Dynamic allocation of MurJ coordinates bacterial growth and division

In Escherichia coli, higher nonseptal MurJ abundance shifts peptidoglycan synthesis toward elongation and away from septal growth, coordinating cell enlargement with division.

• Why it matters: Cells must balance lateral elongation and septal cytokinesis while sharing Lipid II, but how precursor allocation is spatially controlled—and whether MurJ transport matters—was unclear.
• What they did: The authors increased nonseptal MurJ levels and used single-molecule tracking to map MurJ behavior, testing whether recruitment depends on active septal synthesis versus ongoing Lipid II synthesis or flipping.
• The result: MurJ diffuses broadly yet is transiently captured at division sites, and this recruitment requires active septal cell-wall synthesis but not continued Lipid II synthesis or flipping, implying a capture-and-release allocation mechanism.

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