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TitleStructural basis for inhibition of the drug efflux pump NorA from Staphylococcus aureus.
Journal, issue, pagesNat Chem Biol, Vol. 18, Issue 7, Page 706-712, Year 2022
Publish dateMar 31, 2022
AuthorsDouglas N Brawley / David B Sauer / Jianping Li / Xuhui Zheng / Akiko Koide / Ganesh S Jedhe / Tiffany Suwatthee / Jinmei Song / Zheng Liu / Paramjit S Arora / Shohei Koide / Victor J Torres / Da-Neng Wang / Nathaniel J Traaseth /
PubMed AbstractMembrane protein efflux pumps confer antibiotic resistance by extruding structurally distinct compounds and lowering their intracellular concentration. Yet, there are no clinically approved drugs to ...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.
External linksNat Chem Biol / PubMed:35361990 / PubMed Central
MethodsEM (single particle)
Resolution3.16 - 3.74 Å
Structure data

23463

7lo7

EMDB-23463, PDB-7lo7:
NorA in complex with Fab25
Method: EM (single particle) / Resolution: 3.74 Å

23464

7lo8

EMDB-23464, PDB-7lo8:
NorA in complex with Fab36
Method: EM (single particle) / Resolution: 3.16 Å

Source
  • staphylococcus aureus (bacteria)
  • homo sapiens (human)
KeywordsTRANSPORT PROTEIN / efflux pump / antibiotic resistance

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