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Skalenubergreifende Produktion und Sekretion rekombinanter Proteine mit Stammen der Gattung Bacillus

Skalenubergreifende Produktion und Sekretion rekombinanter Proteine mit Stammen der Gattung Bacillus

          
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About the Book

Biopharmazeutika wie Antikorper und Hormone reprasentieren etwa ein Funftel der kommerziellen Pharmazeutika. Fur die rekombinante Produktion dieser Proteine sind diverse Stamme der Gattung Bacillus vielversprechende alternative Kandidaten. Sie sind einfach zu kultivieren, apathogen und sekretieren korrekt gefaltete Proteine mit hoher Effizienz. Einige der anspruchsvollsten heterologen Proteine sind Antikorper und ihre Fragmente sowie große multimere Enzyme wie die Penicillin-G-Acylase (Pac). Antikorperfragmente werden aufgrund ihrer hoch-spezifischen Antigen-Bindung vielfach therapeutisch, diagnostisch und analytisch eingesetzt, wobei single-chain fragment variable (scFv) das kleinste herkommliche Format darstellt. Pac wird fur die Herstellung semisynthetischer β-Lactam-Antibiotika benotigt. Gegenstand dieser Arbeit ist die skalenubergreifende rekombinante Produktion und Sekretion des Antikorperfragments D1.3 scFv und der Pac mit B. megaterium, B. licheniformis sowie mit B. subtilis-Stammen unterschiedlicher Protease-Aktivitat. Die Produktion, Sekretion und Reinigung des D1.3 scFv wurde durch ein Plasmid ermoglicht, das einen Xylose-induzierbaren, fur B. megaterium optimierten, Promotor und Sequenzen fur das Signalpeptid SPlipA und einen fusionierten His6-Tag aufweist. Die Sekretion von funktionalem D1.3 scFv wurde fur B. megaterium MS941, B. licheniformis MW3 sowie B. subtilis 168, DB431 und WB800N in einem angepassten Minimalmedium gezeigt. Skalenubergreifend erfolgte die Produktion in Mikrotiterplatten (1,25 mL), Schuttelkolben (150 mL) und Ruhrkesselreaktoren (2.000 mL). Es wurden extrazellulare Konzentrationen von 15 130 mg L 1 erzielt. Fur B. subtilis stiegen Menge und Stabilitat des D1.3 scFv, je geringer die Protease-Aktivitat des Stammes war. Fur die rekombinante Produktion der Pac wurden ebenfalls Xylose-induzierbare Plasmide konstruiert. Die Sekretion konnte fur B. megaterium MS941 und ATCC14945 sowie fur B. subtilis 168 und WB800N im Schuttelkolben (150 mL) gezeigt werden. Die maximalen extrazellularen Aktivitaten betrugen 0,3 0,65 U mL 1, wobei die Protease-Defizienz in MS941 bzw. WB800N auch hier eine Aktivitatszunahme bewirkte. Ein fusionierter C terminaler His6-Tag wirkte sich negativ auf die Pac-Aktivitat aus. Das hohe Potenzial von Stammen der Gattung Bacillus fur die rekombinante Produktion von pharmazeutisch relevanten anspruchsvollen Proteinen wie Antikorperfragmenten und großen multimeren Enzymen konnte skalenubergreifend von 1,25 bis 2.000 mL Kulturvolumen demonstriert werden. Mit 130 mg L 1 wurden die bisher hochsten extrazellularen Konzentrationen eines Antikorperfragments fur ein Gram-positives Bakterium erreicht. Auch wurde die artubergreifende Anwendung der hier konstruierten, fur B. megaterium optimierten, Plasmide demonstriert.


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Product Details
  • ISBN-13: 9783736995765
  • Binding: Paperback
  • Language: German
  • Width: 190 mm
  • ISBN-10: 3736995768
  • Height: 210 mm
  • Weight: 8 gr

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