Mechanisms of resistance to each drug class

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6 Terms

1
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Penicillins (4)

  • Efflux pump

  • Modified penicillin-binding proteins

  • Beta-lactamase

  • Impaired outer membrane penetration (for G— bacteria)

2
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Cephalosporins (4)

  • Efflux pumps

  • Modified penicillin-binding proteins

  • Beta-lactamase (modified. Whatever that means)

  • Modified porins

3
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Macrolides (4)

  • Efflux pumps (mef gene)

  • Modified ribosomal 50S subunit (erm gene)

  • Enzymatic inactivation

  • Reduced permeability (for G— bacteria)

4
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Clindamycin (3)

  • Modified ribosomal 50S subunit (erm gene)

  • Enzymatic inactivation

  • Reduced permeability (for G— bacteria)

5
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Tetracyclines (2)

  • Efflux pumps (tetA gene)

  • Proteins that knock drug off ribosomal 30S subunit AND induce protein synthesis (tetM-t and tetW genes)

6
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Fluoroquinolones (3)

  • Modified DNA gyrase

  • Quinolone resistance proteins (Qnrs)

  • Efflux pumps (for G— and G+ bacteria)