Part:BBa_K4156114
pLldR-mRFP
pLldR-mRFP consists of the pLldR promoter ( BBa_K4156101 ) and a downstream RFP sequence. pLldR-mRFP was designed to test the performance of the pLldR promoter by detection of a red fluorescent signal.
Usage and Biology
In this BioBrick, we used the pLldR complex promoter to regulate the expression of the downstream mRFP and eventually introduced the rrnB T1 terminator. this design allowed the spatial and temporal intensity of gene expression under the pLldR promoter to be measured by the red fluorescent signal. We were thus able to verify the specific response of the pLldR promoter to lactate.
Characterization
In vitro characterization and data analysis of the reported strains
To improve signaling stability as well as accuracy, we added Amplifying genetic switches based on serine integrase (Bxb1,TP901) to the R reporter( BBa_K4156115 ) to construct the AR reporter. Fig 1 indicates lactate (plldR) induced AR reporter with homogenized fluorescence intensity (mRFP/Cell). Comparing Fig1, 2, it can be seen that the fluorescence intensity of the AR reporter decreased significantly at a lactate concentration of 0 mM, and its expression was more stable over time. The fluorescence intensity of the AR reporter was also greater at other concentrations of lactate induction, and the difference between the fluorescence intensity after lactate induction at each concentration was more pronounced. This result indicates that the addition of amplifying genetic switch enhances the reporter intensity and robustness of the lactate biosensor.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal XhoI site found at 1
- 23COMPATIBLE WITH RFC[23]
- 25INCOMPATIBLE WITH RFC[25]Illegal AgeI site found at 680
Illegal AgeI site found at 1908
Illegal AgeI site found at 2020 - 1000COMPATIBLE WITH RFC[1000]
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