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Harre J, Heinkele L, Steffens M, Warnecke A, Lenarz T, Just I, Rohrbeck A. Potentiation of Brain-Derived Neurotrophic Factor-Induced Protection of Spiral Ganglion Neurons by C3 Exoenzyme/Rho Inhibitor. Front Cell Neurosci 2021; 15:602897. [PMID: 33776650 PMCID: PMC7991574 DOI: 10.3389/fncel.2021.602897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 02/19/2021] [Indexed: 11/17/2022] Open
Abstract
Preservation of the excitability of spiral ganglion neurons (SGN) may contribute to an improved speech perception after cochlear implantation. Thus, the application of exogenous neurotrophic factors such as the neurotrophin brain-derived neurotrophic factor (BDNF) to increase SGN survival in vitro and in vivo is a promising pharmacological approach in cochlear implant (CI) research. Due to the difficult pharmacokinetic profile of proteins such as BDNF, there is a quest for small molecules to mediate the survival of SGN or to increase the efficacy of BDNF. The C3 exoenzyme from Clostridium botulinum could be a potential new candidate for the protection and regeneration of SGN. Inhibition of the RhoA GTPase pathway which can be mediated by C3 is described as a promising strategy to enhance axonal regeneration and to exert pro-survival signals in neurons. Nanomolar concentrations of C3, its enzymatically inactive form C3E174Q, and a 26mer C-terminal peptide fragment covering amino acid 156–181 (C3156-181) potentiated the neuroprotective effect on SGN mediated by BDNF in vitro. The neuroprotective effect of C3/BDNF was reduced to the neuroprotective effect of BDNF alone after the treatment with wortmannin, an inhibitor of the phosphatidylinositol-3-kinase (PI3K).The exoenzyme C3 (wild-type and enzyme-deficient) and the C3 peptide fragment C3154–181 present novel biologically active compounds for the protection of the SGN. The exact underlying intracellular mechanisms that mediate the neuroprotective effect are not clarified yet, but the combination of BDNF (TrkB stimulation) and C3 exoenzyme (RhoA inhibition) can be used to protect SGN in vitro.
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Affiliation(s)
- Jennifer Harre
- Department of Otorhinolaryngology, Head and Neck Surgery, Hannover Medical School, Hannover, Germany.,Cluster of Excellence "Hearing4all" of the German Research Foundation (EXC 2177/1), Hannover, Germany
| | - Laura Heinkele
- Department of Otorhinolaryngology, Head and Neck Surgery, Hannover Medical School, Hannover, Germany
| | - Melanie Steffens
- Department of Otorhinolaryngology, Head and Neck Surgery, Hannover Medical School, Hannover, Germany
| | - Athanasia Warnecke
- Department of Otorhinolaryngology, Head and Neck Surgery, Hannover Medical School, Hannover, Germany.,Cluster of Excellence "Hearing4all" of the German Research Foundation (EXC 2177/1), Hannover, Germany
| | - Thomas Lenarz
- Department of Otorhinolaryngology, Head and Neck Surgery, Hannover Medical School, Hannover, Germany.,Cluster of Excellence "Hearing4all" of the German Research Foundation (EXC 2177/1), Hannover, Germany
| | - Ingo Just
- Institute of Toxicology, Hannover Medical School, Hannover, Germany
| | - Astrid Rohrbeck
- Institute of Toxicology, Hannover Medical School, Hannover, Germany
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2
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Erdmann J, Preusse M, Khaledi A, Pich A, Häussler S. Environment-driven changes of mRNA and protein levels in Pseudomonas aeruginosa. Environ Microbiol 2018; 20:3952-3963. [DOI: 10.1111/1462-2920.14419] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 09/13/2018] [Accepted: 09/15/2018] [Indexed: 12/27/2022]
Affiliation(s)
- Jelena Erdmann
- Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research; Institute for Molecular Bacteriology, TWINCORE GmbH; Hannover Germany
- Centre for Pharmacology and Toxicology; Research Core Unit Proteomics and Institute of Toxicology, Hannover Medical School; Hannover Germany
| | - Matthias Preusse
- Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research; Institute for Molecular Bacteriology, TWINCORE GmbH; Hannover Germany
- Department of Molecular Bacteriology, Helmholtz Center for Infection Research; Braunschweig Germany
| | - Ariane Khaledi
- Department of Molecular Bacteriology, Helmholtz Center for Infection Research; Braunschweig Germany
| | - Andreas Pich
- Centre for Pharmacology and Toxicology; Research Core Unit Proteomics and Institute of Toxicology, Hannover Medical School; Hannover Germany
| | - Susanne Häussler
- Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research; Institute for Molecular Bacteriology, TWINCORE GmbH; Hannover Germany
- Department of Molecular Bacteriology, Helmholtz Center for Infection Research; Braunschweig Germany
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3
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Schröder A, Benski A, Oltmanns A, Just I, Rohrbeck A, Pich A. MS-based quantification of RhoA/B and RhoC ADP-ribosylation. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1092:268-271. [PMID: 29933219 DOI: 10.1016/j.jchromb.2018.06.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 05/22/2018] [Accepted: 06/03/2018] [Indexed: 02/02/2023]
Abstract
Mono ADP-ribosylation is a common characteristic of bacterial toxins resulting to aberrant activation or inactivation of target proteins. The C3 exoenzyme of Clostridium botulinum (C3bot) ADP-ribosylates the small GTPases RhoA, RhoB and RhoC, leading to inactivation of these important regulators and impaired down-stream signaling. Quantification of ADP-ribosylation using gel migration assays, antibodies, and radioactivity-based methods are limited. Therefore a novel LC-MS-based method to specifically determine and quantify ADP-ribosylation of Rho GTPases was established. A heavy labeled protein standard that contained ADP-ribosylation specific peptides in similar amounts in ADP ribosylated and non ADP ribosylated form was used for relative quantification in vivo. In a proof of principle experiment HT22 cells were treated with C3bot and the kinetics of RhoA/B and RhoC ADP-ribosylation were determined in vivo.
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Affiliation(s)
- Anke Schröder
- Hannover Medical School, Institute of Toxicology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Anastasia Benski
- Hannover Medical School, Institute of Toxicology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Anne Oltmanns
- Hannover Medical School, Institute of Toxicology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Ingo Just
- Hannover Medical School, Institute of Toxicology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Astrid Rohrbeck
- Hannover Medical School, Institute of Toxicology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Andreas Pich
- Hannover Medical School, Institute of Toxicology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
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4
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Junemann J, Lämmerhirt CM, Polten F, Just I, Gerhard R, Genth H, Pich A. Quantification of small GTPase glucosylation by clostridial glucosylating toxins using multiplexed MRM analysis. Proteomics 2017; 17. [PMID: 28252257 DOI: 10.1002/pmic.201700016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 02/10/2017] [Accepted: 02/28/2017] [Indexed: 12/29/2022]
Abstract
Large clostridial toxins mono-O-glucosylate small GTPases of the Rho and Ras subfamily. As a result of glucosylation, the GTPases are inhibited and thereby corresponding downstream signaling pathways are disturbed. Current methods for quantifying the extent of glucosylation include sequential [14 C]glucosylation, sequential [32 P]ADP-ribosylation, and Western Blot detection of nonglucosylated GTPases, with neither method allowing the quantification of the extent of glucosylation of an individual GTPase. Here, we describe a novel MS-based multiplexed MRM assay to specifically quantify the glucosylation degree of small GTPases. This targeted proteomics approach achieves a high selectivity and reproducibility, which allows determination of the in vivo substrate pattern of glucosylating toxins. As proof of principle, GTPase glucosylation was analyzed in CaCo-2 cells treated with TcdA, and glucosylation kinetics were determined for RhoA/B, RhoC, RhoG, Ral, Rap1, Rap2, (H/K/N)Ras, and R-Ras2.
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Affiliation(s)
- Johannes Junemann
- Hannover Medical School, Institute for Toxicology, Hannover, Germany
| | | | - Felix Polten
- Hannover Medical School, Institute for Toxicology, Hannover, Germany
| | - Ingo Just
- Hannover Medical School, Institute for Toxicology, Hannover, Germany
| | - Ralf Gerhard
- Hannover Medical School, Institute for Toxicology, Hannover, Germany
| | - Harald Genth
- Hannover Medical School, Institute for Toxicology, Hannover, Germany
| | - Andreas Pich
- Hannover Medical School, Institute for Toxicology, Hannover, Germany
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5
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Schmitt HA, Pich A, Schröder A, Scheper V, Lilli G, Reuter G, Lenarz T. Proteome Analysis of Human Perilymph Using an Intraoperative Sampling Method. J Proteome Res 2017; 16:1911-1923. [DOI: 10.1021/acs.jproteome.6b00986] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Heike A. Schmitt
- Department
of Otolaryngology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
- Cluster
of Excellence of the German Research Foundation (DFG; “Deutsche
Forschungsgemeinschaft”) “Hearing4all”, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Andreas Pich
- Core
Facility Proteomics, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Anke Schröder
- Core
Facility Proteomics, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Verena Scheper
- Department
of Otolaryngology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
- Cluster
of Excellence of the German Research Foundation (DFG; “Deutsche
Forschungsgemeinschaft”) “Hearing4all”, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Giorgio Lilli
- Department
of Otolaryngology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
- Cluster
of Excellence of the German Research Foundation (DFG; “Deutsche
Forschungsgemeinschaft”) “Hearing4all”, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Günter Reuter
- Department
of Otolaryngology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
- Cluster
of Excellence of the German Research Foundation (DFG; “Deutsche
Forschungsgemeinschaft”) “Hearing4all”, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Thomas Lenarz
- Department
of Otolaryngology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
- Cluster
of Excellence of the German Research Foundation (DFG; “Deutsche
Forschungsgemeinschaft”) “Hearing4all”, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
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6
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Toxin A of the nosocomial pathogenClostridium difficileinduces primary effects in the proteome of HEp-2 cells. Proteomics Clin Appl 2016; 11. [DOI: 10.1002/prca.201600031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 10/14/2016] [Accepted: 11/08/2016] [Indexed: 12/28/2022]
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7
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Surface-bound bovine serum albumin carrier protein as present in recombinant cytokine preparations amplifies T helper 17 cell polarization. Sci Rep 2016; 6:36598. [PMID: 27808281 PMCID: PMC5093436 DOI: 10.1038/srep36598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 10/17/2016] [Indexed: 11/18/2022] Open
Abstract
Understanding of T helper 17 lineage (TH17) polarization has been significantly promoted by cell culture experiments that reduce the complexity of the in vivo environment. We here investigated TH17 amplification by coating of cytokine preparations. Cytokine preparations coated to the surface compared to the same amount given in solution significantly enhanced TH17 polarization assessed by flow cytometry and interleukin (IL)-17A, IL-17F and RORγt mRNA expression. T cell proliferation and TH1 polarization were similarly enhanced while TREG polarization was impeded. TH17 amplification was replicated by coating the plate with low amounts of FCS or albumin as used as carrier protein for cytokines (0.5 μl 0.1%). It was unaltered by filtration, protein digestion and arylhydrocarbon receptor blockade, not replicated by LPS and independent of integrin stimulation. TH17 amplification required anti-CD3 stimulation and was T cell intrinsic. Supernatants of CD4+ cells polarized on coated cytokine preparations with carrier albumin conferred amplification to fresh splenocytes. Coating markedly elevated CD4+ IL-22 mRNA expression and IL-22 blockade significantly reduced TH17 amplification. Our data show TH17 amplification by coated albumin in the low amounts present in recombinant cytokine preparations. This unexpected adjuvant like effect underscores the need for controls also for temporal and spatial factors in cell culture.
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8
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Krueger J, Pohl S, Preusse M, Kordes A, Rugen N, Schniederjans M, Pich A, Häussler S. Unravelling post-transcriptional PrmC-dependent regulatory mechanisms in Pseudomonas aeruginosa. Environ Microbiol 2016; 18:3583-3592. [PMID: 27376486 DOI: 10.1111/1462-2920.13435] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 06/28/2016] [Indexed: 02/04/2023]
Abstract
Transcriptional regulation has a central role in cellular adaptation processes and is well investigated. In contrast, the importance of the post-transcriptional regulation on these processes is less well defined. The technological advancements have been critical to precisely quantify protein and mRNA level changes and hold promise to provide more insights into how post-transcriptional regulation determines phenotypes. In Pseudomonas aeruginosa the methyltransferase PrmC methylates peptide chain release factors to facilitate translation termination. Loss of PrmC activity abolishes anaerobic growth and leads to reduced production of quorum sensing-associated virulence factors. Here, by applying SILAC technology in combination with mRNA-sequencing, they provide evidence that the P. aeruginosa phenotype can be attributed to a change in protein to mRNA ratios of selected protein groups. The UAG-dependent translation termination was more dependent on PrmC activity than the UAA- and UGA-dependent translation termination. Additionally, a bias toward UAG stop codons in global transcriptional regulators was found. The finding that this bias in stop codon usage determines the P. aeruginosa phenotype is unexpected and adds complexity to regulatory circuits. Via modulation of PrmC activity the bacterial cell can cross-regulate targets independently of transcriptional signals, a process with an underestimated impact on the bacterial phenotype.
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Affiliation(s)
- Jonas Krueger
- Institute for Molecular Bacteriology, TWINCORE GmbH, Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany.,Research Core Unit Proteomics and Institute of Toxicology, Hannover Medical School, Hannover, Germany
| | - Sarah Pohl
- Institute for Molecular Bacteriology, TWINCORE GmbH, Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany.,Department of Molecular Bacteriology, Helmholtz for Centre Infection Research, Braunschweig, Germany
| | - Matthias Preusse
- Institute for Molecular Bacteriology, TWINCORE GmbH, Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany.,Department of Molecular Bacteriology, Helmholtz for Centre Infection Research, Braunschweig, Germany
| | - Adrian Kordes
- Institute for Molecular Bacteriology, TWINCORE GmbH, Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany
| | - Nils Rugen
- Institute for Molecular Bacteriology, TWINCORE GmbH, Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany
| | - Monika Schniederjans
- Institute for Molecular Bacteriology, TWINCORE GmbH, Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany.,Department of Molecular Bacteriology, Helmholtz for Centre Infection Research, Braunschweig, Germany
| | - Andreas Pich
- Research Core Unit Proteomics and Institute of Toxicology, Hannover Medical School, Hannover, Germany
| | - Susanne Häussler
- Institute for Molecular Bacteriology, TWINCORE GmbH, Centre for Experimental and Clinical Infection Research, a joint venture of the Hannover Medical School and the Helmholtz Centre for Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany. .,Department of Molecular Bacteriology, Helmholtz for Centre Infection Research, Braunschweig, Germany.
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9
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Meinlschmidt P, Schweiggert-Weisz U, Brode V, Eisner P. Enzyme assisted degradation of potential soy protein allergens with special emphasis on the technofunctionality and the avoidance of a bitter taste formation. Lebensm Wiss Technol 2016. [DOI: 10.1016/j.lwt.2016.01.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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10
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Rohrbeck A, Fühner V, Schröder A, Hagemann S, Vu XK, Berndt S, Hust M, Pich A, Just I. Detection and Quantification of ADP-Ribosylated RhoA/B by Monoclonal Antibody. Toxins (Basel) 2016; 8:100. [PMID: 27043630 PMCID: PMC4848626 DOI: 10.3390/toxins8040100] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 03/20/2016] [Accepted: 03/29/2016] [Indexed: 01/03/2023] Open
Abstract
Clostridium botulinum exoenzyme C3 is the prototype of C3-like ADP-ribosyltransferases that modify the GTPases RhoA, B, and C. C3 catalyzes the transfer of an ADP-ribose moiety from the co-substrate nicotinamide adenine dinucleotide (NAD) to asparagine-41 of Rho-GTPases. Although C3 does not possess cell-binding/-translocation domains, C3 is able to efficiently enter intact cells, including neuronal and macrophage-like cells. Conventionally, the detection of C3 uptake into cells is carried out via the gel-shift assay of modified RhoA. Since this gel-shift assay does not always provide clear, evaluable results an additional method to confirm the ADP-ribosylation of RhoA is necessary. Therefore, a new monoclonal antibody has been generated that specifically detects ADP-ribosylated RhoA/B, but not RhoC, in Western blot and immunohistochemical assay. The scFv antibody fragment was selected by phage display using the human naive antibody gene libraries HAL9/10. Subsequently, the antibody was produced as scFv-Fc and was found to be as sensitive as a commercially available RhoA antibody providing reproducible and specific results. We demonstrate that this specific antibody can be successfully applied for the analysis of ADP-ribosylated RhoA/B in C3-treated Chinese hamster ovary (CHO) and HT22 cells. Moreover, ADP-ribosylation of RhoA was detected within 10 min in C3-treated CHO wild-type cells, indicative of C3 cell entry.
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Affiliation(s)
- Astrid Rohrbeck
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Viola Fühner
- Biotechnology and Bioinformatics, Department of Biotechnology, Institute for Biochemistry, Technische Universität Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany.
| | - Anke Schröder
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Sandra Hagemann
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Xuan-Khang Vu
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Sarah Berndt
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Michael Hust
- Biotechnology and Bioinformatics, Department of Biotechnology, Institute for Biochemistry, Technische Universität Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany.
| | - Andreas Pich
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Ingo Just
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
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