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Journal of Bacteriology, July 2000, p. 3870-3873, Vol. 182, No. 13
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The FtsH Protein Accumulates at the Septum of Bacillus subtilis during Cell Division and Sporulation

Wolfgang Wehrl,1 Michael Niederweis,2 and Wolfgang Schumann1,*

Institute of Genetics, University of Bayreuth, D-95440 Bayreuth,1 and Lehrstuhl fuer Mikrobiologie, University of Erlangen, D-91058 Erlangen,2 Germany

Received 6 January 2000/Accepted 6 April 2000

The ftsH gene encodes an ATP- and Zn2+-dependent metalloprotease which is anchored to the cytoplasmic membrane via two transmembrane segments in such a way that the very short amino- and the long carboxy termini are exposed to the cytoplasm. Deletion of the ftsH gene in Bacillus subtilis results in a pleiotropic phenotype such as filamentous growth. This observation prompted us to ask whether ftsH is involved in cell division. A translational fusion was constructed between the complete coding region of ftsH and gfp+ the latter carrying five point mutations to obtain enhanced fluorescence. We detected that the FtsH protein accumulates in the midcell septum of dividing cells, and during sporulation first in the asymmetrically located septa of sporulating cells and later in the membrane which engulfs the forespore. These observations revealed a new function of FtsH.

* Corresponding author. Mailing address: Institute of Genetics, University of Bayreuth, D-95440 Bayreuth, Germany. Phone: (921) 552708. Fax: (921) 552710. E-mail: wolfgang.schumann{at}uni-bayreuth.de.

Journal of Bacteriology, July 2000, p. 3870-3873, Vol. 182, No. 13
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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