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Journal of Bacteriology, January 1999, p. 508-520, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Localization of FtsI (PBP3) to the Septal Ring
Requires Its Membrane Anchor, the Z Ring, FtsA, FtsQ, and
FtsL
David S.
Weiss,*
Joseph C.
Chen,
Jean-Marc
Ghigo,
Dana
Boyd, and
Jon
Beckwith
Department of Microbiology, Harvard Medical
School, Boston, Massachusetts 02115
Received 3 August 1998/Accepted 4 November 1998
Assembly of the division septum in bacteria is mediated by several
proteins that localize to the division site. One of these, FtsI (also
called penicillin-binding protein 3) of Escherichia coli,
consists of a short cytoplasmic domain, a single membrane-spanning segment, and a large periplasmic domain that encodes a transpeptidase activity involved in synthesis of septal peptidoglycan. We have constructed a merodiploid strain with a wild-type copy of
ftsI at the normal chromosomal locus and a genetic fusion
of ftsI to the green fluorescent protein (gfp)
at the lambda attachment site. gfp-ftsI was expressed at
physiologically appropriate levels under control of a regulatable
promoter. Consistent with previous results based on immunofluorescence
microscopy GFP-FtsI localized to the division site during the later
stages of cell growth and throughout septation. Localization of
GFP-FtsI to the cell pole(s) was not observed unless the protein was
overproduced about 10-fold. Membrane anchor alterations shown
previously to impair division but not membrane insertion or
transpeptidase activity were found to interfere with localization of
GFP-FtsI to the division site. In contrast, GFP-FtsI localized well in
the presence of
-lactam antibiotics that inhibit the transpeptidase
activity of FtsI. Septal localization depended upon every other
division protein tested (FtsZ, FtsA, FtsQ, and FtsL). We conclude that
FtsI is a late recruit to the division site, and that its localization
depends on an intact membrane anchor.
*
Corresponding author. Present address: Department of
Microbiology, University of Iowa, 3403 Bowen Science Building, Iowa
City, IA 52242. Phone: (319) 335-7785. Fax: (319) 335-7949. E-mail: david-weiss{at}uiowa.edu.

Present address: Unité de Physiologie Cellulaire Institut
Pasteur (CNRS URA 1300), 75724 Paris Cedex 15,
France.
Journal of Bacteriology, January 1999, p. 508-520, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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