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Trigger factor is an abundant cytosolic protein of Escherichia coli which can stabilize proOmpA for in vitro translocation across inner membrane vesicles. The gene encoding E. coli trigger factor was isolated and sequenced, allowing construction of strains in which the expression of trigger factor is readily regulated. We found no defect in the in vivo rate of synthesis or secretion of proOmpA in trigger factor-depleted cells. The primary physiological defect in trigger factor-depleted or -overproducing cells is an enrichment of filamented cells. Filamentation of the trigger factor-overproducing strain is suppressed by a multicopy plasmid expressing the essential division gene ftsZ, suggesting that trigger factor has an important role in cell division.

Trigger factor depletion or overproduction causes defective cell division but does not block protein export