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Journal of Bacteriology, October 2005, p. 6943-6952, Vol. 187, No. 20
0021-9193/05/$08.00+0     doi:10.1128/JB.187.20.6943-6952.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Flavobacterium johnsoniae Gliding Motility Genes Identified by mariner Mutagenesis

Timothy F. Braun, Manjeet K. Khubbar, Daad A. Saffarini, and Mark J. McBride*

Department of Biological Sciences, University of Wisconsin—Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201

Received 2 June 2005/ Accepted 27 July 2005

Cells of Flavobacterium johnsoniae glide rapidly over surfaces. The mechanism of F. johnsoniae gliding motility is not known. Eight gld genes required for gliding motility have been described. Disruption of any of these genes results in complete loss of gliding motility, deficiency in chitin utilization, and resistance to bacteriophages that infect wild-type cells. Two modified mariner transposons, HimarEm1 and HimarEm2, were constructed to allow the identification of additional motility genes. HimarEm1 and HimarEm2 each transposed in F. johnsoniae, and nonmotile mutants were identified and analyzed. Four novel motility genes, gldK, gldL, gldM, and gldN, were identified. GldK is similar in sequence to the lipoprotein GldJ, which is required for gliding. GldL, GldM, and GldN are not similar in sequence to proteins of known function. Cells with mutations in gldK, gldL, gldM, and gldN were defective in motility and chitin utilization and were resistant to bacteriophages that infect wild-type cells. Introduction of gldA, gldB, gldD, gldFG, gldH, gldI, and gldJ and the region spanning gldK, gldL, gldM, and gldN individually into 50 spontaneous and chemically induced nonmotile mutants restored motility to each of them, suggesting that few additional F. johnsoniae gld genes remain to be identified.

* Corresponding author. Mailing address: Department of Biological Sciences, 181 Lapham Hall, University of Wisconsin—Milwaukee, 3209 N. Maryland Ave., Milwaukee, WI 53211. Phone: (414) 229-5844. Fax: (414) 229-3926. E-mail: mcbride{at}uwm.edu.

Journal of Bacteriology, October 2005, p. 6943-6952, Vol. 187, No. 20
0021-9193/05/$08.00+0     doi:10.1128/JB.187.20.6943-6952.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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