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Mode of Action

Strongly inhibits prokaryotic RNA polymerase and mammalian RNA polymerase to a lesser degree. Does not inhibit T7 RNA polymerase.

Mechanism of Resistance

Cells can spontaneously mutate to achieve resistance to Rifampicin.

Usage Notes

  1. 50 mg/mL stock solution in methanol.
  2. Vortex immediately to prevent rifampicin from sticking to bottom of tube.
  3. Add ~5 drops 10 N NaOH per mL to facilitate dissolving.
  4. Add 2 mL per liter of culture to achieve a working concentration of 100 μg/mL.

Rifampicin is light-sensitive so store stock solution, plates and media in the dark and wrap in foil.


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