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Most bacteria divide by binary fission using an FtsZ-based mechanism that relies on a multi-protein complex, the divisome. In the majority of non-spherical bacteria another multi-protein complex, the elongasome, is also required for the maintenance of cell shape. Components of these multi-protein assemblies are conserved and essential in most bacteria. Here, we provide evidence that at least three proteins of these two complexes are not essential in the FtsZ-less ovoid planctomycete bacterium  Planctopirus limnophila  which divides by budding. We attempted to construct  P. limnophila  knock-out mutants of the genes coding for the divisome proteins FtsI, FtsK, FtsW and the elongasome protein MreB. Surprisingly,  ftsI ,  ftsW  and  mreB  could be deleted without affecting the growth rate. On the other hand, the conserved  ftsK  appeared to be essential in this bacterium. In conclusion, the canonical bacterial cell division machinery is not essential in  P .  limnophila  and this bacterium divides via budding using an unknown mechanism.

Non-essentiality of canonical cell division genes in the planctomycete Planctopirus limnophila