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J. Bacteriol., Jul 1997, 4277-4284, Vol 179, No. 13
Copyright © 1997, American Society for Microbiology

Temperature shift experiments with an ftsZ84(Ts) strain reveal rapid dynamics of FtsZ localization and indicate that the Z ring is required throughout septation and cannot reoccupy division sites once constriction has initiated

SG Addinall, C Cao and J Lutkenhaus
Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City 66160, USA.

FtsZ is an essential division protein in bacteria that functions by forming a ring at midcell that mediates septation. To further study the function of the Z ring the effect of a temperature-sensitive mutation, ftsZ84(Ts), on ring dynamics and septal progression was examined. Shifting a strain carrying an ftsZ84(Ts) mutation to the nonpermissive temperature led to loss of Z rings within 1 min. Septal ingrowth was immediately inhibited, and sharply demarcated septa, present at the time of the shift, were gradually replaced by blunted septa. These results indicate that the Z ring is required throughout septation. Shifting filaments to permissive temperature led to a rapid localization of FtsZ84 at regular intervals. Included in these localization events were complete and partial rings as well as spots, although some of these eventually aborted. These results reveal the rapid dynamics of FtsZ localization and indicate that nucleation sites are formed in the absence of FtsZ function. Interestingly, Z rings could not reform at division sites that were constricted although they could reform at sites that had not begun constriction.


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