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Golub M, Gätcke J, Subramanian S, Kölsch A, Darwish T, Howard JK, Feoktystov A, Matsarskaia O, Martel A, Porcar L, Zouni A, Pieper J. "Invisible" Detergents Enable a Reliable Determination of Solution Structures of Native Photosystems by Small-Angle Neutron Scattering. J Phys Chem B 2022; 126:2824-2833. [PMID: 35384657 DOI: 10.1021/acs.jpcb.2c01591] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photosystems I (PSI) and II (PSII) are pigment-protein complexes capable of performing the light-induced charge separation necessary to convert solar energy into a biochemically storable form, an essential step in photosynthesis. Small-angle neutron scattering (SANS) is unique in providing structural information on PSI and PSII in solution under nearly physiological conditions without the need for crystallization or temperature decrease. We show that the reliability of the solution structure critically depends on proper contrast matching of the detergent belt surrounding the protein. Especially, specifically deuterated ("invisible") detergents are shown to be properly matched out in SANS experiments by a direct, quantitative comparison with conventional matching strategies. In contrast, protonated detergents necessarily exhibit incomplete matching so that related SANS results systematically overestimate the size of the membrane protein under study. While the solution structures obtained are close to corresponding high-resolution structures, we show that temperature and solution state lead to individual structural differences compared with high-resolution structures. We attribute these differences to the presence of a manifold of conformational substates accessible by protein dynamics under physiological conditions.
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Affiliation(s)
- M Golub
- Institute of Physics, University of Tartu, Wilhelm Ostwald str. 1, 50411 Tartu, Estonia
| | - J Gätcke
- Humboldt-Universität zu Berlin, Philippstr. 13, 10115 Berlin, Germany
| | - S Subramanian
- Humboldt-Universität zu Berlin, Philippstr. 13, 10115 Berlin, Germany
| | - A Kölsch
- Humboldt-Universität zu Berlin, Philippstr. 13, 10115 Berlin, Germany
| | - T Darwish
- National Deuteration Facility, Australian Nuclear Science and Technology Organization, New Illawarra Road, Lucas Heights, NSW 2234, Australia
| | - J K Howard
- National Deuteration Facility, Australian Nuclear Science and Technology Organization, New Illawarra Road, Lucas Heights, NSW 2234, Australia
| | - A Feoktystov
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergstr. 1, 85748 Garching, Germany
| | - O Matsarskaia
- Institut Laue-Langevin, 71 Avenue des Martyrs CS 20156, 38042 Grenoble Cedex 9, France
| | - A Martel
- Institut Laue-Langevin, 71 Avenue des Martyrs CS 20156, 38042 Grenoble Cedex 9, France
| | - L Porcar
- Institut Laue-Langevin, 71 Avenue des Martyrs CS 20156, 38042 Grenoble Cedex 9, France
| | - A Zouni
- Humboldt-Universität zu Berlin, Philippstr. 13, 10115 Berlin, Germany
| | - J Pieper
- Institute of Physics, University of Tartu, Wilhelm Ostwald str. 1, 50411 Tartu, Estonia
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Ballikaya S, Sadeghi S, Niebergall-Roth E, Nimtz L, Frindert J, Norrick A, Stemler N, Bauer N, Rosche Y, Kratzenberg V, Pieper J, Ficek T, Frank MH, Ganss C, Esterlechner J, Kluth MA. Process data of allogeneic ex vivo-expanded ABCB5 + mesenchymal stromal cells for human use: off-the-shelf GMP-manufactured donor-independent ATMP. Stem Cell Res Ther 2020; 11:482. [PMID: 33198791 PMCID: PMC7667860 DOI: 10.1186/s13287-020-01987-y] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 10/20/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Human dermal mesenchymal stromal cells (MSCs) expressing the ATP-binding cassette (ABC) efflux transporter ABCB5 represent an easily accessible MSC population that, based on preclinical and first-in-human data, holds significant promise to treat a broad spectrum of conditions associated not only with skin-related but also systemic inflammatory and/or degenerative processes. METHODS We have developed a validated Good Manufacturing Practice-compliant expansion and manufacturing process by which ABCB5+ MSCs derived from surgical discard skin tissues are processed to an advanced-therapy medicinal product (ATMP) for clinical use. Enrichment for ABCB5+ MSCs is achieved in a three-step process involving plastic adherence selection, expansion in a highly efficient MSC-selecting medium, and immunomagnetic isolation of the ABCB5+ cells from the mixed culture. RESULTS Product Quality Review data covering 324 cell expansions, 728 ABCB5+ MSC isolations, 66 ABCB5+ MSC batches, and 85 final drug products reveal high process robustness and reproducible, reliable quality of the manufactured cell therapy product. CONCLUSION We have successfully established an expansion and manufacturing process that enables the generation of homogenous ABCB5+ MSC populations of proven biological activity manufactured as a standardized, donor-independent, highly pure, and highly functional off-the-shelf available ATMP, which is currently tested in multiple clinical trials.
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Affiliation(s)
- Seda Ballikaya
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | - Samar Sadeghi
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | | | - Laura Nimtz
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | - Jens Frindert
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | | | - Nicole Stemler
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | - Nicole Bauer
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | - Yvonne Rosche
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | | | - Julia Pieper
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | - Tina Ficek
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | - Markus H. Frank
- Transplant Research Program, Boston Children’s Hospital, Harvard Medical School, Boston, MA USA ,grid.38142.3c000000041936754XHarvard Stem Cell Institute, Harvard University, Cambridge, MA USA ,Department of Dermatology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA USA ,grid.1038.a0000 0004 0389 4302School of Medical and Health Sciences, Edith Cowan University, Perth, Western Australia Australia
| | - Christoph Ganss
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany ,grid.476673.7RHEACELL GmbH & Co. KG, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
| | | | - Mark A. Kluth
- TICEBA GmbH, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany ,grid.476673.7RHEACELL GmbH & Co. KG, Im Neuenheimer Feld 517, 69120 Heidelberg, Germany
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Kölsch A, Radon C, Golub M, Baumert A, Bürger J, Mielke T, Lisdat F, Feoktystov A, Pieper J, Zouni A, Wendler P. Current limits of structural biology: The transient interaction between cytochrome c 6 and photosystem I. Curr Res Struct Biol 2020; 2:171-179. [PMID: 34235477 PMCID: PMC8244401 DOI: 10.1016/j.crstbi.2020.08.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 08/11/2020] [Accepted: 08/17/2020] [Indexed: 12/22/2022] Open
Abstract
Trimeric photosystem I from the cyanobacterium Thermosynechococcus elongatus (TePSI) is an intrinsic membrane protein, which converts solar energy into electrical energy by oxidizing the soluble redox mediator cytochrome c 6 (Cyt c 6 ) and reducing ferredoxin. Here, we use cryo-electron microscopy and small angle neutron scattering (SANS) to characterize the transient binding of Cyt c 6 to TePSI. The structure of TePSI cross-linked to Cyt c 6 was solved at a resolution of 2.9 Å and shows additional cofactors as well as side chain density for 84% of the peptide chain of subunit PsaK, revealing a hydrophobic, membrane intrinsic loop that enables binding of associated proteins. Due to the poor binding specificity, Cyt c 6 could not be localized with certainty in our cryo-EM analysis. SANS measurements confirm that Cyt c 6 does not bind to TePSI at protein concentrations comparable to those for cross-linking. However, SANS data indicate a complex formation between TePSI and the non-native mitochondrial cytochrome from horse heart (Cyt c HH ). Our study pinpoints the difficulty of identifying very small binding partners (less than 5% of the overall size) in EM structures when binding affinities are poor. We relate our results to well resolved co-structures with known binding affinities and recommend confirmatory methods for complexes with K M values higher than 20 μM.
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Affiliation(s)
- A. Kölsch
- Department of Biology, Humboldt–Universität zu Berlin, Philippstrasse 13, 10115, Berlin, Germany
| | - C. Radon
- Institute of Biochemistry and Biology, Department of Biochemistry, University of Potsdam, Karl-Liebknecht Strasse 24-25, 14476, Potsdam-Golm, Germany
| | - M. Golub
- Institute of Physics, University of Tartu, Wilhelm Ostwaldi 1, 50411, Tartu, Estonia
| | - A. Baumert
- Institute of Biochemistry and Biology, Department of Biochemistry, University of Potsdam, Karl-Liebknecht Strasse 24-25, 14476, Potsdam-Golm, Germany
| | - J. Bürger
- Max-Planck Institute for Molecular Genetics, Ihnestrasse 63-73, 14195, Berlin, Germany
- Charité, Institut für Medizinische Physik und Biophysik, Charitéplatz 1, 10117, Berlin, Germany
| | - T. Mielke
- Max-Planck Institute for Molecular Genetics, Ihnestrasse 63-73, 14195, Berlin, Germany
| | - F. Lisdat
- Institute of Applied Life Sciences, Technical University of Applied Sciences Wildau, Hochschulring 1, 15745, Wildau, Germany
| | - A. Feoktystov
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergstr. 1, 85748, Garching, Germany
| | - J. Pieper
- Institute of Physics, University of Tartu, Wilhelm Ostwaldi 1, 50411, Tartu, Estonia
| | - A. Zouni
- Department of Biology, Humboldt–Universität zu Berlin, Philippstrasse 13, 10115, Berlin, Germany
| | - P. Wendler
- Institute of Biochemistry and Biology, Department of Biochemistry, University of Potsdam, Karl-Liebknecht Strasse 24-25, 14476, Potsdam-Golm, Germany
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Pieper J, Hoedemaker M, Krömker V. Zur Bedeutung der Trockenperiode für die Entstehung und Vorbeugung von Neuinfektionen der bovinen Milchdrüse. Tierarztl Prax Ausg G Grosstiere Nutztiere 2018. [DOI: 10.1055/s-0038-1623186] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
ZusammenfassungDie Trockenperiode birgt eine außerordentlich hohe Neuinfektionsgefahr für die bovine Milchdrüse, insbesondere durch umweltassoziierte Mastitiserreger. In der Regel ruft eine Infektion während der Trockenperiode keine klinischen Symptome hervor, führt aber oft nach dem Kalben, in den ersten Wochen der Laktation, zu einer klinischen Mastitis. Eine Reduzierung der Neuinfektionen trockenstehender Kühe kann die Mastitisinzidenz während der Frühlaktation deutlich verringern. Im Verlauf der Trockenperiode bleibt die Neuinfektionsrate nicht konstant, sondern ist unmittelbar nach dem Trockenstellen sowie kurz vor dem Kalben besonders hoch. Die Wahrscheinlichkeit einer Neuinfektion wird multifaktoriell durch Tier-, Erreger- und Umwelteinflüsse bestimmt. Eine wesentliche Rolle spielt hierbei der Verschluss des Zitzenkanals durch einen Keratinpfropf. Im Rahmen des antibiotischen Trockenstellens gibt es unterschiedliche Vorgehensweisen. Es können alle Euterviertel aller trockenzustellenden Kühe antibiotisch behandelt werden (generelles antibiotisches Trockenstellen, GAT) oder nur die Euterviertel der Kühe, in deren Milch Mastitiserreger oder erhöhte Zellgehalte nachgewiesen wurden (selektives antibiotisches Trockenstellen, SAT). Bei letzterer Variante muss weiterhin unterschieden werden, ob sich die Behandlung auf alle oder nur das von einer Infektion oder einem erhöhten Zellgehalt betroffene Euterviertel erstreckt. Anstelle des Einsatzes antibiotischer Wirkstoffe oder als Ergänzung dazu eignen sich Zitzenversiegler, die den Zitzenkanal nach außen hin abdichten und so die Funktion des Keratinpfropfes ergänzen oder übernehmen. Des Weiteren existieren einige alternative Vorgehensweisen zur Vermeidung von Neuinfektionen. Von übergeordneter Bedeutung ist allerdings die Minderung des Infektionsdrucks. Hierfür bestehen zahlreiche Möglichkeiten zur Verbesserung der Hygiene im Haltungsumfeld der Trockensteher.
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Felsmann D, Lucassen A, Krüger J, Hemken C, Tran LS, Pieper J, Garcia GA, Brockhinke A, Nahon L, Kohse-Höinghaus K. Progress in Fixed-Photon-Energy Time-Efficient Double Imaging Photoelectron/Photoion Coincidence Measurements in Quantitative Flame Analysis. Z PHYS CHEM 2016. [DOI: 10.1515/zpch-2016-0760] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Photoelectron photoion coincidence (PEPICO) spectroscopy as an attractive new technique for
combustion analysis was used in a fixed-photon-energy configuration to provide quantitative
species profiles in laminar premixed flames. While such measurements are conventionally
performed with molecular-beam mass spectrometry (MBMS) using electron ionization (EI) or
vacuum ultraviolet (VUV) photoionization (PI) with synchrotron radiation, these techniques
have some limitations. The possibility to record photoelectron spectra (PES) simultaneously
with photoionization data, providing fingerprint information for reliable species
identification, presents a significant advantage of PEPICO spectroscopy especially in
complex reactive mixtures. The multiplex approach presented here, enhanced by the imaging
capabilities of the electron and ion detection in the so-called double-imaging PEPICO scheme
(i2PEPICO), provides, in different experimental situations, an
unprecedentedly detailed combustion analysis regarding both species identification and
quantification. Problems and perspectives of the present fixed-photon-energy PEPICO approach
will be discussed.
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Affiliation(s)
- Daniel Felsmann
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Arnas Lucassen
- Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
| | - Julia Krüger
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192 Gif-sur-Yvette, France
| | - Christian Hemken
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Luc-Sy Tran
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Julia Pieper
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192 Gif-sur-Yvette, France
| | - Andreas Brockhinke
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192 Gif-sur-Yvette, France
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Pieper J, Johansson S, Snir O, Linton L, Rieck M, Buckner JH, Winqvist O, van Vollenhoven R, Malmström V. Peripheral and site-specific CD4(+) CD28(null) T cells from rheumatoid arthritis patients show distinct characteristics. Scand J Immunol 2014; 79:149-55. [PMID: 24313359 DOI: 10.1111/sji.12139] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 11/19/2013] [Indexed: 12/28/2022]
Abstract
Proinflammatory CD4(+) CD28(null) T cells are frequently found in the circulation of patients with rheumatoid arthritis (RA), but are less common in the rheumatic joint. In the present study, we sought to identify functional differences between CD4(+) CD28(null) T cells from blood and synovial fluid in comparison with conventional CD28-expressing CD4(+) T cells. Forty-four patients with RA, displaying a distinct CD4(+) CD28(null) T cell population in blood, were recruited for this study; the methylation status of the IFNG locus was examined in isolated T cell subsets, and intracellular cytokine production (IFN-γ, TNF, IL-17) and chemokine receptor expression (CXCR3, CCR6 and CCR7) were assessed by flow cytometry on T cells from the two compartments. Circulating CD4(+) CD28(null) T cells were significantly more hypomethylated in the CNS-1 region of the IFNG locus than conventional CD4(+) CD28(+) T cells and produced higher levels of both IFN-γ and TNF after TCR cross-linking. CD4(+) CD28(null) T cells from the site of inflammation expressed significantly more CXCR3 and CCR6 compared to their counterparts in blood. While IL-17A production could hardly be detected in CD4(+) CD28(null) cells from the blood, a significant production was observed in CD4(+) CD28(null) T cells from synovial fluid. CD4(+) CD28(null) T cells were not only found to differ from conventional CD4(+) CD28(+) T cells in the circulation, but we could also demonstrate that synovial CD4(+) CD28(null) T cells showed additional effector functions (IL-17 coproduction) as compared to the same subset in peripheral blood, suggesting an active role for these cells in the perpetuation of inflammation in the subset of patients having a CD28(null) population.
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Affiliation(s)
- J Pieper
- Rheumatology Unit, Department of Medicine at Karolinska University Hospital, Karolinska Institute, Solna, Stockholm, Sweden
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Pieper J, Hoedemaker M, Krömker V. [Significance of the dry period for the development and prevention of new infections of the bovine mammary gland]. Tierarztl Prax Ausg G Grosstiere Nutztiere 2013; 41:315-325. [PMID: 24127000] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2012] [Accepted: 05/15/2013] [Indexed: 06/02/2023]
Abstract
The dry period poses an extraordinarily high risk of new infections for the bovine mammary gland. Environmental pathogens are of particular importance during this time. Normally, an infection during the dry period does not cause clinical symptoms, but is often responsible for clinical mastitis in the first weeks of lactation. Reducing new infections in dry cows can significantly decrease mastitis incidence in early lactation. During the course of the dry period, the new infection rate does not remain constant, but peaks immediately after drying off and shortly before calving. The chance of a new infection is influenced multifactorially by the animal, pathogen and environment. In this context, the closure of the teat canal using a keratin plug is very important. There are different approaches to antibiotic dry cow treatment. Either all udder quarters of all dry cows are treated (blanket dry-cow treatment) or just the udder of animals with a proven infection or an increased somatic cell count (selective dry-cow treatment). In the latter case, all udder quarters of an animal may be treated or just the one in which the infection or the increased somatic cell count was found. Instead of, or as a supplement to antibiotic treatment, teat sealers can be used. They support or take over the function of the keratin plug by closing the teat canal. In addition, there are some alternative methods to prevent new infections. Nevertheless, reducing the risk of infection is of primary importance. For this purpose, there are numerous options for improving hygiene in the environment of dry cows.
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Affiliation(s)
- J Pieper
- Prof. Dr. Volker Krömker, Mikrobiologie der Fakultät II Maschinenbau und Bioverfahrenstechnik, Hochschule Hannover, Heisterbergallee 12, 30453 Hannover, E-Mail:
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Renger G, Pieper J, Theiss C, Trostmann I, Paulsen H, Renger T, Eichler HJ, Schmitt FJ. Water soluble chlorophyll binding protein of higher plants: a most suitable model system for basic analyses of pigment-pigment and pigment-protein interactions in chlorophyll protein complexes. J Plant Physiol 2011; 168:1462-1472. [PMID: 21256622 DOI: 10.1016/j.jplph.2010.12.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 12/08/2010] [Accepted: 12/08/2010] [Indexed: 05/30/2023]
Abstract
This short review paper describes spectroscopic studies on pigment-pigment and pigment-protein interactions of chlorophyll (Chl) a and b bound to the recombinant protein of class IIa water soluble chlorophyll protein (WSCP) from cauliflower. Two Chls form a strongly excitonically coupled open sandwich dimer within the tetrameric protein matrix. In marked contrast to the mode of excitonic coupling of Chl and bacterio-Chl molecules in light harvesting complexes and reaction centers of all photosynthetic organisms, the unique structural pigment array in the Chl dimer of WSCP gives rise to an upper excitonic state with a large oscillator strength. This property opens the way for thorough investigations on exciton relaxation processes in Chl-protein complexes. Lifetime measurements of excited singlet states show that the unusual stability towards photodamage of Chls bound to WSCP, which lack any protective carotenoid molecule, originates from a high diffusion barrier to interaction of molecular dioxygen with Chl triplets. Site selective spectroscopic methods provide a wealth of information on the interactions of the Chls with the protein matrix and on the vibronic structure of the pigments. The presented data and discussions illustrate the great potential of WSCP as a model system for systematic experimental and theoretical studies on the functionalizing of Chls by the protein matrix. It opens the way for further detailed analyses and a deeper understanding of the properties of pigment protein complexes.
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Affiliation(s)
- G Renger
- Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany.
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Pieper J, Rätsep M, Trostmann I, Paulsen H, Renger G, Freiberg A. Excitonic Energy Level Structure and Pigment−Protein Interactions in the Recombinant Water-Soluble Chlorophyll Protein. I. Difference Fluorescence Line-Narrowing. J Phys Chem B 2011; 115:4042-52. [DOI: 10.1021/jp111455g] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Pieper
- Max-Volmer-Laboratories for
Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany
| | - M. Rätsep
- Institute of Physics, University of Tartu, Tartu, Estonia
| | - I. Trostmann
- Institute of General Botany, Johannes Gutenberg University Mainz, Germany
| | - H. Paulsen
- Institute of General Botany, Johannes Gutenberg University Mainz, Germany
| | - G. Renger
- Max-Volmer-Laboratories for
Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany
| | - A. Freiberg
- Institute of Physics, University of Tartu, Tartu, Estonia
- Institute of Molecular and Cell
Biology, University of Tartu, Tartu, Estonia
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Pieper J, Rätsep M, Trostmann I, Schmitt FJ, Theiss C, Paulsen H, Eichler H, Freiberg A, Renger G. Excitonic Energy Level Structure and Pigment−Protein Interactions in the Recombinant Water-Soluble Chlorophyll Protein. II. Spectral Hole-Burning Experiments. J Phys Chem B 2011; 115:4053-65. [DOI: 10.1021/jp111457t] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Pieper
- Max-Volmer-Laboratories for
Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany
| | - M. Rätsep
- Institute of Physics, University of Tartu, Tartu, Estonia
| | - I. Trostmann
- Institute of General Botany, Johannes Gutenberg University Mainz, Germany
| | - F.-J. Schmitt
- Max-Volmer-Laboratories for
Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany
- Institute of Optics and Atomic
Physics, Berlin Institute of Technology, Germany
| | - C. Theiss
- Institute of Optics and Atomic
Physics, Berlin Institute of Technology, Germany
| | - H. Paulsen
- Institute of General Botany, Johannes Gutenberg University Mainz, Germany
| | - H.J. Eichler
- Institute of Optics and Atomic
Physics, Berlin Institute of Technology, Germany
| | - A. Freiberg
- Institute of Physics, University of Tartu, Tartu, Estonia
- Institute of Molecular and Cell
Biology, University of Tartu, Tartu, Estonia
| | - G. Renger
- Max-Volmer-Laboratories for
Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany
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Pieper J, Snir O, Johansson S, Janson P, Winqvist O, Malmstrom V. CD4+CD28null T cells in RA show distinctive proinflammatory features and IFN- promoter demethylation. Ann Rheum Dis 2011. [DOI: 10.1136/ard.2010.148981.11] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Pieper J, Lengl-Janßen B, Voss M, Gelhaus C, Leippe M, Janssen O, Lettau M. Identification of interaction partners of the adapter protein Nck in T cells. Cell Commun Signal 2009. [PMCID: PMC4291849 DOI: 10.1186/1478-811x-7-s1-a84] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Teixeira SCM, Ankner J, Bellissent-Funel MC, Bewley R, Blakeley MP, Coates L, Dahint R, Dalgliesh R, Dencher N, Dhont J, Fischer P, Forsyth VT, Fragneto G, Frick B, Geue T, Gilles R, Gutberlet T, Haertlein M, Hauß T, Häußler W, Heller WT, Herwig K, Holderer O, Juranyi F, Kampmann R, Knott R, Kohlbrecher J, Kreuger S, Langan P, Lechner R, Lynn G, Majkrzak C, May R, Meilleur F, Mo Y, Mortensen K, Myles DAA, Natali F, Neylon C, Niimura N, Ollivier J, Ostermann A, Peters J, Pieper J, Rühm A, Schwahn D, Shibata K, Soper AK, Straessle T, Suzuki UI, Tanaka I, Tehei M, Timmins P, Torikai N, Unruh T, Urban V, Vavrin R, Weiss K, Zaccai G. New sources and instrumentation for neutrons in biology. Chem Phys 2009; 345:133-151. [PMID: 19132140 PMCID: PMC2614686 DOI: 10.1016/j.chemphys.2008.02.030] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Neutron radiation offers significant advantages for the study of biological molecular structure and dynamics. A broad and significant effort towards instrumental and methodological development to facilitate biology experiments at neutron sources worldwide is reviewed.
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Affiliation(s)
- S C M Teixeira
- Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble cedex 9, France
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14
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Schmitt FJ, Trostmann I, Theiss C, Pieper J, Renger T, Fuesers J, Hubrich EH, Paulsen H, Eichler HJ, Renger G. Excited State Dynamics in Recombinant Water-Soluble Chlorophyll Proteins (WSCP) from Cauliflower Investigated by Transient Fluorescence Spectroscopy. J Phys Chem B 2008; 112:13951-61. [DOI: 10.1021/jp8024057] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- F.-J. Schmitt
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - I. Trostmann
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - C. Theiss
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - J. Pieper
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - T. Renger
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - J. Fuesers
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - E. H. Hubrich
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - H. Paulsen
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - H. J. Eichler
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
| | - G. Renger
- Institute of Optics and Atomic Physics, Berlin Institute of Technology, Berlin, Germany, Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany, Institute of General Botany, Johannes Gutenberg University Mainz, Mainz, Germany, Institute for Chemistry and Biochemistry, Free University Berlin, Berlin, Germany
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Teixeira S, Zaccai G, Ankner J, Bellissent-Funel M, Bewley R, Blakeley M, Callow P, Coates L, Dahint R, Dalgliesh R, Dencher N, Forsyth V, Fragneto G, Frick B, Gilles R, Gutberlet T, Haertlein M, Hauß T, Häußler W, Heller W, Herwig K, Holderer O, Juranyi F, Kampmann R, Knott R, Krueger S, Langan P, Lechner R, Lynn G, Majkrzak C, May R, Meilleur F, Mo Y, Mortensen K, Myles D, Natali F, Neylon C, Niimura N, Ollivier J, Ostermann A, Peters J, Pieper J, Rühm A, Schwahn D, Shibata K, Soper A, Strässle T, Suzuki J, Tanaka I, Tehei M, Timmins P, Torikai N, Unruh T, Urban V, Vavrin R, Weiss K. Erratum to “New sources and instrumentation for neutrons in biology” [Chem. Phys. 345 (2008) 133–151]. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.04.007] [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: 10/22/2022]
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Lamme EN, Druecke D, Pieper J, May PS, Kaim P, Jacobsen F, Steinau HU, Steinstraesser L. Long-term Evaluation of Porous PEGT/PBT Implants for Soft Tissue Augmentation. J Biomater Appl 2007. [DOI: 10.1177/0885328206075552] [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: 11/17/2022]
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Tripadus V, Radulescu A, Pieper J, Buchsteiner A, Podlesnyak A, Janssen S, Serban A. Molecular dynamics in triglycine sulphate by cold neutron spectroscopy. Chem Phys 2006. [DOI: 10.1016/j.chemphys.2005.08.042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Pieper J, Irrgang KD, Renger G, Lechner RE. Density of Vibrational States of the Light-Harvesting Complex II of Green Plants Studied by Inelastic Neutron Scattering. J Phys Chem B 2004. [DOI: 10.1021/jp049341f] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Pieper
- Hahn-Meitner-Institut Berlin, Glienicker Str. 100, 14109 Berlin, Germany, and Max-Volmer-Laboratories for Biophysical Chemistry, Technical University, Strasse des 17. Juni 135, 10623 Berlin, Germany
| | - K.-D. Irrgang
- Hahn-Meitner-Institut Berlin, Glienicker Str. 100, 14109 Berlin, Germany, and Max-Volmer-Laboratories for Biophysical Chemistry, Technical University, Strasse des 17. Juni 135, 10623 Berlin, Germany
| | - G. Renger
- Hahn-Meitner-Institut Berlin, Glienicker Str. 100, 14109 Berlin, Germany, and Max-Volmer-Laboratories for Biophysical Chemistry, Technical University, Strasse des 17. Juni 135, 10623 Berlin, Germany
| | - R. E. Lechner
- Hahn-Meitner-Institut Berlin, Glienicker Str. 100, 14109 Berlin, Germany, and Max-Volmer-Laboratories for Biophysical Chemistry, Technical University, Strasse des 17. Juni 135, 10623 Berlin, Germany
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Arialdi G, Karatasos K, Ryckaert JP, Arrighi V, Saggio F, Triolo A, Desmedt A, Pieper J, Lechner RE. Local Dynamics of Polyethylene and Its Oligomers: A Molecular Dynamics Interpretation of the Incoherent Dynamic Structure Factor. Macromolecules 2003. [DOI: 10.1021/ma0256789] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Paciaroni A, Orecchini A, Cinelli S, Onori G, Lechner R, Pieper J. Protein dynamics on the picosecond timescale as affected by the environment: a quasielastic neutron scattering study. Chem Phys 2003. [DOI: 10.1016/s0301-0104(03)00102-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pieper J, Buma P, van Kuppevelt TH, van Beuningen H, van Der Kraan PM, Veerkamp JH, van den Berg WB. Linkage of chondroitin-sulfate to type I collagen scaffolds stimulates the bioactivity of seeded chondrocytes in vitro. Biomaterials 2001; 22:2359-69. [PMID: 11511033 DOI: 10.1016/s0142-9612(00)00423-3] [Citation(s) in RCA: 153] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
An increasing amount of interest is focused on the potential use of tissue-engineered articular cartilage implants, for repair of defects in the joint surface. In this perspective, various biodegradable scaffolds have been evaluated as a vehicle to deliver chondrocytes into a cartilage defect. This cell-matrix implant should eventually promote regeneration of the traumatized articular joint surface with hyaline cartilage. Successful regeneration can only be achieved with such a tissue-engineered cartilage implant if the seeded cells reveal an appropriate proliferation rate in the biodegradable scaffold together with the production of a new cartilage-specific extracellular matrix. These metabolic parameters can be influenced by the biochemical composition of a cell-delivery scaffold. Further elucidation of specific cell-matrix interactions is important to define the optimal biochemical composition of a cell-delivery vehicle for cartilage repair. In this in vitro study, we investigated the effect of the presence of cartilage-specific glycosaminoglycans in a type I collagen scaffold on the metabolic activity of seeded chondrocytes. Isolated bovine chondrocytes were cultured in porous type I collagen matrices in the presence and absence of covalently attached chondroitin sulfate (CS) up to 14 days. CS did indeed influence the bioactivity of the seeded chondrocytes. Cell proliferation and the total amount of proteoglycans retained in the matrix, were significantly higher (p < 0.001) in type I collagen scaffolds with CS. Light microscopy showed the formation of a more dense cartilaginous layer at the matrix periphery. Scanning electron microscopy revealed an almost complete surfacing of the initially porous surface of both matrices. Histology and reverse transcriptase PCR for various proteoglycan subtypes suggested a good preservation of the chondrocytic phenotype of the seeded cells during culture. The stimulatory potential of CS on both the cell-proliferation and matrix retention, turns this GAG into an interesting biochemical component of a cell-delivery scaffold for use in tissue-engineering articular cartilage.
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Sora I, Elmer G, Funada M, Pieper J, Li XF, Hall FS, Uhl GR. Mu opiate receptor gene dose effects on different morphine actions: evidence for differential in vivo mu receptor reserve. Neuropsychopharmacology 2001; 25:41-54. [PMID: 11377918 DOI: 10.1016/s0893-133x(00)00252-9] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Homozygous transgenic knockout mice without mu-opioid receptors lack morphine-induced antinociception, locomotion, tolerance, physical dependence, and reward. mu receptors thus appear to play central roles in these morphine actions. Different levels of mu receptor expression are found in different humans and in different animal strains. In vitro studies indicate that some morphine responses persist after inactivation of as many as 90% of the initial mu receptor complement, while others are attenuated after inactivating many fewer receptors. Varying levels of mu receptor reserve could thus exist in different mu-expressing neuronal populations in vivo. Heterozygous mu receptor knockout mice express half of wild-type mu receptor levels. Tests of morphine actions in these mice reveal evidence for differing mu receptor reserves in brain circuits that mediate distinct opiate effects. Heterozygotes display attenuated locomotion, reduced morphine self-administration, intact tolerance, rightward shifts in morphine lethality dose/effect relationships, and variable effects on place preference compared to wild-type mice. They demonstrate full physical dependence, as measured by naloxone-precipitated abstinence following five days of morphine administration. Neuroadaptive changes in sites other than mu receptors could be involved in some of these results. Nevertheless, these data document substantial influences that individual differences in levels of mu receptor expression could exert on distinct opiate drug effects. They support the idea that functional mu receptor reserve differs among the diverse neuronal populations that mediate distinct properties of opiate drugs.
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MESH Headings
- Animals
- Behavior, Animal/drug effects
- Behavior, Animal/physiology
- Brain/drug effects
- Brain/metabolism
- Brain Chemistry/drug effects
- Brain Chemistry/genetics
- Conditioning, Psychological/drug effects
- Conditioning, Psychological/physiology
- Dose-Response Relationship, Drug
- Female
- Lethal Dose 50
- Male
- Mice
- Mice, Knockout/genetics
- Mice, Knockout/metabolism
- Morphine/pharmacology
- Morphine Dependence/physiopathology
- Motor Activity/drug effects
- Motor Activity/physiology
- Naloxone/pharmacology
- Narcotic Antagonists/pharmacology
- Narcotics/pharmacology
- Neurons/drug effects
- Neurons/metabolism
- Nociceptors/drug effects
- Nociceptors/metabolism
- Pain Measurement/drug effects
- Receptors, Opioid, mu/deficiency
- Receptors, Opioid, mu/drug effects
- Receptors, Opioid, mu/genetics
- Reward
- Self Administration
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Affiliation(s)
- I Sora
- Molecular Neurobiology Branch, NIDA-IRP, NIH, Baltimore, MD, USA
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Pieper J, Schödel R, Irrgang KD, Voigt J, Renger G. Electron−Phonon Coupling in Solubilized LHC II Complexes of Green Plants Investigated by Line-Narrowing and Temperature-Dependent Fluorescence Spectroscopy. J Phys Chem B 2001. [DOI: 10.1021/jp010229g] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Pieper
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, and Max-Volmer-Institute for Biophysical Chemistry and Biochemistry, Technical University, 10623 Berlin, Germany
| | - R. Schödel
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, and Max-Volmer-Institute for Biophysical Chemistry and Biochemistry, Technical University, 10623 Berlin, Germany
| | - K.-D. Irrgang
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, and Max-Volmer-Institute for Biophysical Chemistry and Biochemistry, Technical University, 10623 Berlin, Germany
| | - J. Voigt
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, and Max-Volmer-Institute for Biophysical Chemistry and Biochemistry, Technical University, 10623 Berlin, Germany
| | - G. Renger
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, and Max-Volmer-Institute for Biophysical Chemistry and Biochemistry, Technical University, 10623 Berlin, Germany
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25
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Pieper J, Irrgang KD, Rätsep M, Voigt J, Renger G, Small GJ. Assignment of the lowest Qy-state and spectral dynamics of the CP29 chlorophyll a/b antenna complex of green plants: a hole-burning study. Photochem Photobiol 2000; 71:574-81. [PMID: 10818788 DOI: 10.1562/0031-8655(2000)071<0574:aotlqy>2.0.co;2] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Low-temperature absorption, fluorescence and persistent non-photochemical hole-burned spectra are reported for the CP29 chlorophyll (Chl) a/b antenna complex of photosystem II of green plants. The absorption-origin band of the lowest Qy-state lies at 678.2 nm and carries a width of approximately 130 cm-1 that is dominated by inhomogeneous broadening at low temperatures. Its absorption intensity is equivalent to that of one of the six Chl a molecules of CP29. The absence of a significant satellite hole structure produced by hole burning, within the absorption band of the lowest state, indicates that the associated Chl a molecule is weakly coupled to the other Chl and, therefore, that the lowest-energy state is highly localized on a single Chl a molecule. The electron-phonon coupling of the 678.2 nm state is weak with a Huang-Rhys factor S of 0.5 and a peak phonon frequency (omega m) of approximately 20 cm-1. These values give a Stokes shift (2S omega m) in good agreement with the measured positions of the absorption band at 678.2 nm and a fluorescence-origin band at 679.1 nm. Zero-phonon holes associated with the lowest state have a width of approximately 0.05 cm-1 at 4.2 K, corresponding to a total effective dephasing time of approximately 400 ps. The temperature dependence of the zero-phonon holewidth indicates that this time constant is dominated at temperatures below 8 K by pure dephasing/spectral diffusion due to coupling of the optical transition to the glass-like two-level systems of the protein. Zero-phonon hole-widths obtained for the Chl b bands at 638.5 and 650.0 nm, at 4.2 K, lead to lower limits of 900 +/- 150 fs and 4.2 +/- 0.3 ps, respectively, for the Chl b-->Chl a energy-transfer times. Downward energy transfer from the Chl a state(s) at 665.0 nm occurs in 5.3 +/- 0.6 ps at 4.2 K.
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Affiliation(s)
- J Pieper
- Institute of Physics, Humboldt University, Berlin, Germany
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Affiliation(s)
- J. Pieper
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, and Ames Laboratory and Department of Chemistry, Iowa State University, Ames, Iowa 50011
| | - J. Voigt
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, and Ames Laboratory and Department of Chemistry, Iowa State University, Ames, Iowa 50011
| | - G. J. Small
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, and Ames Laboratory and Department of Chemistry, Iowa State University, Ames, Iowa 50011
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Pieper J, Rätsep M, Jankowiak R, Irrgang KD, Voigt J, Renger G, Small GJ. Qy-Level Structure and Dynamics of Solubilized Light-Harvesting Complex II of Green Plants: Pressure and Hole Burning Studies. J Phys Chem A 1999. [DOI: 10.1021/jp983957l] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Pieper
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - M. Rätsep
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - R. Jankowiak
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - K.-D. Irrgang
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - J. Voigt
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - G. Renger
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - G. J. Small
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
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Pieper J, Irrgang KD, Rätsep M, Jankowiak R, Schrötter T, Voigt J, Small GJ, Renger G. Effects of Aggregation on Trimeric Light-Harvesting Complex II of Green Plants: A Hole-Burning Study. J Phys Chem A 1999. [DOI: 10.1021/jp983958d] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. Pieper
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - K.-D. Irrgang
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - M. Rätsep
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - R. Jankowiak
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - Th. Schrötter
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - J. Voigt
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - G. J. Small
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - G. Renger
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
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Pieper J, Ott KH, Meyer B. Stabilization of the T1 fragment of glycophorin A(N) through interactions with N-and O-linked glycans. Nat Struct Biol 1996; 3:228-32. [PMID: 8605623 DOI: 10.1038/nsb0396-228] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Straty G, Pieper J, Hanley H. Contrast matched studies of a sheared binary colloidal suspension. Mol Phys 1991. [DOI: 10.1080/00268979100100181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- G.C. Straty
- a Thermophysics Division , National Institute of Standards and Technology , Boulder , Colorado , 80303 , U.S.A
| | - J. Pieper
- a Thermophysics Division , National Institute of Standards and Technology , Boulder , Colorado , 80303 , U.S.A
- b Department of Physics , University of Colorado , Boulder , Colorado , 80309 , U.S.A
| | - H.J.M. Hanley
- a Thermophysics Division , National Institute of Standards and Technology , Boulder , Colorado , 80303 , U.S.A
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Hendeles L, Hill M, Harman E, Moore P, Pieper J. Dose-response of inhaled diltiazem on airway reactivity to methacholine and exercise in subjects with mild asthma. Clin Pharmacol Ther 1988; 43:387-92. [PMID: 3281775 DOI: 10.1038/clpt.1988.48] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Methacholine challenges were performed by 10 asthmatic subjects, 2 hours before and 15 minutes after placebo (diluent alone) and 5, 10, 15, 30, and 60 mg inhaled diltiazem given in a single-blind crossover manner. There was no significant change from placebo in the dose of methacholine required to produce a 20% decrease in forced expiratory volume in the first second (FEV1) (PD20); the fold increase in PD20 from baseline was 1.1 +/- 0.1 after placebo, 1.4 +/- 0.2 after 5 mg, 1.8 +/- 0.3 after 10 mg, 1.4 +/- 0.2 after 15 mg, 1.6 +/- 0.2 after 30 mg, and 1.2 +/- 0.1 after 60 mg. There was a 1% chance that we missed a twofold difference between placebo and the 10 mg dose because of inadequate sample size. Fifteen minutes before a standardized exercise challenge, 10 subjects received placebo, 10 mg, and the highest dose tolerated during the methacholine study (20 to 45 mg) in a randomized double-blind crossover design. The mean +/- SE maximum postexercise decrease in FEV1 was 28.8% +/- 5.7% after placebo, 23.4% +/- 4.6% after 10 mg, and 20.8% +/- 3.0% after high-dose diltiazem (P greater than 0.05). There was a 12% chance that we missed a 15% difference between placebo and the high-dose regimen because of inadequate sample size. We conclude that diltiazem does not attenuate airway reactivity to methacholine or exercise even when high concentrations are delivered to the lungs.
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Affiliation(s)
- L Hendeles
- Department of Pharmacy Practice, College of Pharmacy, University of Florida, Gainesville 32610
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Harman E, Hill M, Fiebelman R, Pieper J, Hendeles L. The effect of oral diltiazem on airway reactivity to methacholine and exercise in subjects with mild intermittent asthma. Am Rev Respir Dis 1987; 136:1179-82. [PMID: 3314613 DOI: 10.1164/ajrccm/136.5.1179] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The effect of increasing doses of oral diltiazem on airway reactivity to methacholine was evaluated in 10 volunteers with mild asthma. Then the highest tolerated dose was compared with placebo in preventing exercise-induced bronchoconstriction. Methacholine challenges were performed 1 h before and 100 min after placebo or after 30, 60, 90, 120, or 180 mg of oral diltiazem, given in a single-blind, crossover manner on different days within 2 wk. Diltiazem, at doses above 60 mg prolonged the P-R interval of the electrocardiograph but had no significant effect on FVC, FEV1, or FEF25-75. The mean +/- SEM ratio of the dose of methacholine required to produce a 20% decrease in FEV1 (PD20) after diltiazem to the PD20 before diltiazem, i.e., the fold increase in PD20, was not significantly different from placebo at any dose: 0.93 +/- 0.11 after placebo, 1.2 +/- 0.1 after 30 mg, 1.3 +/- 0.3 after 60 mg, 1.2 +/- 0.2 after 90 mg, 1.1 +/- 0.1 after 120 mg, and 1.0 +/- 0.1 after 180 mg. One hundred minutes before a standardized exercise challenge, 120 to 180 mg of oral diltiazem and identically appearing placebo tablets were administered in a randomized, double-blind, crossover design on separate days at least 48 h apart. The mean +/- SEM maximal postexercise decrease in FEV1 was 25.5 +/- 3.3% after placebo and 17.0 +/- 4.8% after diltiazem (p less than 0.01). There was no correlation between change in FEV1 and serum concentrations of diltiazem or its active metabolite desacetyldiltiazem.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- E Harman
- Department of Pharmacy Practice, College of Pharmacy, University of Florida, Gainesville 32610
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Joyal M, Feldman RL, Cremer K, Pieper J, Hill JA, Pepine CJ. Systemic and coronary hemodynamic effects of combined intravenous diltiazem and nitroglycerin administration. Am Heart J 1987; 113:1376-82. [PMID: 3109225 DOI: 10.1016/0002-8703(87)90651-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
This study evaluated left ventricular (LV) and coronary hemodynamic effects of intravenous nitroglycerin (NTG) in the presence of an intravenous infusion of diltiazem in 15 patients with severe coronary disease. Diltiazem (250 microgram/kg bolus followed by 1.4 micrograms/kg/min infusion) alone decreased mean systemic blood pressure (mean 6%) without changing heart rate or LV end-diastolic pressure. The rate of rise in LV pressure declined slightly (4%), and peripheral resistance decreased (19%). Coronary sinus (CS) and great cardiac vein (GCV) flows were preserved. Addition of NTG (average, 68 micrograms/min) decreased systemic pressure further (7%) as LV end-diastolic pressure declined (5 mm Hg). These pressure changes were accompanied by a 10% increase in heart rate (compared with the heart rate found with diltiazem alone). Peripheral resistance was similar to values after diltiazem alone. The CS and GCV flows did not decrease. The sequence of intravenous drug administration was reversed in three other patients with combination therapy, producing similar effects, regardless of which drug was administered first. Hemodynamic effects of intravenous diltiazem alone and its combination with intravenous NTG seemed potentially favorable for patients with ischemic heart disease.
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Abstract
To investigate the mechanism of relief of angina pectoris by diltiazem administration, 14 patients with effort angina were studied using a protocol to control heart rate. Coronary, systemic and left ventricular (LV) hemodynamic function was assessed at rest and during tachycardia stress (atrial pacing)-induced angina before and during diltiazem infusion. Angina occurred in all patients during tachycardia stress before diltiazem administration. During tachycardia stress at the heart rate that produced angina after diltiazem infusion, pressure-rate product, coronary sinus flow and resistance and ST-segment depression were all similar to findings before diltiazem. Although at the onset of angina, systolic pressure was usually slightly lower after diltiazem infusion (138 +/- 11 vs 128 +/- 11 mm Hg, p less than 0.05), the pacing rate at onset of angina was higher in only 3 patients and the pressure-rate product was higher in only 1 patient. After diltiazem, left ventricular end-diastolic pressure increased less frequently after interruption of pacing. The results suggest that diltiazem favorably alters the relation between myocardial oxygen demand and supply at rest, but during tachycardia, anginal threshold and coronary reserve do not change. Diltiazem's potent antianginal action, shown in previous investigations using exercise-induced angina, is not prominent when heart rate is controlled. The major benefit of diltiazem in patients with stress-induced angina is related to reduction of myocardial oxygen demand rather than improved myocardial oxygen delivery.
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Abstract
The diltiazem serum concentration and the magnitude and time course of systemic and coronary hemodynamic and ECG responses to intravenous diltiazem (250 micrograms/kg intravenous bolus plus 1.4 micrograms/kg/min infusion) were investigated in 14 patients with chronic stable angina pectoris. After 3, 8, and 15 minutes this dosing schedule produced serum concentrations of 570 +/- 259, 199 +/- 62, and 136 +/- 30 ng/ml, respectively (mean +/- SD). These drug levels were associated with a small, transient increase in heart rate (6 bpm, mean) at 3 minutes, which occurred during the nadir of the blood pressure response. But at 8 and 15 minutes, heart rate was unchanged compared to control rates, although blood pressure remained decreased (19%, p less than 0.01 at 15 minutes). Pressure-rate product was significantly reduced as left ventricular end-diastolic pressure and dP/dT remained unchanged. Systemic resistance decreased 17% (p less than 0.05) and stroke index increased 10% (p less than 0.01). Coronary flow was maintained as coronary resistance declined (14%, p less than 0.01). PR interval prolongation (14%, p less than 0.01) occurred at 15 minutes. Correlations between changes in systolic, diastolic, and mean pressures and drug concentration were significant (r = -0.59, -0.80, and -0.78, respectively, all p less than 0.05). The intercept for each regression line was approximately 96 ng/ml diltiazem concentration, suggesting that this represents the minimum effective diltiazem serum concentration. These results indicate that intravenous diltiazem is well tolerated and promptly reduces blood pressure and both systemic and coronary resistances without oxygen-wasting effects of an increase in heart rate.
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