text: Yo, check it out, I'm 'bout to drop some knowledge,
  'Bout this protein called Spx, straight outta college.
  It's an ArsC member, part of the fam,
  A global regulator, yeah, that's who I am.
  
  In the stress response, this protein takes control,
  Gram-positive bacteria, it's highly conserved, yo.
  Bacillus subtilis got the Spx on lock,
  It interacts with RNA polymerase, that's alphaCTD, don't mock.
  
  Spx got the power to control transcription,
  Positive and negative, it's the boss in this mission.
  When thiol stress hits, it's time to activate,
  Thioredoxin and thioredoxin reductase, no time to wait.
  
  Up in the mix, Spx got a redox disulfide center,
  N-terminal C10XXC13, a true trendsetter.
  When it's active, that center gets oxidized,
  Spx in action, yo, it's highly prized.