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. 1994 Nov;62(11):4922–4928. doi: 10.1128/iai.62.11.4922-4928.1994

Identification of hifD and hifE in the pilus gene cluster of Haemophilus influenzae type b strain Eagan.

K W McCrea 1, W J Watson 1, J R Gilsdorf 1, C F Marrs 1
PMCID: PMC303208  PMID: 7927773

Abstract

Haemophilus influenzae produces surface structures called pili that promote adherence to human cells. Three genes encoding the major pilus structural component (pilin), chaperone, and usher proteins (designated hifA, -B, and -C, respectively) have been identified previously. In this study, transposon mutagenesis and DNA sequence analysis identified two open reading frames (ORFs) downstream of, and in the same orientation as, hifC. These genes have been designated hifD and hifE. Both genes have predicted C-terminal amino acid homology to HifA, and mutations in either gene resulted in the loss of morphologic and functional pili, indicating that hifD and hifE encode pilus structural components and are required for pilus expression. Another ORF, identified immediately downstream of hifE, has a predicted amino acid sequence that is 70% identical to an aminopeptidase of Escherichia coli called PepN, and a mutation within this ORF did not alter pilus expression. These data indicate that the pepN homolog is not required for pilus biogenesis and that one end of the pilus gene cluster has been defined.

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Selected References

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