| TBDR | TonB-dependent receptor |
| NTLD | N-terminal luminal domain |
| CTβB | C-terminal β-barrel |
| OM | outer membrane |
| FeEnt | ferric enterobactin |
| Fc | ferrichrome |
| ColB | colicin B |
| ColM | colicin M |
| FM | fluorescein maleimide |
| PMF | proton motive force |
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