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Habeck T, Maciel EVS, Kretschmer K, Lermyte F. Charge site manipulation to enhance top-down fragmentation efficiency. Proteomics 2024; 24:e2300082. [PMID: 37043727 DOI: 10.1002/pmic.202300082] [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: 02/10/2023] [Revised: 04/05/2023] [Accepted: 04/06/2023] [Indexed: 04/14/2023]
Abstract
In recent years, top-down mass spectrometry has become a widely used approach to study proteoforms; however, improving sequence coverage remains an important goal. Here, two different proteins, α-synuclein and bovine carbonic anhydrase, were subjected to top-down collision-induced dissociation (CID) after electrospray ionisation. Two high-boiling solvents, DMSO and propylene carbonate, were added to the protein solution in low concentration (2%) and the effects on the top-down fragmentation patterns of the proteins were systematically investigated. Each sample was measured in triplicate, which revealed highly reproducible differences in the top-down CID fragmentation patterns in the presence of a solution additive, even if the same precursor charge state was isolated in the quadrupole of the instrument. Further investigation supports the solution condition-dependent selective formation of different protonation site isomers as the underlying cause of these differences. Higher sequence coverage was often observed in the presence of additives, and the benefits of this approach became even more evident when datasets from different solution conditions were combined, as increases up to 35% in cleavage coverage were obtained. Overall, this approach therefore represents a promising opportunity to increase top-down fragmentation efficiency.
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Affiliation(s)
- Tanja Habeck
- Department of Chemistry, Clemens-Schöpf-Institute of Chemistry and Biochemistry, Technical University of Darmstadt, Darmstadt, Hessen, Germany
| | - Edvaldo Vasconcelos Soares Maciel
- Department of Chemistry, Clemens-Schöpf-Institute of Chemistry and Biochemistry, Technical University of Darmstadt, Darmstadt, Hessen, Germany
| | - Kevin Kretschmer
- Department of Chemistry, Clemens-Schöpf-Institute of Chemistry and Biochemistry, Technical University of Darmstadt, Darmstadt, Hessen, Germany
| | - Frederik Lermyte
- Department of Chemistry, Clemens-Schöpf-Institute of Chemistry and Biochemistry, Technical University of Darmstadt, Darmstadt, Hessen, Germany
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2
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Kretschmer K, Zellmann T, Mörl K, Beck-Sickinger AG. Stable Binding of Full-Length Chemerin Is Driven by Negative Charges in the CMKLR1 N Terminus. Chembiochem 2023; 24:e202300280. [PMID: 37186779 DOI: 10.1002/cbic.202300280] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/12/2023] [Accepted: 05/15/2023] [Indexed: 05/17/2023]
Abstract
The adipokine chemerin is the endogenous ligand of the chemokine-like receptor 1 (CMKLR1), a member of the family of G protein-coupled receptors (GPCRs). This protein ligand plays an important role in obesity and inflammatory processes. Stable receptor-ligand interactions are highly relevant for its different physiological effects such as the migration of immune cells towards sites of inflammation. Here, we demonstrate that negative charges in the CMKLR1 N terminus are involved in the formation of strong contacts with a specific positively charged patch at the surface of full-length chemerin, which is absent in the short nonapeptide agonist chemerin-9, thus explaining its reduced affinity. Using receptor chimera of G protein-coupled receptor 1 (GPR1) and CMKLR1, we were able to identify the residues of this interaction and its relevance for stable full-length chemerin binding. This could help to develop more potent ligands for the treatment of inflammation-related diseases.
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Affiliation(s)
- Kevin Kretschmer
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103, Leipzig, Germany
| | - Tristan Zellmann
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103, Leipzig, Germany
| | - Karin Mörl
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103, Leipzig, Germany
| | - Annette G Beck-Sickinger
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103, Leipzig, Germany
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3
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Kretschmer K, Stichel J, Bellmann-Sickert K, Baumann L, Bierer D, Riedl B, Beck-Sickinger AG. Pinpointing the interaction site between semaphorin-3A and its inhibitory peptide. J Pept Sci 2023; 29:e3460. [PMID: 36285908 DOI: 10.1002/psc.3460] [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] [Received: 07/25/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 11/05/2022]
Abstract
Semaphorin-3A (Sema-3A) is a chemorepellant protein with various biological functions, including kidney development. It interacts with a protein complex consisting of the receptors neuropilin-1 (NRP-1) and plexin-A1. After acute kidney injury, Sema-3A is overexpressed and secreted, leading to a loss of kidney function. The development of peptide inhibitors is a promising approach to modulate the interaction of Sema-3A with its receptor NRP-1. Few interaction points between these binding partners are known. However, an immunoglobulin-like domain-derived peptide of Sema-3A has shown a positive effect on cell proliferation. To specify these interactions between the peptide inhibitor and the Sema-3A-NRP-1 system, the peptides were modified with the photoactivatable amino acids 4-benzoyl-l-phenylalanine or photo-l-leucine by solid-phase peptide synthesis. Activity was tested by an enzyme-linked immunosorbent-based binding assay, and crosslinking experiments were analyzed by Western blot and mass spectrometry, demonstrating a specific binding site of the peptide at Sema-3A. The observed signals for Sema-3A-peptide interaction were found in a defined area of the Sema domain, which was also demonstrated to be involved in NRP-1 binding. The presented data identified the interaction site for further development of therapeutic peptides to treat acute kidney injury by blocking the Sema-3A-NRP-1 interaction.
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Affiliation(s)
- Kevin Kretschmer
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Leipzig, Germany
| | - Jan Stichel
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Leipzig, Germany
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Czerniak AS, Kretschmer K, Weiß T, Beck-Sickinger AG. The Chemerin Receptor CMKLR1 Requires Full-Length Chemerin for High Affinity in Contrast to GPR1 as Demonstrated by a New Nanoluciferase-Based Binding Assay. ChemMedChem 2022; 17:e202200413. [PMID: 36178206 PMCID: PMC10092101 DOI: 10.1002/cmdc.202200413] [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] [Received: 07/26/2022] [Revised: 09/23/2022] [Indexed: 01/14/2023]
Abstract
To study the binding mode of the adipokine chemerin as well as the short peptide agonist chemerin-9 (C9) to its two receptors chemokine-like receptor 1 (CMKLR1) and G protein-coupled receptor 1 (GPR1), we generated 5-carboxytetramethylrhodamine (TAMRA) modified variants of both ligands. In addition, we labeled GPR1 and CMKLR1 with a nanoluciferase at the N-terminus to perform NanoBRET binding assays. For GPR1, both ligands show high affinity and comparable binding. Significant differences were found for CMKLR1, whereby only full-length chemerin binds with high affinity in saturation and displacement assays. For TAMRA-C9 a biphasic binding consisting of two binding states has been found and no displacement studies could be performed. Thus, we conclude that CMKLR1 requires full-length chemerin for stable binding in contrast to GPR1. This work demonstrates the NanoBRET binding assay as a new tool for binding studies at chemerin receptors and it enables deeper insights into the ligand binding parameters.
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Affiliation(s)
- Anne Sophie Czerniak
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103, Leipzig, Germany
| | - Kevin Kretschmer
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103, Leipzig, Germany
| | - Tina Weiß
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103, Leipzig, Germany
| | - Annette G Beck-Sickinger
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103, Leipzig, Germany
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Potente H, Kretschmer K, Hofmann J, Senge M, Mours M, Scheel G, Winkelmann T. Process Behavior of Special Mixing Elements in Twin-screw Extruders. INT POLYM PROC 2022. [DOI: 10.1515/ipp-2001-0005] [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: 11/15/2022]
Abstract
Abstract
Tightly intermeshing, co-rotating twin-screw extruders are commonly employed for tasks requiring good mixing. The modular structure of both barrel and screw makes it possible to optimize the extruder configuration for a given task. Increasing demands on polymers have resulted in the development of more sophisticated mixing elements. In the framework of this investigation we looked at the pressure-throughput behavior of mixing elements in a conveying, reconveying and conveying-reconveying configuration. Furthermore, the local residence time distribution within those elements was investigated. We developed physical-mathematical models to describe the pressure – throughput behavior observed in the experimental investigations.
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Affiliation(s)
- H. Potente
- Institut für Kunststofftechnik, University of Paderborn , Paderborn Germany
| | - K. Kretschmer
- Institut für Kunststofftechnik, University of Paderborn , Paderborn Germany
| | - J. Hofmann
- Institut für Kunststofftechnik, University of Paderborn , Paderborn Germany
| | - M. Senge
- BASF AG , Ludwigshafen , Germany
| | - M. Mours
- BASF AG , Ludwigshafen , Germany
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Chmelova H, Cohrs CM, Chouinard JA, Petzold C, Kretschmer K, Speier S. Functional and morphological beta cell plasticity after arrest of autoimmune diabetes. DIABETOL STOFFWECHS 2014. [DOI: 10.1055/s-0034-1374864] [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]
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Potente H, Kretschmer K, Pohl T. Physico-Mathematical Model for the Description of the Temperature Development and the Power Consumption in Co-Rotating Twin Screw Extruders. INT POLYM PROC 2013. [DOI: 10.3139/217.1800] [Citation(s) in RCA: 6] [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: 11/20/2022]
Abstract
Abstract
Tightly intermeshing, co-rotating twin-screw extruders are commonly employed for tasks requiring good mixing. The modular constitution of both barrel and screw makes it possible to optimise the extruder configuration for a given task. Even today this optimisation is frequently done by applying the “Trial and Error”-method. Physico-mathematical models enable the process engineer to predict the process behaviour of a chosen extruder configuration and to optimise existing extrusion processes.
Increasing demands in mixing quality and efficiency of the processing unit result in efforts to optimise existing extruders with respect to those factors. For this reason knowledge concerning the temperature profile along the screw and the power consumption is essential. We present a new physico-mathematical model for the description of the temperature development. At stages where the analytical solution itself would result in a not satisfying degree of accuracy we used descriptions based on finite element simulation results to achieve the desired exactness. As a result we got a model to describe the temperature development in the screw channel and a model to describe the power consumption in different screw sections. Applying these models it is possible to optimise the process parameters and the screw configuration with only a minimum of preceding experimental investigations.
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Affiliation(s)
- H. Potente
- Institut für Kunststofftechnik, University of Paderborn, Germany
| | - K. Kretschmer
- Süddeutsches Kunststoff-Zentrum, Kunststoff-Forschung und -Entwicklung, Würzburg, Germany
| | - T. Pohl
- Troester Maschinenfabrik, Hannover, Germany
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Krumbholz N, Hochrein T, Vieweg N, Radovanovic I, Pupeza I, Schubert M, Kretschmer K, Koch M. Degree of dispersion of polymeric compounds determined with terahertz time-domain spectroscopy. POLYM ENG SCI 2010. [DOI: 10.1002/pen.21798] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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9
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Buchweitz J, Petzold C, Schallenberg S, Kretschmer K. Promoting antigen-specific immunological tolerance in autoimmune diabetes. DIABETOL STOFFWECHS 2009. [DOI: 10.1055/s-0029-1221871] [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: 10/20/2022]
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10
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Vécsei V, Opitz A, Kretschmer K. Aortenbogenlängsruptur. Thorac Cardiovasc Surg 2008. [DOI: 10.1055/s-0028-1096668] [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: 10/21/2022]
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Walter U, Toepfer T, Dittmar KEJ, Kretschmer K, Lauber J, Weiss S, Servos G, Lechner O, Scherbaum WA, Bornstein SR, Von Boehmer H, Buer J. Pancreatic NOD beta cells express MHC class II protein and the frequency of I-A(g7) mRNA-expressing beta cells strongly increases during progression to autoimmune diabetes. Diabetologia 2003; 46:1106-14. [PMID: 12856083 DOI: 10.1007/s00125-003-1164-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2003] [Revised: 03/19/2003] [Indexed: 10/26/2022]
Abstract
AIMS/HYPOTHESIS In the NOD mouse model, attempts to show MHC class II expression by pancreatic beta cells were unsuccessful so far. We readdressed this question by analysing I-A(g7) expression in single pancreatic beta cells. METHODS Single-cell multiplex RT PCR and single-cell immunofluorescence were used to study MHC class II expression in NOD and NOD/SCID beta cells. RESULTS Pancreatic beta cells from NOD mice express the I-A(g7) protein as well as the corresponding mRNA. The frequency of MHC class II mRNA-expressing beta cells is drastically increased during the progression to overt diabetes. MHC class II protein is accumulated intracellularly, and invariant chain is co-expressed. Beta cells from 9- to 10-week-old NOD/SCID mice express MHC class II at the same low frequency as beta cells from 3-week-old NOD mice. CONCLUSION/INTERPRETATION NOD beta cells express I-A(g7) and could be a direct target of autoreactive CD4+ T cells. This MHC class II expression is triggered by infiltrating lymphocytes.
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Affiliation(s)
- U Walter
- Department of Cellbiology and Immunology, German Research Centre for Biotechnology, Braunschweig, Germany.
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13
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Kretschmer K, Engel H, Weiss S. Correction: Strong antigenic selection shaping the immunoglobulin heavy chain repertoire of B-1a lymphocytes in λ2315 transgenic mice (Eur. J. Immunol. 7/2003). Eur J Immunol 2003. [DOI: 10.1002/eji.200390037] [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: 11/07/2022]
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14
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Potente H, Kretschmer K, Hofmann J, Senge M, Mours M, Scheel G, Winkelmann T. Process Behavior of Special Mixing Elements in Twin-screw Extruders. INT POLYM PROC 2001. [DOI: 10.3139/217.1664] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Kretschmer K, Helbig W. Mikroebulliometrische Molmassenbestimmung von α-Methylstyren- Acrylnitril-Cooligomeren mittels digital anzeigenden Differenzthermometers. Z PHYS CHEM 1987. [DOI: 10.1515/zpch-1987-26891] [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: 11/15/2022]
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17
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18
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Lasch J, Berdichevsky VR, Torchilin VP, Koelsch R, Kretschmer K. A method to measure critical detergent parameters. Preparation of liposomes. Anal Biochem 1983; 133:486-91. [PMID: 6638509 DOI: 10.1016/0003-2697(83)90114-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A simple physical method to determine the monomer concentration of detergents below as well as above the critical micelle concentration based on the bubble-pressure measurement is described. Aggregated surfactant molecules (micelles) and phospholipid vesicles if present in the sample will not disturb the measurements. Three applications of the method relevant to the preparation of liposomes are shown: (i) measurements of critical micelle concentrations, (ii) evaluation of the affinity constant of the interaction of detergents with liposomal membranes, and (iii) monitoring of residual detergent in liposome preparations during dialysis or after gel chromatography of mixed micelle-derived liposomes. It was found that the efficiency of detergents to produce liposomes during their removal depends on their critical micelle concentrations as well as on their affinity to liposomal membranes.
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19
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Gast K, Zirwer D, Ladhoff AM, Schreiber J, Koelsch R, Kretschmer K, Lasch J. Auto-oxidation-induced fusion of lipid vesicles. Biochim Biophys Acta 1982; 686:99-109. [PMID: 7066323 DOI: 10.1016/0005-2736(82)90155-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Spontaneous size changes of small unilamellar vesicles with initial mean diameters of 25 nm measured by quasi-elastic light scattering (QELS) and electron microscopy are reported. After the size conversion the vesicles have mean diameters of about 70 nm and are of the unilamellar and multilamellar type. The fact that auto-oxidation initiates this process is established by the comparison of the results for vesicles which differ only in the degree of auto-oxidation. The role of phosphatidylcholine hydroperoxides as fusogens is discussed.
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20
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Kretschmer K, Sorger H. [Procedure for directly measuring the temperature in spectrophotometer cuvettes]. Z Med Lab Diagn 1979; 20:235-8. [PMID: 506383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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21
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Vécsei V, Opitz A, Kretschmer K. [Longitudinal rupture of the aortic arche (author's transl)]. Thoraxchir Vask Chir 1978; 26:434-6. [PMID: 751287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This is a case report of a 75 year old man who sustained a longitudinal rupture of the aortic arch in addition to cerebral and extremity trauma following a traffic accident. An emergency operation without the use of the heart-lung-machine could not save the patient's life. Possible mechanisms leading to this unusual damage to the aortic arch are discussed.
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22
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Kleine R, Uhlig H, Kretschmer K, Marguardt I. [Isolation and characterization of trypsins from crayfishes]. Enzymologia 1972; 42:155-73. [PMID: 4623554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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23
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Kretschmer K, Kollin G. [Crystalline leucine aminopeptidase from bovine lens. Determination of shape and hydration by small angle x-ray diffraction]. Hoppe Seylers Z Physiol Chem 1969; 350:431-8. [PMID: 5798586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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24
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Kretschmer R, Jeannet M, Mereu TR, Kretschmer K, Winn H, Rosen FS. Hereditary thymic dysplasia: a graft-versus-host reaction induced by bone marrow cells with a partial 4a series histoincompatibility. Pediatr Res 1969; 3:34-40. [PMID: 4885730 DOI: 10.1203/00006450-196901000-00005] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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25
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Kettmann U, Kretschmer K, Hanson H. [Crystalline leucine aminopeptidase from bovine lens. Amino acid composition and N-terminal amino acids, II]. Hoppe Seylers Z Physiol Chem 1968; 349:1537-1542. [PMID: 5745905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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26
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Kretschmer K. [Crystallized leucine aminopeptidase from bovine lens. Physical constants. 3. Optical rotatory dispersion]. Hoppe Seylers Z Physiol Chem 1968; 349:846-56. [PMID: 5722827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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27
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Kretschmer K, Hanson H. [Crystallized leucine aminopeptidase from bovine lens. Studies on the subunits: physical constants]. Hoppe Seylers Z Physiol Chem 1968; 349:831-45. [PMID: 5722826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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28
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Kretschmer K. [Crystallized leucine aminopeptidase from bovine crystalline lenses. Determination of molecular shape and molar mass by electron optic studies]. Hoppe Seylers Z Physiol Chem 1968; 349:715-8. [PMID: 5697801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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29
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Kretschmer K. [Determination of the net molecular weight of protein subunits obtained with sodium dodecyl sulfate]. Hoppe Seylers Z Physiol Chem 1967; 348:1723-4. [PMID: 5586924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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30
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Kretschmer K. [Crystallized leucine aminopeptidase from bovine eye lens. Physical constants, II. Degree of hydration and shape determination by means of hydrodynamic methods]. Hoppe Seylers Z Physiol Chem 1967; 348:1158-62. [PMID: 5588276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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31
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Hanson H, Hütter HJ, Mannsfeldt HG, Kretschmer K, Sohr C. [On the demonstration and substrate specificity of a kidney particle aminopeptidase distinguishable from leucine aminopeptidase]. Hoppe Seylers Z Physiol Chem 1967; 348:680-8. [PMID: 5601647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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32
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Kretschmer K. [On the specificity of carbohydrate determination in proteins with the anthrone method]. Hoppe Seylers Z Physiol Chem 1965; 341:146-148. [PMID: 5876227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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