Cytotoxin-based biological containment
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United States of America Patent
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Feb 27, 2007
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app pub date -
May 7, 1999
filing date -
May 7, 1998
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Abstract
Method of conditionally controlling the survivability of a recombinant cell population and of containing such cells to an environment or containing replicons to a host cell is based on the use of proteic killer systems including the E. coli relBE locus and similar systems found in Gram-negative and Gram-positive bacteria and Archae. Such system are generally based on a cytotoxin polypeptide and an antitoxin or antidote polypeptide that in contrast to the cytotoxin is degradable by proteases. The recombinant cells are useful as vaccines, pollulant degrading organisms or as biogical pest control organisms e.g. expressing B. thuringiensis crystalline proteins.
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