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J Bacteriol, June 1998, p. 3209-3217, Vol. 180, No. 12
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Cloning and Comparison of fliC Genes and Identification of Glycosylation in the Flagellin of Pseudomonas aeruginosa a-Type Strains

Cynthia D. Brimer and T. C. Montie*

Department of Microbiology, The University of Tennessee, Knoxville, Tennessee

Received 20 October 1997/Accepted 7 April 1998

Pseudomonas aeruginosa a-type strains produce flagellin proteins which vary in molecular weight between strains. To compare the properties of a-type flagellins, the flagellin genes of several Pseudomonas aeruginosa a-type strains, as determined by interaction with specific anti-a monoclonal antibody, were cloned and sequenced. PCR amplification of the a-type flagellin gene fragments from five strains each yielded a 1.02-kb product, indicating that the gene size is not likely to be responsible for the observed molecular weight differences among the a-type strains. The flagellin amino acid sequences of several a-type strains (170018, 5933, 5939, and PAK) were compared, and that of 170018 was compared with that of PAO1, a b-type strain. The former comparisons revealed that a-type strains are similar in amino acid sequence, while the latter comparison revealed differences between 170018 and PAO1. Posttranslational modification was explored for its contribution to the observed differences in molecular weight among the a-type strains. A biotin-hydrazide glycosylation assay was performed on the flagellins of three a-type strains (170018, 5933, and 5939) and one b-type strain (M2), revealing a positive glycosylation reaction for strains 5933 and 5939 and a negative reaction for 170018 and M2. Deglycosylation of the flagellin proteins with trifluoromethanesulfonic acid (TFMS) confirmed the glycosylation results. A molecular weight shift was observed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis for the TFMS-treated flagellins of 5933 and 5939. These results indicate that the molecular weight discrepancies observed for the a-type flagellins can be attributed, at least in part, to glycosylation of the protein. Anti-a flagellin monoclonal antibody reacted with the TFMS-treated flagellins, suggesting that the glycosyl groups are not a necessary component of the epitope for the human anti-a monoclonal antibody. Comparisons between a-type sequences and a b-type sequence (PAO1) will aid in delineation of the epitope for this monoclonal antibody.

* Corresponding author. Mailing address: Department of Microbiology, The University of Tennessee, Knoxville, TN 37996-0845. Phone: (423) 974-4047. Fax: (423) 974-4007. E-mail: tmontie{at}utk.edu.

J Bacteriol, June 1998, p. 3209-3217, Vol. 180, No. 12
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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