Part:BBa_K1031211

Pr-DmpR

For detailed information concerning DmpR, please visit 2013 Peking iGEM Biosensor DmpR

Characterization

Professor V.Shringler provided 2013 Peking iGEM Team with pVI401 composed of Pr-DmpR on vector pVI398, from which K1031211 is derived. K1031211 is composed of the natural promoter of DmpR, Pr and modified coding sequence with two Pst1 sites removed. To characterize DmpR, we constructed a biosensor circuit composed of Pr-DmpR and Po-sfGFP. (Fig 1)

Fig 1 Construction of biosensor circuit Po/DmpR. Orange arrowheads represent promoters. RBSs(Ribosome Binding Sites) are shown as green ovals.

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
COMPATIBLE WITH RFC[12]
21
INCOMPATIBLE WITH RFC[21]
Illegal BglII site found at 160
23
COMPATIBLE WITH RFC[23]
25
INCOMPATIBLE WITH RFC[25]
Illegal NgoMIV site found at 638
1000
INCOMPATIBLE WITH RFC[1000]
Illegal BsaI.rc site found at 323
Illegal BsaI.rc site found at 864
Illegal SapI.rc site found at 1521

Data shown

ON/OFF test

We evaluated the performance of DmpR using our own protocols and almost every protocol mentioned in the previous studies. Results showed that the Test Protocol 3 works the best, with which we tested the ON/OFF ratios of all the 78 aromatic compounds. 7 compounds out of the 78 showed significant induction ratios (>2),they are Phl, 2-MePhl, 2-ClPhl, 3-ClPhl, Cat, 4-NtPhl and 2-APhl (Fig 2)

Fig 2 Left Horizontal axis stands for different aromatic compounds.Vertical axis represents the ON/OFF induction ratio calculated from fluorescence intensity. Right Radar graph shows the aromatics-sensing profile of DmpR. The efficient and typical inducers are shown as their chemical structure.

Dose-Response curve

7 efficient aromatics at different concentration was induced to DmpR biosensor to plot dose-response curves for detailed information concerning DmpR.

Fig 3 Dose-response curves of DmpR biosensor induced by 7 strong inducers (phenol, as well as its homologs and derivatives). The induction ratio was calculated by dividing the fluorescence intensity of biosensor exposed to inducers by the basal fluorescence intensity of the biosensor.