101
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Henkel S, Kleban M, Jäger V. Crystal structure of (3aS,4R,5S,6R,6aS)-4,5,6-tris-benzoyloxy-l-methylhexahydro- cyclopent(c)isoxazole, C28H25NO7. Z KRIST-NEW CRYST ST 1997. [DOI: 10.1524/ncrs.1997.212.1.55] [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: 11/24/2022]
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102
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Henkel S, Hasenöhrl T, Lieberknecht Α, Jäger V. Crystal structure of (1S,3R,4R,5S,6R)-4-0-benzyl-4.5-dihydroxy-3-hydroxymethyl- 2,7-dioxabicyclo-[4.3.0]nonan-8-on, C15H18O6. Z KRIST-NEW CRYST ST 1997. [DOI: 10.1524/ncrs.1997.212.1.219] [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: 11/24/2022]
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103
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Henkel S, Meunier Ν, Jäger V. Crystal structure of (2R,3S)-3-O-benzyl-2-benzylamino-3,4-dihydroxybutanenitrile,C18H20N2O2. Z KRIST-NEW CRYST ST 1997. [DOI: 10.1524/ncrs.1997.212.1.221] [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: 11/24/2022]
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104
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Henkel S, Gracza T, Jäger V. Crystal structure of (1S,5R,7R,8S)-7-benzyl-8-hydroxy-2,6-dioxabicyclo[3.3.0]octane-3-one, C13H14O4. Z KRIST-NEW CRYST ST 1997. [DOI: 10.1524/ncrs.1997.212.1.423] [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: 11/24/2022]
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105
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Peters K, Peters EM, Franz T, Jäger V. Crystal structure of (3S,4R,1'R)-1-benzyl-3-benzyloxy-4-(1'-benzyloxy-2'- hydroxyethyI)-azetidine-2-one, C26H27NO4. Z KRIST-NEW CRYST ST 1997. [DOI: 10.1524/ncrs.1997.212.1.421] [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: 11/24/2022]
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106
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Peters K, Peters EM, Schnering HGV, Burkhardt U, Jäger V. Crystal structure of 4-(1',3'-dioxolane-2'-yl)-3-methyl-1,2,5-oxadiazole-2- oxide, C6H8N2O4. Z KRIST-NEW CRYST ST 1997. [DOI: 10.1524/ncrs.1997.212.1.429] [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: 11/24/2022]
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107
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Henkel S, Kieß FM, Jäger V. Crystal structure of 1,4-dideoxy-1,4-imino-D-gulitol hydrochloride, C6H14CINO4. Z KRIST-NEW CRYST ST 1997. [DOI: 10.1524/ncrs.1997.212.1.217] [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: 11/24/2022]
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108
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Deutschmann SM, Jäger V. Optimization of the growth conditions of Sf21 insect cells for high-density perfusion culture in stirred-tank bioreactors. Enzyme Microb Technol 1994; 16:506-12. [PMID: 7764890 DOI: 10.1016/0141-0229(94)90022-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Spodoptera frugiperda insect cells (IPLB-Sf21-AE) (Sf21), infected with baculovirus expression vectors during their exponential growth phase, are commonly used to produce a variety of heterologous recombinant proteins. In the present study the culture conditions of these insect cells were studied to establish high-density suspension cultures with prolonged exponential growth phases. The Sf21 cells were grown in 125-ml spinner flasks using five different culture media supplemented with 5% fetal calf serum and four protein-free or low-protein culture media. The best results were achieved in EX-CELL 401 (protein-free media) and in IPL-41 modified with 2.5 g l-1 tryptose phosphate broth (serum-supplemented media), respectively. The latter was used for further batch and continuous cultivation of Sf21 cells in a perfused 1.4-l stirred-tank bioreactor with special attention to the oxygen requirement of these cells. Optimal growth was found at an oxygen concentration of 70% air saturation, resulting in a prolonged exponential growth phase that could be maintained for more than 16 days. A maximum cell density of 5.5 x 10(7) viable cells ml-1 was achieved.
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Affiliation(s)
- S M Deutschmann
- Gesellschaft für Biotechnologische Forschung mbH, Arbeitsgruppe Zellkulturtechnik, Braunschweig, Germany
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109
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Gebbert A, Alvarez-Icaza M, Peters H, Jäger V, Bilitewski U, Schmid RD. On-line monitoring of monoclonal antibody production with regenerable flow-injection immuno systems. J Biotechnol 1994; 32:213-20. [PMID: 7764714 DOI: 10.1016/0168-1656(94)90207-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In this paper two systems for the observation of the production of mouse-IgG during the cultivation of hybridoma cells in a perfusion reactor are presented. The direct immunosystem is based on the detection of changes in capacitance of a dielectric layer (tantalum oxide) on a metal surface (tantalum) when antibodies bind to immobilized anti-antibodies. The sensor consisted of a 25 nm tantalum oxide layer, electrochemically grown onto a laser patternized 1 micron thick tantalum layer. The indirect system is based on an automated fluorimetric sandwich ELISA system with beta-galactosidase conjugated secondary antibodies. Two cultivations of mouse hybridoma cells in a 2-1 perfusion reactor were performed. The first cultivation was monitored with the capacitance system, the second cultivation was monitored with the fluorimetric system.
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Affiliation(s)
- A Gebbert
- Gesellschaft für Biotechnologische Forschung (GBF), Department of Enzyme Technology, Braunschweig, Germany
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110
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Grabenhorst E, Hofer B, Nimtz M, Jäger V, Conradt HS. Biosynthesis and secretion of human interleukin 2 glycoprotein variants from baculovirus-infected Sf21 cells. Characterization of polypeptides and posttranslational modifications. Eur J Biochem 1993; 215:189-97. [PMID: 8344280 DOI: 10.1111/j.1432-1033.1993.tb18022.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Human interleukin 2 (IL-2) and human IL-2 mutant proteins, with artificially introduced N-glycosylation or O-glycosylation sites, have been expressed in a lepidopteran cell line (Sf21, Spodoptera frugiperda) using recombinant baculovirus vectors. Only approximately 25% of the total recombinant IL-2 protein synthesized by Sf21 cells was secreted into the culture medium. Significant N-terminal truncations were detected in the secreted polypeptides (up to 85% of the molecules). Alanine and proline were absent in the major truncated forms; the first 3-5 amino acids were also absent in a small proportion of the purified proteins. The introduction of potential artificial O-glycosylation peptide sequences (..GGKAPTPPPK..), to the C-terminus or between positions 80 and 81 of the IL-2 polypeptide chain, resulted in the secretion of unglycosylated and O-glycosylated variant forms. Fast atom bombardment mass spectrometry, compositional analysis and methylation analysis, of the tryptic glycopeptide APTPPPK, revealed the presence of either GalNAc or the disaccharide Gal(beta 1-3)GalNAc as the only carbohydrate constituents attached exclusively to Thr in this peptide, in a specific ratio for each individual IL-2 mutant protein. The Gal(beta 1-3)GalNAc protein forms could be partially altered in vitro to mammalian-type glycoforms by porcine liver beta-galactoside alpha-2,3-sialyltransferase in the presence of CMP-N-acetylneuraminic acid. An IL-2 mutant form, with an 11-amino-acid peptide of human interferon-beta at position 4, which includes its only N-glycosylation site, had exclusively truncated proximally fucosylated oligomannosidic glycans; Man3GlcNAc[Fuc(alpha 1-6)]GlcNAc or Man2GlcNAc[Fuc(alpha 1-6)]GlcNAc structures, in a ratio of 3:1, were detected in the secreted proteins. No evidence was obtained for the presence of secreted proteins with complex oligosaccharide chains, irrespective of the cell-culture conditions used or the harvesting time, for infected cells with recombinant baculovirus constructs.
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Affiliation(s)
- E Grabenhorst
- Department of Cell Biology and Genetics, Gesellschaft für Biotechnologische Forschung, Braunschweig, Germany
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111
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Abstract
Gangliosides of the 'GM1b-pathway' (GM1b and GalNAc-GM1b) have been found to be highly expressed by the mouse T lymphoma YAC-1 grown in serum-supplemented medium, whereas GM2 and GM1 ('GM1a-pathway') occurred only in low amounts [Müthing, J., Peter-Katalinić, J., Hanisch, F.-G., Neumann, U. (1991) Glycoconjugate J 8:414-23]. Considerable differences in the ganglioside composition of YAC-1 cells grown in serum-supplemented and in well defined serum-free medium were observed. After transfer of the cells from serum-supplemented medium (RPMI 1640 with 10% fetal calf serum) to serum-free medium (RPMI 1640 with well defined supplements), GM1b and GalNAc-GM1b decreased and only low amounts of these gangliosides could be detected in serum-free growing cells. The expression of GM1a was also diminished but not as strongly as that of GM1b and GalNAc-GM1b. These growth medium mediated ganglioside alterations were reversible, and the original ganglioside expression was achieved by readaptation of serum-free growing cells to the initial serum-supplemented medium. On the other hand, a 'new' ganglioside, supposed to represent GalNAc-GD1a and not expressed by serum-supplemented growing cells, was induced during serum-free cultivation, and increased strongly after readaptation. These observations reveal that the ganglioside composition of in vitro cultivated cells can be modified by the extracellular environment due to different supplementation of the basal growth medium.
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Affiliation(s)
- J Müthing
- Institut für Zellkulturtechnik, Technische Fakultät, Universität Bielefeld, Germany
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112
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Renneberg R, Trott-Kriegeskorte G, Lietz M, Jäger V, Pawlowa M, Kaiser G, Wollenberger U, Schubert F, Wagner R, Schmid RD. Enzyme sensor-FIA-system for on-line monitoring of glucose, lactate and glutamine in animal cell cultures. J Biotechnol 1991; 21:173-85. [PMID: 1367688 DOI: 10.1016/0168-1656(91)90269-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Enzyme sensors for glucose, lactate and glutamine were connected via flow-injection analysis (FIA) devices to two different bioprocesses. They were used for on-line process control of perfused bioreactor systems containing mammalian cell lines producing a monoclonal antibody and recombinant interleukin-2. The biosensor system gives direct access to important process data which can be used as control parameters for long term cell cultivation systems.
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Affiliation(s)
- R Renneberg
- Zentralinstitut für Molekularbiologie, Berlin-Buch, F.R.G
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113
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114
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Ryll T, Lucki-Lange M, Jäger V, Wagner R. Production of recombinant human interleukin-2 with BHK cells in a hollow fibre and a stirred tank reactor with protein-free medium. J Biotechnol 1990; 14:377-92. [PMID: 1366912 DOI: 10.1016/0168-1656(90)90120-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [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: 11/26/2022]
Abstract
For the production of recombinant human interleukin-2 (IL-2) two different culture processes, a 1-2 liter homogeneous stirred bubble-free aerated system and a dense cell hollow fibre bioreactor were compared. Cultivations were carried out with serum- or protein-free medium formulations. In the stirred culture 0.75 mg IL-2 were produced with 1 l of perfused medium at a maximum cell number of 3 X 10(10). The product yield in the hollow fibre module was only 0.23 mg l-1 at a maximum cell number of 6 X 10(10). In contrast to results with hybridoma or EBV-transformed cell lines, in which hollow fibre bioreactors showed comparable efficiency to perfused stirred tank reactors, the tissue-like cell density is disadvantageous as adherent cells tend to stick together leaving insufficient intercellular space for removal of product.
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Affiliation(s)
- T Ryll
- Gesellschaft für Biotechnologische Forschung, Arbeitsgruppe Zellkulturtechnik, Braunschweig, F.R.G
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115
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Eichner W, Jäger V, Herbst D, Hauser H, Hoppe J. Large-scale preparation of recombinant platelet-derived growth factor AA secreted from recombinant baby hamster kidney cells. Eur J Biochem 1989; 185:135-40. [PMID: 2806256 DOI: 10.1111/j.1432-1033.1989.tb15094.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The short isoform of platelet-derived growth factor A (PDGF-A) was expressed in a mammalian host (BHK-21 cell). A cell line was obtained that secreted up to 0.3 micrograms/10(6) cells recombinant PDGF-A chain homodimer/day into the medium. For large-scale production of supernatant, cells were grown either in roller bottles or in 2.5-1 stirred tank fermenters. A simple two-step procedure was developed to purify recombinant PDGF-AA (rPDGF-AA). The first step was adsorption onto porous glass and the final step was reversed-phase high-performance liquid chromatography. The yield was 0.2 mg/l supernatant. A total amount of 20-30 mg pure rPDGF-AA may be obtained from a single fermenter run. Sequence analysis showed the correct amino terminus and no internal proteolytic cleavages. The specific activity was 5 ng/ml for mouse AKR-2B cells. [125I]rPDGF-AA had an affinity constant of approximately 0.5 nM to these cells and 25,000 binding sites were estimated/cell.
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Affiliation(s)
- W Eichner
- Gesellschaft für Biotechnologische Forschung mbH, Braunschweig, Federal Republic of Germany
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116
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Günther HJ, Guntrum E, Jäger V. Berichtigung zu dem Beitrag Synthese von 4-Penten-4-oliden (γ-Methylen-γ-butyrolactonen) über 4-Pentensäuren. European J Org Chem 1988. [DOI: 10.1002/jlac.198819880412] [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: 11/06/2022]
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117
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Gürtler LG, Jäger V, Gruber W, Hillmar I, Schobloch R, Müller PK, Ziegelmayer G. Presence of proteins in human bones 200, 1200 and 1500 years of age. Hum Biol 1981; 53:137-50. [PMID: 7016716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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118
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Gasparová J, Jäger V, Andrik P. [Various stomatological findings in native Zambian children]. Cesk Stomatol 1979; 79:24-8. [PMID: 284848] [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: 12/14/2022]
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119
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120
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Jäger V, Buß V, Schwab W. Syntheses via isoxazolines III. Diastereoselective synthesis of γ-amino-alcohols with 2 and 3 chiral centres. Tetrahedron Lett 1978. [DOI: 10.1016/s0040-4039(01)94963-9] [Citation(s) in RCA: 52] [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: 10/17/2022]
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121
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Günther H, Jäger V, Skell P. Reaction of iodine with non-conjugated dienes; iodocyclization promoted by a remarkable gem-dialkyl effect. Tetrahedron Lett 1977. [DOI: 10.1016/s0040-4039(01)83814-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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122
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123
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Bernt O, Jäger V. [Treatment of gastrointestinal hemorrhages in a small hospital]. Zentralbl Chir 1970; 95:318-24. [PMID: 5314767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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124
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Viehe HG, Jäger V, Compernolle F. 3-Nitro-2-azachromone(4H-1,2-Benzoxazin-4-one): Structure of the Presumedp-Nitrophenylnitroacetylene. Angew Chem Int Ed Engl 1969. [DOI: 10.1002/anie.196909791] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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125
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Viehe HG, Jäger V, Compernolle F. 3-Nitro-2-azachromon (4H-1,2-Benzoxazin-4-on): Struktur des vermeintlichenp-Nitrophenyl-nitro-acetylens. Angew Chem Int Ed Engl 1969. [DOI: 10.1002/ange.19690812311] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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126
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