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• W1900544446 abstract "We have cloned the Bacteroides fragilis TAL2480 neuraminidase (NANase) structural gene, nanH, in Escherichia coli. This was accomplished by using the cloning shuttle vector pJST61 and a partial Sau3A library of TAL2480 chromosomal inserts created in E. coli. The library was mobilized into the NANase-deficient B. fragilis TM4000 derivative TC2. NANase-producing colonies were enriched by taking advantage of the inability of TC2, but not the wild-type of NANase+ revertant, to grow in vitro in fluid aspirated from the rat granuloma pouch. Plasmids pJST61-TCN1 and pJST61-TCN3, containing inserts of 9.1 and 4.5 kilobases (kb), respectively, were found in the TC2 derivatives that grew in the rat pouch medium. In B. fragilis, NANase production from the two plasmids was inducible by free N-acetylneuraminic acid or sialic acid-containing substrates, just as in the parental TAL2480 strain. However, when these plasmids were transferred back to E. coli, NANase activity was barely detectable. A 3.5-kb portion of the insert in pJST61-TCN3 was subcloned in pJST61 to give plasmid pJST61-SC3C; NANase was produced from this plasmid both in E. coli and in B. fragilis. In E. coli, NANase expression was under the control of the vector promoter lambda pR and was therefore completely abolished by the presence of a lambda prophage. In B. fragilis, NANase production was inducible by free N-acetylneuraminic acid or sialic acid-containing substrates. By using deletion analysis and Tn1000 mutagenesis, the NANase structural gene and control region that functions in B. fragilis were localized to a 1.5- to 2.0-kb region of the insert. A partial nucleotide sequence of the NANase-deficient Tn1000 insertion mutants allowed us to identify the nanH gene and deduce the amino acid sequence of a portion of the NANase protein. We identified five regions showing great similarity to the Asp boxes, -Ser-X-Asp-X-Gly-X-Thr-Trp-, of other bacterial and viral NANase proteins." @default.
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• W1900544446 date "1990-05-01" @default.
• W1900544446 modified "2023-10-02" @default.
• W1900544446 title "Cloning and expression of the Bacteroides fragilis TAL2480 neuraminidase gene, nanH, in Escherichia coli" @default.
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• W1900544446 doi "https://doi.org/10.1128/jb.172.5.2594-2600.1990" @default.
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