SprB is a Cell-Surface Component of the Flavobacterium johnsoniae Gliding Motility Machinery

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

^* To whom correspondence should be addressed. Email: mcbride{at}uwm.edu.

	Abstract

Cells of the gliding bacterium Flavobacterium johnsoniae move rapidly over surfaces by an unknown mechanism. Transposon insertions in sprB resulted in cells that were defective in gliding. SprB is a highly repetitive 669 kDa cell-surface protein and antibodies against SprB inhibited motility of wild-type cells. Polystyrene microspheres coated with antibodies against SprB attached to and were rapidly propelled along the cell surface suggesting that SprB is one of the outermost components of the motility machinery. The movement of SprB along the cell surface supports a model of gliding motility in which motors anchored to the cell wall rapidly propel cell surface adhesins.