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To divide, most bacteria first construct a protein machine at the plane of division and then recruit the machinery that will synthesize the division septum. InEscherichia coli , this first stage involves the assembly of FtsZ polymers at midcell, which directly bind to membrane-associated proteins FtsA and ZipA to form a discontinuous ring structure. Although FtsZ directly binds both FtsA and ZipA, it is unclear why FtsZ requires two separate membrane tethers. Here, we uncover a new direct interaction between the tethers, which involves a helix within FtsA that is adjacent to its ATP binding pocket. Our findings imply that in addition to their known roles as FtsZ membrane anchors, FtsA and ZipA may regulate each other’s structure and function.

Direct Interaction between the Two Z Ring Membrane Anchors FtsA and ZipA