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Infection and Immunity, September 2003, p. 4977-4984, Vol. 71, No. 9
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.9.4977-4984.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

The Hag Protein of Moraxella catarrhalis Strain O35E Is Associated with Adherence to Human Lung and Middle Ear Cells

Melissa M. Holm, Serena L. Vanlerberg, Darren D. Sledjeski, and Eric R. Lafontaine*

Department of Microbiology and Immunology, Medical College of Ohio, Toledo, Ohio 43614-5806

Received 20 June 2003/ Accepted 25 June 2003

Previous studies have demonstrated that the Moraxella catarrhalis surface antigen UspA1 is an adhesin for Chang human conjunctival cells. The present report demonstrates that lack of UspA1 expression does not affect the adherence of strain O35E to A549 human lung cells or primary cultures of human middle ear epithelial (HMEE) cells. These results imply that another molecule mediates the adherence of M. catarrhalis to these two cell lines. To identify this adhesin, strain O35E was mutagenized with a transposon and 1,000 mutants were screened in a microcolony formation assay using A549 cells. Nine independent isolates exhibited an 8- to 19-fold reduction in adherence and contained a transposon in the same locus. Nucleotide sequence data and PCR analysis indicated that the transposons were inserted in different locations in the gene encoding the surface protein Hag. Quantitative assays using one representative transposon mutant, O35E.TN2, showed considerably decreased binding to A549 as well as HMEE cells. However, this mutant adhered at wild-type levels to Chang conjunctival cells. These findings suggest that the M. catarrhalis Hag protein is an adhesin for cell lines derived from human lung and middle ear tissues.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Medical College of Ohio, Health Education Building, 3055 Arlington Ave., Toledo, OH 43614-5806. Phone: (419) 383-6626. Fax: (419) 383-3002. E-mail: elafontaine{at}mco.edu.

Editor: D. L. Burns

Infection and Immunity, September 2003, p. 4977-4984, Vol. 71, No. 9
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.9.4977-4984.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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