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- W1560783131 abstract "Nontoxic analogs of pertussis toxin (PT), produced by in vitro mutagenesis of the tox operon, are immunogenic and protective against infection by Bordetella pertussis. The moderate levels of PT production by B. pertussis, however, make it the limiting antigen in the formulation of multicomponent, acellular, recombinant whooping cough vaccines. To increase production of the highly detoxified Lys9Gly129 PT analog by B. pertussis, additional copies of the mutated tox operon were integrated into the bacterial chromosome at the tox or fha locus by unmarked allelic exchange. Recombinant strains produced in this way secreted elevated levels of the PT analog proportional to gene dosage. The strains were stable during 10-liter fermentations, and yields of up to 80 mg of PT analog per liter were obtained under production-scale conditions. The nontoxic analog was purified and shown to be indistinguishable from material obtained from a B. pertussis strain that contained only a single copy of the toxLys9Gly129 operon. Such strains are therefore suitable for large-scale, industrial production of an acellular whooping cough vaccine containing a genetically detoxified PT analog." @default.
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- W1560783131 date "1992-01-01" @default.
- W1560783131 modified "2023-09-27" @default.
- W1560783131 title "Construction of Bordetella pertussis strains that overproduce genetically inactivated pertussis toxin" @default.
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- W1560783131 doi "https://doi.org/10.1128/aem.58.1.208-214.1992" @default.
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