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Helical tubes of FtsZ from Methanococcus jannaschii
Biological Chemistry
|November 15, 2000
Summary
Bacterial tubulin homologue FtsZ forms helical tubes and sheets in vitro. These structures, assembled using GMPCPP or Ca++, resemble bacterial Z-ring components and may play a role in cell division.
Area of Science:
- Microbiology
- Structural Biology
- Biochemistry
Background:
- Bacterial cell division relies on the Z-ring, formed by FtsZ, a homologue of eukaryotic tubulin.
- FtsZ polymerizes into various forms in vitro, suggesting a structural function in the bacterial septum.
Purpose of the Study:
- To investigate the in vitro assembly of M. jannaschii FtsZ1 protein into ordered polymers.
- To characterize the structural properties of FtsZ polymers formed using the GTP analogue GMPCPP.
Main Methods:
- Recombinant FtsZ1 protein from M. jannaschii was used for in vitro polymerization.
- Polymerization was induced using the GTP analogue GMPCPP or Ca++.
- Structural characteristics of the assembled helical tubes and sheets were analyzed.
Main Results:
- High yields of helical tubes and sheets were produced using GMPCPP.
- GMPCPP-induced sheets resemble previously reported Ca++-induced sheets, composed of two parallel protofilaments.
- Assembled tubes, hollow or filled, exhibit helical structures with distinct pitches compared to microtubules.
Conclusions:
- FtsZ assembles into well-ordered helical polymers in vitro, mimicking potential in vivo structures.
- The observed polymer dimensions and stability suggest a role in bacterial cell division and potential use in motility assays.