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Journal of Bacteriology, February 1999, p. 823-832, Vol. 181, No. 3
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Analysis of FtsZ Assembly by Light Scattering and Determination of the Role of Divalent Metal Cations

Amit Mukherjee and Joe Lutkenhaus*

Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, Kansas 66160

Received 7 July 1998/Accepted 17 November 1998

FtsZ is an ancestral homologue of tubulin that polymerizes in a GTP-dependent manner. In this study, we used 90° angle light scattering to investigate FtsZ polymerization. The critical concentration for polymerization obtained by this method is similar to that obtained by centrifugation, confirming that the light scattering is proportional to polymer mass. Furthermore, the dynamics of FtsZ polymerization could be readily monitored by light scattering. Polymerization was very rapid, reaching steady state within 30 s. The length of the steady-state phase was proportional to the GTP concentration and was followed by a rapid decrease in light scattering. This decrease indicated net depolymerization that always occurred as the GTP in the reaction was consumed. FtsZ polymerization was observed over the pH range 6.5 to 7.9. Importantly, Mg2+ was not required for polymerization although it was required for the dynamic behavior of the polymers. It was reported that 7 to 25 mM Ca2+ mediated dynamic assembly of FtsZ (X.-C. Yu and W. Margolin, EMBO J. 16:5455-5463, 1997). However, we found that Ca2+ was not required for FtsZ assembly and that this concentration of Ca2+ reduced the dynamic behavior of FtsZ assembly.

* Corresponding author. Mailing address: Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, KS 66160. Phone: (913) 588-7054. Fax: (913) 588-7295. E-mail: jlutkenh{at}kumc.edu.

Journal of Bacteriology, February 1999, p. 823-832, Vol. 181, No. 3
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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