Part:BBa_K3036004

Cold triggered kill switch

Kill switch consists of RNA thermometer (BBa_K115002), relE (BBa_K185000), and relB (BBa_K185048), aiming to prevent environmental contamination from the engineered bacteria through a cold-triggered toxin system. The toxin RelE shuts down protein synthesis and causes the death of microbe by cleaving mRNA within the ribosomal A site [1]. The antitoxin RelB counteracts RelE and thereby the inhibits cleavage of mRNA by RelE [2]. In addition, the RNA thermometer mediates expression at a temperature near 37℃ (body temperature), but not at 27℃ (room temperature).Only when the temperature reaches human body temperature can RelB be expressed. When the engineered bacteria get out of human body, temperature drops, inhibiting expression of the antitoxin RelB, and the bacteria die of the excessive toxin RelE, preventing contamination.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal XhoI site found at 161
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]