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- W1848901502 abstract "The genetic determinant for the K99 adhesin of enterotoxigenic Escherichia coli B41 [O101:K99] has been cloned as a 7.0-kilobase BamHI-generated DNA fragment into the vector pBR322 by us and others (J. D. A. van Embden, F. K. de Graaf, L. M. Schouls, and J. S. Teppma, Infect. Immun. 29:1125-1133, 1980). Cells harboring one such construction, known as pK99-64, are capable of expressing K99 antigen on the cell surface. We replaced the natural promoter sequence for the gene encoding the K99 pilus subunit with a strong, inducible exogenous promoter, the E. coli tryptophan (trp) operon promoter, to construct the plasmid pBR-TrpK99. E. coli cells harboring pBR-TrpK99 or a similar construction in the plasmid pDR540, known as pKO-TrpK99, upon induction with 3-beta-indoleacrylic acid, produced about fourfold more K99 antigen than did cells bearing pK99-64 with the natural promoter. Expression of the pilus antigen was found to be under control of the tryptophan promoter. Plasmid instability was encountered, however, in cells bearing pKO-TrpK99 when the trp promoter was derepressed. Introduction of the aminoglycoside 3'-phosphotransferase gene of transposable element Tn5 into pKO-TrpK99 to generate pKON-TrpK99 effectively stabilized the plasmid in cells grown under identical conditions in medium containing kanamycin." @default.
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- W1848901502 date "1988-09-01" @default.
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- W1848901502 title "Expression of K99 adhesion antigen controlled by the Escherichia coli tryptophan operon promoter" @default.
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- W1848901502 doi "https://doi.org/10.1128/iai.56.9.2317-2323.1988" @default.
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