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Flagellar Motility and Structure in the Hyperthermoacidophilic Archaeon Sulfolobus solfataricus

Zalán Szabó,^1, Musa Sani,² Maarten Groeneveld,^1, Benham Zolghadr,¹ James Schelert,³ Sonja-Verena Albers,¹ Paul Blum,³ Egbert J. Boekema,² and Arnold J. M. Driessen^1*

Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands,¹ Department of Biophysical Chemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands,² Beadle Center for Genetics, University of Nebraska, Lincoln, Nebraska 68588-0666³

Received 9 January 2007/ Accepted 25 March 2007

Flagellation in archaea is widespread and is involved in swimming motility. Here, we demonstrate that the structural flagellin gene from the crenarchaeaon Sulfolobus solfataricus is highly expressed in stationary-phase-grown cells and under unfavorable nutritional conditions. A mutant in a flagellar auxiliary gene, flaJ, was found to be nonmotile. Electron microscopic imaging of the flagellum indicates that the filaments are composed of right-handed helices.

Published ahead of print on 6 April 2007.

Present address: Institute of Enzymology, Hungarian Academy of Sciences, Karolina út 29, 1113 Budapest, Hungary.

Present address: Department of Biochemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.