Summary
The genes responsible for the formation of the F72 fimbriae of the uropathogenic E. coli strain AD110 (O6:K2:H1:F7) have been cloned on the recombinant plasmid pPIL110-35 (Van Die et al. 1983). The F72 fimbriae, like the F71 fimbriae of AD110, are responsible for mannose resistant haemagglutination (MRHA).
The molecular organisation of the genes of pPIL110-35 involved in the expression of MRHA was studied by: (a) analysis of transposon γδ and Tn5 insertion mutants. Mutations that cause an MRHA-deficient phenotype were located in discrete groups within an 11.5 kb restriction fragment of pPIL110-35, separated by insertion mutations that do not inactivate MRHA. (b) complementation experiments. Restriction fragments of pPIL110-35 subcloned in the vector pBR322 were tested for their ability to complement transposon insertion mutations in the corresponding regions of pPIL110-35. Five complementation groups were distinguished.
Five genes (designated A-E) involved in the expression of MRHA can be distinguished by these results. The products of these genes were analysed in minicells. The results indicate that gene B codes for a 75 K dalton protein, gene C for a 23 K dalton protein and gene E for a 36 K dalton protein. No product of gene D was observed. Gene A probably codes for the 17 K dalton subunit polypeptide of the F72 fimbriae, as will be discussed.
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van Die, I., van Megen, I., Hoekstra, W. et al. Molecular organisation of the genes involved in the production of F72 fimbriae, causing mannose resistant haemagglutination, of a uropathogenic Escherichia coli 06:K2:H1:F7 strain. Molec. Gen. Genet. 194, 528–533 (1984). https://doi.org/10.1007/BF00425570
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DOI: https://doi.org/10.1007/BF00425570