Cell division in a minimal bacterium in the absence of ftsZ

Maria Lluch-Senar (1) , Enrique Querol (1) , Jaume Piñol (2)

1 Bioquímica i Biologia Molecular
2 Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular

Mycoplasma genomes exhibit an impressive low amount of genes involved in cell division and some species even lack the ftsZ gene, which is found widespread in the microbial world and is considered essential for cell division by binary fission. We constructed a Mycoplasma genitalium ftsZ null mutant by gene replacement to investigate the role of this gene and the presence of alternative cell division mechanisms in this minimal bacterium. Our results demonstrate that ftsZ is non-essential for cell growth and reveal that, in the absence of the FtsZ protein, M. genitalium can manage feasible cell divisions and cytokinesis using the force generated by its motile machinery. This is an alternative mechanism, completely independent of the FtsZ protein, to perform cell division by binary fission in a microorganism. We also propose that the mycoplasma cytoskeleton, a complex network of proteins involved in many aspects of the biology of these microorganisms, may have undertaken the function of many genes involved in cell division, allowing their loss in the regressive evolution of the streamlined mycoplasma genomes.

Mots clés: Life Sciences

Maria Lluch-Senar, Enrique Querol, Jaume Piñol. Cell division in a minimal bacterium in the absence of ftsZ. Molecular Microbiology, 2010, 78 (2), pp.278. ⟨10.1111/j.1365-2958.2010.07306.x⟩. ⟨hal-00566758⟩