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Our proposed model of colicin N translocation. The receptor-binding domain of colicin N binds to OmpF (the affinity of which is modestly improved by LPS), the intrinsically disordered translocation domain threads through the lumen of a single OmpF barrel the TolA-binding site (TABS) binds to TolA to couple to PMF to energize import. The N-terminal OmpF-binding site (OBS) binds to the lumen of another OmpF barrel within the OmpF trimer.
