Identification of a novel Haemophilus influenzae protein important for adhesion to epithelial cells.
Författare
Summary, in English
Non-typable Haemophilus influenzae (NTHi) is an important human-specific respiratory pathogen colonizing the mucosa of the upper respiratory tract. The bacterium is a common cause of acute otitis media in children and exacerbations in patients with chronic obstructive pulmonary disease (COPD). An immunoglobulin (Ig) D-lambda myeloma protein was found to detect a 16kDa surface protein that we designated protein E (PE). The pe gene was cloned using an NTHi genomic DNA library, and a truncated PE-derived protein lacking the endogenous signal peptide (PE22-160) was synthesized and produced in large amounts in Escherichia coli. Interestingly, PE was expressed at the bacterial surface of NTHi as revealed by flow cytometry using the IgD-lambda myeloma protein or PE-specific polyclonal antibodies. A PE-deficient NTHi mutant was produced and lost 50% of its adhesive capacity as compared to the wild-type counterpart when analysed for adhesion to type II lung alveolar epithelial cells. In parallel, E. coli expressing full-length PE1-160 adhered significantly more efficiently to epithelial cells as compared to wild-type E. coli. Recombinant IgD that recognized the chemical dansyl-chloride did not interact with PE indicating that the IgD-lambda myeloma protein most likely was an antibody directed against the H. influenzae surface epitope. In conclusion, we have discovered a novel NTHi outer membrane protein with adhesive properties using an IgD-myeloma protein.
Avdelning/ar
Publiceringsår
2008
Språk
Engelska
Sidor
87-96
Publikation/Tidskrift/Serie
Microbes and Infection
Volym
10
Issue
1
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Infectious Medicine
Status
Published
Forskningsgrupp
- Clinical Microbiology, Malmö
ISBN/ISSN/Övrigt
- ISSN: 1769-714X