Part:BBa_K817052

SP2

Modified P_CI

This is a modified promoter sequence of previous part, BBa_R0051, in which OR1 lying in -35 regions, and OR1 in -10 region. We put modified OR1 sequence in -35 region and OL1 in -10 region

As we sought to design a thermal sensitive composite part, we integrate our modified pCI promoter(modification of pCI, BBa_R0051) with temperature sensitive CI repressor, which is cloned from Harvard’s thermal regulation part, 2008. (BBa_K098988). We showed the modified promoter design had superior repression effects.

The circuit incorporates a temperature sensitive cI promoter(CIts) to sense the temperature upshift. In our test we use a thermal adjustable plate reader to detect the mRFP flurorescence. In the beginning, we keep the temperature under 30 Celsius degrees for over 1 hour, and then detect the emission of mRFP. As the dimerized CIts repressor in lower temperature would specifically bind and repress P_CI, and further hinder the expression of mRFP. We can expect the emission to be low under 610 nm wavelength. We then abruptly increase our temperature to 37 celsius degrees, as we expect the CIts dimer would decompose and lose the function of repressing mRFP expression.

The result showed a low level of mRFP expression under wavelength of 580 nm (excitation) and 610 nm (emission). After the sudden temperature upshift, the expression of mRFP steadily rises, and results in 5.7 folds increase in the 8th hour after the temperature upshift.

This proved the fact that repressor CIts and P_CI can largely lead to increase in protein expression, and can be used in our circuit design as it may turn on the circuit inside human body and spontaneously close down after the bacteria is expelled out.

We put our experience back to the related pages on wiki:

1. Modified part: [BBa_K098988:Experience]
2. Modified basic part: [BBa_R0051:Experience]

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]