Difference between revisions of "Part:BBa K1679018"

Revision as of 20:48, 17 September 2015

Promoter+RNA thermometer (PrfA) +mRFP

This is a device containing a promoter (BBa_J23109),a RNA thermometer (BBa_K115003),two terminators (BBa_B0015) and a RFP coding sequence (BBa_E0010) on the pSB1C3, which can be easily transformed into E.coli. RNA Thermometers(RNAT) are temperature-sensing RNA sequences in 5’UTR of their mRNAs. At low temperature, RNAT folds into structure, blocking access of ribosome; At high temperature, RNAT switch from off to open conformation, increasing the efficiency of translation initiation. When the temperature rises above 37°C, RFP would be expressed in theory.

Usage and Biology

TUDelft-2008 has modified 3 kinds of RNAT: ROSE(BBa_K115001), FourU(BBa_ K115002), PrfA(BBa_K115003). We constructed each RNAT under the control of 3 different constitutive promoters:BBa_J23101, BBa_J23106, BBa_J23119 and use RFP as a reporter. After construction, the 9 circuits were transformed into DH5α.

According to the results of TUDelft-2008, the temperature threshold is 37℃ for FourU and PfrA, 42℃ for ROSE. Thus, we set the culture temperature to 28℃, 37℃ and 42℃. For one temperature, we spotted one strain on 3 different plates, each plate contains 9 different strains. After 48 hours, as we can see in the photo: only FourU functioned, and FourU under the control of promoter J23119 worked best. Our K1679018 didn't show significant difference between 28℃ and 37℃ conditions.

Sequence and Features