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Significance The tropomyosin-like protein, DivIVA, determines the site of growth and cell morphology in mycobacteria. Surprisingly, although DivIVA is located at the tip of the growing cell pole, cell wall addition is excluded from this site. Both late cell wall synthetic enzymes and new cell wall deposition occur at a subpolar space, distinct from the DivIVA-marked cell tip. Instead of directly recruiting terminal cell wall synthetic systems, DivIVA interacts with enzymes involved in the early steps of the cell wall precursor synthesis. These results suggest a unique organization of the polar elongasome, where cell wall precursors are concentrated at the cell tip by DivIVA and then incorporated into the nascent cell wall in an annular pattern at the subpolar zone.

Subpolar addition of new cell wall is directed by DivIVA in mycobacteria