Part:BBa_K733003

RBS+ydcD: antitoxin gene

ydcD has another name endB. This gene encodes a labile antidote –YdcD - for ydcE(ndoA) gene. YdcD can directly inhibit EndoA in vitro, so that the bacteria will not be vitiated under low level expression of YdcE. (Pellegrini et al., 2005) For reasons why we include this gene in our cell growth inhibition device, please click:BBa_K733012.

Characterization by UCAS iGEM 2016 team

This is we used the ydcD and ydcE genes to build a kill-switch. By measuring the growth curve of E. coli expressing the antitoxin and toxin, we showed that toxin EndoA can be effectively neutralized by its antitoxin EndoB. However, if the expression of EndoA is too strong (for example, induced by 5µg/mL aTc in our case), toxin will not be neutralized by antitoxin. We also characterized toxin ydcE, documented on the page: BBa_K733004

In the figure above, toxin is induced at 0 min by 1.7µg/mL aTc, and antitoxin is induced by 8mM of IPTG after incubation for 4 hours.

In the figure above, toxin and antitoxin are both induced at 0 min.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Reference

Pellegrini O, Mathy N, Gogos A, Shapiro L, and Condon C. "The Bacillus subtilis ydcDE operon encodes an endoribonuclease of the MazF/PemK family and its inhibitor.." Molecular microbiology. 56.5 (2005): 1139-1148. Print.