Gene sequences and comparison of the fimbrial subunits representative of Bacteroides nodosus serotypes A to I: class I and class II strains

Molecular Microbiology
J S MattickJ R Egerton


We have determined the nucleotide sequences of the genes encoding the fimbrial subunits representative of the known Bacteroides nodosus serogroups. All of the genes are preceded by a highly conserved region which includes the likely promoter and transcriptional regulator sites as well as the ribosome-biding site, and are followed within a short but variable distance by a sequence with the characteristics of a transcription termination or attenuation signal. Based on sequence and organization, the subunits can be divided into two major classes called I (serogroups A, B, C, E, F, G, and I) and II (serogroups D and H). All contain the same seven-amino-acid positively charged leader sequence and conserved hydrophobic amino-terminal sequence typical of type 4 fibriae. Beyond this point the class II subunits are quite different from class I and share features more in common with those from other type 4 fimbriate bacteria, such as Moraxella bovis and Pseudomonas aeruginosa. The larger class I may be further subdivided into two subsets: (i) [A, E, F)(B, I)) and (ii) (C, G). These proteins exhibit three major clusters of variation, at either end of the presumptive disulphide loop which spans the central third of the protein, and near th...Continue Reading


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