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Journal of Bacteriology, January 1999, p. 521-530, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Septal Localization of FtsQ, an Essential Cell Division Protein in Escherichia coli

Joseph C. Chen, David S. Weiss,dagger Jean-Marc Ghigo,Dagger and Jon Beckwith*

Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115

Received 13 August 1998/Accepted 27 October 1998

Septation in Escherichia coli requires several gene products. One of these, FtsQ, is a simple bitopic membrane protein with a short cytoplasmic N terminus, a membrane-spanning segment, and a periplasmic domain. We have constructed a merodiploid strain that expresses both FtsQ and the fusion protein green fluorescent protein (GFP)-FtsQ from single-copy chromosomal genes. The gfp-ftsQ gene complements a null mutation in ftsQ. Fluorescence microscopy revealed that GFP-FtsQ localizes to the division site. Replacing the cytoplasmic and transmembrane domains of FtsQ with alternative membrane anchors did not prevent the localization of the GFP fusion protein, while replacing the periplasmic domain did, suggesting that the periplasmic domain is necessary and sufficient for septal targeting. GFP-FtsQ localization to the septum depended on the cell division proteins FtsZ and FtsA, which are cytoplasmic, but not on FtsL and FtsI, which are bitopic membrane proteins with comparatively large periplasmic domains. In addition, the septal localization of ZipA apparently did not require functional FtsQ. Our results indicate that FtsQ is an intermediate recruit to the division site.

* Corresponding author. Mailing address: Department of Microbiology and Molecular Genetics, Harvard Medical School, 200 Longwood Ave., Boston, MA 02115. Phone: (617) 432-1920. Fax: (617) 738-7664. E-mail: jbeckwit{at}warren.med.harvard.edu.

dagger Present address: Department of Microbiology, University of Iowa, Iowa City, IA 52242.

Dagger Present address: Unité de Physiologie Cellulaire Institut Pasteur (CNRS URA 1300), 75724 Paris Cedex 15, France.

Journal of Bacteriology, January 1999, p. 521-530, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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