms transient state showed a previously unresolved actuator (A) domain arrangement that exposed the ADP-binding site after phosphorylation. Hence, the obtained TR-XSS models determine the relative timing of so-far elusive domain rearrangements in a native environment.
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Affiliation(s)
- Harsha Ravishankar
- Department of Chemistry, Umeå University. Linnaeus Väg 10, 901 87 Umeå, Sweden
| | | | | | - Aljona Sitsel
- DANDRITE–Nordic EMBL Partnership for Molecular Medicine, Department of Molecular Biology and Genetics, Aarhus University. Gustav Wieds Vej 10, 8000 Aarhus C, Denmark
| | - Chenge Li
- Department of Biochemistry and Biophysics, Stockholm University. Svante Arrhenius Väg 16C, 106 91 Stockholm, Sweden
| | - Annette Duelli
- Department of Biomedical Sciences, University of Copenhagen. Blegdamsvej 3, 2200 Copenhagen, Denmark
| | - Matteo Levantino
- European Synchrotron Radiation Facility, Grenoble, Cedex 38043, BP 220, France
- Department of Physics and Chemistry, University of Palermo, Viale delle Scienze -Ed 18, 90128 Palermo, Italy
| | - Michael Wulff
- European Synchrotron Radiation Facility, Grenoble, Cedex 38043, BP 220, France
| | - Andreas Barth
- Department of Biochemistry and Biophysics, Stockholm University. Svante Arrhenius Väg 16C, 106 91 Stockholm, Sweden
| | - Claus Olesen
- Department of Biomedicine, Aarhus University, Vest Ole Worms Allé 3, 113 8000 Aarhus C, Denmark
| | - Poul Nissen
- DANDRITE–Nordic EMBL Partnership for Molecular Medicine, Department of Molecular Biology and Genetics, Aarhus University. Gustav Wieds Vej 10, 8000 Aarhus C, Denmark
| | - Magnus Andersson
- Department of Chemistry, Umeå University. Linnaeus Väg 10, 901 87 Umeå, Sweden
- Corresponding author.
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6
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Ravishankar H, Nors Pedersen M, Sitsel A, Li C, Duelli A, Levantino M, Wulff M, Barth A, Olesen C, Nissen P, Andersson M. Tracking Ca2+ATPase Intermediates in Real-time by X-Ray Solution Scattering. Biophys J 2020. [DOI: 10.1016/j.bpj.2019.11.324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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7
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Sitsel A, De Raeymaecker J, Drachmann ND, Derua R, Smaardijk S, Andersen JL, Vandecaetsbeek I, Chen J, De Maeyer M, Waelkens E, Olesen C, Vangheluwe P, Nissen P. Structures of the heart specific SERCA2a Ca 2+-ATPase. EMBO J 2019; 38:embj.2018100020. [PMID: 30777856 DOI: 10.15252/embj.2018100020] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 12/29/2018] [Accepted: 01/10/2019] [Indexed: 12/11/2022] Open
Abstract
The sarcoplasmic/endoplasmic reticulum Ca2+-ATPase 2a (SERCA2a) performs active reuptake of cytoplasmic Ca2+ and is a major regulator of cardiac muscle contractility. Dysfunction or dysregulation of SERCA2a is associated with heart failure, while restoring its function is considered as a therapeutic strategy to restore cardiac performance. However, its structure has not yet been determined. Based on native, active protein purified from pig ventricular muscle, we present the first crystal structures of SERCA2a, determined in the CPA-stabilized E2-AlF4- form (3.3 Å) and the Ca2+-occluded [Ca2]E1-AMPPCP form (4.0 Å). The structures are similar to the skeletal muscle isoform SERCA1a pointing to a conserved mechanism. We seek to explain the kinetic differences between SERCA1a and SERCA2a. We find that several isoform-specific residues are acceptor sites for post-translational modifications. In addition, molecular dynamics simulations predict that isoform-specific residues support distinct intramolecular interactions in SERCA2a and SERCA1a. Our experimental observations further indicate that isoform-specific intramolecular interactions are functionally relevant, and may explain the kinetic differences between SERCA2a and SERCA1a.
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Affiliation(s)
- Aljona Sitsel
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.,Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.,Center for Membrane Proteins in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus C, Denmark.,Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Aarhus C, Denmark
| | | | - Nikolaj Düring Drachmann
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.,Center for Membrane Proteins in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus C, Denmark
| | - Rita Derua
- Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.,SyBioMa, KU Leuven, Leuven, Belgium
| | - Susanne Smaardijk
- Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Jacob Lauwring Andersen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.,Center for Membrane Proteins in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus C, Denmark.,Department of Biomedicine, Aarhus University, Aarhus C, Denmark
| | | | - Jialin Chen
- Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | | | - Etienne Waelkens
- Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.,SyBioMa, KU Leuven, Leuven, Belgium
| | - Claus Olesen
- Center for Membrane Proteins in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus C, Denmark .,Department of Biomedicine, Aarhus University, Aarhus C, Denmark
| | - Peter Vangheluwe
- Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Poul Nissen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark .,Center for Membrane Proteins in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus C, Denmark.,Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Aarhus C, Denmark
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8
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Sørensen TLM, Hjorth-Jensen SJ, Oksanen E, Andersen JL, Olesen C, Møller JV, Nissen P. Membrane-protein crystals for neutron diffraction. Acta Crystallogr D Struct Biol 2018; 74:1208-1218. [PMID: 30605135 DOI: 10.1107/s2059798318012561] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 09/05/2018] [Indexed: 11/10/2022]
Abstract
Neutron macromolecular crystallography (NMX) has the potential to provide the experimental input to address unresolved aspects of transport mechanisms and protonation in membrane proteins. However, despite this clear scientific motivation, the practical challenges of obtaining crystals that are large enough to make NMX feasible have so far been prohibitive. Here, the potential impact on feasibility of a more powerful neutron source is reviewed and a strategy for obtaining larger crystals is formulated, exemplified by the calcium-transporting ATPase SERCA1. The challenges encountered at the various steps in the process from crystal nucleation and growth to crystal mounting are explored, and it is demonstrated that NMX-compatible membrane-protein crystals can indeed be obtained.
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Affiliation(s)
- Thomas Lykke Møller Sørensen
- Department of Molecular Biology and Genetics - DANDRITE, Aarhus University, Gustav Wieds Vej 10, DK-8000 Aarhus C, Denmark
| | - Samuel John Hjorth-Jensen
- Department of Molecular Biology and Genetics - DANDRITE, Aarhus University, Gustav Wieds Vej 10, DK-8000 Aarhus C, Denmark
| | - Esko Oksanen
- European Spallation Source ERIC, PO Box 176, 22100 Lund, Sweden
| | | | - Claus Olesen
- Department of Biomedicine, Aarhus University, Ole Worn Alle 3, DK-8000 Aarhus C, Denmark
| | - Jesper Vuust Møller
- Department of Biomedicine, Aarhus University, Ole Worn Alle 3, DK-8000 Aarhus C, Denmark
| | - Poul Nissen
- Department of Molecular Biology and Genetics - DANDRITE, Aarhus University, Gustav Wieds Vej 10, DK-8000 Aarhus C, Denmark
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9
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Midtgaard SR, Darwish TA, Pedersen MC, Huda P, Larsen AH, Jensen GV, Kynde SAR, Skar‐Gislinge N, Nielsen AJZ, Olesen C, Blaise M, Dorosz JJ, Thorsen TS, Venskutonytė R, Krintel C, Møller JV, Frielinghaus H, Gilbert EP, Martel A, Kastrup JS, Jensen PE, Nissen P, Arleth L. Invisible detergents for structure determination of membrane proteins by small‐angle neutron scattering. FEBS J 2017; 285:357-371. [DOI: 10.1111/febs.14345] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 10/20/2017] [Accepted: 11/21/2017] [Indexed: 12/23/2022]
Affiliation(s)
- Søren Roi Midtgaard
- Structural Biophysics X‐ray and Neutron Science The Niels Bohr Institute University of Copenhagen Denmark
| | - Tamim A. Darwish
- National Deuteration Facility Australian Nuclear Science and Technology Organization Lucas Heights Australia
| | - Martin Cramer Pedersen
- Structural Biophysics X‐ray and Neutron Science The Niels Bohr Institute University of Copenhagen Denmark
- Department of Applied Mathematics Research School of Physics and Engineering Australian National University Canberra Australia
| | - Pie Huda
- Structural Biophysics X‐ray and Neutron Science The Niels Bohr Institute University of Copenhagen Denmark
| | - Andreas Haahr Larsen
- Structural Biophysics X‐ray and Neutron Science The Niels Bohr Institute University of Copenhagen Denmark
| | - Grethe Vestergaard Jensen
- Structural Biophysics X‐ray and Neutron Science The Niels Bohr Institute University of Copenhagen Denmark
| | | | - Nicholas Skar‐Gislinge
- Structural Biophysics X‐ray and Neutron Science The Niels Bohr Institute University of Copenhagen Denmark
| | | | - Claus Olesen
- Department of Biomedicine Aarhus University Denmark
| | - Mickael Blaise
- Institut de Recherche en Infectiologie de Montpellier CNRS Université de Montpellier France
- Centre for Carbohydrate Recognition and Signaling Department of Molecular Biology Aarhus University Denmark
| | - Jerzy Józef Dorosz
- Department of Drug Design and Pharmacology Faculty of Health and Medical Sciences University of Copenhagen Denmark
| | - Thor Seneca Thorsen
- Department of Drug Design and Pharmacology Faculty of Health and Medical Sciences University of Copenhagen Denmark
| | - Raminta Venskutonytė
- Department of Drug Design and Pharmacology Faculty of Health and Medical Sciences University of Copenhagen Denmark
| | - Christian Krintel
- Department of Drug Design and Pharmacology Faculty of Health and Medical Sciences University of Copenhagen Denmark
| | - Jesper V. Møller
- Department of Biomedicine Aarhus University Denmark
- Department of Molecular Biology and Genetics Centre for Membrane Pumps in Cells and Disease – PUMPkin Danish National Research Foundation Aarhus University Denmark
| | | | - Elliot Paul Gilbert
- Australian Centre for Neutron Scattering Australian Nuclear Science and Technology Organization Lucas Heights Australia
| | | | - Jette Sandholm Kastrup
- Department of Drug Design and Pharmacology Faculty of Health and Medical Sciences University of Copenhagen Denmark
| | - Poul Erik Jensen
- Copenhagen Plant Science Center University of Copenhagen Denmark
| | - Poul Nissen
- Department of Molecular Biology and Genetics Centre for Membrane Pumps in Cells and Disease – PUMPkin Danish National Research Foundation Aarhus University Denmark
- DANDRITE Nordic‐EMBL Partnership for Molecular Medicine Aarhus University Denmark
| | - Lise Arleth
- Structural Biophysics X‐ray and Neutron Science The Niels Bohr Institute University of Copenhagen Denmark
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10
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Sehgal P, Szalai P, Olesen C, Praetorius HA, Nissen P, Christensen SB, Engedal N, Møller JV. Inhibition of the sarco/endoplasmic reticulum (ER) Ca 2+-ATPase by thapsigargin analogs induces cell death via ER Ca 2+ depletion and the unfolded protein response. J Biol Chem 2017; 292:19656-19673. [PMID: 28972171 DOI: 10.1074/jbc.m117.796920] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 09/15/2017] [Indexed: 11/06/2022] Open
Abstract
Calcium (Ca2+) is a fundamental regulator of cell signaling and function. Thapsigargin (Tg) blocks the sarco/endoplasmic reticulum (ER) Ca2+-ATPase (SERCA), disrupts Ca2+ homeostasis, and causes cell death. However, the exact mechanisms whereby SERCA inhibition induces cell death are incompletely understood. Here, we report that low (0.1 μm) concentrations of Tg and Tg analogs with various long-chain substitutions at the O-8 position extensively inhibit SERCA1a-mediated Ca2+ transport. We also found that, in both prostate and breast cancer cells, exposure to Tg or Tg analogs for 1 day caused extensive drainage of the ER Ca2+ stores. This Ca2+ depletion was followed by markedly reduced cell proliferation rates and morphological changes that developed over 2-4 days and culminated in cell death. Interestingly, these changes were not accompanied by bulk increases in cytosolic Ca2+ levels. Moreover, knockdown of two key store-operated Ca2+ entry (SOCE) components, Orai1 and STIM1, did not reduce Tg cytotoxicity, indicating that SOCE and Ca2+ entry are not critical for Tg-induced cell death. However, we observed a correlation between the abilities of Tg and Tg analogs to deplete ER Ca2+ stores and their detrimental effects on cell viability. Furthermore, caspase activation and cell death were associated with a sustained unfolded protein response. We conclude that ER Ca2+ drainage and sustained unfolded protein response activation are key for initiation of apoptosis at low concentrations of Tg and Tg analogs, whereas high cytosolic Ca2+ levels and SOCE are not required.
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Affiliation(s)
- Pankaj Sehgal
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark.,Biology Platform, Sunnybrook Research Institute, and Department of Biochemistry, University of Toronto, Toronto, Ontario M4N 3M5, Canada.,Centre for Membrane Pumps in Cells and Disease (Pumpkin), Danish Research Foundation, DK-8000 Aarhus, Denmark
| | - Paula Szalai
- Centre for Molecular Medicine Norway (NCMM), Nordic European Molecular Biology Laboratory (EMBL) Partnership for Molecular Medicine, University of Oslo, P. O. Box 1137 Blindern, 0318 Oslo, Norway
| | - Claus Olesen
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark.,Centre for Membrane Pumps in Cells and Disease (Pumpkin), Danish Research Foundation, DK-8000 Aarhus, Denmark
| | - Helle A Praetorius
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark
| | - Poul Nissen
- Centre for Membrane Pumps in Cells and Disease (Pumpkin), Danish Research Foundation, DK-8000 Aarhus, Denmark.,Danish Research Institute of Translational Neuroscience (DANDRITE), Nordic EMBL Partnership for Molecular Medicine, Department of Molecular Biology and Genetics, DK-8000 Aarhus, Denmark, and
| | | | - Nikolai Engedal
- Centre for Molecular Medicine Norway (NCMM), Nordic European Molecular Biology Laboratory (EMBL) Partnership for Molecular Medicine, University of Oslo, P. O. Box 1137 Blindern, 0318 Oslo, Norway,
| | - Jesper V Møller
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark, .,Centre for Membrane Pumps in Cells and Disease (Pumpkin), Danish Research Foundation, DK-8000 Aarhus, Denmark
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11
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Clausen JD, Bublitz M, Arnou B, Olesen C, Andersen JP, Møller JV, Nissen P. Crystal Structure of the Vanadate-Inhibited Ca(2+)-ATPase. Structure 2016; 24:617-623. [PMID: 27050689 DOI: 10.1016/j.str.2016.02.018] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Revised: 02/09/2016] [Accepted: 02/25/2016] [Indexed: 11/25/2022]
Abstract
Vanadate is the hallmark inhibitor of the P-type ATPase family; however, structural details of its inhibitory mechanism have remained unresolved. We have determined the crystal structure of sarcoplasmic reticulum Ca(2+)-ATPase with bound vanadate in the absence of Ca(2+). Vanadate is bound at the catalytic site as a planar VO3(-) in complex with water and Mg(2+) in a dephosphorylation transition-state-like conformation. Validating bound VO3(-) by anomalous difference Fourier maps using long-wavelength data we also identify a hitherto undescribed Cl(-) site near the dephosphorylation site. Crystallization was facilitated by trinitrophenyl (TNP)-derivatized nucleotides that bind with the TNP moiety occupying the binding pocket that normally accommodates the adenine of ATP, rationalizing their remarkably high affinity for E2P-like conformations of the Ca(2+)-ATPase. A comparison of the configurations of bound nucleotide analogs in the E2·VO3(-) structure with that in E2·BeF3(-) (E2P ground state analog) reveals multiple binding modes to the Ca(2+)-ATPase.
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Affiliation(s)
- Johannes D Clausen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark; Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | - Maike Bublitz
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark
| | - Bertrand Arnou
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark
| | - Claus Olesen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark; Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | | | - Jesper Vuust Møller
- Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark; Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | - Poul Nissen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark; Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, 8000 Aarhus, Denmark.
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12
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Vangkilde A, Jepsen JRM, Schmock H, Olesen C, Arnarsdóttir S, Baaré WFC, Plessen KJ, Didriksen M, Siebner HR, Werge T, Olsen L. Associations between social cognition, skills, and function and subclinical negative and positive symptoms in 22q11.2 deletion syndrome. J Neurodev Disord 2016; 8:42. [PMID: 27891188 PMCID: PMC5112709 DOI: 10.1186/s11689-016-9175-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Accepted: 11/01/2016] [Indexed: 12/31/2022] Open
Abstract
Background Identification of the early signs of schizophrenia would be a major achievement for the early intervention and prevention strategies in psychiatry. Social impairments are defining features of schizophrenia. Impairments of individual layers of social competencies are frequently described in individuals with 22q11.2 deletion syndrome (22q11.2DS), who have high risk of schizophrenia. It is unclear whether and to what extent social impairments associate with subclinical negative and positive symptoms in 22q11.2DS, and which layer of social impairments are more correlated with schizophrenia-related symptoms. The aims of this study were to conduct a comprehensive investigation of social impairments at three different levels (function, skill, and cognition) and their interrelationship and to determine to what degree the social impairments correlate to subclinical levels of negative and positive symptoms, respectively, in a young cohort of 22q11.2DS not diagnosed with schizophrenia. Methods The level of social impairment was addressed using questionnaires and objective measures of social functioning (The Adaptive Behavior Assessment System), skills (Social Responsiveness Scale), and cognition (The Awareness of Social Inference Test and CANTAB Emotional Recognition Task), and the presence of subclinical symptoms of schizophrenia were evaluated using the Structured Interview for Prodromal Syndromes in a cross-sectional case-control study of 29 cases and 29 controls, aged 12 to 25 years. Association between social impairment and negative and positive symptoms levels was examined in cases only. Results Subjects with 22q11.2DS were highly impaired in social function, social skills, and social cognition (p ≤ 6.2 × 10−9) relative to control peers and presented with more negative (p = 5.8 × 10−11) and positive (p = 7.5 × 10−4) symptoms. In particular, social functional and skill levels were highly associated with notably subclinical negative symptoms levels. Conclusions This study shows strong correlations between levels of social impairments and subclinical negative and positive symptoms. However, longitudinal studies are required to show if social impairments represent early disease manifestations. If parental or self-reporting suggests severe social impairment, it should advocate for clinical awareness not only to social deficits per se but also of potential subclinical psychosis symptoms.
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Affiliation(s)
- A Vangkilde
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Copenhagen University Hospital, Mental Health Services, Capital Region of Denmark, Boserupvej 2, 4000 Roskilde, Denmark ; The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Copenhagen Denmark
| | - J R M Jepsen
- Child and Adolescent Mental Health Center, Copenhagen University Hospital, Mental Health Services, Capital Region of Denmark, Bispebjerg Bakke 30, 2400 Copenhagen NV, Denmark ; Lundbeck Foundation Center for Clinical Intervention and Neuropsychiatric Schizophrenia Research (CINS) and Center for Neuropsychiatric Schizophrenia Research (CNSR), Copenhagen University Hospital, Mental Health Services, Capital Region of Denmark, Ndr. Ringvej 29-67, 2600 Glostrup, Denmark
| | - H Schmock
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Copenhagen University Hospital, Mental Health Services, Capital Region of Denmark, Boserupvej 2, 4000 Roskilde, Denmark ; The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Copenhagen Denmark
| | - C Olesen
- Department of Pediatrics, Aarhus University Hospital, Palle Juul-Jensens Blvd. 99, 8200 Aarhus N, Denmark
| | - S Arnarsdóttir
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Copenhagen University Hospital, Mental Health Services, Capital Region of Denmark, Boserupvej 2, 4000 Roskilde, Denmark ; deCODE genetics, Amgen, Sturlugata 8, 101 Reykjavik, Iceland
| | - W F C Baaré
- Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital, Kettegaard Allé 30, 2650 Hvidovre, Denmark
| | - K J Plessen
- Child and Adolescent Mental Health Center, Copenhagen University Hospital, Mental Health Services, Capital Region of Denmark, Bispebjerg Bakke 30, 2400 Copenhagen NV, Denmark ; Department of Clinical Medicine, University of Copenhagen, Blegdamsvej 3B, 2200 København N, Denmark
| | - M Didriksen
- H. Lundbeck A/S, Ottiliavej 9, 2500 Valby, Denmark
| | - H R Siebner
- Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital, Kettegaard Allé 30, 2650 Hvidovre, Denmark ; Department of Neurology, Copenhagen University Hospital Bispebjerg, Bispebjerg Bakke 23, 2400 Copenhagen NV, Denmark
| | - T Werge
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Copenhagen University Hospital, Mental Health Services, Capital Region of Denmark, Boserupvej 2, 4000 Roskilde, Denmark ; The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Copenhagen Denmark ; Department of Pediatrics, Aarhus University Hospital, Palle Juul-Jensens Blvd. 99, 8200 Aarhus N, Denmark
| | - L Olsen
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Copenhagen University Hospital, Mental Health Services, Capital Region of Denmark, Boserupvej 2, 4000 Roskilde, Denmark ; The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Copenhagen Denmark
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13
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Abstract
The chapter describes procedures useful for determination of Ca(2+) binding by membranous Ca(2+)-ATPase based on the correction for the removal of Ca(2+) present in a non-bound state in the suspension medium. This is done by a filtration procedure that retains the membranous material on the Millipore filters. With suitable sucking devices it is possible to gently remove without dehydration nearly all medium from the Ca(2+) containing membranes, except that required for wetting of the filters on which they are deposited. Correction for this effect can be done with a double-filter where the radioactive content of the lower (protein-free) filter is subtracted from that present in the upper filter for calculation of Ca(2+) binding. This methodology can be used to study the effect of inhibitors on Ca(2+) binding and -transport, and with Ca(2+)/EGTA buffers to explore the Ca(2+) binding affinities and cooperative aspects of the two transport sites.
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Affiliation(s)
- Pankaj Sehgal
- Department of Biomedicine, Aarhus University, Aarhus C, Denmark
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus C, Denmark
| | - Claus Olesen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus C, Denmark
- Centre for Membrane Pumps in Cells and Disease, Danish National Research Foundation, Aarhus University, Aarhus C, Denmark
| | - Jesper V Møller
- Department of Biomedicine, Aarhus University, Aarhus C, Denmark.
- Centre for Membrane Pumps in Cells and Disease, Danish National Research Foundation, Aarhus University, Aarhus C, Denmark.
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14
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Drachmann ND, Olesen C. Lipid Exchange by Ultracentrifugation. Methods Mol Biol 2016; 1377:397-402. [PMID: 26695050 DOI: 10.1007/978-1-4939-3179-8_35] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Lipids play an important role in maintaining P-type ATPase structure and function, and often they are crucial for ATPase activity. When the P-type ATPases are in the membrane, they are surrounded by a mix of different lipid species with varying aliphatic chain lengths and saturation, and the complex interplay between the lipids and the P-type ATPases are still not well understood. We here describe a robust method to exchange the majority of the lipids surrounding the ATPase after solubilisation and/or purification with a target lipid of interest. The method is based on an ultracentrifugation step, where the protein sample is spun through a dense buffer containing large excess of the target lipid, which results in an approximately 80-85 % lipid exchange. The method is a very gently technique that maintains protein folding during the process, hence allowing further characterization of the protein in the presence of a target lipid of interest.
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Affiliation(s)
- Nikolaj Düring Drachmann
- Centre for Membrane Pumps in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus, Denmark. .,Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, United Kingdom.
| | - Claus Olesen
- Centre for Membrane Pumps in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
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15
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Sehgal P, Olesen C, Møller JV. Tryptophan Fluorescence Changes Related to Ca(2+)-ATPase Function. Methods Mol Biol 2016; 1377:227-30. [PMID: 26695036 DOI: 10.1007/978-1-4939-3179-8_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Fluorescence measurements as monitored with either extrinsic or intrinsic probes constitute important ways with which to study the molecular properties of macromolecules. With high-quality spectrofluorimeters, it is, e.g., possible kinetically to follow local conformational changes, induced by ligands and inhibitors, with a sensitivity that is unsurpassed by any other physicochemical technique. We demonstrate here with Ca(2+) and two specific inhibitors of SERCA how this can be done by measurements of the intrinsic fluorescence of the tryptophan residues of SERCA.
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Affiliation(s)
- Pankaj Sehgal
- Department of Biomedicine, Aarhus University, Aarhus C, Denmark.,Centre for Membrane Pumps in Cells and Disease, Danish National Research Foundation, Aarhus C, Denmark
| | - Claus Olesen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus C, Denmark.,Centre for Membrane Pumps in Cells and Disease, Danish National Research Foundation, Aarhus C, Denmark
| | - Jesper V Møller
- Department of Biomedicine, Aarhus University, Aarhus C, Denmark. .,Centre for Membrane Pumps in Cells and Disease, Danish National Research Foundation, Aarhus C, Denmark.
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16
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Bublitz M, Nass K, Drachmann ND, Markvardsen AJ, Gutmann MJ, Barends TRM, Mattle D, Shoeman RL, Doak RB, Boutet S, Messerschmidt M, Seibert MM, Williams GJ, Foucar L, Reinhard L, Sitsel O, Gregersen JL, Clausen JD, Boesen T, Gotfryd K, Wang KT, Olesen C, Møller JV, Nissen P, Schlichting I. Structural studies of P-type ATPase-ligand complexes using an X-ray free-electron laser. IUCrJ 2015; 2:409-20. [PMID: 26175901 PMCID: PMC4491313 DOI: 10.1107/s2052252515008969] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 05/08/2015] [Indexed: 05/24/2023]
Abstract
Membrane proteins are key players in biological systems, mediating signalling events and the specific transport of e.g. ions and metabolites. Consequently, membrane proteins are targeted by a large number of currently approved drugs. Understanding their functions and molecular mechanisms is greatly dependent on structural information, not least on complexes with functionally or medically important ligands. Structure determination, however, is hampered by the difficulty of obtaining well diffracting, macroscopic crystals. Here, the feasibility of X-ray free-electron-laser-based serial femtosecond crystallography (SFX) for the structure determination of membrane protein-ligand complexes using microcrystals of various native-source and recombinant P-type ATPase complexes is demonstrated. The data reveal the binding sites of a variety of ligands, including lipids and inhibitors such as the hallmark P-type ATPase inhibitor orthovanadate. By analyzing the resolution dependence of ligand densities and overall model qualities, SFX data quality metrics as well as suitable refinement procedures are discussed. Even at relatively low resolution and multiplicity, the identification of ligands can be demonstrated. This makes SFX a useful tool for ligand screening and thus for unravelling the molecular mechanisms of biologically active proteins.
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Affiliation(s)
- Maike Bublitz
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
| | - Karol Nass
- Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany
| | - Nikolaj D. Drachmann
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
| | | | - Matthias J. Gutmann
- Rutherford Appleton Laboratory, ISIS Facility, Chilton, Didcot OX11 0QX, England
| | - Thomas R. M. Barends
- Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany
| | - Daniel Mattle
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
| | - Robert L. Shoeman
- Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany
| | - R. Bruce Doak
- Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - Sébastien Boutet
- Linac Coherent Light Source, LCLS, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Marc Messerschmidt
- Linac Coherent Light Source, LCLS, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Marvin M. Seibert
- Linac Coherent Light Source, LCLS, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Garth J. Williams
- Linac Coherent Light Source, LCLS, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Lutz Foucar
- Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany
| | - Linda Reinhard
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
| | - Oleg Sitsel
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
| | - Jonas L. Gregersen
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
| | - Johannes D. Clausen
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
- Department of Biomedicine, Aarhus University, Ole Worms Allé 3, 8000 Aarhus C, Denmark
| | - Thomas Boesen
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
| | - Kamil Gotfryd
- Department of Neuroscience and Pharmacology, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen, Denmark
| | - Kai-Tuo Wang
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
| | - Claus Olesen
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
- Department of Biomedicine, Aarhus University, Ole Worms Allé 3, 8000 Aarhus C, Denmark
| | - Jesper V. Møller
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
- Department of Biomedicine, Aarhus University, Ole Worms Allé 3, 8000 Aarhus C, Denmark
| | - Poul Nissen
- Department of Molecular Biology and Genetics, Centre for Membrane Pumps in Cells and Disease – PUMPkin, Danish National Research Foundation, Aarhus University, Gustav Wieds Vej 10c, 8000 Aarhus C, Denmark
- DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark
| | - Ilme Schlichting
- Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany
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17
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De Ford C, Calderón C, Sehgal P, Fedosova NU, Murillo R, Olesen C, Nissen P, Møller JV, Merfort I. Discovery of Tricyclic Clerodane Diterpenes as Sarco/Endoplasmic Reticulum Ca(2+)-ATPase Inhibitors and Structure-Activity Relationships. J Nat Prod 2015; 78:1262-1270. [PMID: 25993619 DOI: 10.1021/acs.jnatprod.5b00062] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Tricyclic clerodane diterpenes (TCDs) are natural compounds that often show potent cytotoxicity for cancer cells, but their mode of action remains elusive. A computationally based similarity search (CDRUG), combined with principal component analysis (ChemGPS-NP) and docking calculations (GOLD 5.2), suggested TCDs to be inhibitors of the sarco/endoplasmic reticulum Ca(2+)-ATPase (SERCA) pump, which is also the target of the sesquiterpene lactone thapsigargin. Biochemical studies were performed with 11 TCDs on purified rabbit skeletal muscle sarcoplasmic reticulum membranes, which are highly enriched with the SERCA1a isoform. Casearborin D (2) exhibited the highest affinity, with a KD value of 2 μM and giving rise to complete inhibition of SERCA1a activity. Structure-activity relationships revealed that functionalization of two acyl side chains (R1 and R4) and the hydrophobicity imparted by the aliphatic chain at C-9, as well as a C-3,C-4 double bond, play crucial roles for inhibitory activity. Docking studies also suggested that hydrophobic interactions in the binding site, especially with Phe256 and Phe834, may be important for a strong inhibitory activity of the TCDs. In conclusion, a novel class of SERCA inhibitory compounds is presented.
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Affiliation(s)
- Christian De Ford
- †Department of Pharmaceutical Biology and Biotechnology, Albert Ludwigs University Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany
- ‡Spemann Graduate School of Biology and Medicine (SGBM), Albert Ludwigs University Freiburg, Albertstrasse 19a, 79104 Freiburg, Germany
- §Faculty of Chemistry and Pharmacy, Albert Ludwigs University Freiburg, Albertstrasse 25, 79104 Freiburg, Germany
| | - Carlos Calderón
- #Escuela de Química and CIPRONA, Universidad de Costa Rica, 2060 San José, Costa Rica
| | - Pankaj Sehgal
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Natalya U Fedosova
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Renato Murillo
- #Escuela de Química and CIPRONA, Universidad de Costa Rica, 2060 San José, Costa Rica
| | - Claus Olesen
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Poul Nissen
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Jesper V Møller
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Irmgard Merfort
- †Department of Pharmaceutical Biology and Biotechnology, Albert Ludwigs University Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany
- ‡Spemann Graduate School of Biology and Medicine (SGBM), Albert Ludwigs University Freiburg, Albertstrasse 19a, 79104 Freiburg, Germany
- §Faculty of Chemistry and Pharmacy, Albert Ludwigs University Freiburg, Albertstrasse 25, 79104 Freiburg, Germany
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18
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Montigny C, Decottignies P, Le Maréchal P, Capy P, Bublitz M, Olesen C, Møller JV, Nissen P, le Maire M. S-palmitoylation and s-oleoylation of rabbit and pig sarcolipin. J Biol Chem 2014; 289:33850-61. [PMID: 25301946 DOI: 10.1074/jbc.m114.590307] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Sarcolipin (SLN) is a regulatory peptide present in sarcoplasmic reticulum (SR) from skeletal muscle of animals. We find that native rabbit SLN is modified by a fatty acid anchor on Cys-9 with a palmitic acid in about 60% and, surprisingly, an oleic acid in the remaining 40%. SLN used for co-crystallization with SERCA1a (Winther, A. M., Bublitz, M., Karlsen, J. L., Moller, J. V., Hansen, J. B., Nissen, P., and Buch-Pedersen, M. J. (2013) Nature 495, 265-2691; Ref. 1) is also palmitoylated/oleoylated, but is not visible in crystal structures, probably due to disorder. Treatment with 1 m hydroxylamine for 1 h removes the fatty acids from a majority of the SLN pool. This treatment did not modify the SERCA1a affinity for Ca(2+) but increased the Ca(2+)-dependent ATPase activity of SR membranes indicating that the S-acylation of SLN or of other proteins is required for this effect on SERCA1a. Pig SLN is also fully palmitoylated/oleoylated on its Cys-9 residue, but in a reverse ratio of about 40/60. An alignment of 67 SLN sequences from the protein databases shows that 19 of them contain a cysteine and the rest a phenylalanine at position 9. Based on a cladogram, we postulate that the mutation from phenylalanine to cysteine in some species is the result of an evolutionary convergence. We suggest that, besides phosphorylation, S-acylation/deacylation also regulates SLN activity.
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Affiliation(s)
- Cédric Montigny
- From the Laboratoire des Protéines Membranaires, UMR 8221, Commissariat à l'Energie Atomique (CEA), Université Paris-Sud and Centre National de la Recherche Scientifique (CNRS), F91191, Gif-sur-Yvette, France
| | - Paulette Decottignies
- Institut de Biochimie et Biophysique Moléculaire et Cellulaire, CNRS UMR 8619, Université Paris-Sud, F91400, Orsay, France
| | - Pierre Le Maréchal
- Institut de Biochimie et Biophysique Moléculaire et Cellulaire, CNRS UMR 8619, Université Paris-Sud, F91400, Orsay, France
| | - Pierre Capy
- Laboratoire Evolution, Génomes et Spéciation, CNRS UPR 9034, Centre de Recherche de Gif and Université Paris-Sud, F91190, Gif-sur-Yvette, France
| | - Maike Bublitz
- Centre for Membrane Pumps in Cells and Disease, PUMPKIN, Danish National Research Foundation, Department of Molecular Biology and Genetics, and
| | - Claus Olesen
- Centre for Membrane Pumps in Cells and Disease, PUMPKIN, Danish National Research Foundation, Department of Molecular Biology and Genetics, and Department of Biomedicine, Aarhus University, 8000, Aarhus, Denmark
| | - Jesper Vuust Møller
- Centre for Membrane Pumps in Cells and Disease, PUMPKIN, Danish National Research Foundation, Department of Molecular Biology and Genetics, and
| | - Poul Nissen
- Centre for Membrane Pumps in Cells and Disease, PUMPKIN, Danish National Research Foundation, Department of Molecular Biology and Genetics, and
| | - Marc le Maire
- From the Laboratoire des Protéines Membranaires, UMR 8221, Commissariat à l'Energie Atomique (CEA), Université Paris-Sud and Centre National de la Recherche Scientifique (CNRS), F91191, Gif-sur-Yvette, France,
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Drachmann ND, Olesen C, Møller JV, Guo Z, Nissen P, Bublitz M. Comparing crystal structures of Ca(2+) -ATPase in the presence of different lipids. FEBS J 2014; 281:4249-62. [PMID: 25103814 DOI: 10.1111/febs.12957] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 08/03/2014] [Accepted: 08/04/2014] [Indexed: 12/01/2022]
Abstract
The activity of the sarco/endoplasmic reticulum Ca(2+) -ATPase (SERCA) depends strongly on the lipid composition of the surrounding membrane. Yet, structural information on SERCA-lipid interaction is still relatively scarce, and the influence of different lipids on the enzyme is not well understood. We have analyzed SERCA crystal structures in the presence of four different phosphatidylcholine lipids of different lengths and double-bond compositions, and we find three different binding sites for lipid head groups, which are apparently independent of the acyl moiety of the lipids used. By comparison with other available SERCA structures with bound lipids, we find a total of five recurring sites, two of which are specific to certain conformational states of the enzyme, two others are state-independent, and one is a crucial site for crystal formation. Three of the binding sites overlap with or are in close vicinity to known binding sites for various SERCA-specific inhibitors and regulators, e.g. thapsigargin, sarcolipin/phospholamban and cyclopiazonic acid. Whereas the transient sites are amenable to a transient, regulatory influence of lipid molecules, the state-independent sites probably provide a flexible anchoring of the protein in the fluid bilayer.
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Affiliation(s)
- Nikolaj D Drachmann
- Centre for Membrane Pumps in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus, Denmark; Department of Molecular Biology and Genetics, Aarhus University, Denmark
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Sørensen JL, Knudsen M, Hansen FT, Olesen C, Fuertes PR, Lee TV, Sondergaard TE, Pedersen CNS, Brodersen DE, Giese H. Fungal NRPS-Dependent Siderophores: From Function to Prediction. Fungal Biol 2014. [DOI: 10.1007/978-1-4939-1191-2_15] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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21
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Dubois C, Vanden Abeele F, Sehgal P, Olesen C, Junker S, Christensen SB, Prevarskaya N, Møller JV. Differential effects of thapsigargin analogues on apoptosis of prostate cancer cells: complex regulation by intracellular calcium. FEBS J 2013; 280:5430-40. [PMID: 23927406 DOI: 10.1111/febs.12475] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 07/16/2013] [Accepted: 07/19/2013] [Indexed: 01/28/2023]
Abstract
The inhibition of sarcoplasmic reticulum Ca(2+)-ATPase (SERCA) by thapsigargin (Tg) and Tg-type analogues is considered to trigger cell death by activation of apoptotic pathways. Some of these analogues may be useful as antineoplastic agents after appropriate targeting as peptide conjugated prodrugs to cancer cells. With this in mind, this study evaluates the effect on LNCaP androgen-sensitive cancer cells of thapsigargin substituted with 12-aminododecanoyl linkers and Leu (Leu-8ADT), aspartate (Asp-8ADT) or Boc-8ADT. Our results show that both Leu-8ADT and Asp-8ADT result in rapid ER calcium depletion and an influx of calcium across the plasma membrane by activation of store-operated calcium entry. By contrast, ER Ca(2+) depletion by Boc-8ADT is a very slow process that does not perceptibly increase cytosolic Ca(2+) and activate store-operated calcium entry, because the inhibition of SERCA with this compound is very slow. Nevertheless, we find that Boc-8ADT is a more efficient inducer of apoptosis than both Tg and Leu-8ADT. Compared with Tg and the other analogues, apoptosis induced by Asp-8ADT is very modest, although this compound also activates store-operated calcium entry and at high concentrations (1 μm) causes severe morphological changes, reflecting decreased cell viability. We conclude that many factors need to be considered for optimization of these compounds in antineoplastic drug design. Among these ER stress induced by Ca(2+) endoplasmic reticulum mobilization seems particularly important, whereas the early cytosolic increase of Ca(2+) concentration preceding the executive phase of apoptosis appears to be of no, or little, consequence for a subsequent apoptotic effect.
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Affiliation(s)
- Charlotte Dubois
- Inserm U1003, Equipe labellisée par la Ligue Nationale Contre le Cancer, Université des Sciences et Technologies de Lille (USTL), Villeneuve d'Ascq, France; Center for Membrane Pumps in Cells and Diseases, Danish Research Foundation, Aarhus, Denmark
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22
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Buus K, Harbigg P, Olesen C, Damsgaard E. The effect of pharmaceutical care on three-year mortality a follow-up study. Eur Geriatr Med 2013. [DOI: 10.1016/j.eurger.2013.07.610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Olesen C, Harbig P, Barat I, Damsgaard E. The impact of pharmaceutical care on non-adherence in elderly polypharmacy patients. Eur Geriatr Med 2013. [DOI: 10.1016/j.eurger.2013.07.589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Paulsen ES, Villadsen J, Tenori E, Liu H, Bonde DF, Lie MA, Bublitz M, Olesen C, Autzen HE, Dach I, Sehgal P, Nissen P, Møller JV, Schiøtt B, Christensen SB. Water-mediated interactions influence the binding of thapsigargin to sarco/endoplasmic reticulum calcium adenosinetriphosphatase. J Med Chem 2013; 56:3609-19. [PMID: 23574308 DOI: 10.1021/jm4001083] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A crystal structure suggests four water molecules are present in the binding cavity of thapsigargin in sarco/endoplasmic reticulum calcium ATPase (SERCA). Computational chemistry indicates that three of these water molecules mediate an extensive hydrogen-bonding network between thapsigargin and the backbone of SERCA. The orientation of the thapsigargin molecule in SERCA is crucially dependent on these interactions. The hypothesis has been verified by measuring the affinity of newly synthesized model compounds, which are prevented from participating in such water-mediated interactions as hydrogen-bond donors.
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Affiliation(s)
- Eleonora S Paulsen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark
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Bublitz M, Musgaard M, Poulsen H, Thøgersen L, Olesen C, Schiøtt B, Morth JP, Møller JV, Nissen P. Ion pathways in the sarcoplasmic reticulum Ca2+-ATPase. J Biol Chem 2013; 288:10759-65. [PMID: 23400778 DOI: 10.1074/jbc.r112.436550] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The sarco/endoplasmic reticulum Ca(2+)-ATPase (SERCA) is a transmembrane ion transporter belonging to the P(II)-type ATPase family. It performs the vital task of re-sequestering cytoplasmic Ca(2+) to the sarco/endoplasmic reticulum store, thereby also terminating Ca(2+)-induced signaling such as in muscle contraction. This minireview focuses on the transport pathways of Ca(2+) and H(+) ions across the lipid bilayer through SERCA. The ion-binding sites of SERCA are accessible from either the cytoplasm or the sarco/endoplasmic reticulum lumen, and the Ca(2+) entry and exit channels are both formed mainly by rearrangements of four N-terminal transmembrane α-helices. Recent improvements in the resolution of the crystal structures of rabbit SERCA1a have revealed a hydrated pathway in the C-terminal transmembrane region leading from the ion-binding sites to the cytosol. A comparison of different SERCA conformations reveals that this C-terminal pathway is exclusive to Ca(2+)-free E2 states, suggesting that it may play a functional role in proton release from the ion-binding sites. This is in agreement with molecular dynamics simulations and mutational studies and is in striking analogy to a similar pathway recently described for the related sodium pump. We therefore suggest a model for the ion exchange mechanism in P(II)-ATPases including not one, but two cytoplasmic pathways working in concert.
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Affiliation(s)
- Maike Bublitz
- Centre for Membrane Pumps in Cells and Disease (PUMPkin), Aarhus University, DK-8000 Aarhus C, Denmark
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Denmeade SR, Mhaka AM, Rosen DM, Brennen WN, Dalrymple S, Dach I, Olesen C, Gurel B, Demarzo AM, Wilding G, Carducci MA, Dionne CA, Møller JV, Nissen P, Christensen SB, Isaacs JT. Engineering a prostate-specific membrane antigen-activated tumor endothelial cell prodrug for cancer therapy. Sci Transl Med 2012; 4:140ra86. [PMID: 22745436 DOI: 10.1126/scitranslmed.3003886] [Citation(s) in RCA: 161] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Heterogeneous expression of drug target proteins within tumor sites is a major mechanism of resistance to anticancer therapies. We describe a strategy to selectively inhibit, within tumor sites, the function of a critical intracellular protein, the sarcoplasmic/endoplasmic reticulum calcium adenosine triphosphatase (SERCA) pump, whose proper function is required by all cell types for viability. To achieve targeted inhibition, we took advantage of the unique expression of the carboxypeptidase prostate-specific membrane antigen (PSMA) by tumor endothelial cells within the microenvironment of solid tumors. We generated a prodrug, G202, consisting of a PSMA-specific peptide coupled to an analog of the potent SERCA pump inhibitor thapsigargin. G202 produced substantial tumor regression against a panel of human cancer xenografts in vivo at doses that were minimally toxic to the host. On the basis of these data, a phase 1 dose-escalation clinical trial has been initiated with G202 in patients with advanced cancer.
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Affiliation(s)
- Samuel R Denmeade
- The Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA.
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Olesen C, Harbig P, Barat I, Damsgaard EM. Absence of 'over-the-counter' medicinal products in on-line prescription records: a risk factor of overlooking interactions in the elderly. Pharmacoepidemiol Drug Saf 2012; 22:145-50. [PMID: 23097415 DOI: 10.1002/pds.3362] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 09/25/2012] [Accepted: 10/01/2012] [Indexed: 11/10/2022]
Abstract
PURPOSE To assess possible origins of harmful interactions in elderly patients arising from the current absence of information on over-the-counter (OTC) medicines in the Danish 'on-line prescription record'. METHODS Information on current use of prescription drugs and OTC medicinal products (non-prescription drugs, herbal medicine, dietary supplements, and others) was collected by home visit interviews. The latter OTC products were not listed in an on-line prescription record that covered the previous two years. Information on interactions between OTC medicines and between OTC products and prescription drugs was obtained from the Danish National Drug Interaction Database. RESULTS Of the 309 patients recruited (median age 75 years, interquartile range (IQR) 70-81), 229 (74%) used 568 OTC medicines not listed in the Danish 'on-line prescription record', amongst which we identified 166 potential interactions - between OTC treatments or between OTC and prescription drugs. Fifty percent of patients taking OTC medicines were exposed to potential interactions, i.e. one to three instances per patient. Twenty-five percent of patients exposed to interactions experienced interaction listed as 'Can be used with certain precautions'. CONCLUSION The absence of information on OTC products in an on-line prescription record entails a risk of overlooking interactions in elderly patients. Such products should be included in on-line medication records to prevent adverse effects from interactions. However, online medication records are not available in all countries and as inclusion of data on OTC drugs seem not to be feasible presently. Still, it is highly recommended that the patient's drug list is reviewed on a regular basis.
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Affiliation(s)
- C Olesen
- Department of Geriatrics, Aarhus University Hospital, P.P. Ørums Gade 11, Aarhus C, Denmark.
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28
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Abstract
The H(+),K(+)-ATPase pumps protons or hydronium ions and is responsible for the acidification of the gastric fluid. It is made up of an α-catalytic and a β-glycosylated subunit. The relation between cation translocation and the organization of the protein in the membrane are not well understood. We describe here how pure and functionally active pig gastric H(+),K(+)-ATPase with an apparent Stokes radius of 6.3 nm can be obtained after solubilization with the non-ionic detergent C(12)E(8), followed by exchange of C(12)E(8) with Tween 20 on a Superose 6 column. Mass spectroscopy indicates that the β-subunit bears an excess mass of 9 kDa attributable to glycosylation. From chemical analysis, there are 0.25 g of phospholipids and around 0.024 g of cholesterol bound per g of protein. Analytical ultracentrifugation shows one main complex, sedimenting at s(20,)(w) = 7.2 ± 0.1 S, together with minor amounts of irreversibly aggregated material. From these data, a buoyant molecular mass is calculated, corresponding to an H(+),K(+)-ATPase α,β-protomer of 147.3 kDa. Complementary sedimentation velocity with deuterated water gives a picture of an α,β-protomer with 0.9-1.4 g/g of bound detergent and lipids and a reasonable frictional ratio of 1.5, corresponding to a Stokes radius of 7.1 nm. An α(2),β(2) dimer is rejected by the data. Light scattering coupled to gel filtration confirms the monomeric state of solubilized H(+),K(+)-ATPase. Thus, α,β H(+),K(+)-ATPase is active at least in detergent and may plausibly function as a monomer, as has been established for other P-type ATPases, Ca(2+)-ATPase and Na(+),K(+)-ATPase.
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Affiliation(s)
- Ingrid Dach
- Center for Membrane Pumps in Cells and Diseases, Danish Research Foundation, DK-8000 Aarhus, Denmark
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Olesen C, Harbig P, Barat I, Damsgaard E. Generic substitution appears to increase adherence in elderly patients with polypharmacy. Eur Geriatr Med 2012. [DOI: 10.1016/j.eurger.2012.07.276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bublitz M, Musgaard M, Arnou B, Poulsen H, Olesen C, Morth JP, Møller JV, Nissen P. A C-terminal pathway in the calcium pump. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311081244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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31
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Jurková I, Olesen C, Nissen P, Møller JV. Inhibition of the sarcoplasmic reticulum Ca 2+-ATPase by thapsigargin analogues. Acta Crystallogr A 2011. [DOI: 10.1107/s010876731108130x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Sonntag Y, Musgaard M, Olesen C, Schiøtt B, Møller JV, Nissen P, Thøgersen L. Mutual adaptation of a membrane protein and its lipid bilayer during conformational changes. Nat Commun 2011; 2:304. [DOI: 10.1038/ncomms1307] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Accepted: 04/11/2011] [Indexed: 11/09/2022] Open
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Liu XY, Gourdon P, Andersen JL, Bublitz M, Pedersen BP, Yatime L, Nyblom M, Olesen C, Møller JV, Nissen P, Morth JP. A systematic approach to membrane protein crystallization in bilayers. Acta Crystallogr A 2010. [DOI: 10.1107/s010876731009971x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Winther AML, Liu H, Sonntag Y, Olesen C, le Maire M, Soehoel H, Olsen CE, Christensen SB, Nissen P, Møller JV. Critical roles of hydrophobicity and orientation of side chains for inactivation of sarcoplasmic reticulum Ca2+-ATPase with thapsigargin and thapsigargin analogs. J Biol Chem 2010; 285:28883-92. [PMID: 20551329 DOI: 10.1074/jbc.m110.136242] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Thapsigargin (Tg), a specific inhibitor of sarco/endoplasmic Ca(2+)-ATPases (SERCA), binds with high affinity to the E2 conformation of these ATPases. SERCA inhibition leads to elevated calcium levels in the cytoplasm, which in turn induces apoptosis. We present x-ray crystallographic and intrinsic fluorescence data to show how Tg and chemical analogs of the compound with modified or removed side chains bind to isolated SERCA 1a membranes. This occurs by uptake via the membrane lipid followed by insertion into a resident intramembranous binding site with few adaptative changes. Our binding data indicate that a balanced hydrophobicity and accurate positioning of the side chains, provided by the central guaianolide ring structure, defines a pharmacophore of Tg that governs both high affinity and access to the protein-binding site. Tg analogs substituted with long linkers at O-8 extend from the binding site between transmembrane segments to the putative N-terminal Ca(2+) entry pathway. The long chain analogs provide a rational basis for the localization of the linker, the presence of which is necessary for enabling prostate-specific antigen to cleave peptide-conjugated prodrugs targeting SERCA of cancer cells (Denmeade, S. R., Jakobsen, C. M., Janssen, S., Khan, S. R., Garrett, E. S., Lilja, H., Christensen, S. B., and Isaacs, J. T. (2003) J. Natl. Cancer Inst. 95, 990-1000). Our study demonstrates the usefulness of a simple in vitro system to test and direct development toward the formulation of new Tg derivatives with improved properties for SERCA targeting. Finally, we propose that the Tg binding pocket may be a regulatory site that, for example, is sensitive to cholesterol.
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Affiliation(s)
- Anne-Marie L Winther
- Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation, Denmark
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Sonntag Y, Musgaard M, Olesen C, Møller JV, Schiøtt B, Nissen P, Thøgersen L. Ca2+-Atpase: Lipid-Protein Interaction As Observed in Crystals and MD Simulations. Biophys J 2010. [DOI: 10.1016/j.bpj.2009.12.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Møller JV, Olesen C, Winther AML, Nissen P. What can be learned about the function of a single protein from its various X-ray structures: the example of the sarcoplasmic calcium pump. Methods Mol Biol 2010; 654:119-40. [PMID: 20665264 DOI: 10.1007/978-1-60761-762-4_7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Improvements in the handling of membrane proteins for crystallization, combined with better synchrotron sources for X-ray diffraction analysis, are leading to clarification of the structural details of an ever increasing number of membrane transporters and receptors. Here we describe how this development has resulted in the elucidation at atomic resolution of a large number of structures of the sarcoplasmic Ca(2+)-ATPase (SERCA1a) present in skeletal muscle. The structures corresponding to the various intermediary states have been obtained after stabilization with structural analogues of ATP and of metal fluorides as mimicks of inorganic phosphate. From these results it is possible, in accordance with previous biochemical and molecular biology data, to give a detailed structural description of both ATP hydrolysis and Ca(2+) transport through the membrane, to serve as the starting point for a fuller understanding of the pump mechanism and, in future studies, on the regulatory role of this ubiquitous intracellular Ca(2+)-ATPase in cellular Ca(2+) metabolism in normal and pathological conditions.
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Affiliation(s)
- Jesper Vuust Møller
- Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Copenhagen, Denmark.
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Boesecke P, Bois JM, Crépin T, Hunte C, Kahn R, Kao WC, Nauton L, Winther AML, Moller J, Nissen P, Nury H, Olesen C, Pebay-Peyroula E, Vicat J, Stuhrmann H. A first low-resolution difference Fourier map of phosphorus in a membrane protein from near-edge anomalous diffraction. J Synchrotron Radiat 2009; 16:658-665. [PMID: 19713640 DOI: 10.1107/s0909049509025692] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Accepted: 07/02/2009] [Indexed: 05/28/2023]
Abstract
Crystal diffraction of three membrane proteins (cytochrome bc(1) complex, sarcoplasmic reticulum Ca(2+) ATPase, ADP-ATP carrier) and of one nucleoprotein complex (leucyl tRNA synthetase bound to tRNAleu, leuRS:tRNAleu) was tested at wavelengths near the X-ray K-absorption edge of phosphorus using a new set-up for soft X-ray diffraction at the beamline ID01 of the ESRF. The best result was obtained from crystals of Ca(2+) ATPase [adenosin-5'-(beta,gamma-methylene) triphosphate complex] which diffracted out to 7 A resolution. Data were recorded at a wavelength at which the real resonant scattering factor of phosphorus reaches the extreme value of -20 electron units. The positions of the four triphosphates of the monoclinic unit cell of the ATPase have been obtained from a difference Fourier synthesis based on a limited set of anomalous diffraction data.
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Morth JP, Laursen M, Bublitz M, Moncoq K, Olesen C, Moeller JV, Young HS, Nissen P. The structure of the Ca 2+-ATPase bound to cyclopiazonic acid reveals a complexed divalent ion. Acta Crystallogr A 2009. [DOI: 10.1107/s0108767309096986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Laursen M, Bublitz M, Moncoq K, Olesen C, Møller JV, Young HS, Nissen P, Morth JP. Cyclopiazonic acid is complexed to a divalent metal ion when bound to the sarcoplasmic reticulum Ca2+-ATPase. J Biol Chem 2009; 284:13513-13518. [PMID: 19289472 DOI: 10.1074/jbc.c900031200] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have determined the structure of the sarco(endo)plasmic reticulum Ca(2+)-ATPase (SERCA) in an E2.P(i)-like form stabilized as a complex with MgF(4)(2-), an ATP analog, adenosine 5'-(beta,gamma-methylene)triphosphate (AMPPCP), and cyclopiazonic acid (CPA). The structure determined at 2.5A resolution leads to a significantly revised model of CPA binding when compared with earlier reports. It shows that a divalent metal ion is required for CPA binding through coordination of the tetramic acid moiety at a characteristic kink of the M1 helix found in all P-type ATPase structures, which is expected to be part of the cytoplasmic cation access pathway. Our model is consistent with the biochemical data on CPA function and provides new measures in structure-based drug design targeting Ca(2+)-ATPases, e.g. from pathogens. We also present an extended structural basis of ATP modulation pinpointing key residues at or near the ATP binding site. A structural comparison to the Na(+),K(+)-ATPase reveals that the Phe(93) side chain occupies the equivalent binding pocket of the CPA site in SERCA, suggesting an important role of this residue in stabilization of the potassium-occluded E2 state of Na(+),K(+)-ATPase.
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Affiliation(s)
- Mette Laursen
- Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark; Department of Molecular Biology, Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark
| | - Maike Bublitz
- Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark; Department of Molecular Biology, Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark
| | - Karine Moncoq
- Department of Biochemistry and National Institute for Nanotechnology, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - Claus Olesen
- Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark; Department of Physiology and Biophysics, Aarhus University, Ole Worms Allé, Bldg. 1160, DK-8000 Aarhus C, Denmark
| | - Jesper Vuust Møller
- Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark; Department of Physiology and Biophysics, Aarhus University, Ole Worms Allé, Bldg. 1160, DK-8000 Aarhus C, Denmark
| | - Howard S Young
- Department of Biochemistry and National Institute for Nanotechnology, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - Poul Nissen
- Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark; Department of Molecular Biology, Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark
| | - J Preben Morth
- Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark; Department of Molecular Biology, Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark.
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le Maire M, Arnou B, Olesen C, Georgin D, Ebel C, Møller JV. Gel chromatography and analytical ultracentrifugation to determine the extent of detergent binding and aggregation, and Stokes radius of membrane proteins using sarcoplasmic reticulum Ca2+-ATPase as an example. Nat Protoc 2009; 3:1782-95. [PMID: 18974737 DOI: 10.1038/nprot.2008.177] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
For structural studies of integral membrane proteins, including their 3D crystallization, the judicious use of detergent for solubilization and purification is required. Detergent binding by the solubilized protein is an important parameter to determine the hydrodynamic properties in terms of size and aggregational (monomeric/oligo(proto)meric) state of the protein. Detergent binding can be measured by gel filtration chromatography under equilibrium conditions and after separation from mixed micelles of solubilized lipid and detergent. Using sarcoplasmic reticulum Ca(2+)-ATPase as an example, we demonstrate in this protocol complete procedures for measurement of detergent binding using (i) radiolabeled n-dodecyl-beta-D-maltoside (DM) or (ii) from measurements of the increase in refractive index due to the presence of bound detergent on the protein. The latter measurement can also be performed by sedimentation velocity (SV) analysis in the analytical ultracentrifuge which in addition allows determination of the sedimentation coefficient. In combination with estimation of Stokes radius by gel filtration calibration, the molecular mass and asymmetry of the solubilized protein can be calculated. In the proposed protocols, the gel chromatographic procedures require 1 d; SV experiments are performed just after size exclusion. The whole time for these experiments is 24 h. Data analysis of analytical ultracentrifugation requires a couple of days.
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Affiliation(s)
- Marc le Maire
- CEA, Institut de Biologie et Technologies de Saclay, F-91191 Gif-sur-Yvette, France.
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Sørensen H, Nielsen GL, Andersen AM, Zhou WJ, Steffensen FH, Olesen C, Olsen J. Drug Use in Pregnancy. Principal Problems and a Review of Newer Utilization Studies. ACTA ACUST UNITED AC 2008. [DOI: 10.3109/10601339609035951] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Winther AM, Sonntag Y, Soehoel H, Olesen C, Denmeade S, Isaacs J, Christensen S, Moeller J, Nissen P. Crystal structures of SERCA in complex with inhibitors with potential as prostate cancer drugs. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308088909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Olesen C, Picard M, Winther AM, Nielsen C, Morth J, Oxvig C, Moller J, Nissen P. The structural basis of calcium transport by the calcium pump. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308088077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Marchand A, Winther AML, Holm PJ, Olesen C, Montigny C, Arnou B, Champeil P, Clausen JD, Vilsen B, Andersen JP, Nissen P, Jaxel C, Møller JV, le Maire M. Crystal structure of D351A and P312A mutant forms of the mammalian sarcoplasmic reticulum Ca(2+) -ATPase reveals key events in phosphorylation and Ca(2+) release. J Biol Chem 2008; 283:14867-82. [PMID: 18356161 DOI: 10.1074/jbc.m710165200] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In recent years crystal structures of the sarcoplasmic reticulum Ca(2+)-ATPase (SERCA1a), stabilized in various conformations with nucleotide and phosphate analogs, have been obtained. However, structural analysis of mutant forms would also be valuable to address key mechanistic aspects. We have worked out a procedure for affinity purification of SERCA1a heterologously expressed in yeast cells, producing sufficient amounts for crystallization and biophysical studies. We present here the crystal structures of two mutant forms, D351A and P312A, to address the issue whether the profound functional changes seen for these mutants are caused by major structural changes. We find that the structure of P312A with ADP and AlF(4)(-) bound (3.5-A resolution) and D351A with AMPPCP or ATP bound (3.4- and 3.7-A resolution, respectively) deviate only slightly from the complexes formed with that of wild-type ATPase. ATP affinity of the D351A mutant was very high, whereas the affinity for cytosolic Ca(2+) was similar to that of the wild type. We conclude from an analysis of data that the extraordinary affinity of the D351A mutant for ATP is caused by the electrostatic effects of charge removal and not by a conformational change. P312A exhibits a profound slowing of the Ca(2+)-translocating Ca(2)E1P-->E2P transition, which seems to be due to a stabilization of Ca(2)E1P rather than a destabilization of E2P. This can be accounted for by the strain that the Pro residue induces in the straight M4 helix of the wild type, which is removed upon the replacement of Pro(312) with alanine in P312A.
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Affiliation(s)
- Alexandre Marchand
- Commissariat à l'Energie Atomique (CEA), Institut de Biologie et de Technologies de Saclay, SBSM, URA CNRS 2096, Laboratoire de Recherche Associé, 17V University of Paris-Sud, Gif sur Yvette, France
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Olesen C, Nyeng P, Kalisz M, Jensen TH, Møller M, Tommerup N, Byskov AG. Global gene expression analysis in fetal mouse ovaries with and without meiosis and comparison of selected genes with meiosis in the testis. Cell Tissue Res 2006; 328:207-21. [PMID: 17431699 DOI: 10.1007/s00441-006-0205-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2006] [Accepted: 03/22/2006] [Indexed: 10/23/2022]
Abstract
In order to identify novel genes involved in early meiosis and early ovarian development in the mouse, we used microarray technology to compare transcriptional activity in ovaries without meiotic germ cells at embryonic age 11.5 (E11.5) and E13.5 ovaries with meiosis. Overall, 182 genes were differentially expressed; 134 were known genes and 48 were functionally uncharacterized. A comparison of our data with the literature associated, for the first time, at least eight of the known genes with female meiosis/germ cell differentiation (Aldh1a1, C2pa, Tex12, Stk31, Lig3, Id4, Recql, Piwil2). These genes had previously only been described in spermatogenesis. The microarray also detected an abundance of vesicle-related genes of which four were upregulated (Syngr2, Stxbp1, Ric-8, SytIX) and one (Myo1c) was downregulated in E13.5 ovaries. Detailed analysis showed that the temporal expression of SytIX also coincided with the first meiotic wave in the pubertal testis. This is the first time that SytIX has been reported in non-neuronal tissue. Finally, we examined the expression of one of the uncharacterized genes and found it to be gonad-specific in adulthood. We named this novel transcript "Gonad-expressed transcript 1" (Get-1). In situ hybridization showed that Get-1 was expressed in meiotic germ cells in both fetal ovaries and mature testis. Get-1 is therefore a novel gene in both male and female meiosis.
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Affiliation(s)
- C Olesen
- Laboratory of Reproductive Biology, Center for Children, Women and Reproduction, Copenhagen University Hospital, Copenhagen, Denmark.
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Møller JV, Olesen C, Jensen AML, Nissen P. The structural basis for coupling of Ca2+ transport to ATP hydrolysis by the sarcoplasmic reticulum Ca2+-ATPase. J Bioenerg Biomembr 2006; 37:359-64. [PMID: 16691465 DOI: 10.1007/s10863-005-9471-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Recently, a series of structure determinations has nearly completed a structural description of the transport cycle of the sarcoplasmic reticulum Ca(2+)-ATPase, especially those steps concerned with the phosphorylation by ATP and the dephosphorylation reaction. From these structures Ca(2+)-ATPase emerges as a molecular machine, where globular cytosolic domains and transmembrane helices work in concert like a mechanical pump, as can be vividly demonstrated in animated versions of the pump cycle. The structures show that both ATP phosphorylation and dephosphorylation at Asp351 take place as nucleophilic SN2 reactions, which are associated with Ca(2+) and H(+) occluded states, respectively. These transitory steps ensure efficient coupling between Ca(2+) transport and ATP hydrolysis.
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Affiliation(s)
- Jesper Vuust Møller
- Department of Biophysics, Institute of Physiology and Biophysics, University of Aarhus, DK-8000, Aarhus C, Denmark.
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Jensen AML, Sørensen TLM, Olesen C, Møller JV, Nissen P. Modulatory and catalytic modes of ATP binding by the calcium pump. EMBO J 2006; 25:2305-14. [PMID: 16710301 PMCID: PMC1478189 DOI: 10.1038/sj.emboj.7601135] [Citation(s) in RCA: 161] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Accepted: 04/19/2006] [Indexed: 01/07/2023] Open
Abstract
We present crystal structures of the calcium-free E2 state of the sarcoplasmic reticulum Ca2+ -ATPase, stabilized by the inhibitor thapsigargin and the ATP analog AMPPCP. The structures allow us to describe the ATP binding site in a modulatory mode uncoupled from the Asp351 phosphorylation site. The Glu439 side chain interacts with AMPPCP via an Mg2+ ion in accordance with previous Fe2+ -cleavage studies implicating this residue in the ATPase cycle and in magnesium binding. Functional data on Ca2+ mediated activation indicate that the crystallized state represents an initial stage of ATP modulated deprotonation of E2, preceding the binding of Ca2+ ions in the membrane from the cytoplasmic side. We propose a mechanism of Ca2+ activation of phosphorylation leading directly from the compact E2-ATP form to the Ca2E1-ATP state. In addition, a role of Glu439 in ATP modulation of other steps of the functional cycle is suggested.
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Affiliation(s)
| | | | - Claus Olesen
- Institute of Physiology and Biophysics, Aarhus University, Denmark
| | - Jesper Vuust Møller
- Institute of Physiology and Biophysics, Aarhus University, Denmark
- Institute of Physiology and Biophysics, Aarhus University, Denmark. Tel.: +45 8942 2938; Fax: +45 8612 9599; E-mail:
| | - Poul Nissen
- Department of Molecular Biology, Aarhus University, Denmark
- Department of Molecular Biology, Aarhus University, Gustav Wieds Vej 10c, Aarhus, 8000, Denmark. Tel.: +45 8942 5025; Fax: +45 8612 3178; E-mail:
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Sørensen TLM, Olesen C, Jensen AML, Møller JV, Nissen P. Crystals of sarcoplasmic reticulum Ca(2+)-ATPase. J Biotechnol 2006; 124:704-16. [PMID: 16597471 DOI: 10.1016/j.jbiotec.2006.02.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2005] [Accepted: 02/01/2006] [Indexed: 11/24/2022]
Abstract
High-resolution structures of the Ca(2+)-ATPase have over the last 5 years added a structural dimension to our understanding of the function of this integral membrane protein. The Ca(2+)-ATPase is now by far the membrane protein where the most functionally different conformations have been described in precise structural detail. Here, we review our experience from solving Ca(2+)-ATPase structures: a purification scheme involving minimum handling of the protein to preserve natural and essential lipids, a rational approach to screening for crystals based on a limited number of polyethyleneglycols and many different salts, improving crystal quality using additives, collecting the data and finally solving the structures. We argue that certain of the lessons learned in the present study are very likely to be useful for crystallisation of eukaryotic membrane proteins in general.
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Olesen C, Sørensen TL, Nielsen RC, Møller J, Nissen P. Dephosphorylation of the calcium pump coupled to counterion occlusion. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305099265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Kragelund C, Snorgaard O, Køber L, Bengtsson B, Ottesen M, Højberg S, Olesen C, Kjaergaard JJ, Carlsen J, Torp-Petersen C. Hyperinsulinaemia is associated with increased long-term mortality following acute myocardial infarction in non-diabetic patients. Eur Heart J 2005; 25:1891-7. [PMID: 15522467 DOI: 10.1016/j.ehj.2004.07.033] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2004] [Revised: 07/06/2004] [Accepted: 07/29/2004] [Indexed: 11/22/2022] Open
Abstract
AIMS To study the impact of disturbances in glucose metabolism on total mortality in non-diabetic patients with acute myocardial infarction. METHODS AND RESULTS Four hundred and ninety four patients with a verified myocardial infarction and no history of diabetes were studied. The study population comprised a subgroup of patients screened for participation in the Trandolapril Cardiac Evaluation (TRACE) study. At baseline, fasting insulin, fasting glucose, glycosylated haemoglobin (HbA1c), and urinary albumin excretion were measured. Survival status was determined after 6-8 years. Patients with hyperinsulinaemia were more obese and more frequently suffered from hypertension, previous myocardial infarction and congestive heart failure. In a univariate regression analysis, values in the upper quartile of insulin, glucose, HbA1c, and urinary albumin were associated with an excess mortality risk (RR=1.8 (1.2-2.7), p=0.002; RR=1.6 (1.2-2.1), p=0.001; RR= 1.9 (1.3-2.9), p=0.001; RR=1.6 (1.2-2.1), p=0.02 respectively). However, only a high insulin level remained significant in a multivariable analysis (RR=1.54 (1.03-2.31), p=0.04) including baseline variables, left ventricular systolic function and in-hospital complications. CONCLUSIONS High fasting plasma insulin is an independent risk factor of all-cause mortality in non-diabetic patients with acute myocardial infarction. This justifies future intervention studies aiming at reducing insulin resistance and using fasting insulin as the target variable.
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Affiliation(s)
- Charlotte Kragelund
- Department of Cardiology and Endocrinology, Frederiksberg Hospital, University of Copenhagen, Nordre Fasanvej 57-59, DK-2000 Frederiksberg, Denmark.
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