SulA does not sequester FtsZ in Escherichia coli cells during the SOS response.

In Escherichia coli, the SulA protein is synthesized during the SOS response to arrest cell division. Two possible models of SulA action were proposed: the sequestration and the capping. In current paper, to clarify which model better reflects the SulA effect on cell division upon the SOS response, the FtsZ/SulA ratio was estimated inside cells based on fusion of both FtsZ and SulA to fluorescent protein mNeonGreen.