7LO7
NorA in complex with Fab25
Summary for 7LO7
| Entry DOI | 10.2210/pdb7lo7/pdb |
| EMDB information | 23463 |
| Descriptor | Quinolone resistance protein NorA, Fab25 Heavy Chain, Fab25 Light Chain (3 entities in total) |
| Functional Keywords | efflux pump, antibiotic resistance, transport protein |
| Biological source | Staphylococcus aureus More |
| Total number of polymer chains | 3 |
| Total formula weight | 96363.79 |
| Authors | Brawley, D.N.,Sauer, D.B.,Song, J.M.,Koide, A.,Koide, S.,Traaseth, N.J.,Wang, D.N. (deposition date: 2021-02-09, release date: 2022-04-20, Last modification date: 2025-05-28) |
| Primary citation | Brawley, D.N.,Sauer, D.B.,Li, J.,Zheng, X.,Koide, A.,Jedhe, G.S.,Suwatthee, T.,Song, J.,Liu, Z.,Arora, P.S.,Koide, S.,Torres, V.J.,Wang, D.N.,Traaseth, N.J. Structural basis for inhibition of the drug efflux pump NorA from Staphylococcus aureus. Nat.Chem.Biol., 18:706-712, 2022 Cited by PubMed Abstract: Membrane protein efflux pumps confer antibiotic resistance by extruding structurally distinct compounds and lowering their intracellular concentration. Yet, there are no clinically approved drugs to inhibit efflux pumps, which would potentiate the efficacy of existing antibiotics rendered ineffective by drug efflux. Here we identified synthetic antigen-binding fragments (Fabs) that inhibit the quinolone transporter NorA from methicillin-resistant Staphylococcus aureus (MRSA). Structures of two NorA-Fab complexes determined using cryo-electron microscopy reveal a Fab loop deeply inserted in the substrate-binding pocket of NorA. An arginine residue on this loop interacts with two neighboring aspartate and glutamate residues essential for NorA-mediated antibiotic resistance in MRSA. Peptide mimics of the Fab loop inhibit NorA with submicromolar potency and ablate MRSA growth in combination with the antibiotic norfloxacin. These findings establish a class of peptide inhibitors that block antibiotic efflux in MRSA by targeting indispensable residues in NorA without the need for membrane permeability. PubMed: 35361990DOI: 10.1038/s41589-022-00994-9 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.74 Å) |
Structure validation
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