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Significance For complex biological processes, the formation of protein complexes is a strategy for coordinating the activities of many enzymes in space and time. It has been hypothesized that growth of the bacterial cell wall involves stable synthetic complexes, but neither the existence of such complexes nor the consequences of such a mechanism for growth efficiency have been demonstrated. Here, we use single-molecule tracking to demonstrate that the association between an essential cell wall synthesis enzyme and the cytoskeleton is highly dynamic, which allows the cell to buffer growth rate against large fluctuations in enzyme abundance. This indicates that dynamic association can be an efficient strategy for coordination of multiple enzymes, especially those for which excess abundance can be harmful to cells.

A dynamically assembled cell wall synthesis machinery buffers cell growth